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Taken on board suggestions of Mathieu Lirzin as per e-mails to the bug-mcron@gnu.org mailing list around September 2015.

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This commit is contained in:
Dale Mellor 2015-10-22 06:59:21 +01:00
commit c0a6eb14c2
20 changed files with 1155 additions and 664 deletions
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13
.gitignore vendored
View file

@ -1,9 +1,20 @@
*~
*.o
*.go
.deps
INSTALL
aclocal.m4
autom4te.cache
/build-aux/compile
/build-aux/config.guess
/build-aux/config.sub
/build-aux/depcomp
/build-aux/install-sh
/build-aux/mdate-sh
/build-aux/missing
/build-aux/texinfo.tex
compile
config.cache
config.log
config.scm
config.status
@ -20,8 +31,6 @@ install-sh
makefile
makefile.in
/mcron
mcron.c
/mdate-sh
*.o
missing
texinfo.tex

5
AUTHORS
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@ -1,6 +1,6 @@
Authors of GNU mcron.
Copyright (C) 2003, 2005, 2006 Dale Mellor
Copyright (C) 2003, 2005, 2006, 2015 Dale Mellor
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
@ -16,3 +16,6 @@ The section of the manual which describes in detail the syntax for Vixie-style
configuration files is copied verbatim from Paul Vixie's own distribution,
on the understanding that this is permitted under his copyright notice,
which is reproduced in its entirety in this section of the manual.
Further contributions have been received from Sergey Poznyakoff and Mathieu
Lirzin, and incorporated where appropriate.

41
ChangeLog
View file

@ -1,3 +1,16 @@
2015-10-22 Dale Mellor <dale@rdmp.org>
Taken on board suggestions of Mathieu Lirzin. This is mostly
cosmetic code re-arranging and refresh for newer features of
guile, but also:
* Eliminate the hacked embedding of the main scheme unit into the
C source code.
* Compile all the guile modules before installation.
2015-07-01 Mathieu Lirzin <mthl@openmailbox.org>
* configure.ac: Fix package name and bug reports email address.
@ -10,7 +23,7 @@
* .gitignore: Ignore 'mcron' only in the top-level directory.
2014-05-25 Dale Mellor <dale_mellor@users.sourceforge.net>
2014-05-25 Dale Mellor <dale_mellor@users.sourceforge.net>
* Juggled build infrastructure so that we can make the minimal man
page in the proper autotools way.
@ -18,14 +31,14 @@
* configure.ac: version to 1.0.8.
2014-04-28 Dale Mellor <dale_mellor@users.sourceforge.net>
2014-04-28 Dale Mellor <dale_mellor@users.sourceforge.net>
* We now run against, and require, guile-2.0.
* configure.ac: version to 1.0.7.
2012-02-04 Dale Mellor <dale_mellor@users.sourceforge.net>
2012-02-04 Dale Mellor <dale_mellor@users.sourceforge.net>
* main.scm: added search for initial files in
$XDG_CONFIG_HOME/cron directory, defaulting to ~/.config/cron if
@ -34,7 +47,7 @@
standards).
2010-06-13 Dale Mellor <dale_mellor@users.sourceforge.net>
2010-06-13 Dale Mellor <dale_mellor@users.sourceforge.net>
* configure.ac: added --enable-no-vixie-clobber argument to
configure so that the root user can avoid overwriting a legacy
@ -47,7 +60,7 @@
former is not supplied with the latest automake (1.11).
2008-02-21 Dale Mellor <dale_mellor@users.sourceforge.net>
2008-02-21 Dale Mellor <dale_mellor@users.sourceforge.net>
* ALL FILES: Replaced version 2 GPL notices with version 3 ones.
@ -58,7 +71,7 @@
* configure.ac: Bumped version to 1.0.4.
2008-01-25 Dale Mellor <dale_mellor@users.sourceforge.net>
2008-01-25 Dale Mellor <dale_mellor@users.sourceforge.net>
* main.scm (command-type): Files which are listed on the command
line are assumed to be guile configurations if they do not end in
@ -76,7 +89,7 @@
* Version is currently at 1.0.3.
2005-09-02 Dale Mellor <dale_mellor@users.sourceforge.net>
2005-09-02 Dale Mellor <dale_mellor@users.sourceforge.net>
* makefile.am, mcron.c.template (main): Modified install-exec-hook
so that a proper installation of a Vixie-compatible cron only
@ -93,7 +106,7 @@
* Bumped version to 1.0.2.
2004-05-15 Dale Mellor <dale_mellor@users.sourceforge.net>
2004-05-15 Dale Mellor <dale_mellor@users.sourceforge.net>
* Modified all auxiliary files to reflect that the package is now
properly homed at www.gnu.org.
@ -101,7 +114,7 @@
* Bumped version to 1.0.1.
2003-12-11 Dale Mellor <dale_mellor@users.sourceforge.net>
2003-12-11 Dale Mellor <dale_mellor@users.sourceforge.net>
* Modified all auxiliary files to reflect that we are now a GNU
package.
@ -109,7 +122,7 @@
* Bumped version to 1.0.0.
2003-12-07 Dale Mellor <dale_mellor@users.sourceforge.net>
2003-12-07 Dale Mellor <dale_mellor@users.sourceforge.net>
* configure.ac: Added switches for files and directories used by
mcron: --spool-dir, --socket-file, --allow-file, --deny-file,
@ -118,14 +131,14 @@
manual).
2003-12-05 Dale Mellor <dale_mellor@users.sourceforge.net>
2003-12-05 Dale Mellor <dale_mellor@users.sourceforge.net>
* configure.ac: Added test for guile version >= 1.6.4.
* bumped version to 0.99.4.
2003-08-03 Dale Mellor <dale_mellor@users.sourceforge.net>
2003-08-03 Dale Mellor <dale_mellor@users.sourceforge.net>
* Third cut, fully functional, modular, production quality, still
needs testing...
@ -136,7 +149,7 @@
* Bumped version to 0.99.3.
2003-07-20 Dale Mellor <dale_mellor@users.sourceforge.net>
2003-07-20 Dale Mellor <dale_mellor@users.sourceforge.net>
* Second cut, now _really_ fully functional (100% Vixie
compatible), production quality code, still needs lots of testing
@ -154,7 +167,7 @@
* Bumped version to 0.99.2.
2003-06-28 Dale Mellor <dale_mellor@users.sourceforge.net>
2003-06-28 Dale Mellor <dale_mellor@users.sourceforge.net>
* First cut, fully functional, production quality code, just needs
testing...

9
TODO
View file

@ -1,5 +1,6 @@
GNU mcron --- TODO -*-text-*-
Copyright (C) 2015 Mathieu Lirzin
Copyright (C) 2003, 2005, 2006, 2014 Dale Mellor
Copying and distribution of this file, with or without modification,
@ -19,6 +20,14 @@ Maybe in the near future...
core or other users' files up. Then allow scheme code in the system
crontabs.
* Make mcron behavior not depend on the name used to invoke it, to conform
to GNU standards.
* Provide a test suite using SRFI-64 API.
<http://srfi.schemers.org/srfi-64/srfi-64.html>.
* Internationalize Mcron using GNU Gettext and ask the Translation
Project to handle the localization.
There are no plans to actually do the following any time soon...

25
configure.ac
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@ -2,8 +2,7 @@
# Process this file with autoconf to produce a configure script.
# Copyright (C) 2003, 2005, 2012, 2014 Dale Mellor
# Copyright (C) 2015 Mathieu Lirzin
# Copyright (C) 2003, 2005, 2012, 2014, 2015 Dale Mellor
#
# This file is part of GNU mcron.
#
@ -24,8 +23,13 @@
AC_PREREQ(2.61)
AC_INIT([GNU Mcron], [1.0.8], [bug-mcron@gnu.org])
AC_CONFIG_AUX_DIR([build-aux])
AM_INIT_AUTOMAKE
AM_INIT_AUTOMAKE([silent-rules])
# Enable silent rules by default.
AM_SILENT_RULES([yes])
guilemoduledir="${datarootdir}/guile/site/2.0"
AC_SUBST([guilemoduledir])
AC_MSG_CHECKING([whether debugging is requested])
AC_ARG_ENABLE(debug,
@ -45,12 +49,19 @@ AC_SUBST(CONFIG_DEBUG)
# We have no interest (hence a no-op), but Debian wants this.
AC_ARG_ENABLE(maintainer-mode)
AC_CANONICAL_HOST
AC_PROG_AWK
AC_PROG_EGREP
AM_PROG_CC_C_O
PKG_CHECK_MODULES(GUILE, guile-2.0)
PKG_CHECK_MODULES([GUILE], [guile-2.0 >= 2.0.7])
AC_PATH_PROG([GUILE], [guile])
# search guild
AC_PATH_PROG([GUILD], [guild])
if test "x$GUILD" = "x"; then
AC_MSG_ERROR(['guild' binary not found; please check your guile-2.x installation.])
fi
# Checks for programs.
@ -64,10 +75,6 @@ AC_CHECK_PROGS(HEAD, head)
if test "x$ac_cv_prog_HEAD" = "x"; then
AC_MSG_ERROR(head not found)
fi
AC_CHECK_PROGS(ED, ed)
if test "x$ac_cv_prog_ED" = "x"; then
AC_MSG_ERROR(ed not found)
fi
AC_CHECK_PROGS(WHICH, which)
if test "x$ac_cv_prog_WHICH" = "x"; then
AC_MSG_ERROR(which not found)

505
doc/fdl.texi Normal file
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@ -0,0 +1,505 @@
@c The GNU Free Documentation License.
@center Version 1.3, 3 November 2008
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and (2) were thus incorporated prior to November 1, 2008.
The operator of an MMC Site may republish an MMC contained in the site
under CC-BY-SA on the same site at any time before August 1, 2009,
provided the MMC is eligible for relicensing.
@end enumerate
@page
@heading ADDENDUM: How to use this License for your documents
To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and
license notices just after the title page:
@smallexample
@group
Copyright (C) @var{year} @var{your name}.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled ``GNU
Free Documentation License''.
@end group
@end smallexample
If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
replace the ``with@dots{}Texts.''@: line with this:
@smallexample
@group
with the Invariant Sections being @var{list their titles}, with
the Front-Cover Texts being @var{list}, and with the Back-Cover Texts
being @var{list}.
@end group
@end smallexample
If you have Invariant Sections without Cover Texts, or some other
combination of the three, merge those two alternatives to suit the
situation.
If your document contains nontrivial examples of program code, we
recommend releasing these examples in parallel under your choice of
free software license, such as the GNU General Public License,
to permit their use in free software.
@c Local Variables:
@c ispell-local-pdict: "ispell-dict"
@c End:

6
doc/mcron.texi
View file

@ -63,6 +63,7 @@ running jobs at scheduled times.
* Syntax:: All the possibilities for configuring cron jobs.
* Invoking:: What happens when you run the mcron command.
* Guile modules:: Incorporating mcron into another Guile program.
* GNU Free Documentation License:: The license of this manual.
* Index:: The complete index.
@detailmenu
@ -1329,6 +1330,11 @@ Once this module has been declared in a program, a crontab file can be
used to augment the current job list with a call to
@code{read-vixie-file}.
@node GNU Free Documentation License
@appendix GNU Free Documentation License
@include fdl.texi
@node Index, , Guile modules, Top
@unnumbered Index

33
makefile.am
View file

@ -1,6 +1,5 @@
## Makefile for the toplevel directory of mcron.
## Copyright (C) 2003 Dale Mellor
## Copyright (C) 2015 Mathieu Lirzin
## Copyright (C) 2003, 2015 Dale Mellor
##
# This file is part of GNU mcron.
#
@ -17,20 +16,13 @@
# You should have received a copy of the GNU General Public License along
# with GNU mcron. If not, see <http://www.gnu.org/licenses/>.
## Process this file with automake to produce Makefile.in
## Process this file with automake to produce makefile.in
SUBDIRS = scm/mcron .
ED = @ED@ # !!!! Are these needed?
CP = @CP@
MAINTAINERCLEANFILES = configure makefile makefile.in config.guess config.sub \
install-sh missing texinfo.tex INSTALL \
aclocal.m4 compile depcomp doc/mcron.1
CLEANFILES = mcron.c
EXTRA_DIST = makefile.ed mcron.c.template BUGS
EXTRA_DIST = BUGS
info_TEXINFOS = doc/mcron.texi
@ -42,14 +34,7 @@ mcron_LDADD = @GUILE_LIBS@
# The second option is so that we can execute the binary in the local directory,
# in turn so that we can do mcron --help during the build process.
mcron_CFLAGS = @GUILE_CFLAGS@ -DGUILE_LOAD_PATH=\"$(datadir):./scm:...\"
mcron.c : scm/mcron/main.scm scm/mcron/crontab.scm makefile.ed mcron.c.template
@echo 'Building mcron.c...'
@$(ED) < makefile.ed > /dev/null 2>&1
@rm -f mcron.escaped.scm > /dev/null 2>&1
mcron_CFLAGS = @GUILE_CFLAGS@ -DGUILE_LOAD_PATH=\"$(datadir):./scm:...\"
# Full program prefix.
fpp = $(DESTDIR)$(bindir)/@real_program_prefix@
@ -79,11 +64,15 @@ uninstall-hook:
# Not part of formal package building, but a rule for manual use to get the
# elemental man page. Will only work once the mcron program is installed.
$(dist_man_MANS): mcron.c
# elemental man page.
doc/mcron.1 : mcron
$(HELP2MAN) -n 'a program to run tasks at regular (or not) intervals' \
./mcron > $@
./mcron > doc/mcron.1
MAINTAINERCLEANFILES = configure makefile makefile.in config.guess config.sub \
install-sh missing texinfo.tex INSTALL \
aclocal.m4 compile depcomp doc/mcron.1
maintainer-clean-local:
rm -r build-aux

34
makefile.ed
View file

@ -1,34 +0,0 @@
# Copyright (C) 2003 Dale Mellor
#
# This file is part of GNU mcron.
#
# GNU mcron is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU mcron is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with GNU mcron. If not, see <http://www.gnu.org/licenses/>.
#
#
#
e scm/mcron/main.scm
/\(load "crontab.scm"\)/d
-1r scm/mcron/crontab.scm
%s/\\/\\\\/g
%s/"/\\"/g
%s/ *;;.*$/ /g
g/^ *$/d
%s/^/\"/
%s/$/\"/
w mcron.escaped.scm
e mcron.c.template
/GUILE_PROGRAM_GOES_HERE/d
-1r mcron.escaped.scm
w mcron.c
q

115
mcron.c Normal file
View file

@ -0,0 +1,115 @@
/* mcron.c -- Run the mcron program.
*
* Copyright (C) 2015 Mathieu Lirzin
* Copyright (C) 2003, 2014 Dale Mellor
*
* This file is part of GNU Mcron.
*
* GNU Mcron is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* GNU Mcron is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with GNU Mcron. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* This C code represents the thinnest possible wrapper around the Guile code
* which constitutes all the functionality of the mcron program. There are
* two plus one reasons why we need to do this, and one very unfortunate
* consequence.
*
* Firstly, SUID does not work on an executable script. In the end, it is
* the execution of the translator, in our case guile, which determines the
* effective user, and it is not wise to make the system guile installation
* SUID root!
*
* Secondly, executable scripts show up in ugly ways in listings of the
* system process table. Guile in particular, with its multi-line ``#! ...\
* \n -s ...!#'' idiosyncracies shows up in process listings in a way that
* is difficult to determine what program is actually running.
*
* A third reason for the C wrapper which might be mentioned is that a
* security-conscious system administrator can choose to only install a
* binary, thus removing the possibility of a user studying a guile script
* and working out ways of hacking it to his own ends, or worse still
* finding a way to modify it to his own ends.
*
* Unfortunately, running the guile script from inside a C program means
* that the sigaction function does not work. Instead, it is necessary to
* perform the signal processing in C.
*/
#include <libguile.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
/* Handle the signal and exit. All signals that mcron handles will produce
* the same behavior so we don't need to use the signal value in the
* implementation. */
static void
react_to_terminal_signal (int signal)
{
scm_c_eval_string ("(delete-run-file)");
exit (1);
}
/* Set up all the signal handlers as required by the cron personality. This
* is necessary to perform the signal processing in C because the sigaction
* function won't work when called from Guile; this function is called from
* the Guile universe. */
static SCM
set_cron_signals ()
{
static struct sigaction sa;
memset (&sa, 0, sizeof (sa));
sa.sa_handler = react_to_terminal_signal;
sigaction (SIGTERM, &sa, 0);
sigaction (SIGINT, &sa, 0);
sigaction (SIGQUIT, &sa, 0);
sigaction (SIGHUP, &sa, 0);
return SCM_BOOL_T;
}
/* Launch the Mcron Guile main program. */
static void
inner_main (void *closure, int argc, char **argv)
{
scm_set_current_module (scm_c_resolve_module ("mcron main"));
scm_c_define_gsubr ("c-set-cron-signals", 0, 0, 0, set_cron_signals);
scm_c_eval_string ("(main)");
}
/* The real main function. Does nothing but start up the guile subsystem. */
int
main (int argc, char **argv)
{
setenv ("GUILE_LOAD_PATH", GUILE_LOAD_PATH, 1);
scm_boot_guile (argc, argv, inner_main, 0);
return 0;
}

120
mcron.c.template
View file

@ -1,120 +0,0 @@
/* -*-c-*- */
/*
* Copyright (C) 2003, 2014 Dale Mellor
*
* This file is part of GNU mcron.
*
* GNU mcron is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* GNU mcron is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with GNU mcron. If not, see <http://www.gnu.org/licenses/>.
*/
/*
This C code represents the thinnest possible wrapper around the Guile code
which constitutes all the functionality of the mcron program. There are two
plus one reasons why we need to do this, and one very unfortunate
consequence.
Firstly, SUID does not work on an executable script. In the end, it is
the execution of the translator, in our case guile, which determines the
effective user, and it is not wise to make the system guile installation
SUID root!
Secondly, executable scripts show up in ugly ways in listings of the
system process table. Guile in particular, with its multi-line
#! ...\ \n -s ...!#
idiosyncracies shows up in process listings in a way that is difficult
to determine what program is actually running.
A third reason for the C wrapper which might be mentioned is that a
security-conscious system administrator can choose to only install a
binary, thus removing the possibility of a user studying a guile script
and working out ways of hacking it to his own ends, or worse still
finding a way to modify it to his own ends.
Unfortunately, running the guile script from inside a C program means
that the sigaction function does not work. Instead, it is necessary to
perform the signal processing in C.
The guile code itself is substituted for the GU1LE_PROGRAM_GOES_HERE (sic)
token by the makefile, which processes the scheme to make it look like one
big string.
*/
#include <string.h>
#include <signal.h>
#include <libguile.h>
/* This is a function designed to be installed as a signal handler, for signals
which are supposed to initiate shutdown of this program. It calls the scheme
procedure (see mcron.scm for details) to do all the work, and then exits. */
void
react_to_terminal_signal (int sig)
{
scm_c_eval_string ("(delete-run-file)");
exit (1);
}
/* This is a function designed to be callable from scheme, and sets up all the
signal handlers required by the cron personality. */
SCM
set_cron_signals ()
{
static struct sigaction sa;
memset (&sa, 0, sizeof (sa));
sa.sa_handler = react_to_terminal_signal;
sigaction (SIGTERM, &sa, 0);
sigaction (SIGINT, &sa, 0);
sigaction (SIGQUIT, &sa, 0);
sigaction (SIGHUP, &sa, 0);
return SCM_BOOL_T;
}
/* The effective main function (i.e. the one that actually does some work). We
register the function above with the guile system, and then execute the mcron
guile program. */
void
inner_main ()
{
scm_c_define_gsubr ("c-set-cron-signals", 0, 0, 0, set_cron_signals);
scm_c_eval_string (
GUILE_PROGRAM_GOES_HERE
);
}
/* The real main function. Does nothing but start up the guile subsystem. */
int
main (int argc, char **argv)
{
setenv ("GUILE_LOAD_PATH", GUILE_LOAD_PATH, 1);
scm_boot_guile (argc, argv, inner_main, 0);
return 0;
}

4
scm/mcron/config.scm.in
View file

@ -1,5 +1,6 @@
;; -*-scheme-*-
;; Copyright (C) 2015 Mathieu Lirzin
;; Copyright (C) 2003 Dale Mellor
;;
;; This file is part of GNU mcron.
@ -23,8 +24,11 @@
(define-module (mcron config))
(define-public config-debug @CONFIG_DEBUG@)
(define-public config-package-name "@PACKAGE_NAME@")
(define-public config-package-version "@PACKAGE_VERSION@")
(define-public config-package-string "@PACKAGE_STRING@")
(define-public config-package-bugreport "@PACKAGE_BUGREPORT@")
(define-public config-package-url "@PACKAGE_URL@")
(define-public config-sendmail "@SENDMAIL@")
(define-public config-spool-dir "@CONFIG_SPOOL_DIR@")

4
scm/mcron/crontab.scm
View file

@ -221,8 +221,8 @@
;; The user is being silly. The message here is identical to the one Vixie cron
;; used to put out, for total compatibility.
(else
(mcron-error 15 "usage error: file name must be specified for replace.")))
(else (mcron-error 15
"usage error: file name must be specified for replace.")))
)) ;; End of file-level let-scopes.

55
scm/mcron/environment.scm
View file

@ -1,4 +1,4 @@
;; Copyright (C) 2003 Dale Mellor
;; Copyright (C) 2003, 2015 Dale Mellor
;;
;; This file is part of GNU mcron.
;;
@ -31,42 +31,12 @@
(define-module (mcron environment)
#:use-module (srfi srfi-26)
#:export (modify-environment
clear-environment-mods
append-environment-mods
get-current-environment-mods-copy))
;; The env-alist is an association list of variable names and values. Variables
;; later in the list will take precedence over variables before. We return a
;; fixed-up version in which some variables are given specific default values
;; (which the user can override), and two variables which the user is not
;; allowed to control are added at the end of the list.
(define (impose-default-environment env-alist passwd-entry)
(append `(("HOME" . ,(passwd:dir passwd-entry))
("CWD" . ,(passwd:dir passwd-entry))
("SHELL" . ,(passwd:shell passwd-entry))
("TERM" . #f)
("TERMCAP" . #f))
env-alist
`(("LOGNAME" . ,(passwd:name passwd-entry))
("USER" . ,(passwd:name passwd-entry)))))
;; Modify the UNIX environment for the current process according to the given
;; association list of variables, with the default variable values imposed.
(define (modify-environment env-alist passwd-entry)
(for-each (lambda (variable)
(setenv (car variable) (cdr variable)))
(impose-default-environment env-alist passwd-entry)))
;; As we parse configuration files, we build up an alist of environment
@ -103,3 +73,24 @@
(set! current-environment-mods (append current-environment-mods
(list (cons name value))))
#t)
;; Modify the UNIX environment for the current process according to the given
;; association list of variables, with the default variable values imposed.
(define (modify-environment env-alist passwd-entry)
(for-each (lambda (a) (setenv (car a) (cdr a)))
(let ((home-dir (passwd:dir passwd-entry))
(user-name (passwd:name passwd-entry)))
(append
;; Default environment variables which can be overidden by ENV.
`(("HOME" . ,home-dir)
("CWD" . ,home-dir)
("SHELL" . ,(passwd:shell passwd-entry))
("TERM" . #f)
("TERMCAP" . #f))
env-alist
;; Environment variables with imposed values.
`(("LOGNAME" . ,user-name)
("USER" . ,user-name))))))

21
scm/mcron/job-specifier.scm
View file

@ -34,7 +34,7 @@
set-configuration-time
job
find-best-next)
#:use-module (mcron core)
#:use-module (mcron mcron-core)
#:use-module (mcron environment)
#:use-module (mcron vixie-time)
#:re-export (append-environment-mods))
@ -203,11 +203,16 @@
(define configuration-user (getpw (getuid)))
(define configuration-time (current-time))
(define (set-configuration-user user)
(set! configuration-user (if (or (string? user)
(integer? user))
(getpw user)
user)))
(define (set-configuration-time time) (set! configuration-time time))
@ -233,10 +238,9 @@
((list? action) (lambda () (primitive-eval action)))
((string? action) (lambda () (system action)))
(else
(throw 'mcron-error
2
"job: invalid second argument (action; should be lambda"
" function, string or list)"))))
(throw 'mcron-error 2
"job: invalid second argument (action; should be lambda "
"function, string or list)"))))
(time-proc
(cond ((procedure? time-proc) time-proc)
@ -244,10 +248,9 @@
((list? time-proc) (lambda (current-time)
(primitive-eval time-proc)))
(else
(throw 'mcron-error
3
"job: invalid first argument (next-time-function; should ")
"be function, string or list)")))
(throw 'mcron-error 3
"job: invalid first argument (next-time-function; "
"should be function, string or list)"))))
(displayable
(cond ((not (null? displayable)) (car displayable))
((procedure? action) "Lambda function")

653
scm/mcron/main.scm
View file

@ -1,4 +1,4 @@
;; Copyright (C) 2003, 2012 Dale Mellor
;; Copyright (C) 2003, 2012, 2015 Dale Mellor
;;
;; This file is part of GNU mcron.
;;
@ -16,34 +16,24 @@
;; with GNU mcron. If not, see <http://www.gnu.org/licenses/>.
;; This is the 'main' routine for the whole system; the top of this file is the
;; global entry point (after the minimal C wrapper, mcron.c.template); to all
;; intents and purposes the program is pure Guile and starts here.
;;
;; This file is built into mcron.c.template by the makefile, which stringifies
;; the whole lot, and escapes quotation marks and escape characters
;; accordingly. Bear this in mind when considering literal multi-line strings.
;;
;; (l0ad "crontab.scm") (sic) is inlined by the makefile. All other
;; functionality comes through modules in .../share/guile/site/mcron/*.scm.
(define-module (mcron main)
#:use-module (ice-9 getopt-long)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (mcron config)
#:use-module (mcron mcron-core)
#:use-module (mcron job-specifier)
#:use-module (mcron vixie-specification)
#:use-module (srfi srfi-2)
#:use-module (srfi srfi-26)
#:export (delete-run-file
main))
;; Pull in some constants set by the builder (via autoconf) at configuration
;; time. Turn debugging on if indicated.
(use-modules (mcron config))
(if config-debug (begin (debug-enable 'debug)
(debug-enable 'backtrace)))
;; To determine the name of the program, scan the first item of the command line
;; backwards for the first non-alphabetic character. This allows names like
;; in.cron to be accepted as an invocation of the cron command.
(use-modules (ice-9 regex) (ice-9 rdelim))
;; Extract the actual command name from \a command. This returns the last
;; part of \a command without any non-alphabetic characters. For example
;; "in.cron" and "./mcron" will return respectively "cron" and "mcron".
(define command-name (match:substring (regexp-exec (make-regexp "[[:alpha:]]*$")
(car (command-line)))))
@ -51,49 +41,49 @@
;; Code contributed by Sergey Poznyakoff. Print an error message (made up from
;; the parts of rest), and if the error is fatal (present and non-zero) then
;; exit to the system with this code.
;; the parts of \a rest), and if the \a exit-code error is fatal (present and
;; non-zero) then exit to the system with \a exit-code.
(define (mcron-error exit-code . rest)
(with-output-to-port (current-error-port)
(lambda ()
(for-each display (append (list command-name ": ") rest))
(for-each display
(cons* command-name ": " rest))
(newline)))
(if (and exit-code (not (eq? exit-code 0)))
(primitive-exit exit-code)))
(when (and exit-code
(not (eq? exit-code 0)))
(primitive-exit exit-code)))
;; Code contributed by Sergey Poznyakoff. Execute body. If an 'mcron-error
;; Code contributed by Sergey Poznyakoff and improved upon by Mathieu Lirzin
;; with newer guile features. Execute the expressions. If an 'mcron-error
;; exception occurs, print its diagnostics and exit with its error code.
(defmacro catch-mcron-error (. body)
`(catch 'mcron-error
(lambda ()
,@body)
(lambda (key exit-code . msg)
(apply mcron-error exit-code msg))))
(define-syntax-rule (catch-mcron-error exp ...)
(catch 'mcron-error
(lambda () exp ...)
(lambda (key exit-code . msg)
(apply mcron-error exit-code msg))))
;; We will be doing a lot of testing of the command name, so it makes sense to
;; perform the string comparisons once and for all here.
;; One of the symbols \c mcron, \c crond or \c crontab according to the means
;; of our invocation.
(define command-type (cond ((string=? command-name "mcron") 'mcron)
((or (string=? command-name "cron")
(string=? command-name "crond")) 'cron)
((string=? command-name "crontab") 'crontab)
(else
(mcron-error 12 "The command name is invalid."))))
(define command-type
(let ((command=? (cute string=? command-name <>)))
(cond ((command=? "mcron") 'mcron)
((or (command=? "cron") (command=? "crond")) 'cron)
((command=? "crontab") 'crontab)
(else (mcron-error 12 "The command name is invalid.")))))
;; There are a different set of options for the crontab personality compared to
;; all the others, with the --help and --version options common to all the
;; There are a different set of options for the crontab personality compared
;; to all the others, with the --help and --version options common to all the
;; personalities.
(use-modules (ice-9 getopt-long))
(define options
(catch
'misc-error
@ -120,79 +110,86 @@
'((version (single-char #\v) (value #f))
(help (single-char #\h) (value #f))))))
(lambda (key func fmt args . rest)
(mcron-error 1 (apply format (append (list #f fmt) args))))))
;; If the user asked for the version of this program, give it to him and get
;; out.
(if (option-ref options 'version #f)
(begin
(display (string-append "\n
" command-name " (" config-package-string ")\n
Written by Dale Mellor\n
\n
Copyright (C) 2003, 2006, 2014 Dale Mellor\n
This is free software; see the source for copying conditions. There is NO\n
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n
"))
(quit)))
(mcron-error 1 (apply format (cons* #f fmt args))))))
;; Likewise if the user requested the help text.
;; Display version information for \a command and quit.
(if (option-ref options 'help #f)
(begin
(display (string-append "
Usage: " (car (command-line))
(case command-type
(define* (show-version #:optional (command command-name))
(let* ((name config-package-name)
(short-name (cadr (string-split name #\space)))
(version config-package-version))
(simple-format #t "~a (~a) ~a
Copyright (C) 2015 Free Software Foundation, Inc.
((mcron)
" [OPTIONS] [FILES]\n
Run an mcron process according to the specifications in the FILES (`-' for\n
standard input), or use all the files in ~/.config/cron (or the \n
deprecated ~/.cron) with .guile or .vixie extensions.\n
\n
-v, --version Display version\n
-h, --help Display this help message\n
-sN, --schedule[=]N Display the next N jobs that will be run by mcron\n
-d, --daemon Immediately detach the program from the terminal\n
and run as a daemon process\n
-i, --stdin=(guile|vixie) Format of data passed as standard input or\n
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.\n"
command name version)
(quit)))
;; Display where to get help and send bug reports.
(define (show-package-information)
(simple-format #t "\nReport bugs to: ~a.
~a home page: <~a>
General help using GNU software: <http://www.gnu.org/gethelp/>\n"
config-package-bugreport
config-package-name
config-package-url))
;; Display usage information and quit.
(define (show-help)
(simple-format #t "Usage: ~a" command-name)
(display
(case command-type
((mcron)
" [OPTIONS] [FILES]
Run an mcron process according to the specifications in the FILES (`-' for
standard input), or use all the files in ~/.config/cron (or the
deprecated ~/.cron) with .guile or .vixie extensions.
-v, --version Display version
-h, --help Display this help message
-sN, --schedule[=]N Display the next N jobs that will be run by mcron
-d, --daemon Immediately detach the program from the terminal
and run as a daemon process
-i, --stdin=(guile|vixie) Format of data passed as standard input or
file arguments (default guile)")
((cron)
" [OPTIONS]
Unless an option is specified, run a cron daemon as a detached process,
reading all the information in the users' crontabs and in /etc/crontab.
((cron)
" [OPTIONS]\n
Unless an option is specified, run a cron daemon as a detached process, \n
reading all the information in the users' crontabs and in /etc/crontab.\n
\n
-v, --version Display version\n
-h, --help Display this help message\n
-sN, --schedule[=]N Display the next N jobs that will be run by cron\n
-n, --noetc Do not check /etc/crontab for updates (HIGHLY\n
-v, --version Display version
-h, --help Display this help message
-sN, --schedule[=]N Display the next N jobs that will be run by cron
-n, --noetc Do not check /etc/crontab for updates (HIGHLY
RECOMMENDED).")
((crontab)
(string-append " [-u user] file\n"
" " (car (command-line)) " [-u user] { -e | -l | -r }\n"
" (default operation is replace, per 1003.2)\n"
" -e (edit user's crontab)\n"
" -l (list user's crontab)\n"
" -r (delete user's crontab)\n"))
(else "rubbish"))
"\n\n
Report bugs to " config-package-bugreport ".\n
"))
(quit)))
((crontab)
" [-u user] file
crontab [-u user] { -e | -l | -r }
(default operation is replace, per 1003.2)
-e (edit user's crontab)
-l (list user's crontab)
-r (delete user's crontab)")
(else "\nrubbish")))
(newline)
(show-package-information)
(quit))
;; This is called from the C front-end whenever a terminal signal is
;; received. We remove the /var/run/cron.pid file so that crontab and other
;; invocations of cron don't get the wrong idea that a daemon is currently
;; running.
;; Remove the /var/run/cron.pid file so that crontab and other invocations of
;; cron don't get the wrong idea that a daemon is currently running. This
;; procedure is called from the C front-end whenever a terminal signal is
;; received.
(define (delete-run-file)
(catch #t (lambda () (delete-file config-pid-file)
@ -202,47 +199,7 @@ Report bugs to " config-package-bugreport ".\n
;; Setup the cron process, if appropriate. If there is already a
;; /var/run/cron.pid file, then we must assume a cron daemon is already running
;; and refuse to start another one.
;;
;; Otherwise, clear the MAILTO environment variable so that output from cron
;; jobs is sent to the various users (this may still be overridden in the
;; configuration files), and call the function in the C wrapper to set up
;; terminal signal responses to vector to the procedure above. The PID file will
;; be filled in properly later when we have forked our daemon process (but not
;; done if we are only viewing the schedules).
(if (eq? command-type 'cron)
(begin
(if (not (eqv? (getuid) 0))
(mcron-error 16
"This program must be run by the root user (and should "
"have been installed as such)."))
(if (access? config-pid-file F_OK)
(mcron-error 1
"A cron daemon is already running.\n"
" (If you are sure this is not true, remove the file\n"
" "
config-pid-file
".)"))
(if (not (option-ref options 'schedule #f))
(with-output-to-file config-pid-file noop))
(setenv "MAILTO" #f)
(c-set-cron-signals)))
;; Define the functions available to the configuration files. While we're here,
;; we'll get the core loaded as well.
(use-modules (mcron core)
(mcron job-specifier)
(mcron vixie-specification))
;; Procedure to slurp the standard input into a string.
;; Return standard input as a string.
(define (stdin->string)
(with-output-to-string (lambda () (do ((in (read-char) (read-char)))
@ -251,183 +208,83 @@ Report bugs to " config-package-bugreport ".\n
;; Now we have the procedures in place for dealing with the contents of
;; configuration files, the crontab personality is able to validate such
;; files. If the user requested the crontab personality, we load and run the
;; code here and then get out.
;; Return a thunk which process each file in \a directory with \a proc. The
;; \a directory must be a directory name. The \a proc argument must be a
;; procedure that takes one file name argument.
(if (eq? command-type 'crontab)
(begin
(load "crontab.scm")
(quit)))
(define (proc-in-directory directory proc)
(let ((dir (opendir directory)))
(do ((file-name (readdir dir) (readdir dir)))
((eof-object? file-name) (closedir dir))
(proc file-name))))
;; Code contributed by Sergey Poznyakoff. Determine if the given file is a
;; regular file or not.
;; Process \a file-name according its extension. When \a guile-syntax? is \c
;; TRUE, force guile syntax usage. If \a file-name format is not recognized,
;; it is silently ignored (this deals properly with most editors' backup
;; files, for instance).
(define (regular-file? file)
(catch 'system-error
(lambda ()
(eq? (stat:type (stat file)) 'regular))
(lambda (key call fmt args . rest)
(mcron-error 0 (apply format (append (list #f fmt) args)))
#f)))
(define process-user-file
(let ((guile-regexp (make-regexp "\\.gui(le)?$"))
(vixie-regexp (make-regexp "\\.vix(ie)?$")))
(lambda* (file-path #:optional assume-guile)
(cond ((string=? "-" file-path)
(if (string=? (option-ref options 'stdin "guile") "vixie")
(read-vixie-port (current-input-port))
(eval-string (stdin->string))))
((regexp-exec vixie-regexp file-path)
(read-vixie-file file-path))
((or assume-guile
(regexp-exec guile-regexp file-path))
(load file-path))))))
;; Procedure which processes any configuration file according to the
;; extension. If a file is not recognized, it is silently ignored (this deals
;; properly with most editors' backup files, for instance).
(define guile-file-regexp (make-regexp "\\.gui(le)?$"))
(define vixie-file-regexp (make-regexp "\\.vix(ie)?$"))
(define (process-user-file file-path . assume-guile)
(cond ((string=? file-path "-")
(if (string=? (option-ref options 'stdin "guile") "vixie")
(read-vixie-port (current-input-port))
(eval-string (stdin->string))))
((or (not (null? assume-guile))
(regexp-exec guile-file-regexp file-path))
(load file-path))
((regexp-exec vixie-file-regexp file-path)
(read-vixie-file file-path))))
;; Procedure to run through all the files in a user's ~/.cron and/or
;; $XDG_CONFIG_HOME/cron or ~/.config/cron directories (only happens under the
;; mcron personality).
;; Process files in $XDG_CONFIG_HOME/cron and/or ~/.cron directories (if
;; $XDG_CONFIG_HOME is not defined uses ~/.config/cron instead).
(define (process-files-in-user-directory)
(let ((errors 0)
(home-directory (passwd:dir (getpw (getuid)))))
(map (lambda (config-directory)
(catch #t
(lambda ()
(let ((directory (opendir config-directory)))
(do ((file-name (readdir directory) (readdir directory)))
((eof-object? file-name) (closedir directory))
(process-user-file (string-append config-directory
"/"
file-name)))))
(lambda (key . args)
(set! errors (1+ errors)))))
(list (string-append home-directory "/.cron")
(string-append (or (getenv "XDG_CONFIG_HOME")
(string-append home-directory "/.config"))
"/cron")))
(if (eq? 2 errors)
(mcron-error 13
"Cannot read files in your ~/.config/cron (or ~/.cron) "
"directory."))))
(map (lambda (dir)
(catch #t
(lambda ()
(proc-in-directory
dir
(lambda (file-name)
(process-user-file (string-append dir "/" file-name)))))
(lambda (key . args)
(set! errors (1+ errors)))))
(list (string-append home-directory "/.cron")
(string-append (or (getenv "XDG_CONFIG_HOME")
(string-append home-directory "/.config"))
"/cron")))
(when (eq? 2 errors)
(mcron-error 13
"Cannot read files in your ~/.config/cron (or ~/.cron) directory."))))
;; Procedure to check that a user name is in the passwd database (it may happen
;; that a user is removed after creating a crontab). If the user name is valid,
;; the full passwd entry for that user is returned to the caller.
(define (valid-user user-name)
(setpwent)
(do ((entry (getpw) (getpw)))
((or (not entry)
(string=? (passwd:name entry) user-name))
(endpwent)
entry)))
;; Procedure to process all the files in the crontab directory, making sure that
;; each file is for a legitimate user and setting the configuration-user to that
;; user. In this way, when the job procedure is run on behalf of the
;; configuration files, the jobs are registered with the system with the
;; appropriate user. Note that only the root user should be able to perform this
;; operation, but we leave it to the permissions on the /var/cron/tabs directory
;; to enforce this.
(use-modules (srfi srfi-2)) ;; For and-let*.
;; Process all the files in the crontab directory. When the job procedure is
;; run on behalf of the configuration files, the jobs are registered on the
;; system with the appropriate user. Only root should be able to perform this
;; operation. The permissions on the /var/cron/tabs directory enforce this.
(define (process-files-in-system-directory)
(catch #t
(lambda ()
(let ((directory (opendir config-spool-dir)))
(do ((file-name (readdir directory) (readdir directory)))
((eof-object? file-name))
(and-let* ((user (valid-user file-name)))
(set-configuration-user user) ;; / ?? !!!!
(catch-mcron-error
(read-vixie-file (string-append config-spool-dir
"/"
file-name)))))))
(lambda (key . args)
(mcron-error
4
"You do not have permission to access the system crontabs."))))
;; Having defined all the necessary procedures for scanning various sets of
;; files, we perform the actual configuration of the program depending on the
;; personality we are running as. If it is mcron, we either scan the files
;; passed on the command line, or else all the ones in the user's .config/cron
;; (or .cron) directory. If we are running under the cron personality, we read
;; the /var/cron/tabs directory and also the /etc/crontab file.
(case command-type
((mcron) (if (null? (option-ref options '() '()))
(process-files-in-user-directory)
(for-each (lambda (file-path)
(process-user-file file-path #t))
(option-ref options '() '()))))
((cron) (process-files-in-system-directory)
(use-system-job-list)
(catch-mcron-error
(read-vixie-file "/etc/crontab" parse-system-vixie-line))
(use-user-job-list)
(if (not (option-ref options 'noetc #f))
(begin
(display
"WARNING: cron will check for updates to /etc/crontab EVERY MINUTE. If you do\n
not use this file, or you are prepared to manually restart cron whenever you\n
make a change, then it is HIGHLY RECOMMENDED that you use the --noetc\n
option.\n")
(set-configuration-user "root")
(job '(- (next-minute-from (next-minute)) 6)
check-system-crontab
"/etc/crontab update checker.")))))
;; If the user has requested a schedule of jobs that will run, we provide the
;; information here and then get out.
;;
;; Start by determining the number of time points in the future that output is
;; required for. This may be provided on the command line as a parameter to the
;; --schedule option, or else we assume a default of 8. Finally, ensure that the
;; count is some positive integer.
(and-let* ((count (option-ref options 'schedule #f)))
(set! count (string->number count))
(display (get-schedule (if (<= count 0) 1 count)))
(quit))
;; If we are supposed to run as a daemon process (either a --daemon option has
;; been explicitly used, or we are running as cron or crond), detach from the
;; terminal now. If we are running as cron, we can now write the PID file.
(if (option-ref options 'daemon (eq? command-type 'cron))
(begin
(if (not (eqv? (primitive-fork) 0))
(quit))
(setsid)
(if (eq? command-type 'cron)
(with-output-to-file config-pid-file
(lambda () (display (getpid)) (newline))))))
(lambda ()
(proc-in-directory
config-spool-dir
(lambda (user-name)
(and-let* ((user (false-if-exception (getpwnam user-name))))
(set-configuration-user user)
(catch-mcron-error
(read-vixie-file
(string-append config-spool-dir "/" user-name)))))))
(lambda (key . args)
(mcron-error 4
"You do not have permission to access the system crontabs."))))
@ -436,32 +293,30 @@ option.\n")
;; inform the main wait-run-wait execution loop to listen for incoming messages
;; on this socket.
(define fd-list '())
(if (eq? command-type 'cron)
(catch #t
(lambda ()
(let ((socket (socket AF_UNIX SOCK_STREAM 0)))
(bind socket AF_UNIX config-socket-file)
(listen socket 5)
(set! fd-list (list socket))))
(lambda (key . args)
(delete-file config-pid-file)
(mcron-error 1
"Cannot bind to UNIX socket "
config-socket-file))))
(define (cron-file-descriptors)
(if (eq? command-type 'cron)
(catch #t
(lambda ()
(let ((socket (socket AF_UNIX SOCK_STREAM 0)))
(bind socket AF_UNIX config-socket-file)
(listen socket 5)
(list socket)))
(lambda (key . args)
(delete-file config-pid-file)
(mcron-error 1
"Cannot bind to UNIX socket " config-socket-file)))
'()))
;; This function is called whenever a message comes in on the above socket. We
;; read a user name from the socket, dealing with the "/etc/crontab" special
;; Read a user name from the socket, dealing with the /etc/crontab special
;; case, remove all the user's jobs from the job list, and then re-read the
;; user's updated file. In the special case we drop all the system jobs and
;; re-read the /etc/crontab file.
;; user's updated file. In the special case drop all the system jobs and
;; re-read the /etc/crontab file. This function should be called whenever a
;; message comes in on the above socket.
(define (process-update-request)
(let* ((socket (car (accept (car fd-list))))
(define (process-update-request fd-list)
(let* ((socket (car (accept (car fd-list))))
(user-name (read-line socket)))
(close socket)
(set-configuration-time (current-time))
@ -475,29 +330,123 @@ option.\n")
(let ((user (getpw user-name)))
(remove-user-jobs user)
(set-configuration-user user)
(read-vixie-file (string-append config-spool-dir "/" user-name)))))))
(read-vixie-file
(string-append config-spool-dir "/" user-name)))))))
;; Entry point.
;;
;; This is the 'main' routine for the whole system; this module is the global
;; entry point (after the minimal C wrapper); to all intents and purposes the
;; program is pure Guile and starts here.
;; Added by Sergey Poznyakoff. This no-op will collect zombie child processes
;; as soon as they die. This is a big improvement as previously they stayed
;; around the system until the next time mcron wakes to fire a new job off.
(define (main . args)
;; Added by Sergey Poznyakoff. This no-op will collect zombie child processes
;; as soon as they die. This is a big improvement as previously they stayed
;; around the system until the next time mcron wakes to fire a new job off.
(when config-debug
(debug-enable 'backtrace))
(when (option-ref options 'version #f)
(show-version))
(when (option-ref options 'help #f)
(show-help))
;; Setup the cron process, if appropriate. If there is already a
;; /var/run/cron.pid file, then we must assume a cron daemon is already
;; running and refuse to start another one.
;;
;; Otherwise, clear the MAILTO environment variable so that output from cron
;; jobs is sent to the various users (this may still be overridden in the
;; configuration files), and call the function in the C wrapper to set up
;; terminal signal responses to vector to the procedure above. The PID file
;; will be filled in properly later when we have forked our daemon process
;; (but not done if we are only viewing the schedules).
(when (eq? command-type 'cron)
(unless (eqv? (getuid) 0)
(mcron-error 16
"This program must be run by the root user (and should have been "
"installed as such)."))
(when (access? config-pid-file F_OK)
(mcron-error 1
"A cron daemon is already running.\n (If you are sure this is not"
" true, remove the file\n " config-pid-file ".)"))
(unless (option-ref options 'schedule #f)
(with-output-to-file config-pid-file noop))
(setenv "MAILTO" #f)
;; Mathieu Lirzin: At compile time, this yields a "possibly unbound
;; variable" warning, but this is OK since it is bound in the C wrapper.
(c-set-cron-signals))
;; Unfortunately it seems to interact badly with the select system call,
;; wreaking havoc...
;; Now we have the procedures in place for dealing with the contents of
;; configuration files, the crontab personality is able to validate such
;; files. If the user requested the crontab personality, we load and run the
;; code here and then get out.
(when (eq? command-type 'crontab)
(load "crontab.scm")
(quit))
;; (sigaction SIGCHLD (lambda (sig) noop) SA_RESTART)
;; Having defined all the necessary procedures for scanning various sets of
;; files, we perform the actual configuration of the program depending on
;; the personality we are running as. If it is mcron, we either scan the
;; files passed on the command line, or else all the ones in the user's
;; .config/cron (or .cron) directory. If we are running under the cron
;; personality, we read the /var/cron/tabs directory and also the
;; /etc/crontab file.
(case command-type
((mcron)
(if (null? (option-ref options '() '()))
(process-files-in-user-directory)
(for-each (lambda (file-path) (process-user-file file-path
'guile-syntax))
(option-ref options '() '()))))
((cron)
(process-files-in-system-directory)
(use-system-job-list)
(catch-mcron-error (read-vixie-file "/etc/crontab"
parse-system-vixie-line))
(use-user-job-list)
(unless (option-ref options 'noetc #f)
(display "\
WARNING: cron will check for updates to /etc/crontab EVERY MINUTE. If you do
not use this file, or you are prepared to manually restart cron whenever you
make a change, then it is HIGHLY RECOMMENDED that you use the --noetc
option.\n")
(set-configuration-user "root")
(job '(- (next-minute-from (next-minute)) 6)
check-system-crontab
"/etc/crontab update checker."))))
;; If the user has requested a schedule of jobs that will run, we provide
;; the information here and then get out. Start by determining the number
;; of time points in the future that output is required for. This may be
;; provided on the command line as a parameter to the --schedule option, or
;; else we assume a default of 8. Finally, ensure that the count is some
;; positive integer.
(and-let* ((count (option-ref options 'schedule #f)))
(set! count (string->number count))
(display (get-schedule (max 1 count)))
(quit))
;; Now the main loop. Forever execute the run-job-loop procedure in the mcron
;; core, and when it drops out (can only be because a message has come in on the
;; socket) we process the socket request before restarting the loop again.
;; Sergey Poznyakoff: we can also drop out of run-job-loop because of a SIGCHLD,
;; so must test fd-list.
(catch-mcron-error
(while #t
(run-job-loop fd-list)
(if (not (null? fd-list))
(process-update-request))))
;; If we are supposed to run as a daemon process (either a --daemon option
;; has been explicitly used, or we are running as cron or crond), detach
;; from the terminal now. If we are running as cron, we can now write the
;; PID file.
(when (option-ref options 'daemon (eq? command-type 'cron))
(unless (eqv? (primitive-fork) 0)
(quit))
(setsid)
(when (eq? command-type 'cron)
(with-output-to-file config-pid-file
(lambda () (display (getpid)) (newline)))))
;; Now the main loop. Forever execute the run-job-loop procedure in the
;; mcron core, and when it drops out (can only be because a message has come
;; in on the socket) we process the socket request before restarting the
;; loop again. Sergey Poznyakoff: we can also drop out of run-job-loop
;; because of a SIGCHLD, so must test fd-list.
(catch-mcron-error
(let ((fd-list (cron-file-descriptors)))
(while #t
(run-job-loop fd-list)
(unless (null? fd-list)
(process-update-request fd-list))))))

65
scm/mcron/makefile.am
View file

@ -1,15 +1,60 @@
EXTRA_DIST = main.scm mcron-core.scm vixie-specification.scm \
crontab.scm environment.scm job-specifier.scm redirect.scm \
vixie-time.scm
## Makefile for the scm/mcron directory of mcron.
pkgdata_DATA = core.scm environment.scm job-specifier.scm redirect.scm \
vixie-time.scm vixie-specification.scm config.scm
# Copyright (C) 2015 Mathieu Lirzin
#
# This file is part of GNU mcron.
#
# GNU mcron is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# GNU mcron is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU mcron. If not, see <http://www.gnu.org/licenses/>.
## Process this file with automake to produce makefile.in.
# If you're wondering, the configure script keeps deleting all files with a name
# like core.*, so we have to keep re-making it (I lost a good day's work because
# of this).
MODULES = environment.scm \
job-specifier.scm \
main.scm \
mcron-core.scm \
redirect.scm \
vixie-specification.scm \
vixie-time.scm
core.scm : mcron-core.scm
$(CP) mcron-core.scm core.scm
GOBJECTS = $(MODULES:%.scm=%.go) config.go
nobase_dist_guilemodule_DATA = $(MODULES) crontab.scm
nobase_nodist_guilemodule_DATA = $(GOBJECTS) config.scm
CLEANFILES = $(GOBJECTS)
AM_V_GUILEC = $(AM_V_GUILEC_$(V))
AM_V_GUILEC_ = $(AM_V_GUILEC_$(AM_DEFAULT_VERBOSITY))
AM_V_GUILEC_0 = @echo " GUILEC" $@;
# Unset 'GUILE_LOAD_COMPILED_PATH' altogether while compiling. Otherwise, if
# $GUILE_LOAD_COMPILED_PATH contains $(moduledir), we may find .go files in
# there that are newer than the local .scm files (for instance because the
# user ran 'make install' recently). When that happens, we end up loading
# those previously-installed .go files, which may be stale, thereby breaking
# the whole thing.
#
# XXX: Use the C locale for when Guile lacks
# <http://git.sv.gnu.org/cgit/guile.git/commit/?h=stable-2.0&id=e2c6bf3866d1186c60bacfbd4fe5037087ee5e3f>.
.scm.go:
$(AM_V_GUILEC)$(MKDIR_P) `dirname "$@"` ; \
unset GUILE_LOAD_COMPILED_PATH ; \
LC_ALL=C \
$(GUILD) compile \
-L "$(top_builddir)/scm" -L "$(top_srcdir)/scm" \
-Wformat -Wunbound-variable -Warity-mismatch \
--target="$(host)" \
-o "$@" "$<"
SUFFIXES = .go

96
scm/mcron/mcron-core.scm
View file

@ -1,4 +1,4 @@
;; Copyright (C) 2003 Dale Mellor
;; Copyright (C) 2003, 2015 Dale Mellor
;;
;; This file is part of GNU mcron.
;;
@ -17,8 +17,9 @@
(define-module (mcron core)
(define-module (mcron mcron-core)
#:use-module (mcron environment)
#:use-module (srfi srfi-9)
#:export (add-job
remove-user-jobs
get-schedule
@ -38,7 +39,7 @@
;; The list of all jobs known to the system. Each element of the list is
;;
;; (vector user next-time-function action environment displayable next-time)
;; (make-job user next-time-function action environment displayable next-time)
;;
;; where action must be a procedure, and the environment is an alist of
;; modifications that need making to the UNIX environment before the action is
@ -60,18 +61,17 @@
(define (use-system-job-list) (set! configuration-source 'system))
(define (use-user-job-list) (set! configuration-source 'user))
;; Convenience functions for getting and setting the elements of a job object.
(define (job:user job) (vector-ref job 0))
(define (job:next-time-function job) (vector-ref job 1))
(define (job:action job) (vector-ref job 2))
(define (job:environment job) (vector-ref job 3))
(define (job:displayable job) (vector-ref job 4))
(define (job:next-time job) (vector-ref job 5))
;; A cron job.
(define-record-type <job>
(make-job user time-proc action environment displayable next-time)
job?
(user job:user) ;string : user passwd entry
(time-proc job:next-time-function) ;proc : with one 'time' parameter
(action job:action) ;thunk : user's code
(environment job:environment) ;alist : environment variables
(displayable job:displayable) ;string : visible in schedule
(next-time job:next-time ;number : time in UNIX format
job:next-time-set!))
;; Remove jobs from the user-job-list belonging to this user.
@ -97,12 +97,12 @@
(define (add-job time-proc action displayable configuration-time
configuration-user)
(let ((entry (vector configuration-user
time-proc
action
(get-current-environment-mods-copy)
displayable
(time-proc configuration-time))))
(let ((entry (make-job configuration-user
time-proc
action
(get-current-environment-mods-copy)
displayable
(time-proc configuration-time))))
(if (eq? configuration-source 'user)
(set! user-job-list (cons entry user-job-list))
(set! system-job-list (cons entry system-job-list)))))
@ -165,18 +165,17 @@
(lambda ()
(do ((count count (- count 1)))
((eqv? count 0))
(and-let* ((next-jobs (find-next-jobs))
(time (car next-jobs))
(date-string (strftime "%c %z\n" (localtime time))))
(for-each (lambda (job)
(display date-string)
(display (job:displayable job))
(newline)(newline)
(vector-set! job
5
((job:next-time-function job)
(job:next-time job))))
(cdr next-jobs)))))))
(and-let*
((next-jobs (find-next-jobs))
(time (car next-jobs))
(date-string (strftime "%c %z\n" (localtime time))))
(for-each (lambda (job)
(display date-string)
(display (job:displayable job))
(newline)(newline)
(job:next-time-set! job ((job:next-time-function job)
(job:next-time job))))
(cdr next-jobs)))))))
@ -195,22 +194,21 @@
;; to run.
(define (run-jobs jobs-list)
(for-each (lambda (job)
(if (eqv? (primitive-fork) 0)
(begin
(setgid (passwd:gid (job:user job)))
(setuid (passwd:uid (job:user job)))
(chdir (passwd:dir (job:user job)))
(modify-environment (job:environment job) (job:user job))
((job:action job))
(primitive-exit 0))
(begin
(set! number-children (+ number-children 1))
(vector-set! job
5
((job:next-time-function job)
(current-time))))))
jobs-list))
(for-each
(lambda (job)
(if (eqv? (primitive-fork) 0)
(begin
(setgid (passwd:gid (job:user job)))
(setuid (passwd:uid (job:user job)))
(chdir (passwd:dir (job:user job)))
(modify-environment (job:environment job) (job:user job))
((job:action job))
(primitive-exit 0))
(begin
(set! number-children (+ number-children 1))
(job:next-time-set! job ((job:next-time-function job)
(current-time))))))
jobs-list))

1
scm/mcron/redirect.scm
View file

@ -31,6 +31,7 @@
(define-module (mcron redirect)
#:export (with-mail-out)
#:use-module (ice-9 regex)
#:use-module ((mcron config) :select (config-sendmail))
#:use-module (mcron vixie-time))

14
scm/mcron/vixie-specification.scm
View file

@ -30,7 +30,7 @@
read-vixie-file
check-system-crontab)
#:use-module ((mcron config) :select (config-socket-file))
#:use-module (mcron core)
#:use-module (mcron mcron-core)
#:use-module (mcron job-specifier)
#:use-module (mcron redirect)
#:use-module (mcron vixie-time))
@ -162,13 +162,11 @@
(parse-vixie-environment line)
(parse-vixie-line line)))
(lambda (key exit-code . msg)
(throw
'mcron-error
exit-code
(apply string-append
(number->string report-line)
": "
msg)))))))))
(throw 'mcron-error exit-code
(apply string-append
(number->string report-line)
": "
msg)))))))))