Add GNU mcron, a `cron' implementation in Guile Scheme.

svn path=/nixpkgs/trunk/; revision=14870

pkgs/tools/system/mcron/install-vixie-programs.patch

@@ -0,0 +1,22 @@
+This patch allows us to install the Vixie-compatible binaries as
+non-root.
+
+--- mcron-1.0.4/makefile.in	2008-02-21 20:55:24.000000000 +0100
++++ mcron-1.0.4/makefile.in	2009-04-03 20:18:44.000000000 +0200
+@@ -872,15 +872,11 @@ mcron.c : main.scm crontab.scm makefile.
+ 	@rm -f mcron.escaped.scm > /dev/null 2>&1
+ 
+ install-exec-hook:
+-	@if [ "`id -u`" -eq "0" ]; then \
++	@if true; then \
+ 	   rm -f $(fpp)cron$(EXEEXT) > /dev/null 2>&1; \
+ 	   $(INSTALL) --mode='u=rwx' mcron$(EXEEXT) $(fpp)cron$(EXEEXT); \
+ 	   rm -f $(fpp)crontab$(EXEEXT) > /dev/null 2>&1; \
+ 	   $(INSTALL) --mode='u=rwxs,og=rx' mcron$(EXEEXT) $(fpp)crontab$(EXEEXT); \
+-	   ./mkinstalldirs -m 'u=rwx' /var/cron; \
+-	   ./mkinstalldirs -m 'u=rwx,og=rx' /var/run; \
+-	   ./mkinstalldirs -m 'u=rwx,og=rx' @GUILE_SITE@; \
+-	   ./mkinstalldirs -m 'u=rwx,og=rx' @GUILE_SITE@/mcron; \
+     else \
+        echo "+++ WARNING: NON-ROOT INSTALL: ONLY mcron WILL BE INSTALLED, NOT ANY OF THE VIXIE REPLACEMENT PROGRAMS"; \
+ 	fi