tmpfiles: refactor into separate executable

The tmpfiles.d spec has proven useful in systemd, enough so that some developers
are starting to ship tmpfiles.d configuration files with their software.
By splitting the tmpfiles functionality in finit out into a separate executable
we are providing a useful piece of software that package managers can hook into.

Author: aanderse

plugins/bootmisc.c

@@ -38,7 +38,6 @@
 #include "finit.h"
 #include "helpers.h"
 #include "plugin.h"
-#include "tmpfiles.h"
 #include "util.h"
 #include "utmp-api.h"
 
@@ -163,7 +162,7 @@ static void setup(void *arg)
 	kernel_links();
 
 	/* Create all system tmpfiles.d(5) */
-	tmpfilesd();
+	execl(_PATH_TMPFILES, _PATH_TMPFILES, NULL);
 
 	/* Set BOOT_TIME UTMP entry */
 	utmp_set_boot();

src/Makefile.am

@@ -8,7 +8,7 @@ AM_LDFLAGS         = -export-dynamic
 endif
 
 sbin_PROGRAMS        = finit initctl
-pkglibexec_PROGRAMS  = getty logit runparts
+pkglibexec_PROGRAMS  = getty logit runparts tmpfiles
 if SULOGIN
 pkglibexec_PROGRAMS += sulogin
 endif
@@ -43,6 +43,11 @@ sulogin_SOURCES      = sulogin.c
 sulogin_CFLAGS       = -W -Wall -Wextra -std=gnu99
 sulogin_LDADD        = -lcrypt
 
+tmpfiles_SOURCES     = tmpfiles.c
+tmpfiles_CFLAGS      = -W -Wall -Wextra -std=gnu99
+tmpfiles_CFLAGS     += $(lite_CFLAGS)
+tmpfiles_LDADD       = $(lite_LIBS)
+
 logit_SOURCES        = logit.c logrotate.c
 logit_CFLAGS         = -W -Wall -Wextra -Wno-unused-parameter -std=gnu99
 logit_CFLAGS        += $(lite_CFLAGS)
@@ -66,7 +71,6 @@ finit_SOURCES      = api.c	cgroup.c	cgroup.h	\
 		     sig.c	sig.h				\
 		     sm.c	sm.h				\
 		     svc.c	svc.h				\
-		     tmpfiles.c	tmpfiles.h			\
 		     tty.c	tty.h				\
 		     util.c	util.h				\
 		     utmp-api.c	utmp-api.h

src/finit.h

@@ -59,6 +59,7 @@
 #define _PATH_RUNPARTS          FINIT_EXECPATH_ "/runparts"
 #define _PATH_SULOGIN           FINIT_EXECPATH_ "/sulogin"
 #define _PATH_GETTY             FINIT_EXECPATH_ "/getty"
+#define _PATH_TMPFILES          FINIT_EXECPATH_ "/tmpfiles"
 
 #define CMD_SIZE                1024
 #define LINE_SIZE               1024

src/tmpfiles.c

@@ -23,10 +23,24 @@
 
 #include "config.h"		/* Generated by configure script */
 
+#include <dirent.h>
+#include <ftw.h>
+#include <glob.h>
+#include <libgen.h>
+#include <grp.h>
+#include <pwd.h>
 #include <sys/sysmacros.h>
-#include "finit.h"
+
+#include <stdlib.h>
+#include <string.h>
+#ifdef _LIBITE_LITE
+# include <libite/lite.h>
+#else
+# include <lite/lite.h>
+#endif
+
 #include "helpers.h"
-#include "tmpfiles.h"
+#include "log.h"
 #include "util.h"
 
 static int glob_do(const char *path, int (*cb)(const char *))
@@ -470,7 +484,7 @@ static void tmpfiles(char *line)
  * before that to have Finit specific ones sorted first, and
  * a configure prefix specific one after that for user needs.
  */
-void tmpfilesd(void)
+int main(int argc, char *argv[])
 {
 	/* in priority order */
 	char *dir[] = {