Make scandir compile-time configurable

Signed-off-by: Laurent Bercot <ska@appnovation.com>

5 files changed, 57 insertions, 59 deletions

diff --git a/configure b/configure
index 3dac442..47b57b8 100755
--- a/configure
+++ b/configure
@@ -25,6 +25,7 @@ Fine tuning of the installation directories:
   --includedir=DIR              C header files [PREFIX/include]
   --skeldir=DIR                 script skeleton files [PREFIX/etc/s6-linux-init/skel]
   --tmpfsdir=DIR                assume the initial tmpfs will be mounted on DIR [/run]
+  --scandir=DIR                 use tmpfsdir/DIR as the s6-svscan directory [service]
 
  If no --prefix option is given, by default libdir (but not dynlibdir) will be
  /usr/lib/$package, and includedir will be /usr/include.
@@ -177,6 +178,7 @@ vpathd=''
 build=
 skeldir='$prefix/etc/s6-linux-init/skel'
 tmpfsdir=/run
+scandir=service
 utmps=false
 
 for arg ; do
@@ -212,6 +214,7 @@ for arg ; do
     --disable-nsss|--enable-nsss=no) usensss=false ;;
     --skeldir=*) skeldir=${arg#*=} ;;
     --tmpfsdir=*) tmpfsdir=${arg#*=} ;;
+    --scandir=*) scandir=${arg#*=} ;;
     --enable-utmps|--enable-utmps=yes) utmps=true ;;
     --disable-utmps|--enable-utmps=no) utmps=false ;;
     --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
@@ -525,6 +528,7 @@ fi
 echo "#define ${package_macro_name}_LIBEXECPREFIX \"$libexecdir/\""
 echo "#define ${package_macro_name}_SKELDIR \"$skeldir\""
 echo "#define ${package_macro_name}_TMPFS \"$tmpfsdir\""
+echo "#define ${package_macro_name}_SCANDIR \"$scandir\""
 echo
 if $utmps ; then
   echo "#define ${package_macro_name}_UTMPD_PATH \"$utmpd_path\""
diff --git a/src/include-local/initctl.h b/src/include-local/initctl.h
index a1be5c8..4e3df00 100644
--- a/src/include-local/initctl.h
+++ b/src/include-local/initctl.h
@@ -5,26 +5,26 @@
 
 #include <s6-linux-init/config.h>
 
-#define SCANDIR "service"
+#define SCANDIRFULL S6_LINUX_INIT_TMPFS "/" S6_LINUX_INIT_SCANDIR
 
 #define SHUTDOWND_SERVICEDIR "s6-linux-init-shutdownd"
 #define SHUTDOWND_FIFO "fifo"
-#define INITCTL S6_LINUX_INIT_TMPFS "/" SCANDIR "/" SHUTDOWND_SERVICEDIR "/" SHUTDOWND_FIFO
+#define INITCTL SCANDIRFULL "/" SHUTDOWND_SERVICEDIR "/" SHUTDOWND_FIFO
 
 #define RUNLEVELD_SERVICEDIR "s6-linux-init-runleveld"
 #define RUNLEVELD_SOCKET "s"
-#define RUNLEVELD_PATH S6_LINUX_INIT_TMPFS "/" SCANDIR "/" RUNLEVELD_SERVICEDIR "/" RUNLEVELD_SOCKET
+#define RUNLEVELD_PATH SCANDIRFULL "/" RUNLEVELD_SERVICEDIR "/" RUNLEVELD_SOCKET
 
 #define LOGOUTHOOKD_SERVICEDIR "s6-linux-init-logouthookd"
 #define LOGOUTHOOKD_SOCKET "s"
-#define LOGOUTHOOKD_PATH S6_LINUX_INIT_TMPFS "/" SCANDIR "/" LOGOUTHOOKD_SERVICEDIR "/" LOGOUTHOOKD_SOCKET
+#define LOGOUTHOOKD_PATH SCANDIRFULL "/" LOGOUTHOOKD_SERVICEDIR "/" LOGOUTHOOKD_SOCKET
 
 #define LOGGER_SERVICEDIR "s6-svscan-log"
 #define LOGGER_FIFO "fifo"
-#define LOGFIFO S6_LINUX_INIT_TMPFS "/" SCANDIR "/" LOGGER_SERVICEDIR "/" LOGGER_FIFO
+#define LOGFIFO SCANDIRFULL "/" LOGGER_SERVICEDIR "/" LOGGER_FIFO
 
 #define EARLYGETTY_SERVICEDIR "s6-linux-init-early-getty"
-#define EARLYGETTY S6_LINUX_INIT_TMPFS "/" SCANDIR "/" EARLYGETTY_SERVICEDIR
+#define EARLYGETTY SCANDIRFULL "/" EARLYGETTY_SERVICEDIR
 
 #define CONTAINER_RESULTS "s6-linux-init-container-results"
 
diff --git a/src/init/s6-linux-init-maker.c b/src/init/s6-linux-init-maker.c
index f17bc37..840695f 100644
--- a/src/init/s6-linux-init-maker.c
+++ b/src/init/s6-linux-init-maker.c
@@ -316,7 +316,7 @@ static void cleanup (char const *base)
   errno = e ;
 }
 
-static void auto_dir_internal (char const *base, char const *dir, uid_t uid, gid_t gid, unsigned int mode, int strict)
+static void auto_dir_internal (char const *base, char const *dir, uid_t uid, gid_t gid, unsigned int mode, unsigned int options)
 {
   size_t clen = strlen(base) ;
   size_t dlen = strlen(dir) ;
@@ -325,9 +325,21 @@ static void auto_dir_internal (char const *base, char const *dir, uid_t uid, gid
   fn[clen] = dlen ? '/' : 0 ;
   memcpy(fn + clen + 1, dir, dlen + 1) ;
 
+  if (options & 2)
+  {
+    for (size_t i = clen + 1 ; i < clen + 1 + dlen ; i++) if (fn[i] == '/')
+    {
+      fn[i] = 0 ;
+      if (mkdir(fn, 0755) < 0 && (errno != EEXIST || (options & 1))) goto err ;
+      fn[i] = '/' ;
+    }
+  }
+
+  if (options & 4) return ;
+
   if (mkdir(fn, mode) < 0)
   {
-    if (errno != EEXIST || strict) goto err ;
+    if (errno != EEXIST || (options & 1)) goto err ;
   }
   else
   {
@@ -500,21 +512,6 @@ static void getug (char const *base, char const *s, uid_t *uid, gid_t *gid)
 
 #ifdef S6_LINUX_INIT_UTMPD_PATH
 
-static inline void auto_basedir (char const *base, char const *dir, uid_t uid, gid_t gid, unsigned int mode)
-{
-  size_t n = strlen(dir) ;
-  char tmp[n + 1] ;
-  for (size_t i = 0 ; i < n ; i++)
-  {
-    if ((dir[i] == '/') && i)
-    {
-      tmp[i] = 0 ;
-      auto_dir_internal(base, tmp, uid, gid, mode, 0) ;
-    }
-    tmp[i] = dir[i] ;
-  }
-}
-
 static int utmpd_script (buffer *b, char const *aux)
 {
   size_t sabase = satmp.len ;
@@ -544,15 +541,15 @@ static int utmpd_script (buffer *b, char const *aux)
 
 static inline void make_utmps (char const *base)
 {
-  auto_dir(base, "run-image/" SCANDIR "/utmpd", 0, 0, 0755) ;
-  auto_file(base, "run-image/" SCANDIR "/utmpd/notification-fd", "3\n", 2) ;
-  auto_script(base, "run-image/" SCANDIR "/utmpd/run", &utmpd_script, 0) ;
+  auto_dir(base, "run-image/" S6_LINUX_INIT_SCANDIR "/utmpd", 0, 0, 0755) ;
+  auto_file(base, "run-image/" S6_LINUX_INIT_SCANDIR "/utmpd/notification-fd", "3\n", 2) ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/utmpd/run", &utmpd_script, 0) ;
   {
     uid_t uid ;
     gid_t gid ;
     getug(base, utmp_user, &uid, &gid) ;
     auto_dir(base, "run-image/" UTMPS_DIR, uid, gid, 0755) ;
-    auto_basedir(base, "run-image/" S6_LINUX_INIT_UTMPD_PATH, uid, gid, 0755) ;
+    auto_dir_internal(base, "run-image/" S6_LINUX_INIT_UTMPD_PATH, uid, gid, 0755, 6) ;
   }
 }
 
@@ -560,15 +557,13 @@ static inline void make_utmps (char const *base)
 
 static inline void make_image (char const *base)
 {
-  auto_dir(base, "run-image", 0, 0, 0755) ;
-  auto_dir(base, "run-image/" SCANDIR, 0, 0, 0755) ;
-  auto_dir(base, "run-image/" SCANDIR "/.s6-svscan", 0, 0, 0755) ;
-  auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGQUIT", &put_shebang_options, 0) ;
-  auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGINT", &sig_script, "-r") ;
-  auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGUSR1", &sig_script, "-p") ;
-  auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGUSR2", &sig_script, "-h") ;
-  auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGPWR", &sig_script, "-p") ;
-  auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGWINCH", &put_shebang_options, 0) ;
+  auto_dir_internal(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan", 0, 0, 0755, 3) ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGQUIT", &put_shebang_options, 0) ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGINT", &sig_script, "-r") ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGUSR1", &sig_script, "-p") ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGUSR2", &sig_script, "-h") ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGPWR", &sig_script, "-p") ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGWINCH", &put_shebang_options, 0) ;
 
   if (!nologger)
   {
@@ -576,45 +571,45 @@ static inline void make_image (char const *base)
     gid_t gid ;
     getug(base, log_user, &uid, &gid) ;
     auto_dir(base, "run-image/" UNCAUGHT_DIR, uid, gid, 02750) ;
-    auto_dir(base, "run-image/" SCANDIR "/" LOGGER_SERVICEDIR, 0, 0, 0755) ;
-    auto_fifo(base, "run-image/" SCANDIR "/" LOGGER_SERVICEDIR "/" LOGGER_FIFO) ;
-    auto_file(base, "run-image/" SCANDIR "/" LOGGER_SERVICEDIR "/notification-fd", "3\n", 2) ;
-    auto_script(base, "run-image/" SCANDIR "/" LOGGER_SERVICEDIR "/run", &s6_svscan_log_script, 0) ;
+    auto_dir(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" LOGGER_SERVICEDIR, 0, 0, 0755) ;
+    auto_fifo(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" LOGGER_SERVICEDIR "/" LOGGER_FIFO) ;
+    auto_file(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" LOGGER_SERVICEDIR "/notification-fd", "3\n", 2) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" LOGGER_SERVICEDIR "/run", &s6_svscan_log_script, 0) ;
   }
 
-  auto_dir(base, "run-image/" SCANDIR "/" SHUTDOWND_SERVICEDIR, 0, 0, 0755) ;
-  auto_fifo(base, "run-image/" SCANDIR "/" SHUTDOWND_SERVICEDIR "/" SHUTDOWND_FIFO) ;
-  auto_script(base, "run-image/" SCANDIR "/" SHUTDOWND_SERVICEDIR "/run", &shutdownd_script, 0) ;
+  auto_dir(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" SHUTDOWND_SERVICEDIR, 0, 0, 0755) ;
+  auto_fifo(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" SHUTDOWND_SERVICEDIR "/" SHUTDOWND_FIFO) ;
+  auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" SHUTDOWND_SERVICEDIR "/run", &shutdownd_script, 0) ;
 
   if (inns)
   {
-    auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGTERM", &sig_script, "-h") ;
-    auto_script(base, "run-image/" SCANDIR "/.s6-svscan/crash", &container_crash_script, 0) ;
-    auto_script(base, "run-image/" SCANDIR "/.s6-svscan/finish", &container_exit_script, 0) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGTERM", &sig_script, "-h") ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/crash", &container_crash_script, 0) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/finish", &container_exit_script, 0) ;
     auto_dir(base, "run-image/" CONTAINER_RESULTS, 0, 0, 0755) ;
     auto_file(base, "run-image/" CONTAINER_RESULTS "/exitcode", "0\n", 2) ;
   }
   else
   {
-    auto_script(base, "run-image/" SCANDIR "/.s6-svscan/SIGTERM", &put_shebang_options, 0) ;
-    auto_script(base, "run-image/" SCANDIR "/.s6-svscan/crash", &death_script, "crashed") ;
-    auto_script(base, "run-image/" SCANDIR "/.s6-svscan/finish", &death_script, "exited") ;
-    auto_dir(base, "run-image/" SCANDIR "/" RUNLEVELD_SERVICEDIR, 0, 0, 0755) ;
-    auto_file(base, "run-image/" SCANDIR "/" RUNLEVELD_SERVICEDIR "/notification-fd", "3\n", 2) ;
-    auto_script(base, "run-image/" SCANDIR "/" RUNLEVELD_SERVICEDIR "/run", &runleveld_script, 0) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/SIGTERM", &put_shebang_options, 0) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/crash", &death_script, "crashed") ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/.s6-svscan/finish", &death_script, "exited") ;
+    auto_dir(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" RUNLEVELD_SERVICEDIR, 0, 0, 0755) ;
+    auto_file(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" RUNLEVELD_SERVICEDIR "/notification-fd", "3\n", 2) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" RUNLEVELD_SERVICEDIR "/run", &runleveld_script, 0) ;
   }
 
   if (logouthookd)
   {
-    auto_dir(base, "run-image/" SCANDIR "/" LOGOUTHOOKD_SERVICEDIR, 0, 0, 0755) ;
-    auto_file(base, "run-image/" SCANDIR "/" LOGOUTHOOKD_SERVICEDIR "/notification-fd", "1\n", 2) ;
-    auto_script(base, "run-image/" SCANDIR "/" LOGOUTHOOKD_SERVICEDIR "/run", &logouthookd_script, 0) ;
+    auto_dir(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" LOGOUTHOOKD_SERVICEDIR, 0, 0, 0755) ;
+    auto_file(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" LOGOUTHOOKD_SERVICEDIR "/notification-fd", "1\n", 2) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" LOGOUTHOOKD_SERVICEDIR "/run", &logouthookd_script, 0) ;
   }
 
   if (early_getty)
   {
-    auto_dir(base, "run-image/" SCANDIR "/" EARLYGETTY_SERVICEDIR, 0, 0, 0755) ;
-    auto_script(base, "run-image/" SCANDIR "/" EARLYGETTY_SERVICEDIR "/run", &line_script, early_getty) ;
+    auto_dir(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" EARLYGETTY_SERVICEDIR, 0, 0, 0755) ;
+    auto_script(base, "run-image/" S6_LINUX_INIT_SCANDIR "/" EARLYGETTY_SERVICEDIR "/run", &line_script, early_getty) ;
   }
 
 #ifdef S6_LINUX_INIT_UTMPD_PATH
diff --git a/src/init/s6-linux-init.c b/src/init/s6-linux-init.c
index d0bb442..d9585d6 100644
--- a/src/init/s6-linux-init.c
+++ b/src/init/s6-linux-init.c
@@ -289,7 +289,7 @@ int main (int argc, char const **argv, char const *const *envp)
     char const *newenvp[2] = { 0, 0 } ;
     size_t pathlen = path ? strlen(path) : 0 ;
     char fmtfd[2 + UINT_FMT] = "-" ;
-    char const *newargv[5] = { S6_EXTBINPREFIX "s6-svscan", fmtfd, "--", S6_LINUX_INIT_TMPFS "/" SCANDIR, 0 } ;
+    char const *newargv[5] = { S6_EXTBINPREFIX "s6-svscan", fmtfd, "--", SCANDIRFULL, 0 } ;
     char pathvar[6 + pathlen] ;
     if (path)
     {
diff --git a/src/shutdown/s6-linux-init-shutdownd.c b/src/shutdown/s6-linux-init-shutdownd.c
index ddf5804..ed02721 100644
--- a/src/shutdown/s6-linux-init-shutdownd.c
+++ b/src/shutdown/s6-linux-init-shutdownd.c
@@ -36,7 +36,6 @@
 #include "hpr.h"
 
 #define STAGE4_FILE "stage 4"
-#define SCANDIRFULL S6_LINUX_INIT_TMPFS "/" SCANDIR
 #define SCANPREFIX SCANDIRFULL "/"
 #define SCANPREFIXLEN (sizeof(SCANPREFIX) - 1)
 #define DOTPREFIX ".s6-linux-init-shutdownd:"