Make s6-linux-init a real init package.

 This means:
 - removing leaky options to s6-linux-init-maker. Default initial_path is
now always /usr/bin:/bin; the uid and gid of the catch-all logger (used
at boot time) can now be given numerically instead of relying on the
(run-time) user db mapping.
 - moving s6-halt, s6-poweroff and s6-reboot over here, from s6-linux-utils
 - clarifying on the documentation a bit.

8 files changed, 87 insertions, 24 deletions

diff --git a/src/init/deps-exe/s6-halt b/src/init/deps-exe/s6-halt
new file mode 100644
index 0000000..e7187fe
--- /dev/null
+++ b/src/init/deps-exe/s6-halt
@@ -0,0 +1 @@
+-lskarnet
diff --git a/src/init/deps-exe/s6-poweroff b/src/init/deps-exe/s6-poweroff
new file mode 100644
index 0000000..e7187fe
--- /dev/null
+++ b/src/init/deps-exe/s6-poweroff
@@ -0,0 +1 @@
+-lskarnet
diff --git a/src/init/deps-exe/s6-reboot b/src/init/deps-exe/s6-reboot
new file mode 100644
index 0000000..e7187fe
--- /dev/null
+++ b/src/init/deps-exe/s6-reboot
@@ -0,0 +1 @@
+-lskarnet
diff --git a/src/init/hpr.c b/src/init/hpr.c
new file mode 100644
index 0000000..0e1c27a
--- /dev/null
+++ b/src/init/hpr.c
@@ -0,0 +1,44 @@
+/* ISC license. */
+
+#include <unistd.h>
+#include <signal.h>
+#include <sys/reboot.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/sgetopt.h>
+
+#define USAGE PROGNAME " [ -h | -p | -r ] [ -f ]"
+
+int main (int argc, char const *const *argv)
+{
+  int what = WHATDEFAULT ;
+  int force = 0 ;
+  PROG = PROGNAME ;
+
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      register int opt = subgetopt_r(argc, argv, "hprf", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'h' : what = 1 ; break ;
+        case 'p' : what = 2 ; break ;
+        case 'r' : what = 3 ; break ;
+        case 'f' : force = 1 ; break ;
+        default : strerr_dieusage(100, USAGE) ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+
+  if (force)
+  {
+    sync() ;
+    reboot(what == 3 ? RB_AUTOBOOT : what == 2 ? RB_POWER_OFF : RB_HALT_SYSTEM) ;
+    strerr_diefu1sys(111, "reboot()") ;
+  }
+  else if (kill(1, what == 3 ? SIGINT : what == 2 ? SIGUSR1 : SIGUSR2) < 0)
+    strerr_diefu1sys(111, "signal process 1") ;
+  return 0 ;
+}
diff --git a/src/init/s6-halt.c b/src/init/s6-halt.c
new file mode 100644
index 0000000..d758030
--- /dev/null
+++ b/src/init/s6-halt.c
@@ -0,0 +1,7 @@
+/* ISC license. */
+
+#undef PROGNAME
+#define PROGNAME "s6-halt"
+#undef WHATDEFAULT
+#define WHATDEFAULT 1
+#include "hpr.c"
diff --git a/src/init/s6-linux-init-maker.c b/src/init/s6-linux-init-maker.c
index c37b67c..60c5353 100644
--- a/src/init/s6-linux-init-maker.c
+++ b/src/init/s6-linux-init-maker.c
@@ -4,8 +4,6 @@
 #include <sys/stat.h>
 #include <unistd.h>
 #include <errno.h>
-#include <pwd.h>
-#include <skalibs/config.h>
 #include <skalibs/uint64.h>
 #include <skalibs/uint.h>
 #include <skalibs/gidstuff.h>
@@ -13,12 +11,13 @@
 #include <skalibs/allreadwrite.h>
 #include <skalibs/buffer.h>
 #include <skalibs/strerr2.h>
+#include <skalibs/env.h>
 #include <skalibs/stralloc.h>
 #include <skalibs/djbunix.h>
 #include <skalibs/sgetopt.h>
 #include <skalibs/skamisc.h>
 
-#define USAGE "s6-linux-init-maker [ -c basedir ] [ -l tmpfsdir ] [ -b execline_bindir ] [ -u log_user ] [ -g early_getty_cmd ] [ -2 stage2_script ] [ -r ] [ -Z finish_script ] [ -3 stage3_script ] [ -p initial_path ] [ -m initial_umask ] [ -t timestamp_style ] [ -d dev_style ] [ -s env_store ] [ -e initial_envvar ... ] dir"
+#define USAGE "s6-linux-init-maker [ -c basedir ] [ -l tmpfsdir ] [ -b execline_bindir ] [ -u log_uid -g log_gid | -U ] [ -G early_getty_cmd ] [ -2 stage2_script ] [ -r ] [ -Z finish_script ] [ -3 stage3_script ] [ -p initial_path ] [ -m initial_umask ] [ -t timestamp_style ] [ -d dev_style ] [ -s env_store ] [ -e initial_envvar ... ] dir"
 #define dieusage() strerr_dieusage(100, USAGE)
 #define dienomem() strerr_diefu1sys(111, "stralloc_catb") ;
 
@@ -38,11 +37,11 @@ static char const *init_script = "/etc/rc.init" ;
 static char const *tini_script = "/etc/rc.tini" ;
 static char const *shutdown_script = "/etc/rc.shutdown" ;
 static char const *bindir = "/bin" ;
-static char const *initial_path = SKALIBS_DEFAULTPATH ;
+static char const *initial_path = "/usr/bin:/bin" ;
 static char const *env_store = 0 ;
 static char const *early_getty = 0 ;
-static uid_t uncaught_logs_uid ;
-static gid_t uncaught_logs_gid ;
+static uid_t uncaught_logs_uid = 0 ;
+static gid_t uncaught_logs_gid = 0 ;
 static unsigned int initial_umask = 022 ;
 static unsigned int timestamp_style = 1 ;
 static unsigned int slashdev_style = 2 ;
@@ -356,23 +355,32 @@ static inline void make_image (char const *base)
   auto_script(base, "init", &stage1_script) ;
 }
 
-int main (int argc, char const *const *argv)
+int main (int argc, char const *const *argv, char const *const *envp)
 {
-  char const *catchall_user = "nobody" ;
   PROG = "s6-linux-init-maker" ;
   {
     subgetopt_t l = SUBGETOPT_ZERO ;
     for (;;)
     {
-      register int opt = subgetopt_r(argc, argv, "c:l:b:u:g:2:rZ:3:p:m:t:d:s:e:", &l) ;
+      register int opt = subgetopt_r(argc, argv, "c:l:b:u:g:UG:2:rZ:3:p:m:t:d:s:e:", &l) ;
       if (opt == -1) break ;
       switch (opt)
       {
         case 'c' : robase = l.arg ; break ;
         case 'l' : slashrun = l.arg ; break ;
         case 'b' : bindir = l.arg ; break ;
-        case 'u' : catchall_user = l.arg ; break ;
-        case 'g' : early_getty = l.arg ; break ;
+        case 'u' : if (!uint0_scan(l.arg, &uncaught_logs_uid)) dieusage() ; break ;
+        case 'g' : if (!uint0_scan(l.arg, &uncaught_logs_gid)) dieusage() ; break ;
+        case 'U' :
+        {
+          char const *x = env_get2(envp, "UID") ;
+          if (!x) strerr_dienotset(100, "UID") ;
+          if (!uint0_scan(x, &uncaught_logs_uid)) strerr_dieinvalid(100, "UID") ;
+          x = env_get2(envp, "GID") ;
+          if (!x) strerr_dienotset(100, "GID") ;
+          if (!uint0_scan(x, &uncaught_logs_gid)) strerr_dieinvalid(100, "GID") ;
+        }
+        case 'G' : early_getty = l.arg ; break ;
         case '2' : init_script = l.arg ; break ;
         case 'r' : redirect_stage2 = 1 ; break ;
         case 'Z' : tini_script = l.arg ; break ;
@@ -407,19 +415,6 @@ int main (int argc, char const *const *argv)
   if (slashdev_style > 2)
     strerr_dief1x(100, "-d dev_style must be 0, 1 or 2") ;
 
-  {
-    struct passwd *pw = getpwnam(catchall_user) ;
-    if (!pw)
-    {
-      if (errno)
-        strerr_diefu2sys(111, "getpwnam for ", catchall_user) ;
-      else
-        strerr_dief3x(100, "getpwnam for ", catchall_user, ": no such user") ;
-    }
-    uncaught_logs_uid = pw->pw_uid ;
-    uncaught_logs_gid = pw->pw_gid ;
-  }
-
   if (mkdir(argv[0], 0755) < 0)
     strerr_diefu2sys(111, "mkdir ", argv[0]) ;
 
diff --git a/src/init/s6-poweroff.c b/src/init/s6-poweroff.c
new file mode 100644
index 0000000..f9f7747
--- /dev/null
+++ b/src/init/s6-poweroff.c
@@ -0,0 +1,7 @@
+/* ISC license. */
+
+#undef PROGNAME
+#define PROGNAME "s6-poweroff"
+#undef WHATDEFAULT
+#define WHATDEFAULT 2
+#include "hpr.c"
diff --git a/src/init/s6-reboot.c b/src/init/s6-reboot.c
new file mode 100644
index 0000000..0bf8785
--- /dev/null
+++ b/src/init/s6-reboot.c
@@ -0,0 +1,7 @@
+/* ISC license. */
+
+#undef PROGNAME
+#define PROGNAME "s6-reboot"
+#undef WHATDEFAULT
+#define WHATDEFAULT 3
+#include "hpr.c"