From 54b6467013bfbdb3ee606961c02fbff1271ca582 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Fri, 19 Sep 2014 15:01:58 +0000
Subject: initial commit

---
 src/minutils/s6-mount.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 src/minutils/s6-mount.c

(limited to 'src/minutils/s6-mount.c')

diff --git a/src/minutils/s6-mount.c b/src/minutils/s6-mount.c
new file mode 100644
index 0000000..6970c05
--- /dev/null
+++ b/src/minutils/s6-mount.c
@@ -0,0 +1,126 @@
+/* ISC license. */
+
+#include <sys/mount.h>
+#include <mntent.h>
+#include <stdio.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+#include "mount-constants.h"
+
+#define USAGE "s6-mount -a [ -z fstab ] | s6-mount [ -t type ] [ -o option[,option...] ]... device mountpoint"
+#define BUFSIZE 4096
+
+#define SWITCH(opt) do
+#define HCTIWS(opt) while(0) ;
+#define CASE(s) if (!str_diffn(opt, (s), str_len(s)))
+
+static void scanopt (stralloc *data, unsigned long *flags, char const *opt)
+{
+  for (;;)
+  {
+    register unsigned int n = str_chr(opt, ',') ;
+
+    SWITCH(opt)
+    {
+      CASE("defaults") { *flags = MS_MGC_VAL ; break ; }
+      CASE("ro") { *flags |= MS_RDONLY ; break ; }
+      CASE("rw") { *flags &= ~MS_RDONLY ; break ; }
+      CASE("remount") { *flags |= MS_REMOUNT ; break ; }
+      CASE("sync") { *flags |= MS_SYNCHRONOUS ; break ; }
+      CASE("async") { *flags &= ~MS_SYNCHRONOUS ; break ; }
+      CASE("nodev") { *flags |= MS_NODEV ; break ; }
+      CASE("dev") { *flags &= ~MS_NODEV ; break ; }
+      CASE("noexec") { *flags |= MS_NOEXEC ; break ; }
+      CASE("exec") { *flags &= ~MS_NOEXEC ; break ; }
+      CASE("nosuid") { *flags |= MS_NOSUID ; break ; }
+      CASE("suid") { *flags &= ~MS_NOSUID ; break ; }
+      CASE("noatime") { *flags |= MS_NOATIME ; break ; }
+      CASE("atime") { *flags &= ~MS_NOATIME ; break ; }
+      CASE("nodiratime") { *flags |= MS_NODIRATIME ; break ; }
+      CASE("diratime") { *flags &= ~MS_NODIRATIME ; break ; }
+      CASE("bind") { *flags |= MS_BIND ; break ; }
+      CASE("nobind") { *flags &= ~MS_BIND ; break ; }
+      CASE("move") { *flags |= MS_MOVE ; break ; }
+      CASE("nomove") { *flags &= ~MS_MOVE ; break ; }
+
+        if ((data->s && data->len && !stralloc_catb(data, ",", 1)) || !stralloc_catb(data, opt, n))
+          strerr_diefu1sys(111, "build data string") ;
+    }
+    HCTIWS(opt)
+
+    opt += n ;
+    if (!*opt) break ;
+    if (*opt != ',') strerr_dief1x(100, "unrecognized option") ;
+    opt++ ;
+  }
+}
+
+static int mountall (char const *fstab)
+{
+  struct mntent *d ;
+  int e = 0 ;
+  FILE *yuck = setmntent(fstab, "r") ;
+  if (!yuck) strerr_diefu2sys(111, "open ", fstab) ;
+  while ((d = getmntent(yuck)))
+  {
+    unsigned long flags = MS_MGC_VAL ;
+    stralloc data = STRALLOC_ZERO ;
+    scanopt(&data, &flags, d->mnt_opts) ;
+    if (!stralloc_0(&data))
+      strerr_diefu1sys(111, "build data string") ;
+#ifdef DEBUG
+    strerr_warni4x("mounting ", d->mnt_fsname, " on ", d->mnt_dir) ;
+#endif
+    if (mount(d->mnt_fsname, d->mnt_dir, d->mnt_type, flags, data.s) == -1)
+    {
+      e++ ;
+      strerr_warnwu4sys("mount ", d->mnt_fsname, " on ", d->mnt_dir) ;
+    }
+    stralloc_free(&data) ;
+  }
+  endmntent(yuck) ;
+  return e ;
+}
+
+int main (int argc, char const *const *argv)
+{
+  stralloc data = STRALLOC_ZERO ;
+  unsigned long flags = MS_MGC_VAL ;
+  char const *fstype = "none" ;
+  char const *fstab = "/etc/fstab" ;
+  PROG = "s6-mount" ;
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      register int opt = subgetopt_r(argc, argv, "z:arwt:o:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'z' : fstab = l.arg ; break ;
+        case 'a' : return mountall(fstab) ;
+        case 't' : fstype = l.arg ; break ;
+        case 'w' : scanopt(&data, &flags, "rw") ; break ;
+        case 'r' : scanopt(&data, &flags, "ro") ; break ;
+        case 'o' : scanopt(&data, &flags, l.arg) ; break ;
+        default : strerr_dieusage(100, USAGE) ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+  if (!argc)
+  {
+    int fd = open_readb("/proc/mounts") ;
+    if (fd < 0) strerr_diefu2sys(111, "read ", "/proc/mounts") ;
+    if (fd_cat(fd, 1) < 0) strerr_diefu2sys(111, "fd_cat ", "/proc/mounts") ;
+    fd_close(fd) ;
+  }
+  else if (argc == 1) strerr_dieusage(100, USAGE) ;
+  else if (!stralloc_0(&data)) strerr_diefu1sys(111, "build data string") ;  
+  else if (mount(argv[0], argv[1], fstype, flags, data.s) == -1)
+    strerr_diefu4sys(111, "mount ", argv[0], " on ", argv[1]) ;
+  return 0 ;
+}
-- 
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