[PATCH 4/6] mount: handle -t auto

[Justus Winter]

Use libblkid to detect the filesystem type if "auto" is given as
type. Remove the translator localization from main, this is also done
in do_mount and any errors are propagated properly. This way "auto" is
handled correctly if given on the command line or used as filesystem
type in the fstab.

* utils/mount.c (DEFAULT_FSTYPE): Use "auto" as default type.
(do_mount): Detect type using libblkid.
(main): Drop translator localization.
---
 utils/Makefile |    1 +
 utils/mount.c  |   27 +++++++++++++++++++--------
 2 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/utils/Makefile b/utils/Makefile
index 6975fb5..207c904 100644
--- a/utils/Makefile
+++ b/utils/Makefile
@@ -37,6 +37,7 @@ LDLIBS += -lpthread
 login-LDLIBS = -lutil $(LIBCRYPT)
 addauth-LDLIBS = $(LIBCRYPT)
 setauth-LDLIBS = $(LIBCRYPT)
+mount-LDLIBS = -lblkid
 
 INSTALL-login-ops = -o root -m 4755
 INSTALL-ids-ops = -o root -m 4755
diff --git a/utils/mount.c b/utils/mount.c
index 77b2138..5863f96 100644
--- a/utils/mount.c
+++ b/utils/mount.c
@@ -28,11 +28,12 @@
 #include <hurd/fsys.h>
 #include <hurd/fshelp.h>
 #include <hurd/paths.h>
+#include <blkid/blkid.h>
 
 #include "match-options.h"
 
 #define SEARCH_FMTS    _HURD "%sfs\0" _HURD "%s"
-#define DEFAULT_FSTYPE "ext2"
+#define DEFAULT_FSTYPE "auto"
 
 static char *fstype = DEFAULT_FSTYPE;
 static char *device, *mountpoint;
@@ -338,6 +339,23 @@ do_mount (struct fs *fs, int remount)
          return EBUSY;
        }
 
+      if (strcmp (fs->mntent.mnt_type, "auto") == 0)
+        {
+          char *type =
+            blkid_get_tag_value (NULL, "TYPE", fs->mntent.mnt_fsname);
+          if (! type)
+            {
+              error (0, 0, "failed to detect file system type");
+              return EFTYPE;
+            }
+          else
+            {
+              fs->mntent.mnt_type = strdup (type);
+              if (! fs->mntent.mnt_type)
+                error (3, ENOMEM, "failed to allocate memory");
+            }
+        }
+
       err = fs_type (fs, &type);
       if (err)
        {
@@ -579,13 +597,6 @@ main (int argc, char **argv)
        mnt_opts: 0,
        mnt_freq: 0, mnt_passno: 0
       };
-      struct fstype *fst;
-
-      err = fstypes_get (fstab->types, fstype, &fst);
-      if (err)
-       error (106, err, "cannot initialize type %s", fstype);
-      if (fst->program == 0)
-       error (2, 0, "filesystem type %s not recognized", fstype);
 
       err = fstab_add_mntent (fstab, &m, &fs);
       if (err)
-- 
1.7.10.4