Prevent error messages to stderr caused by libblkid calling libdevmapper

Make the libdevmapper fail quietly if blkid is called without root
privileges or the kernel does not include device mapper support.
(What is the device mapper _library_ doing writing to stderr, anyway?)

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/lib/blkid/ChangeLog b/lib/blkid/ChangeLog
index e0dac82..d46df09 100644 (file)
--- a/lib/blkid/ChangeLog
+++ b/lib/blkid/ChangeLog
@@ -1,3 +1,11 @@
+2006-03-19  Theodore Ts'o  <tytso@mit.edu>
+
+       * devname.c (dm_probe_all, dm_device_is_leaf): Make the
+               libdevmapper fail quietly if blkid is called without root
+               privileges or the kernel does not include device mapper
+               support.  (What is the device mapper _library_ doing
+               writing to stderr, anyway?)
+
 2006-03-12  Theodore Ts'o  <tytso@mit.edu>
 
        * probe.c (blkid_verify): Fix the bid_time sanity checking logic,

diff --git a/lib/blkid/devname.c b/lib/blkid/devname.c
index b2ff40f..4c2c895 100644 (file)
--- a/lib/blkid/devname.c
+++ b/lib/blkid/devname.c
@@ -154,6 +154,12 @@ set_pri:
 }
 
 #ifdef HAVE_DEVMAPPER
+static void dm_quiet_log(int level, const char *file, int line,
+                        const char *f, ...)
+{
+       return;
+}
+
 /* 
  * device-mapper support 
  */
@@ -203,9 +209,11 @@ static int dm_device_is_leaf(const dev_t dev)
        unsigned int next = 0;
        int n, ret = 1;
 
+       dm_log_init(dm_quiet_log);
        task = dm_task_create(DM_DEVICE_LIST);
        if (!task)
                return 1;
+       dm_log_init(0);
 
        dm_task_run(task);
        names = dm_task_get_names(task);
@@ -262,9 +270,11 @@ static void dm_probe_all(blkid_cache cache, int only_if_new)
        unsigned int next = 0;
        int n;
 
+       dm_log_init(dm_quiet_log);
        task = dm_task_create(DM_DEVICE_LIST);
        if (!task)
                return;
+       dm_log_init(0);
 
        dm_task_run(task);
        names = dm_task_get_names(task);