File coreutils-use_the_last_device_name_provided_by_... of Package coreutils.669

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File coreutils-use_the_last_device_name_provided_by_the_system.patch of Package coreutils.669

commit 25a2c948b24163ce0e0e9e52f6a5fef33d7d7842
Author: Pádraig Brady <P@draigBrady.com>
Date:   Thu May 29 15:30:46 2014 +0100

df: use the last device name provided by the system
    
    The device name reported for a particular mount entry
    may no longer be valid if the mount point was subsequently
    mounted on a different device.  Therefore honor the order
    of the mount list returned by the system and use the last
    reported device name.
    
    * src/df.c (filter_mount_list): When discarding the current
    mount entry, ensure that a new device name is not also discarded.
    * tests/df/skip-duplicates.sh: Add a test case.  Also fix
    a false failure in the edge case of a system with only a
    single file system.
    * NEWS: Mention the fix.

---
 NEWS                        |    4 +++-
 src/df.c                    |   22 +++++++++++++++++++---
 tests/df/skip-duplicates.sh |   13 +++++++++----
 3 files changed, 31 insertions(+), 8 deletions(-)

Index: coreutils-8.22/NEWS
===================================================================
--- coreutils-8.22.orig/NEWS	2014-07-26 00:00:59.716631657 +0200
+++ coreutils-8.22/NEWS	2014-07-26 00:01:35.008190452 +0200
@@ -2,7 +2,9 @@ GNU coreutils NEWS
 
  Changes done after the release of 8.22
 
- df now correctly elides duplicates for virtual file systems like tmpfs.
+  df now elides duplicates for virtual file systems like tmpfs, and will
+  display the correct device name for directories mounted multiple times.
+  [These bugs were present in "the beginning".]
 
  Noteworthy changes in release 8.22 (2013-12-13) [stable]
 
Index: coreutils-8.22/src/df.c
===================================================================
--- coreutils-8.22.orig/src/df.c	2014-07-26 00:00:59.711631720 +0200
+++ coreutils-8.22/src/df.c	2014-07-26 00:00:59.716631657 +0200
@@ -604,7 +604,7 @@ excluded_fstype (const char *fstype)
 }
 
 /* Filter mount list by skipping duplicate entries.
-   In the case of duplicities - based on to the device number - the mount entry
+   In the case of duplicities - based on the device number - the mount entry
    with a '/' in its me_devname (i.e. not pseudo name like tmpfs) wins.
    If both have a real devname (e.g. bind mounts), then that with the shorter
    me_mountdir wins.  */
@@ -638,17 +638,33 @@ filter_mount_list (void)
 
           if (devlist)
             {
-              discard_me = me;
-
               /* ...let the shorter mountdir win.  */
               if ((strchr (me->me_devname, '/')
                    && ! strchr (devlist->me->me_devname, '/'))
                   || (strlen (devlist->me->me_mountdir)
                       > strlen (me->me_mountdir)))
                 {
+                  /* Discard mount entry for existing device.  */
                   discard_me = devlist->me;
                   devlist->me = me;
                 }
+              else
+                {
+                  /* Discard mount entry currently being processed.  */
+                  discard_me = me;
+
+                  /* We might still want the devname from this mount entry as
+                     the dev_num might not correlate with st_dev if another
+                     device is subsequently overmounted at mountdir, so honor
+                     the order of the presented list and replace with the
+                     latest devname encountered.  */
+                  if (! STREQ (devlist->me->me_devname, me->me_devname))
+                    {
+                      free (devlist->me->me_devname);
+                      devlist->me->me_devname = xstrdup (me->me_devname);
+                    }
+                }
+
             }
         }
 
Index: coreutils-8.22/tests/df/skip-duplicates.sh
===================================================================
--- coreutils-8.22.orig/tests/df/skip-duplicates.sh	2014-07-26 00:00:59.706631782 +0200
+++ coreutils-8.22/tests/df/skip-duplicates.sh	2014-07-26 00:00:59.716631657 +0200
@@ -55,7 +55,7 @@ struct mntent *getmntent (FILE *fp)
     {.mnt_fsname="/fsname", .mnt_dir="/."},
     {.mnt_fsname="/fsname", .mnt_dir="/"},
     {.mnt_fsname="virtfs",  .mnt_dir="/NONROOT"},
-    {.mnt_fsname="virtfs",  .mnt_dir="/NONROOT"},
+    {.mnt_fsname="virtfs2", .mnt_dir="/NONROOT"},
     {.mnt_fsname="netns",   .mnt_dir="net:[1234567]"},
   };
 
@@ -100,9 +100,14 @@ LD_PRELOAD=./k.so CU_TEST_DUPE_INVALID=1
 test $(wc -l <out) -eq $(expr 1 + $unique_entries) || { fail=1; cat out; }
 
 # df should also prefer "/fsname" over "fsname"
-test $(grep -c '/fsname' <out) -eq 1 || { fail=1; cat out; }
-# ... and "/fsname" with '/' as Mounted on over '/.'
-test $(grep -cF '/.' <out) -eq 0 || { fail=1; cat out; }
+if test "$unique_entries" = 2; then
+  test $(grep -c '/fsname' <out) -eq 1 || { fail=1; cat out; }
+  # ... and "/fsname" with '/' as Mounted on over '/.'
+  test $(grep -cF '/.' <out) -eq 0 || { fail=1; cat out; }
+fi
+
+# df should use the last seen devname (mnt_fsname)
+test $(grep -c 'virtfs2' <out) -eq 1 || { fail=1; cat out; }
 
 # Ensure that filtering duplicates does not affect -a processing.
 LD_PRELOAD=./k.so df -a >out || fail=1

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File coreutils-use_the_last_device_name_provided_by_the_system.patch of Package coreutils.669

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