From a5726f2f53f3560e0bfe4bf75acf79b2e61f35b6 Mon Sep 17 00:00:00 2001
From: =?latin1?q?P=E1draig=20Brady?= <P@draigBrady.com>
Date: Sun, 5 Apr 2015 18:21:38 +0100
Subject: df: fix --local hanging with inaccessible remote mounts

* src/df.c (filter_mount_list): With -l, avoid stating remote mounts.
* init.cfg: Avoid test hangs with inaccessible remote mounts.
* tests/df/no-mtab-status.sh: Skip with inaccessible remote mounts.
* tests/df/skip-rootfs.sh: Likewise.
* tests/df/total-verify.sh: Likewise.
* NEWS: Mention the bug fix.
Reported at http://bugzilla.redhat.com/1199679
(cherry picked from commit 1b1c40e1d6f8cf30b6c7c9d31bbddbc3d5cc72e6)

Conflicts:
	NEWS
---
 init.cfg                   | 2 +-
 src/df.c                   | 9 ++++++---
 tests/df/no-mtab-status.sh | 3 ++-
 tests/df/skip-rootfs.sh    | 3 ++-
 tests/df/total-verify.sh   | 3 ++-
 5 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/init.cfg b/init.cfg
index 032646b..527e5fa 100644
--- a/init.cfg
+++ b/init.cfg
@@ -79,7 +79,7 @@ is_local_dir_()
 require_mount_list_()
 {
   local mount_list_fail='cannot read table of mounted file systems'
-  df 2>&1 | grep -F "$mount_list_fail" >/dev/null &&
+  df --local 2>&1 | grep -F "$mount_list_fail" >/dev/null &&
     skip_ "$mount_list_fail"
 }
 
diff --git a/src/df.c b/src/df.c
index 9d1b6bb..81c047d 100644
--- a/src/df.c
+++ b/src/df.c
@@ -622,13 +622,16 @@ filter_mount_list (bool devices_only)
       struct devlist *devlist;
       struct mount_entry *discard_me = NULL;
 
-      /* TODO: On Linux we might avoid this stat() and another in get_dev()
+      /* Avoid stating remote file systems as that may hang.
+         TODO: On Linux we might avoid this stat() and another in get_dev()
          by using the device IDs available from /proc/self/mountinfo.
          read_file_system_list() could populate me_dev from those
          for efficiency and accuracy.  */
-      if (-1 == stat (me->me_mountdir, &buf))
+      if ((me->me_remote && show_local_fs)
+          || -1 == stat (me->me_mountdir, &buf))
         {
-          /* Stat failed - add ME to be able to complain about it later.  */
+          /* If remote, and showing just local, add ME for filtering later.
+             If stat failed; add ME to be able to complain about it later.  */
           buf.st_dev = me->me_dev;
         }
       else
diff --git a/tests/df/no-mtab-status.sh b/tests/df/no-mtab-status.sh
index 9ea2036..86840e2 100755
--- a/tests/df/no-mtab-status.sh
+++ b/tests/df/no-mtab-status.sh
@@ -21,7 +21,8 @@
 print_ver_ df
 require_gcc_shared_
 
-df || skip_ "df fails"
+# Protect against inaccessible remote mounts etc.
+timeout 10 df || skip_ "df fails"
 
 grep '^#define HAVE_MNTENT_H 1' $CONFIG_HEADER > /dev/null \
       || skip_ "no mntent.h available to confirm the interface"
diff --git a/tests/df/skip-rootfs.sh b/tests/df/skip-rootfs.sh
index 94f32c6..461ea54d 100755
--- a/tests/df/skip-rootfs.sh
+++ b/tests/df/skip-rootfs.sh
@@ -19,7 +19,8 @@
 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
 print_ver_ df
 
-df || skip_ "df fails"
+# Protect against inaccessible remote mounts etc.
+timeout 10 df || skip_ "df fails"
 
 # Verify that rootfs is in mtab (and shown when the -a option is specified).
 df -a >out || fail=1
diff --git a/tests/df/total-verify.sh b/tests/df/total-verify.sh
index 63cbe8f..3f71dd6 100755
--- a/tests/df/total-verify.sh
+++ b/tests/df/total-verify.sh
@@ -20,7 +20,8 @@
 print_ver_ df
 require_perl_
 
-df || skip_ "df fails"
+# Protect against inaccessible remote mounts etc.
+timeout 10 df || skip_ "df fails"
 
 cat <<\EOF > check-df || framework_failure_
 my ($total, $used, $avail) = (0, 0, 0);
-- 
1.7.12.1