[PATCH 1/5] erofs-utils: tests: add generic helper for xattrs

[Jingbo Xu <jefflexu@linux.alibaba.com>]

Add a helper checking if xattr progs are available.

Add helpers generating random strings which could be used as
key/value of xattr.

Add a helper checking if same named files under two directories have
same xattrs.

Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
 tests/common/rc | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tests/common/rc b/tests/common/rc
index a9ae369..293e556 100644
--- a/tests/common/rc
+++ b/tests/common/rc
@@ -86,6 +86,12 @@ _require_root()
 	[ "$(id -u)" = "0" ] || _notrun "must be run as root"
 }
 
+_require_xattr()
+{
+	which setfattr >/dev/null 2>&1 ||
+		_notrun "attr isn't installed, skipped."
+}
+
 # this test requires erofs kernel support
 _require_erofs()
 {
@@ -315,6 +321,32 @@ _require_fssum()
 	[ -x $FSSUM_PROG ] || _notrun "fssum not built"
 }
 
+# generate random string with maximum $1 length
+_random()
+{
+	head -20 /dev/urandom | base64 -w0 | head -c $1
+}
+
+# generate short random string
+_srandom()
+{
+	_random 16
+}
+
+# check xattrs of same files under two directories
+_check_xattrs()
+{
+	local dir1="$1"
+	local dir2="$2"
+	local dirs=`ls $dir1`
+
+	for d in $dirs; do
+		xattr1=`getfattr --absolute-names -d $dir1/$d | tail -n+2`
+		xattr2=`getfattr --absolute-names -d $dir2/$d | tail -n+2`
+		[ "x$xattr1" = "x$xattr2" ] || _fail "-->check xattrs FAILED"
+	done
+}
+
 _check_results()
 {
 	[ -z $srcdir ] && return 0
-- 
1.8.3.1