backend-xattr-sanitize.sh: script added to extras/

Run the script as:

sh$ ./backend-xattr-sanitize.sh /data/export0

and it will remove all the known stale xattrs on the backend files and dirs

extras/Makefile.am

@@ -5,7 +5,7 @@ EditorMode_DATA = glusterfs-mode.el glusterfs.vim
 
 SUBDIRS = init.d benchmarking
 
-EXTRA_DIST = specgen.scm MacOSX/Portfile glusterfs-mode.el glusterfs.vim migrate-unify-to-distribute.sh
+EXTRA_DIST = specgen.scm MacOSX/Portfile glusterfs-mode.el glusterfs.vim migrate-unify-to-distribute.sh backend-xattr-sanitize.sh
 
 CLEANFILES = 
 

extras/backend-xattr-sanitize.sh

@@ -0,0 +1,66 @@
+#!/bin/sh
+
+# Each entry in the array below is a regular expression to match stale keys
+
+xs=("trusted.glusterfs.createtime"
+    "trusted.glusterfs.version"
+    "trusted.glusterfs.afr.data-pending"
+    "trusted.glusterfs.afr.metadata-pending"
+    "trusted.glusterfs.afr.entry-pending")
+    
+absolute_path()
+{
+    local dir=$(dirname "$1");
+    local base=$(basename "$1");
+    cd "$dir";
+    echo $(pwd)/"$base";
+    cd - >/dev/null;
+}
+
+
+cleanup()
+{
+    sanitizee=$(absolute_path "$1");
+
+    stale_keys=$(
+        for pattern in ${xs[@]}; do
+            getfattr -d -m "$pattern" "$sanitizee" 2>/dev/null |
+            grep = | cut -f1 -d=;
+        done
+        )
+
+    if [ -z "$stale_keys" ]; then
+        return;
+    fi
+
+    for key in $stale_keys; do
+        echo "REMOVEXATTR ($key) $sanitizee";
+        setfattr -x "$key" "$sanitizee";
+    done
+}
+
+
+crawl()
+{
+    this_script=$(absolute_path "$0");
+
+    export sanitize=yes;
+    find "$1" -exec "$this_script" {} \;
+}
+
+
+main()
+{
+    if [ -z "$1" ]; then
+        echo "Usage: $0 <export-dir>"
+        return 1
+    fi
+
+    if [ "$sanitize" = "yes" ]; then
+        cleanup "$@";
+    else
+        crawl "$@";
+    fi
+}
+
+main "$@"