ctdb-scripts: Set ownership of statd-callout state directory

For add-client and del-client, statd-callout is called by rpc.statd,
which runs as rpcuser, statd or some other non-root system user.  This
means that add-client and del-client can't write in the statd-callout
state directory if it is only writable by root.  rpc.statd must be
able to write to its own local system statd state directory, so find
this directory and use it as a reference to set the ownership of
CTDB's statd-callout state directory.

Signed-off-by: Martin Schwenke <mschwenke@ddn.com>
Reviewed-by: Volker Lendecke <vl@samba.org>

diff --git a/ctdb/config/statd-callout b/ctdb/config/statd-callout
index cf03eeee801072e41251b7cc8466dd601045df29..e276d6cee315a6640b970038453608896acc79aa 100755 (executable)
--- a/ctdb/config/statd-callout
+++ b/ctdb/config/statd-callout
@@ -50,6 +50,39 @@ fi
 
 ctdb_setup_state_dir "service" "nfs"
 
+find_statd_sm_dir()
+{
+       if [ -n "$CTDB_TEST_MODE" ]; then
+               _f="${CTDB_TEST_TMP_DIR}/sm"
+               mkdir -p "$_f" "${_f}.bak"
+               echo "$_f"
+               return
+       fi
+
+       for _sm_dir in /var/lib/nfs/statd/sm /var/lib/nfs/sm; do
+               if [ -d "$_sm_dir" ]; then
+                       echo "$_sm_dir"
+                       break
+               fi
+       done
+}
+
+# Ensure the state directory exists and can be written when called as
+# a non-root user.  Assume the user to run as is the owner of the
+# system statd sm directory, since both rpc.statd and sm-notify run as
+# this directory's owner, so it can read and modify the directory.
+create_add_del_client_dir()
+{
+       _dir="$1"
+
+       if [ ! -d "$_dir" ]; then
+               mkdir -p "$_dir" || die "Failed to create directory \"${_dir}\""
+               ref=$(find_statd_sm_dir)
+               [ -n "$ref" ] || die "Failed to find statd sm directory"
+               chown --reference="$ref" "$_dir"
+       fi
+}
+
 # script_state_dir set by ctdb_setup_state_dir()
 # shellcheck disable=SC2154
 statd_callout_state_dir="${script_state_dir}/statd-callout"
@@ -116,8 +149,7 @@ delete_records()
 
 startup()
 {
-       mkdir -p "$statd_callout_queue_dir" ||
-               die "Failed to create directory \"${statd_callout_queue_dir}\""
+       create_add_del_client_dir "$statd_callout_queue_dir"
 
        $CTDB attach "$statd_callout_db" persistent
 }