Autogen refresh for udev changes

[zfs.git] / cmd / zpool_id / zpool_id

diff --git a/cmd/zpool_id/zpool_id b/cmd/zpool_id/zpool_id
index c363784..9d2a845 100755 (executable)
--- a/cmd/zpool_id/zpool_id
+++ b/cmd/zpool_id/zpool_id
@@ -2,7 +2,7 @@
 
 CONFIG=${CONFIG:-/etc/zfs/zdev.conf}
 PATH_ID=${PATH_ID:-/lib/udev/path_id}
-AWK=${AWK:-/bin/awk}
+AWK=${AWK:-/usr/bin/awk}
 
 die() {
        echo "Error: $*"
@@ -39,16 +39,25 @@ done
 # Check for the existence of a configuration file
 [ ! -f ${CONFIG} ] && die "Missing config file: ${CONFIG}"
 
-# Use udev's path_id to generate a unique persistent key
-eval `${PATH_ID} ${DEVICE}`
-[ -z ${ID_PATH} ] && die "Missing ID_PATH for ${DEVICE}"
+# If we are handling a multipath device then $DM_UUID will be
+# exported and we'll use its value (prefixed with dm-uuid per
+# multipathd's naming convention) as our unique persistent key.
+# For traditional devices we'll obtain the key from udev's
+# path_id.
+if [ -n "${DM_UUID}" ] && echo ${DM_UUID} | egrep -q -e '^mpath' ; then
+       ID_PATH="dm-uuid-${DM_UUID}"
+else
+       eval `${PATH_ID} ${DEVICE}`
+       [ -z ${ID_PATH} ] && die "Missing ID_PATH for ${DEVICE}"
+fi
 
 # Use the persistent key to lookup the zpool device id in the
 # configuration file which is of the format <device id> <key>.
 # Lines starting with #'s are treated as comments and ignored.
 # Exact matches are required, wild cards are not supported,
-# and only the first match is returned.
-ID_ZPOOL=`${AWK} "/${ID_PATH}\>/ && !/^#/ { print \\$1; exit }" ${CONFIG}`
+# and only the first match is returned.  Also note the following
+# regex pattern only appears to work with gawk, not mawk or awk.
+ID_ZPOOL=`${AWK} "/\<${ID_PATH}\>/ && !/^#/ { print \\$1; exit }" ${CONFIG}`
 [ -z ${ID_ZPOOL} ] && die "Missing ID_ZPOOL for ID_PATH: ${ID_PATH}"
 
 if [ ${ID_ZPOOL} ]; then