samba_backup: fix bug, add command line parameter, improve error messages

Also remove .bak suffix from tdb/ldb backups for more consistent restore procedures

Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Matthieu Patou <mat@matws.net>

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Sat Oct  5 13:51:34 CEST 2013 on sn-devel-104

1 files changed, 37 insertions, 15 deletions

diff --git a/source4/scripting/bin/samba_backup b/source4/scripting/bin/samba_backup
index 8f9cc838a77..3e22abecd9e 100755
--- a/source4/scripting/bin/samba_backup
+++ b/source4/scripting/bin/samba_backup
@@ -15,24 +15,39 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
+# Revised 2013-09-25, Brian Martin, as follows:
+#    - Allow retention period ("DAYS") to be specified as a parameter.
+#    - Allow individual positional parameters to be left at the default
+#      by specifying "-"
+#    - Use IS0 8601 standard dates (yyyy-mm-dd instead of mmddyyyy).
+#    - Display tar exit codes when reporting errors.
+#    - Don't send error messages to /dev/null, so we know what failed.
+#    - Suppress useless tar "socket ignored" message.
+#    - Fix retention period bug when deleting old backups ($DAYS variable
+#      could be set, but was ignored).
+
+
 
 FROMWHERE=/usr/local/samba
 WHERE=/usr/local/backups
+DAYS=90				# Set default retention period.
 if [ -n "$1" ] && [ "$1" = "-h" -o "$1" = "--usage" ]; then
-	echo "samba_backup [provisiondir] [destinationdir]"
-	echo "Will backup your provision located in provisiondir to archive stored in destinationdir"
+	echo "samba_backup [provisiondir] [destinationdir] [retpd]"
+	echo "Will backup your provision located in provisiondir to archive stored"
+	echo "in destinationdir for retpd days. Use - to leave an option unchanged."
 	echo "Default provisiondir: $FROMWHERE"
 	echo "Default destinationdir: $WHERE"
+	echo "Default destinationdir: $DAYS"
 	exit 0
 fi
 
-[ -n "$1" -a -d "$1" ]&&FROMWHERE=$1
-[ -n "$2" -a -d "$2" ]&&WHERE=$2
+[ -n "$1" -a "$1" != "-" ]&&FROMWHERE=$1	# Use parm or default if "-".  Validate later.
+[ -n "$2" -a "$2" != "-" ]&&WHERE=$2		# Use parm or default if "-".  Validate later.
+[ -n "$3" -a "$3" -eq "$3" 2> /dev/null ]&&DAYS=$3	# Use parm or default if non-numeric (incl "-").
 
 DIRS="private etc sysvol"
 #Number of days to keep the backup
-DAYS=90
-WHEN=`date +%d%m%y`
+WHEN=`date +%Y-%m-%d`	# ISO 8601 standard date.
 
 if [ ! -d $WHERE ]; then
 	echo "Missing backup directory $WHERE"
@@ -52,24 +67,31 @@ for d in $DIRS;do
 		find $relativedirname -name "*.ldb.bak" -exec rm {} \;
 		for ldb in `find $relativedirname -name "*.ldb"`; do
 			tdbbackup $ldb
-			if [ $? -ne 0 ]; then
-				echo "Error while backuping $ldb"
+			Status=$?	# Preserve $? for message, since [ alters it.
+			if [ $Status -ne 0 ]; then
+				echo "Error while backing up $ldb - status $Status"
 				exit 1
 			fi
 		done
-		tar cjf ${WHERE}/samba4_${n}.${WHEN}.tar.bz2  $relativedirname --exclude=*.ldb >/dev/null 2>&1
-		if [ $? -ne 0 ]; then
-			echo "Error while archiving ${WHERE}/samba4_${n}.${WHEN}.tar.bz2"
+		# Run the backup.
+		#    --warning=no-file-ignored set to suppress "socket ignored" messages.
+		tar cjf ${WHERE}/samba4_${n}.${WHEN}.tar.bz2  $relativedirname --exclude=\*.ldb --warning=no-file-ignored --transform 's/.ldb.bak$/.ldb/'
+		Status=$?	# Preserve $? for message, since [ alters it.
+		if [ $Status -ne 0 -a $Status -ne 1 ]; then	# Ignore 1 - private dir is always changing.
+			echo "Error while archiving ${WHERE}/samba4_${n}.${WHEN}.tar.bz2 - status = $Status"
 			exit 1
 		fi
 		find $relativedirname -name "*.ldb.bak" -exec rm {} \;
 	else
-		tar cjf ${WHERE}/${n}.${WHEN}.tar.bz2  $relativedirname >/dev/null 2>&1
-		if [ $? -ne 0 ]; then
-			echo "Error while archiving ${WHERE}/${n}.${WHEN}.tar.bz2"
+		# Run the backup.
+		#    --warning=no-file-ignored set to suppress "socket ignored" messages.
+		tar cjf ${WHERE}/${n}.${WHEN}.tar.bz2  $relativedirname --warning=no-file-ignored
+		Status=$?	# Preserve $? for message, since [ alters it.
+		if [ $Status -ne 0 ]; then
+			echo "Error while archiving ${WHERE}/${n}.${WHEN}.tar.bz2 - status = $Status"
 			exit 1
 		fi
 	fi
 done
 
-find $WHERE -name "samba4_*bz2" -mtime +90 -exec rm  {} \; >/dev/null 2>&1
+find $WHERE -name "samba4_*bz2" -mtime +$DAYS -exec rm  {} \;