Merge pull request #99 from stuehmer/patch-2

Merge changes fom master and add workaround for DASH shell problems

Makefile

@@ -1,18 +1,16 @@
-PREFIX := /usr/local
-
 all:
 
 install:
-	install -d $(DESTDIR)/etc/cron.d
-	install -d $(DESTDIR)/etc/cron.daily
-	install -d $(DESTDIR)/etc/cron.hourly
-	install -d $(DESTDIR)/etc/cron.weekly
-	install -d $(DESTDIR)/etc/cron.monthly
-	install -m 0644 etc/zfs-auto-snapshot.cron.frequent $(DESTDIR)/etc/cron.d/zfs-auto-snapshot
-	install etc/zfs-auto-snapshot.cron.hourly   $(DESTDIR)/etc/cron.hourly/zfs-auto-snapshot
-	install etc/zfs-auto-snapshot.cron.daily    $(DESTDIR)/etc/cron.daily/zfs-auto-snapshot
-	install etc/zfs-auto-snapshot.cron.weekly   $(DESTDIR)/etc/cron.weekly/zfs-auto-snapshot
-	install etc/zfs-auto-snapshot.cron.monthly  $(DESTDIR)/etc/cron.monthly/zfs-auto-snapshot
+	install -d $(DESTDIR)$(PREFIX)/etc/cron.d
+	install -d $(DESTDIR)$(PREFIX)/etc/cron.daily
+	install -d $(DESTDIR)$(PREFIX)/etc/cron.hourly
+	install -d $(DESTDIR)$(PREFIX)/etc/cron.weekly
+	install -d $(DESTDIR)$(PREFIX)/etc/cron.monthly
+	install etc/zfs-auto-snapshot.cron.frequent $(DESTDIR)$(PREFIX)/etc/cron.d/zfs-auto-snapshot
+	install etc/zfs-auto-snapshot.cron.hourly   $(DESTDIR)$(PREFIX)/etc/cron.hourly/zfs-auto-snapshot
+	install etc/zfs-auto-snapshot.cron.daily    $(DESTDIR)$(PREFIX)/etc/cron.daily/zfs-auto-snapshot
+	install etc/zfs-auto-snapshot.cron.weekly   $(DESTDIR)$(PREFIX)/etc/cron.weekly/zfs-auto-snapshot
+	install etc/zfs-auto-snapshot.cron.monthly  $(DESTDIR)$(PREFIX)/etc/cron.monthly/zfs-auto-snapshot
 	install -d $(DESTDIR)$(PREFIX)/share/man/man8
 	install src/zfs-auto-snapshot.8 $(DESTDIR)$(PREFIX)/share/man/man8/zfs-auto-snapshot.8
 	install -d $(DESTDIR)$(PREFIX)/sbin

README

@@ -10,12 +10,3 @@ snapshots if it is installed.
 
 This program is a posixly correct bourne shell script.  It depends only on
 the zfs utilities and cron, and can run in the dash shell.
-
-
-Installation:
--------------
-
-wget https://github.com/zfsonlinux/zfs-auto-snapshot/archive/master.zip
-unzip master.zip
-cd zfs-auto-snapshot-master
-make install

etc/zfs-auto-snapshot.cron.daily

@@ -1,5 +1,2 @@
 #!/bin/sh
-
-# Only call zfs-auto-snapshot if it's available
-exec which zfs-auto-snapshot > /dev/null && \
-     zfs-auto-snapshot --quiet --syslog --label=daily --keep=31 //
+exec zfs-auto-snapshot --quiet --syslog --label=daily --keep=31 //

etc/zfs-auto-snapshot.cron.frequent

@@ -1,3 +1,3 @@
-PATH="/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin"
+PATH="/usr/bin:/bin:/usr/sbin:/sbin"
 
-*/15 * * * * root which zfs-auto-snapshot > /dev/null && zfs-auto-snapshot --quiet --syslog --label=frequent --keep=4  //
+*/15 * * * * root zfs-auto-snapshot -q -g --label=frequent --keep=4  //

etc/zfs-auto-snapshot.cron.hourly

@@ -1,5 +1,2 @@
 #!/bin/sh
-
-# Only call zfs-auto-snapshot if it's available
-exec which zfs-auto-snapshot > /dev/null && \
-     zfs-auto-snapshot --quiet --syslog --label=hourly --keep=24 //
+exec zfs-auto-snapshot --quiet --syslog --label=hourly --keep=24 //

etc/zfs-auto-snapshot.cron.monthly

@@ -1,5 +1,2 @@
 #!/bin/sh
-
-# Only call zfs-auto-snapshot if it's available
-exec which zfs-auto-snapshot > /dev/null && \
-     zfs-auto-snapshot --quiet --syslog --label=monthly --keep=12 //
+exec zfs-auto-snapshot --quiet --syslog --label=monthly --keep=12 //

etc/zfs-auto-snapshot.cron.weekly

@@ -1,5 +1,2 @@
 #!/bin/sh
-
-# Only call zfs-auto-snapshot if it's available
-exec which zfs-auto-snapshot > /dev/null && \
-     zfs-auto-snapshot --quiet --syslog --label=weekly --keep=8 //
+exec zfs-auto-snapshot --quiet --syslog --label=weekly --keep=8 //

src/zfs-auto-snapshot.8

@@ -64,27 +64,6 @@ Snapshot named filesystem and all descendants.
 \fB\-v\fR, \fB\-\-verbose\fR
 Print info messages.
 .TP
-\fB\-\-pre-snapshot\fR=\fICOMMAND\fR
-Command to run before each dataset is snapshotted. 
-It is passed the dataset and snapshot name. If it
-returns non-zero, snapshotting this dataset is 
-aborted.
-.TP
-\fB\-\-post-snapshot\fR=\fICOMMAND\fR
-Command to run after each dataset is snapshotted. 
-It is passed the dataset and snapshot name.
-.TP
-\fB\-\-destroy-only\fR
-Do not create new snapshots, but do destroy older 
-snapshots. Has no effect unless used with \fB\-k\fR.
-.IP
-A non-obvious use may be constructon of cron jobs or
-scripts that run pre-snapshot command(s), then run 
-zfs-auto-snapshot (without \fB\-k\fR) to quickly
-snapshot all datasets, then run post-snapshot
-command(s) and clean up with zfs-auto-snapshot
-\fB\-\-destroy-only\fR.
-.TP
 name
 Filesystem and volume names, or '//' for all ZFS datasets.
 .SH SEE ALSO

src/zfs-auto-snapshot.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # zfs-auto-snapshot for Linux
 # Automatically create, rotate, and destroy periodic ZFS snapshots.
@@ -110,7 +110,7 @@ print_log () # level, message, ...
 			;;
 		(inf*)
 			# test -n "$opt_syslog" && logger -t "$opt_prefix" -p daemon.info $*
-			test -n "$opt_verbose" && echo $*
+			test -z ${opt_quiet+x} && test -n "$opt_verbose" && echo $*
 			;;
 		(deb*)
 			# test -n "$opt_syslog" && logger -t "$opt_prefix" -p daemon.debug $*
@@ -152,6 +152,7 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
 	local GLOB="$4"
 	local TARGETS="$5"
 	local KEEP=''
+	local LABEL="$6"
 	local RUNSNAP=1
 
 	# global DESTRUCTION_COUNT
@@ -183,15 +184,19 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
 		KEEP="$opt_keep"
 		
 		# ASSERT: The old snapshot list is sorted by increasing age.
-		for jj in $SNAPSHOTS_OLD
+		# Match on both $GLOB *and* label.
+		while IFS='	' read -ra arrjj
 		do
 			# Check whether this is an old snapshot of the filesystem.
-			if [ -z "${jj#$ii@$GLOB}" ]
+			if [ -z "${arrjj[1]#$ii@$GLOB}" ]
 			then
+				# Check whether the snapshot has the same label property
+				test "${arrjj[0]}" = "$LABEL" || continue
+			
 				KEEP=$(( $KEEP - 1 ))
 				if [ "$KEEP" -le '0' ]
 				then
-					if do_run "zfs destroy -d $FLAGS '$jj'" 
+					if do_run "zfs destroy -d $FLAGS '${arrjj[1]}'" 
 					then
 						DESTRUCTION_COUNT=$(( $DESTRUCTION_COUNT + 1 ))
 					else
@@ -199,7 +204,7 @@ do_snapshots () # properties, flags, snapname, oldglob, [targets...]
 					fi
 				fi
 			fi
-		done
+		done <<< "$SNAPSHOTS_OLD"
 	done
 }
 
@@ -367,20 +372,21 @@ fi
 ZPOOL_STATUS=$(env LC_ALL=C zpool status 2>&1 ) \
   || { print_log error "zpool status $?: $ZPOOL_STATUS"; exit 135; }
 
+
 ZFS_LIST=$(env LC_ALL=C zfs list -H -t filesystem,volume -s name \
   -o name,com.sun:auto-snapshot,com.sun:auto-snapshot:"$opt_label") \
   || { print_log error "zfs list $?: $ZFS_LIST"; exit 136; }
 
 if [ -n "$opt_fast_zfs_list" ]
 then
-	SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -o name -s name | \
+ 	SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -o com.sun:auto-snapshot-label,name -s name | \
 		grep $opt_prefix | \
 		awk '{ print substr( $0, length($0) - 14, length($0) ) " " $0}' | \
-		sort -r -k1,1 -k2,2 | \
+		sort -r -k1,1 -k3,2 | \
 		awk '{ print substr( $0, 17, length($0) )}') \
 	  || { print_log error "zfs list $?: $SNAPSHOTS_OLD"; exit 137; }
 else
-	SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -S creation -o name) \
+        SNAPSHOTS_OLD=$(env LC_ALL=C zfs list -H -t snapshot -S creation -o com.sun:auto-snapshot-label,name) \
 	  || { print_log error "zfs list $?: $SNAPSHOTS_OLD"; exit 137; }
 fi
 
@@ -440,7 +446,8 @@ do
 	# Just testing "$ii" != ${ii#$jj} would incorrectly match.
 	iii="$ii/"
 
-	# Exclude datasets that are not named on the command line.
+
+    # Exclude datasets that are not named on the command line.
 	IN_ARGS='0'
 	for jj in "$@"
 	do
@@ -530,17 +537,17 @@ done
 
 # Linux lacks SMF and the notion of an FMRI event, but always set this property
 # because the SUNW program does. The dash character is the default.
-SNAPPROP="-o com.sun:auto-snapshot-desc='$opt_event'"
+SNAPPROP="-o com.sun:auto-snapshot-desc='$opt_event' -o com.sun:auto-snapshot-label=$opt_label"
 
 # ISO style date; fifteen characters: YYYY-MM-DD-HHMM
 # On Solaris %H%M expands to 12h34.
 DATE=$(date --utc +%F-%H%M)
 
 # The snapshot name after the @ symbol.
-SNAPNAME="$opt_prefix${opt_label:+$opt_sep$opt_label}-$DATE"
+SNAPNAME="$opt_prefix$opt_sep$DATE"
 
 # The expression for matching old snapshots.  -YYYY-MM-DD-HHMM
-SNAPGLOB="$opt_prefix${opt_label:+?$opt_label}????????????????"
+SNAPGLOB="${opt_prefix}????????????????"
 
 if [ -n "$opt_do_snapshots" ]
 then
@@ -568,8 +575,8 @@ fi
 test -n "$opt_dry_run" \
   && print_log info "Doing a dry run. Not running these commands..."
 
-do_snapshots "$SNAPPROP" ""   "$SNAPNAME" "$SNAPGLOB" "$TARGETS_REGULAR"
-do_snapshots "$SNAPPROP" "-r" "$SNAPNAME" "$SNAPGLOB" "$TARGETS_RECURSIVE"
+do_snapshots "$SNAPPROP" ""   "$SNAPNAME" "$SNAPGLOB" "$TARGETS_REGULAR" "$opt_label"
+do_snapshots "$SNAPPROP" "-r" "$SNAPNAME" "$SNAPGLOB" "$TARGETS_RECURSIVE" "$opt_label"
 
 print_log notice "@$SNAPNAME," \
   "$SNAPSHOT_COUNT created," \