Add systemd branch

Makefile

@@ -1,19 +1,27 @@
 PREFIX := /usr/local
+SYSTEMD_HOME := $(PREFIX)/lib/systemd/system
 
 all:
+.PHONY: 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)/share/man/man8
-	install src/zfs-auto-snapshot.8 $(DESTDIR)$(PREFIX)/share/man/man8/zfs-auto-snapshot.8
-	install -d $(DESTDIR)$(PREFIX)/sbin
-	install src/zfs-auto-snapshot.sh $(DESTDIR)$(PREFIX)/sbin/zfs-auto-snapshot
+	install -m 0755 -d $(DESTDIR)$(PREFIX)/sbin $(DESTDIR)$(PREFIX)/share/man/man8
+	install -m 0755 src/zfs-auto-snapshot.sh $(DESTDIR)$(PREFIX)/sbin/zfs-auto-snapshot
+	install -m 0644 -t $(DESTDIR)$(PREFIX)/share/man/man8 src/zfs-auto-snapshot.8
+	install -m 0644 -t $(DESTDIR)$(SYSTEMD_HOME) \
+		timers/zfs-auto-snapshot-daily.service \
+		timers/zfs-auto-snapshot-daily.timer \
+		timers/zfs-auto-snapshot-frequent.service \
+		timers/zfs-auto-snapshot-frequent.timer \
+		timers/zfs-auto-snapshot-hourly.service \
+		timers/zfs-auto-snapshot-hourly.timer \
+		timers/zfs-auto-snapshot-monthly.service \
+		timers/zfs-auto-snapshot-monthly.timer \
+		timers/zfs-auto-snapshot-weekly.service \
+		timers/zfs-auto-snapshot-weekly.timer \
+		timers/zfs-auto-snapshot.target
+.PHONY: install
+
+enable:
+	systemctl enable --now zfs-auto-snapshot.target
+.PHONY: enable

README.md

@@ -0,0 +1,88 @@
+# zfs-auto-snapshot
+
+An alternative implementation of the zfs-auto-snapshot service for Linux
+that is compatible with [ZFS on Linux](http://zfsonlinux.org/).
+
+Automatically create, rotate, and destroy periodic ZFS snapshots. This is
+the utility that creates the:
+
+* @zfs-auto-snap_frequent,
+* @zfs-auto-snap_hourly,
+* @zfs-auto-snap_daily,
+* @zfs-auto-snap_weekly, and
+* @zfs-auto-snap_monthly
+
+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 (using the scripts
+in `etc`).
+
+## Installation using cron
+
+```sh
+wget https://github.com/zfsonlinux/zfs-auto-snapshot/archive/master.zip
+unzip master.zip
+cd zfs-auto-snapshot-master
+make install
+```
+
+## Installation using systemd
+
+```sh
+wget https://github.com/zfsonlinux/zfs-auto-snapshot/archive/systemd.zip
+unzip systemd.zip
+cd zfs-auto-snapshot-systemd
+make install enable
+```
+
+### Scheduling
+
+See [systemd timers](https://wiki.archlinux.org/index.php/Systemd/Timers).
+
+You can find some example `.timer` files in the `timers/` directory of this
+repo. They will be installed when you run `make install` from the `systemd`
+git branch.
+
+If you wish to edit the timers, you will find them in the
+`/usr/local/lib/systemd/system/` directory. Save the edited timers to
+`/etc/systemd/system/` directory to override the default timers.
+
+### Managing Which Pools to Snapshot
+
+By default, the script will snapshot all pools automatically, unless they
+have the `com.sun:auto-snapshot` property set to `false`.
+
+To check the status of this property for all of your pools and datasets, run
+the following command:
+
+```sh
+sudo zfs get com.sun:auto-snapshot
+```
+
+If you see an output like the following, then snapshots are enabled on this
+pool:
+
+```
+NAME     PROPERTY               VALUE                  SOURCE
+archive  com.sun:auto-snapshot  -                      -
+```
+
+To disable snapshots on this pool, issue the following command:
+
+```sh
+sudo zfs set com.sun:auto-snapshot=false archive
+```
+
+We can check with `zfs get` again, and this time our output should look like the following. If we see this, we know that snapshots have been disabled on this pool:
+
+```
+NAME     PROPERTY               VALUE                  SOURCE
+archive  com.sun:auto-snapshot  false                  local
+```
+
+To disable snapshots on a single dataset, the command is very similar:
+
+```sh
+sudo zfs set com.sun:auto-snapshot=false archive/dataset
+```

timers/zfs-auto-snapshot-daily.service

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+[Unit]
+Description=ZFS daily snapshot service
+
+[Service]
+ExecStart=/usr/local/sbin/zfs-auto-snapshot --quiet --syslog --label=daily --keep=31 //

timers/zfs-auto-snapshot-daily.timer

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+# See systemd.timer and systemd.time manpages for details
+[Unit]
+Description=ZFS daily snapshot timer
+
+[Timer]
+OnCalendar=daily
+Persistent=true
+RandomizedDelaySec=600

timers/zfs-auto-snapshot-frequent.service

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+Description=ZFS frequent snapshot service
+
+[Service]
+ExecStart=/usr/local/sbin/zfs-auto-snapshot --quiet --syslog --label=frequent --keep=4 //

timers/zfs-auto-snapshot-frequent.timer

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+# See systemd.timer and systemd.time manpages for details
+[Unit]
+Description=ZFS frequent snapshot timer
+
+[Timer]
+OnCalendar=*:0/15
+Persistent=true
+RandomizedDelaySec=60

timers/zfs-auto-snapshot-hourly.service

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+[Unit]
+Description=ZFS hourly snapshot service
+
+[Service]
+ExecStart=/usr/local/sbin/zfs-auto-snapshot --quiet --syslog --label=hourly --keep=24 //

timers/zfs-auto-snapshot-hourly.timer

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+# See systemd.timer and systemd.time manpages for details
+[Unit]
+Description=ZFS hourly snapshot timer
+
+[Timer]
+OnCalendar=hourly
+Persistent=true
+RandomizedDelaySec=59

timers/zfs-auto-snapshot-monthly.service

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+Description=ZFS monthly snapshot service
+
+[Service]
+ExecStart=/usr/local/sbin/zfs-auto-snapshot --quiet --syslog --label=monthly --keep=12 //

timers/zfs-auto-snapshot-monthly.timer

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+# See systemd.timer and systemd.time manpages for details
+[Unit]
+Description=ZFS monthly snapshot timer
+
+[Timer]
+OnCalendar=monthly
+Persistent=true
+RandomizedDelaySec=600

timers/zfs-auto-snapshot-weekly.service

@@ -0,0 +1,5 @@
+[Unit]
+Description=ZFS weekly snapshot service
+
+[Service]
+ExecStart=/usr/local/sbin/zfs-auto-snapshot --quiet --syslog --label=weekly --keep=8 //

timers/zfs-auto-snapshot-weekly.timer

@@ -0,0 +1,7 @@
+[Unit]
+Description=ZFS weekly snapshot timer
+
+[Timer]
+OnCalendar=weekly
+Persistent=true
+RandomizedDelaySec=600

timers/zfs-auto-snapshot.target

@@ -0,0 +1,11 @@
+# See systemd.target and systemd.unit manpages for details
+[Unit]
+Description=Automatically create, rotate, and destroy periodic ZFS snapshots.
+Requires=zfs-auto-snapshot-frequent.timer
+Requires=zfs-auto-snapshot-daily.timer
+Requires=zfs-auto-snapshot-hourly.timer
+Requires=zfs-auto-snapshot-weekly.timer
+Requires=zfs-auto-snapshot-monthly.timer
+
+[Install]
+WantedBy=timers.target