units: mount /tmp as tmpfs

The default setups should be a stateless as possible. /tmp as tmpfs is
the intended default for general purpose systems.

Small temporary files should not be stored on disk; lager files, or
files which should potentially survive a reboot, belong into /var/tmp.

Also catch up with some good old UNIX history.

More details are here:
  https://fedoraproject.org/wiki/Features/tmp-on-tmpfs

diff --git a/Makefile.am b/Makefile.am
index 72bbcc27cf8df7162c9dcb287a480b33b926790e..daa4030988ab3296d3970180f667bbb64ec0deda 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -289,6 +289,7 @@ dist_systemunit_DATA = \
        units/sys-kernel-config.mount \
        units/sys-kernel-debug.mount \
        units/sys-fs-fuse-connections.mount \
+       units/tmp.mount \
        units/remount-rootfs.service \
        units/printer.target \
        units/sound.target \
@@ -2275,10 +2276,12 @@ systemd-install-data-hook:
        ( cd $(DESTDIR)$(systemunitdir)/local-fs.target.wants && \
                rm -f systemd-remount-api-vfs.service \
                        fsck-root.service \
-                       remount-rootfs.service && \
+                       remount-rootfs.service \
+                       tmp.mount && \
                $(LN_S) ../systemd-remount-api-vfs.service systemd-remount-api-vfs.service && \
                $(LN_S) ../fsck-root.service fsck-root.service && \
-               $(LN_S) ../remount-rootfs.service remount-rootfs.service )
+               $(LN_S) ../remount-rootfs.service remount-rootfs.service && \
+               $(LN_S) ../tmp.mount tmp.mount )
        ( cd $(DESTDIR)$(userunitdir) && \
                rm -f shutdown.target sockets.target bluetooth.target printer.target sound.target && \
                $(LN_S) $(systemunitdir)/shutdown.target shutdown.target && \

diff --git a/units/tmp.mount b/units/tmp.mount
new file mode 100644 (file)
index 0000000..8d0b8af
--- /dev/null
+++ b/units/tmp.mount
@@ -0,0 +1,16 @@
+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU General Public License as published by
+#  the Free Software Foundation; either version 2 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Temporary Directory
+Before=local-fs.target
+
+[Mount]
+What=tmpfs
+Where=/tmp
+Type=tmpfs
+Options=mode=1777