On Mon, Feb 05, 2018 at 10:21:17AM -0800, Johannes Ernst wrote: > > > On Feb 4, 2018, at 21:56, Michael Chapman <m...@very.puzzling.org> wrote: > > > > On Mon, 5 Feb 2018, Johannes Ernst wrote: > >> It appears systemd-sysusers does not create home directories. On the other > >> hand, it picks (largely unpredictable) UIDs from a range. > >> > >> So I have to run systemd-sysusers, and after that, find the UID of the > >> user and chown the home directory? Or is there the equivalent of the > >> “useradd -m” flag somewhere that I’m just not seeing? > > > > systemd-sysusers is, as the name suggests, really for _system_ users, and > > often those kinds of users don't have ordinary home directories -- that is, > > ones the user can actually write to. > > I agree with the “often” but not more :-) > > > However, systemd-sysusers.service is ordered before > > systemd-tmpfiles-setup.service at boot, so if you need to create a system > > user's home directory and ensure its ownership is correct, you could use a > > corresponding tmpfiles.d fragment to do so. > > Hmm … tmpfiles.d, according to its man page, is for “the creation, cleaning > and removal of volatile and temporary files and directories which usually > reside in directories such as /run or /tmp.”. That doesn’t really seem to > cover home directories that contain actual data. > > Here’s my use case: Take a package for a daemon foo. The package contains a > foo.service, and when foo runs, it is supposed to run in its own little place > /var/lib/foo where it stores its data files. Because not everybody runs foo, > it doesn’t make sense to pick a “fixed” UID like for more common daemons. > Allocating a UID from a pool, like sysusers does, seems perfect. But how does > the package ship /var/lib/foo? It can’t ship with owner foo because we don’t > know what its UID is going to be. So the package, as part of its install > script, needs to do something like: > > systemd-sysusers > [[ -d /var/lib/foo ]] && mkdir -m755 /var/lib/foo > chown $(id -u foo):$(id -g foo) /var/lib/foo
# /usr/lib/tmpfiles.d/foo.conf d /var/lib/foo 0755 foo foo - (BTW, chown $(id -u foo):$(id -g foo) ... is the same as chown foo:foo ...). Zbyszek _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
