Hi,
I opened FS#47893 [1] to discuss this issue, but it's been closed with
no delay and I can't really have a discussion via re-opening requests.
Upon installation of the tor package, directory /var/lib/tor is created
(see PKGBUILD#40 [2]). Upon uninstallation, it is automatically deleted
**only if empty**:
# pacman -S tor
# touch /var/lib/tor/test
# pacman -Rns tor
# ls -lah /var/lib/tor
total 8,0K
drwx------ 2 tor tor 4,0K 25 janv. 16:50 .
drwxr-xr-x 39 root root 4,0K 25 janv. 16:50 ..
-rw-r--r-- 1 root root 0 25 janv. 16:50 test
# rm -rf /var/lib/tor
# pacman -S tor
...
(1/1) installing tor
error: command failed to execute correctly
...
# pacman -Rns tor
# ls -lah /var/lib/tor
ls: cannot access /var/lib/tor: No such file or directory
However, tor user and group (UID/GID 43) created via post_install() hook
[3] are not removed:
# pacman -Rns tor
$ id tor
uid=43(tor) gid=43(tor) groupes=43(tor)
This makes shadow.service fail at bootup:
pwck[718]: tor user: directory « /var/lib/tor » does not exist
pwck[718]: pwck : no change
systemd[1]: shadow.service: Main process exited, code=exited,
status=2/INVALIDARGUMENT
systemd[1]: Failed to start Verify integrity of password and group files.
systemd[1]: shadow.service: Unit entered failed state.
systemd[1]: shadow.service: Failed with result 'exit-code'.
Same for pwck.
What I asked in FS#47893 was to add a post_uninstall() hook to remove
tor user (e.g. with `userdel tor`), so that **if /var/lib/tor has been
deleted automatically** because it was empty, pwck doesn't trip on home
dir verification.
Note that if /var/lib/tor isn't empty, `userdel tor` would merely remove
the user entry and not delete its home directory (-r switch). Therefore,
no data loss. Moreover, I believe it is possible to condition user
deletion on directory existence (e.g. `if [ ! -e /var/lib/tor ]; then
userdel tor; else :`), so that could do it too.
Reason for closing was "Not a bug / So fix it. This isn't something that
can be dealt with automatically". I fail to see how it is so, but if I'm
wrong please tell me so and why.
Thanks,
Bastien
[1] https://bugs.archlinux.org/task/47893
[2]
https://projects.archlinux.org/svntogit/community.git/tree/trunk/PKGBUILD?h=packages/tor#n40
[3]
https://projects.archlinux.org/svntogit/community.git/tree/trunk/tor.install?h=packages/tor
