Daan De Meyer
25f8fcab66
Distributions install .wants/, .requires/ and .upholds/ symlinks in /usr/lib/systemd/system/, and PID 1 acts on those exactly like on the ones in /etc/. The install layer doesn't know about that tier at all, so "systemctl is-enabled" reports such units as "disabled" (or "static" for instances) even though they start at boot. On a stock Arch install man-db.timer reports "disabled" while being active. Let's teach find_symlinks_in_scope() about that tier. A dependency symlink below /usr/ now enables the unit, but only one that "systemctl enable" would create, i.e. one in a directory that WantedBy=, RequiredBy= or UpheldBy= in the [Install] section names. Any other such symlink is a static dependency rather than enablement, and reporting the unit as "enabled" because of it would suggest it can be disabled again. remote-cryptsetup.target has WantedBy=multi-user.target, and we install a symlink to it in initrd-root-device.target.wants/, which must not make it report as enabled. Alias= and Also= don't count, as neither results in a dependency symlink. This means "systemctl is-enabled" now exits 0 where it used to exit 1 for these units. Distributions install such symlinks for a number of units, so packaging scripts may notice. Turning them off is a separate matter: disable still can't, which is no worse than before.
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