utmp: rewrite utmp logging

This patch generalizes the utmp support, to not only support
libutempter, but also ulog (and in the future, even more interfaces).

* Rename config option main.utempter to main.utmp-helper
* Add meson option -Dutmp-backend=none|libutempter|ulog|auto
* Rename meson option -Ddefault-utempter-path to -Dutmp-default-helper-path
* utmp is no longer detected at compile time, but at runtime instead.

Meson will configure the following pre-processor macros, based on the
selected utmp backend:

* UTMP_ADD - argument to pass to utmp helper when adding a record (starting foot)
* UTMP_DEL - argument to pass to utmp helper when removing a record (exiting foot)
* UTMP_DEL_HAVE_ARGUMENT - if defined, UTMP_DEL expects an extra argument ($WAYLAND_DISPLAY)
* UTMP_DEFAULT_HELPER_PATH - path to the default utmp helper binary

The documentation has been updated to mention which arguments are
passed to the helper binary.

Closes #1314
This commit is contained in:
Daniel Eklöf 2023-05-17 20:51:40 +02:00
parent a2f765b72a
commit e78319fccd
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11 changed files with 159 additions and 58 deletions

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@ -34,7 +34,8 @@
# word-delimiters=,│`|:"'()[]{}<>
# selection-target=primary
# workers=<number of logical CPUs>
# utempter=/usr/lib/utempter/utempter
# utmp-helper=/usr/lib/utempter/utempter # When utmp backend is libutempter (Linux)
# utmp-helper=/usr/libexec/ulog-helper # When utmp backend is ulog (FreeBSD)
[environment]
# name=value