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utmp: rewrite utmp logging

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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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21
doc/foot.ini.5.scd
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@ -343,9 +343,24 @@ empty string to be set, but it must be quoted: *KEY=""*)
(including SMT). Note that this is not always the best value. In
some cases, the number of physical _cores_ is better.
*utempter*
Path to utempter helper binary. Set to *none* to disable utmp
records. Default: _@utempter@_.
*utmp-helper*
Path to utmp logging helper binary.
When starting foot, an utmp record is created by launching the
helper binary with the following arguments:
```
@utmp_add_args@
```
When foot is closed, the utmp record is removed by launching the
helper binary with the following arguments:
```
@utmp_del_args@
```
Set to *none* to disable utmp records. Default: _@utmp_helper_path@_.
# SECTION: environment