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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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6
meson_options.txt
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@ -22,5 +22,7 @@ option('custom-terminfo-install-location', type: 'string', value: '',
option('systemd-units-dir', type: 'string', value: '',
description: 'Where to install the systemd service files (absolute path). Default: ${systemduserunitdir}')
option('default-utempter-path', type: 'string', value: '',
description: 'Default path to utempter helper binary. Default: auto-detect')
option('utmp-backend', type: 'combo', value: 'auto', choices: ['none', 'libutempter', 'ulog', 'auto'],
description: 'Which utmp logging backend to use. This affects how (with what arguments) the utmp helper binary (see \utmp-default-helper-path\')is called. Default: auto (linux=libutempter, freebsd=ulog, others=none)')
option('utmp-default-helper-path', type: 'string', value: 'auto',
description: 'Default path to the utmp helper binary. Default: auto-detect')