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core: Execute first boot presets in an enable-only preset-mode.

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This means any existing enabled units well be preserved and no
pre-created symlinks will be removed. This is done on first boot, when
the assumption is that /etc is not populated at all (no machine-id
setup). For minimal containers that gives a significant first boot
speed up, approximately ~20ms / ~16% in my trials.
This commit is contained in:
Dimitri John Ledkov 2015-05-15 11:44:22 +01:00 committed by Lennart Poettering
parent fe0272999c
commit 304b3079a2
2 changed files with 1 additions and 5 deletions
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4
TODO
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@ -149,10 +149,6 @@ Features:
that are not supported...
http://lists.freedesktop.org/archives/systemd-devel/2015-February/028076.html
* PID 1: when invoking systemctl preset-all on first boots, operate in
an exclusively additive way, i.e. never remove any pre-existing
symlinks, only add new ones.
* Introduce $LISTEN_NAMES to complement $LISTEN_FDS, containing a
colon separated list of identifiers for the fds passed.

2
src/core/main.c
View File

@ -1618,7 +1618,7 @@ int main(int argc, char *argv[]) {
bump_rlimit_nofile(&saved_rlimit_nofile);
if (empty_etc) {
r = unit_file_preset_all(UNIT_FILE_SYSTEM, false, NULL, UNIT_FILE_PRESET_FULL, false, NULL, 0);
r = unit_file_preset_all(UNIT_FILE_SYSTEM, false, NULL, UNIT_FILE_PRESET_ENABLE_ONLY, false, NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to populate /etc with preset unit settings, ignoring: %m");
else