The hook substituted `simple_style: auto`, a line that only exists in SearXNG's
full bundled settings.yml. The file generated here is the minimal
`use_default_settings: true` form with no ui: block at all, so the sed matched
nothing and the theme setting had never taken effect on any install.
It could not have worked even with the right pattern: the entrypoint chowns
settings.yml to searxng:searxng (uid 977) mode 644 on first start, so the
host-side docker user cannot write to it. The edit now runs inside the
container via docker exec, targeting the real key path
ui.theme_args.simple_style.
Three shapes are handled so the hook stays correct on repeat installs and
alongside hand edits: substitute in place when simple_style already exists,
nest theme_args inside an existing ui: block rather than appending a second one
(a duplicate YAML key SearXNG refuses to load), and otherwise append the whole
block. All three were exercised against the running container and produce valid
YAML with exactly one ui: block. awk rather than `sed a\` for the nesting case,
since busybox sed does not expand \n in appended text.
The value is validated against auto|light|dark|black before being written.
SearXNG checks it at startup and exits on anything else, so an unrecognised
CFG_SEARXNG_THEME would have taken the app down instead of merely looking
wrong; it is now reported and the default left alone.
Verified end to end on a base install and a --local instance: both come up,
serve 200, and report Dark as the selected style on /preferences, each with its
own settings.yml and secret_key. The instance's cloned hook correctly reads
CFG_SEARXNG_PROBE_THEME and targets its own container, since the container name
is built from $app_name. Both test installs were removed afterwards.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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