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#!/bin/sh
#
# Example hook that drops cgit's output cache after a push, so new commits
# show up right away instead of once the cache-*-ttl minutes have passed.
#
# This only matters when cache-size in your cgitrc is above 0, which turns
# the cache on.
#
# cgit names each cache slot after a hash of the request url, so there is no
# way to expire one repository's pages on their own and this clears the lot.
# cgit refills a slot the next time something asks for it. The cached
# repository scan goes too, which is what makes a brand new repository appear
# without waiting out cache-scan-ttl.
#
# This hook assumes the default cache-root of "/var/cache/cgit". If you
# change the value in your cgitrc then you must also change it here.
#
# The web server owns the cache root, so the pushing user needs write access
# to it. Nothing here exits nonzero when that access is missing, so the
# pusher is not shown an error over a stale page.
#
# To install the hook, copy (or link) it to the file "hooks/post-receive" in
# each of your repositories. Git runs one post-receive per repository, so
# fold this together with the agefile hook if you want both.
#
set -eu
cache_root=/var/cache/cgit
[ -d "$cache_root" ] || exit 0
# Everything directly under the cache root is a cache file, so the only thing
# worth keeping is the lock files, which belong to writers still working.
# The "! -name . -prune" pair is how POSIX find stays out of subdirectories.
find "$cache_root"/. ! -name . -prune ! -name '*.lock' -type f -exec rm -f {} + || exit 0
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