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#!/bin/sh
# Updates the age-file cgit reads for the idle column. The path below is the
# default age-file, so a cgitrc that changes the setting needs the same change
# here. To install the hook, copy or link it to hooks/post-receive in each
# repository.
set -eu
# The pushing user's umask decides the mode of a freshly written agefile, so
# force one that leaves the file readable by the web server.
umask 022
agefile="$(git rev-parse --git-dir)"/info/web/last-modified
# Committer dates rather than author dates, so a push of rebased or imported
# history still counts as recent activity. Branch tips only, since an annotated
# tag carries no committer date of its own and would sort in as an empty line.
date="$(git for-each-ref --sort=-committerdate --count=1 \
--format='%(committerdate:iso8601)' refs/heads/)"
# A repository with no branches keeps whatever cgit already had, rather than
# being handed an empty file.
test -n "$date" || exit 0
mkdir -p "$(dirname "$agefile")"
# Write through a temporary file so a reader never sees a half written date.
tmpfile="$agefile.$$"
trap 'rm -f "$tmpfile"' EXIT
printf '%s\n' "$date" >"$tmpfile"
mv "$tmpfile" "$agefile"
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