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#!/bin/sh
self=watch-git-tags
# List sorted local tags
lt() {
git tag --list |
LC_COLLATE=C sort
}
# List sorted remote tags
rt() {
{ git ls-remote --quiet --refs --tags ||
printf >&2 'Failed to retrieve tags for repository %s\n' "$PWD"
} | cut -d/ -f3 | LC_COLLATE=C sort
}
# Create a temporary directory with name in $td, and handle POSIX-ish traps to
# remove it when the script exits; requires mktemp(1) (not POSIX)
td=$(mktemp -d) || exit
cleanup() {
[ -n "$td" ] || return
rm -fr -- "$td"
}
for sig in EXIT HUP INT TERM ; do
# shellcheck disable=SC2064
trap "cleanup $sig" "$sig"
done
# Use current directory if no other arguments
[ "$#" -gt 0 ] || set -- .
# Iterate through each repo in a subshell in parallel
for repo ; do (
# Make a temporary directory with a hash in its name for uniqueness
df=$(printf %s "$repo" | sed s:/:_:g)
cs=$(printf %s "$repo" | cksum)
sd=$td/$df.${cs%% *}
mkdir -- "$sd" || exit
# Step in and write repo path to file
cd -- "$sd" || exit
printf '%s\n' "$repo" > path || exit
# Write local and remote tags to files
(
cd -- "$repo" || exit
lt > "$sd"/a || exit
rt > "$sd"/b
) ||
exit
# Write new tags to file
LC_COLLATE=C comm -13 -- [ab] > new
# Attempt to quietly fetch new tags so that we don't notify about the same
# ones next time
if [ -s new ] ; then
git fetch --quiet --tags
fi
) & done
# Wait for each of those to finish
wait
# Iterate through the temp dirs in order
for dir in "$td"/* ; do (
cd -- "$dir" || exit 0
# Look for non-zero "new" files (at least one new tag)
[ -s new ] || exit 0
# Print repository path and new tags
sed '1!s/^/\t/' -- path new
exit 1
) ; done
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