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#!/bin/sh
# version -- print slosh's version string, derived from git tags with ./VERSION
# as the floor (and the answer when there is no git at all).
#
# One script, so a build, the artifact it is packaged into, and the string the
# binary prints for `--version` can never disagree: the main Makefile bakes it
# in, Makefile.macos names the signed zip with it, and the release target names
# the linux tarballs with it. The ladder:
#
# on a tag v0.2.0 -> 0.2.0
# past a tag v0.2.0-5-gabc123 -> 0.2.0-5-gabc123 (sorts after 0.2.0)
# before any tag <VERSION>-<count>-g<short> (+ -dirty if dirty)
# no .git at all <VERSION> (verbatim)
#
# ./VERSION is the committed floor and the only value a source tarball without
# git can show -- a cgit snapshot, which is how Homebrew builds from source. The
# commit count is in the tag-less form so `brew upgrade` sees a later build as
# later: without it 0.1.0-gabc123 vs 0.1.0-gdef456 would sort alphabetically,
# which has nothing to do with which came first.
set -eu
root="$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)"
base="$(cat "$root/VERSION" 2>/dev/null || echo 0.0.0)"
if git -C "$root" rev-parse --git-dir >/dev/null 2>&1; then
d="$(git -C "$root" describe --tags --match 'v[0-9]*' --dirty 2>/dev/null || true)"
if [ -n "$d" ]; then
printf '%s\n' "${d#v}"
else
count="$(git -C "$root" rev-list --count HEAD 2>/dev/null || echo 0)"
short="$(git -C "$root" rev-parse --short=8 HEAD 2>/dev/null || echo unknown)"
dirty=""; git -C "$root" diff --quiet 2>/dev/null || dirty="-dirty"
printf '%s-%s-g%s%s\n' "$base" "$count" "$short" "$dirty"
fi
else
printf '%s\n' "$base"
fi
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