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#!/usr/bin/env bash
export LANG=C
export LC_ALL=C
[ -n "$TOPDIR" ] && cd $TOPDIR
GET_REV=$1
try_version() {
[ -f version ] || return 1
REV="$(cat version)"
[ -n "$REV" ]
}
try_git() {
git rev-parse --git-dir >/dev/null 2>&1 || return 1
[ -n "$GET_REV" ] || GET_REV="HEAD"
case "$GET_REV" in
r*)
GET_REV="$(echo $GET_REV | tr -d 'r')"
BASE_REV="$(git rev-list reboot..HEAD --count)"
REV="$(git rev-parse HEAD~$((BASE_REV - GET_REV)))"
;;
*)
UPSTREAM_BASE="$(git merge-base $GET_REV origin/master)"
UPSTREAM_REV="$(git rev-list reboot..$UPSTREAM_BASE --count)"
REV="$(git rev-list reboot..$GET_REV --count)"
if [ -n "$REV" -a -n "$UPSTREAM_REV" -a "$REV" -gt "$UPSTREAM_REV" ]; then
REV="r${UPSTREAM_REV}+$((REV - UPSTREAM_REV))"
else
REV="${REV:+r$REV}"
fi
;;
esac
[ -n "$REV" ]
}
try_hg() {
[ -d .hg ] || return 1
REV="$(hg log -r-1 --template '{desc}' | awk '{print $2}' | sed 's/\].*//')"
REV="${REV:+r$REV}"
[ -n "$REV" ]
}
try_version || try_git || try_hg || REV="unknown"
echo "$REV"
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