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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 "$REV" ]
}
try_git() {
REBOOT=ee53a240ac902dc83209008a2671e7fdcf55957a
git rev-parse --git-dir >/dev/null 2>&1 || return 1
[ -n "$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 2>/dev/null | wc -l | awk '{print $1}')"
[ $((BASE_REV - GET_REV)) -ge 0 ] && REV="$(git rev-parse HEAD~$((BASE_REV - GET_REV)))"
;;
*)
BRANCH="$(git rev-parse --abbrev-ref HEAD)"
ORIGIN="$(git rev-parse --verify --symbolic-full-name ${BRANCH}@{u} 2>/dev/null)"
[ -n "$ORIGIN" ] || ORIGIN="$(git rev-parse --verify --symbolic-full-name master@{u} 2>/dev/null)"
REV="$(git rev-list ${REBOOT}..$GET_REV 2>/dev/null | wc -l | awk '{print $1}')"
if [ -n "$ORIGIN" ]; then
UPSTREAM_BASE="$(git merge-base $GET_REV $ORIGIN)"
UPSTREAM_REV="$(git rev-list ${REBOOT}..$UPSTREAM_BASE 2>/dev/null | wc -l | awk '{print $1}')"
else
UPSTREAM_REV=0
fi
if [ "$REV" -gt "$UPSTREAM_REV" ]; then
REV="${UPSTREAM_REV}+$((REV - UPSTREAM_REV))"
fi
REV="${REV:+r$REV-$(git log -n 1 --format="%h" $UPSTREAM_BASE)}"
;;
esac
[ -n "$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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