OpenWrt – Rev 1

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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 | wc -l | awk '{print $1}')"
                REV="$(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 | 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 | 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"