#!/bin/sh

AWK=${AWK:-awk}
GIT=${GIT:-git}
GREP=${GREP:-grep}
SED=${SED:-sed}


if [ -f ${1}/.version ]; then
    cat ${1}/.version
elif [ -d ${1}/.svn ]; then
    PARTS=`LANG=C svn info ${1} | ${GREP} URL | ${AWK} '{print $2;}' | ${SED} -e 's:^.*/svn/asterisk/::' | ${SED} -e 's:/: :g'`
    BRANCH=0
    TEAM=0
    TAG=0
    FEATURE=0

    REV=`svnversion -c ${1} | cut -d: -f2`

    INTEGRATED=`LANG=C svn pg automerge-propname ${1}`
    if [ -z "${INTEGRATED}" ] ; then
        INTEGRATED=svnmerge-integrated
    fi

    BASE=`LANG=C svn pg ${INTEGRATED} ${1} | cut -d: -f1`

    if [ "${PARTS}" = "trunk" ] ; then
        echo SVN-trunk-r${REV}
        exit 0
    fi

    for PART in $PARTS ; do
        if [ ${TAG} != 0 ] ; then
            if [ "${PART}" = "autotag_for_be" ] ; then
                continue
            fi
            if [ "${PART}" = "autotag_for_sx00i" ] ; then
                continue
            fi
            RESULT="${PART}"
            break
        fi

        if [ ${BRANCH} != 0 ] ; then
            RESULT="${RESULT}-${PART}"
            if [ ${FEATURE} != 0 ] ; then
                RESULT="${RESULT}-${FEATURE_NAME}"
            fi
            break
        fi

        if [ ${TEAM} != 0 ] ; then
            if [ -z "${RESULT}" ] ; then
                RESULT="${PART}"
            else
                RESULT="${RESULT}-${PART}"
            fi
            continue
        fi

        if [ "${PART}" = "certified" ] ; then
            FEATURE=1
            FEATURE_NAME="cert"
            continue
        fi

        if [ "${PART}" = "branches" ] ; then
            BRANCH=1
            RESULT="branch"
            continue
        fi

        if [ "${PART}" = "tags" ] ; then
            TAG=1
            continue
        fi

        if [ "${PART}" = "team" ] ; then
            TEAM=1
            continue
        fi
    done

    if [ ${TAG} != 0 ] ; then
        echo ${RESULT}
    else
        echo SVN-${RESULT}-r${REV}${BASE:+-${BASE}}
    fi
elif [ -d ${1}/.git ]; then
    if [ -z ${GIT} ]; then
        GIT="git"
    fi

    if ! command -v ${GIT} >/dev/null 2>&1; then
        echo "UNKNOWN__and_probably_unsupported"
        exit 1
    fi

    GITCHECK=$(${GIT} describe --always 2>/dev/null || echo gitfail 2>/dev/null)
    if [ "x${GITCHECK}" = "xgitfail" ]; then
        echo "UNKNOWN__git_check_fail"
        exit 1
    fi

    cd ${1}

    # If the first log commit messages indicates that this is checked into
    # subversion, we'll just use the SVN- form of the revision.
    MODIFIED=""
    SVN_REV=`${GIT} log --pretty=full -1 | ${SED} -n '/git-svn-id:/ s/.*\@\([^ ]*\) .*/\1/p'`
    if [ -z "$SVN_REV" ]; then
        # If MAINLINE_BRANCH is already set in the environment, use it.
        if [ -z "${MAINLINE_BRANCH}" ] ; then
            # Try to retrieve MAINLINE_BRANCH from a local .develvars file first.
            # .develvars is keyed by the branch name so we need to get that first.
            BRANCH=$(${GIT} symbolic-ref --short HEAD)
            if [ -f .develvars ] ; then
                MAINLINE_BRANCH=$(${GIT} config -f .develvars --get branch.${BRANCH}.mainline-branch)
            fi

            # If we didn't find it, see if this is a well-known development branch.
            # development/<mainline_branch>/<branchname> or
            # devel/<mainline_branch>/<branchname>
            if [ "x${MAINLINE_BRANCH}" = "x" ] ; then
                MAINLINE_BRANCH=$(echo "${BRANCH}" | ${SED} -n -r -e "s@devel(opment)?/([0-9]+)/.+@\2@p")
            fi

            # If we didn't find it, get it from .gitreview defaultbranch.
            if [ "x${MAINLINE_BRANCH}" = "x" ] ; then
                MAINLINE_BRANCH=$(${GIT} config -f .gitreview --get gerrit.defaultbranch)
            fi
        fi

        VERSION=`${GIT} describe --long --always --tags --dirty=M 2> /dev/null`
        if [ $? -ne 0 ]; then
            if [ "`${GIT} ls-files -m | wc -l`" != "0" ]; then
                MODIFIED="M"
            fi
            # Some older versions of git do not support all the above
            # options.
            VERSION=`${GIT} rev-parse --short --verify HEAD`${MODIFIED}
        fi
        echo GIT-${MAINLINE_BRANCH}-${VERSION}
    else
        PARTS=`LANG=C ${GIT} log --pretty=full | ${GREP} -F "git-svn-id:" | head -1 | ${AWK} '{print $2;}' | ${SED} -e s:^.*/svn/$2/:: | ${SED} -e 's:/: :g' | ${SED} -e 's/@.*$//g'`
        BRANCH=0
        TEAM=0
        TAG=0
        FEATURE=0

        if [ "`${GIT} ls-files -m | wc -l`" != "0" ]; then
            MODIFIED="M"
        fi

        for PART in $PARTS ; do
            if [ ${TAG} != 0 ] ; then
                if [ "${PART}" = "autotag_for_be" ] ; then
                    continue
                fi
                if [ "${PART}" = "autotag_for_sx00i" ] ; then
                    continue
                fi
                RESULT="${PART}"
                break
            fi

            if [ ${BRANCH} != 0 ] ; then
                RESULT="${RESULT}-${PART}"
                if [ ${FEATURE} != 0 ] ; then
                    RESULT="${RESULT}-${FEATURE_NAME}"
                fi
                break
            fi

            if [ ${TEAM} != 0 ] ; then
                if [ -z "${RESULT}" ] ; then
                    RESULT="${PART}"
                else
                    RESULT="${RESULT}-${PART}"
                fi
                continue
            fi

            if [ "${PART}" = "certified" ] ; then
                FEATURE=1
                FEATURE_NAME="cert"
                continue
            fi

            if [ "${PART}" = "branches" ] ; then
                BRANCH=1
                RESULT="branch"
                continue
            fi

            if [ "${PART}" = "tags" ] ; then
                TAG=1
                continue
            fi

            if [ "${PART}" = "team" ] ; then
                TEAM=1
                continue
            fi

            if [ "${PART}" = "trunk" ]; then
                echo SVN-trunk-r${SVN_REV}${MODIFIED}
                exit 0
            fi
        done

        if [ ${TAG} != 0 ] ; then
            echo ${RESULT}
        else
            echo SVN-${RESULT##-}-r${SVN_REV}${MODIFIED}
        fi
    fi
else
    echo "UNKNOWN__and_probably_unsupported"
fi
