guess-rev.sh

#!/bin/sh
#
# This scripts adds local version information from the version
# control systems git, mercurial (hg) and subversion (svn).
#
# Copied from Linux 2.6.32 scripts/setlocalversion and modified
# slightly to work better for OpenOCD.
#

usage() {
        echo "Usage: $0 [srctree]" >&2
        exit 1
}

cd "${1:-.}" || usage

# Check for git and a git repo.
if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then

        # If we are at a tagged commit (like "v2.6.30-rc6"), we ignore it,
        # because this version is defined in the top level Makefile.
        if [ -z "`git describe --exact-match 2>/dev/null`" ]; then

                # If we are past a tagged commit (like "v2.6.30-rc5-302-g72357d5"),
                # we pretty print it.
                if atag="`git describe 2>/dev/null`"; then
                        echo "$atag" | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'

                # If we don't have a tag at all we print -g{commitish}.
                else
                        printf '%s%s' -g $head
                fi
        fi

        # Is this git on svn?
        if git config --get svn-remote.svn.url >/dev/null; then
                printf -- '-svn%s' "`git svn find-rev $head`"
        fi

        # Update index only on r/w media
        [ -w . ] && git update-index --refresh --unmerged > /dev/null

        # Check for uncommitted changes
        if git diff-index --name-only HEAD | grep -v "^scripts/package" \
            | read dummy; then
                printf '%s' -dirty
        fi

        # All done with git
        exit
fi

# Check for mercurial and a mercurial repo.
if hgid=`hg id 2>/dev/null`; then
        tag=`printf '%s' "$hgid" | cut -d' ' -f2`

        # Do we have an untagged version?
        if [ -z "$tag" -o "$tag" = tip ]; then
                id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`
                printf '%s%s' -hg "$id"
        fi

        # Are there uncommitted changes?
        # These are represented by + after the changeset id.
        case "$hgid" in
                *+|*+\ *) printf '%s' -dirty ;;
        esac

        # All done with mercurial
        exit
fi

# Check for svn and a svn repo.
if rev=`svn info 2>/dev/null | grep '^Last Changed Rev'`; then
        rev=`echo $rev | awk '{print $NF}'`
        printf -- '-svn%s' "$rev"

        # All done with svn
        exit
fi

# There's no reecognized repository; we must be a snapshot.
printf -- '-snapshot'