usage() {

echo "Usage: $0 [srctree]" >&2

exit 1

}

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

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

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

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