#!/bin/sh
  #
  # This scripts adds local version information from the version
  # control systems git, mercurial (hg) and subversion (svn).
  #
  # If something goes wrong, send a mail the kernel build mailinglist
  # (see MAINTAINERS) and CC Nico Schottelius
  # <nico-linuxsetlocalversion -at- schottelius.org>.
  #
  #
  
  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=`LC_ALL=C 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