File: git-hash.sh

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#! /bin/sh
##
## Copyright (c) 2011 The University of Utah
## All rights reserved.
##
## This file is distributed under the University of Illinois Open Source
## License.  See the file COPYING for details.
##

###############################################################################

# git-hash.sh: Return the short git hash for a source tree
#
# usage: git-hash.sh [dir]
#
# This script is intended to be invoked from `make' so that one can insert the
# current git commit hash into compiled programs.  The command-line argument
# should identify the source tree to be checked.  If it is not provided, the
# current directory is assumed to identify the source tree.

###############################################################################

## METHOD 1: The source tree is the result of `git archive'.

# `git archive' inserts the abbreviated hash of the archive's commit into this
# script.  (See the `.gitattributes' file.)
git_hash='$Format:%h$'

if test "${git_hash}" != '$''Format:%h$'; then
  echo "${git_hash}"
  exit 0
fi

###############################################################################

## METHOD 2: The source tree is a git repository.

case $# in
  0) ;;
  1) if test ! -d "$1"; then
       echo "error"
       exit 1
     fi
     cd "$1"
     if test $? -eq 1; then
       echo "error"
       exit 1
     fi;;
  *) echo "error"
     exit 1;;
esac

git_hash=`git show -s --format=%h . 2>/dev/null`
if test $? -eq 0; then
  echo "${git_hash}"
  exit 0
fi

###############################################################################

## METHOD 3: Give up.

echo "unknown"
exit 0

###############################################################################

# End of file.