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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.
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