mesa/bin/extract_git_sha1

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#!/bin/sh
if [ ! -f src/mesa/main/git_sha1.h ]; then
touch src/mesa/main/git_sha1.h
fi
if [ ! -d .git ]; then
exit
fi
if which git > /dev/null; then
# Extract the 7-digit "short" SHA1 for the current HEAD, convert
# it to a string, and wrap it in a #define. This is used in
# src/mesa/main/version.c to put the GIT SHA1 in the GL_VERSION string.
git log -n 1 --oneline |\
sed 's/^\([^ ]*\) .*/#define MESA_GIT_SHA1 "git-\1"/' \
> src/mesa/main/git_sha1.h.tmp
if ! cmp -s src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h; then
mv src/mesa/main/git_sha1.h.tmp src/mesa/main/git_sha1.h
fi
fi