git/git-sh-setup-script

#!/bin/sh
#
# Set up GIT_DIR and GIT_OBJECT_DIRECTORY
# and return true if everything looks ok
#
: ${GIT_DIR=.git}
: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}

die() {
	echo "$@" >&2
	exit 1
}

[ -h "$GIT_DIR/HEAD" ] &&
[ -d "$GIT_DIR/refs" ] &&
[ -d "$GIT_OBJECT_DIRECTORY/00" ]