#!/bin/sh -e # This script will setup the build dir based on the current git branch and the# directory auto-build-save/$BRANCH.  We don't use a symlink for the build dir# because we want to maximize the ccache reuse, so all builds must happen in# the same real dir.  When a dir is moved out of auto-build-save/$BRANCH to the# build dir, it is replaced with a symlink so that it can still be found under# that dir.  The build dir also gets a .branch -> $BRANCH symlink so that we# can figure out the current build dir's branch. # To get started, just clone the rsync git repo and create the auto-build-save# dir.  If you have an existing git checkout and it is not in a pristine state,# run "make distclean" before creating the auto-build-save dir. auto_top='auto-build-save'if test -d $auto_top && test -d .git; then    desired_branch=`git rev-parse --abbrev-ref HEAD | tr / %`    if test "$desired_branch" = HEAD; then	echo "ERROR: switch to the right build dir manually when in detached HEAD mode." 1>&2	exit 1    fi    auto_dir="$auto_top/$desired_branch"    if test -d build; then	cur_branch=`readlink build/.branch`    else	cur_branch='/'    fi    if test "$desired_branch" != "$cur_branch"; then	if test "$cur_branch" != /; then	    rm -f "$auto_top/$cur_branch"	    mv build "$auto_top/$cur_branch"	fi	test -d "$auto_dir" || mkdir "$auto_dir"	test -h "$auto_dir/.branch" || ln -s "$desired_branch" "$auto_dir/.branch"	mv "$auto_dir" build	ln -s ../build "$auto_dir"    fi    if test ! -h Makefile; then	rm -f Makefile	ln -s packaging/auto-Makefile Makefile    fi    echo $desired_branchfi