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#!/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 $auto_top -a -d .git; then
desired_branch=`git rev-parse --abbrev-ref HEAD | tr / %`
if test "$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_branch
fi
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