#!/bin/bash
#
# Common routines for all tests
#

_fail()
{
	echo "$*" | tee -a $RESULT
	exit 1
}

_not_run()
{
	echo "    [NOTRUN] $*"
	exit 0
}

run_check()
{
	echo "############### $@" >> $RESULT 2>&1
	"$@" >> $RESULT 2>&1 || _fail "failed: $@"
}

check_prereq()
{
	if ! [ -f $top/$1 ]; then
		_fail "Failed prerequisities: $1";
	fi
}

check_image()
{
	image=$1
	echo "testing image $(basename $image)" >> $RESULT
	$top/btrfs check $image >> $RESULT 2>&1
	[ $? -eq 0 ] && _fail "btrfs check should have detected corruption"

	run_check $top/btrfs check --repair $image
	run_check $top/btrfs check $image
}

check_all_images()
{
	dir=$1
	for i in $(find $dir -iname '*.img')
	do
		echo "extracting image $(basename $i)" >> $RESULT
		$top/btrfs-image -r $i $i.restored || \
			_fail "failed to extract image $i"

		check_image $i.restored

		rm $i.restored
	done
}

# some tests need to mount the recovered image and do verifications call
# 'setup_root_helper' and then check for have_root_helper == 1 if the test
# needs to fail otherwise; using sudo by default for now
_sudo=
need_validate=-1
export _sudo
export need_validate
root_helper()
{
	if [ $UID -eq 0 ]; then
		$*
	else
		if [ $need_validate -eq 1 ]; then
			sudo -v -n &> /dev/null || \
				_not_run "Need validate sudo credential"
			sudo -n $*
		elif [ $need_validate -eq 0 ]; then
			sudo -n true  &> /dev/null || \
				_not_run "Need validate sudo user setting"
			sudo -n $*
		else
			# should not happen
			_not_run "Need validate root privilege"
		fi
	fi
}

setup_root_helper()
{
	if [ $UID -eq 0 ]; then
		return
	fi
	# Test for old sudo or special setting, which makes sudo -v fails even
	# user is set NOPASSWD
	sudo -n true &> /dev/null && need_validate=0

	# Newer sudo or default sudo setting
	sudo -v -n &> /dev/null && need_validate=1

	if [ $need_validate -eq -1 ]; then
		_not_run "Need validate root privilege"
	fi
	_sudo=root_helper
}