toybox-clone/tests/losetup.test

#!/bin/bash

[ -f testing.sh ] && . testing.sh

if [ "$(id -u)" -ne 0 ]; then
  echo "$SHOWSKIP: losetup (not root)"
  return 2>/dev/null
  exit
fi

if [ "$(losetup -a | wc -l)" -ne 0 ]; then
  echo "$SHOWSKIP: losetup (devices already in use)"
  return 2>/dev/null
  exit
fi

# Android's loopback devices are only in /dev/block/loop*.
# Debian has symlinks like /dev/block/7:0 back to ../loop*.
if [ -b /dev/block/sda ]; then
  DIR="/dev/block" # Presumably Android.
else
  DIR="/dev"
fi

#testing "name" "command" "result" "infile" "stdin"

truncate -s 1M blah.img &&
FILE="$(readlink -f blah.img)"
DEV="$(stat --format %d blah.img)"
NODE="$(stat --format %i blah.img)"

# TODO: assumes there are no loopback devices!
testcmd "-f" "-f" "$DIR/loop0\n" "" ""
testcmd "-f blah.img" "-f blah.img" "" "" ""
testcmd "-f --show" "-f --show blah.img" "$DIR/loop1\n" "" ""
testcmd "-a" "-a | sort" \
  "$DIR/loop0: [$DEV]:$NODE ($FILE)\n$DIR/loop1: [$DEV]:$NODE ($FILE)\n" "" ""
testcmd "-d $DIR/loop0" "-d $DIR/loop0 && losetup -a" \
  "$DIR/loop1: [$DEV]:$NODE ($FILE)\n" "" ""
testcmd "-D" "-D && losetup -a" "" "" ""

rm blah.img