QA:Testcase squashfs-tools compression

Description

Test that compression is reversible for squashfs-tools.

How to test

1. You need to have squashfs-tools and rpmdevtools installed.
2. Run the provided script as root and note any failure messages. The script needs to be run as root so that squashfs images can be mounted and to prevent warnings about setting selinux extended attributes when running unsquashfs.

The compression types tested will be those expected to work with the version of squashfs-tools you have installed and the kernel you are running.

The script will create a directory in the current working directory named "test-squashfs". When run, the script will check if "test-squashf/data" is already created and if so won't recreate the test data.

#!/bin/bash

# We need rpmdev-vercmp
rpm -q rpmdevtools > /dev/null 2>&1 || (echo 'rpmdev-vercmp from rpmdevtools is needed to run this script, aborting.'; exit 1)

# Define block sizes
blocks=(4K 1M)

# Define fill files
fill=(/dev/zero /dev/urandom)

# Define number of iterations
iter=5

# Define fragment sizes
frags=(0 1 2047 4095)

# Define test directory
testdir=./test-squashfs

# Define mount point
mp=${testdir}/mnt

# Define data directory
datadir=${testdir}/data

# Check for squashfs-tools version and set compression types to test
sqfsver=`rpm -q --qf '%{EVR}' squashfs-tools`
if rpmdev-vercmp 4.1 ${sqfsver} > /dev/null; [ $? == '11' ]; then
  ucomp=('gzip')
elif rpmdev-vercmp 4.2 ${sqfsver} > /dev/null; [ $? == '11' ]; then
  ucomp=(gzip lzo lzma)
else
  ucomp=(gzip lzo lzma xz)
fi

# Check for kernel verion and set mount test compression types
kernel=`uname -r`
if rpmdev-vercmp 2.6.36 ${kernel} > /dev/null; [ $? == '11' ]; then
  mcomp=('gzip')
elif rpmdev-vercmp 2.6.38 ${kernel} > /dev/null; [ $? == '11' ]; then
  mcomp=(gzip lzo)
else
  mcomp=(gzip lzo xz)
fi

# Check for uid 0 and print a warning if not
[ ${UID} -ne 0 ] && echo 'Mount tests will not be performed when not running as root'

# Check if test directory exists and make if not
[ -d ${testdir} ] || mkdir ${testdir}
[ -d ${testdir} ] || (echo "Unable to make '${testdir}', aborting."; exit 1)

# Check if mount point directory exists and make if not
[ -d ${mp} ] || mkdir ${mp}
[ -d ${mp} ] || (echo "Unable to make '${mp}', aborting."; exit 1)

# Check if data directory exists and make if not
if [ -d ${datadir} ]; then
  echo "Using existing data directory."
else
  echo "Building data directory."
  mkdir ${datadir}
  [ -d ${datadir} ] || (echo "Unable to make '${datadir}', aborting."; exit 1)
  for size in ${frags[*]}; do
    for file in ${fill[*]}; do
      dd if=${file} of=${datadir}/frag-`basename ${file}`-${size} bs=1 count=${size} > /dev/null 2>&1
    done
  done
  for size in ${blocks[*]}; do
    for ((count=1;${count}<=${iter};count++)); do
      for file in ${fill[*]}; do
        dd if=${file} of=${datadir}/file-`basename ${file}`-${size}-${count} bs=${size} count=${count} > /dev/null 2>&1
      done
    done
  done
  for size1 in ${frags[*]}; do
    for file1 in ${fill[*]}; do
      for size2 in ${blocks[*]}; do
        for ((count=1;${count}<=${iter};count++)); do
          for file2 in ${fill[*]}; do
            cat ${datadir}/file-`basename ${file2}`-${size2}-${count} ${datadir}/frag-`basename ${file1}`-${size1} > ${datadir}/combined-`basename ${file2}`-${size2}-${count}-`basename ${file1}`-${size1}
          done
        done
      done
    done
  done
fi

# Run unmounted tests
for comp in ${ucomp[*]}; do
  echo "Building squashfs image using ${comp} compression."
  if [ "${comp}" == gzip ]; then
    mksquashfs ${datadir} ${testdir}/sq.img || (echo "mksquashfs failed for ${comp} compression."; continue)
  else
    mksquashfs ${datadir} ${testdir}/sq.img -comp ${comp} || (echo "mksquashfs failed for ${comp} compression."; continue)
  fi
  echo "Testing unmounted extract using ${comp} compression."
  unsquashfs -d ${testdir}/sq ${testdir}/sq.img  || echo "unsquashfs failed for ${comp} compression."
  diff -r -q ${testdir}/sq ${datadir} || echo "Extract test failed for ${comp} compression."
  rm -rf ${testdir}/sq
  if [ ${UID} == 0 ]; then
    for kern in ${mcomp[*]}; do
      if [ ${kern} == ${comp} ]; then
        echo "Testing mounted image using ${comp} compression."
        mount -r -o loop ${testdir}/sq.img ${mp} || echo "Mount failed.";
        diff -r -q ${mp} ${datadir} || echo "Mounted test failed for ${comp} compression."
        umount ${mp}
        break
      fi
    done
  fi
  rm -f ${testdir}/sq ${testdir}/sq.img
done

Expected Results

1. The test should not abort early because it was unable to create some file or free disc space running out. There should be no messages with the string "failed" in them. Typically you might run this using script and then grep "typescript" for "failed".