#!/bin/bash

# ts 2011.06.27
# Test the correct handling of hardlinks by xorriso options
# -update_r , -hardlinks perform_update , and -extract

. inc/releng_getopts.inc

if [ ! -x $RELENG_XORRISO ]; then
 print_help
 printf "\n${SELF}: -x  absolute or relative path to binary to be run.\n\n"
 exit 31
fi

# check data dir, if any and after checking -x xorriso
if [ -d "${GEN_DATA_DIR}" ]; then
 printf "\n${SELF}: directory %s exists!" ${GEN_DATA_DIR}
 printf "\n${SELF}: use '${SELF} -c1' to remove.\n"
 exit 8
else
 mkdir "${GEN_DATA_DIR}"
fi

export xorriso=${RELENG_XORRISO}
export workdir=${GEN_DATA_DIR}
export image_file="$workdir"/xorriso_hardlinks.iso
export on_disk="$workdir"/xorriso_hardlinks_test_dir
export in_iso=""
export copy_on_disk="$workdir"/xorriso_hardlinks_copy_dir
export failure=0
export simulate_failure=${SIMULATE_FAILURE}
export next_is_xorriso=0
export next_is_rc=0
export bad=0
export report_about="-report_about UPDATE"

test -z "$in_iso" && in_iso="$on_disk"

# mkdir "$workdir" || bad=1
mkdir "$on_disk" || bad=1
if test "$bad" = 1
then
  echo -e "\n${SELF}: FAIL : Test environment error : Cannot make directories"
  exit 3
fi

# All must be set at this point
printf "\n${SELF}: Setting up $on_disk with several hardlinks" >&2
echo test_content >"$on_disk"/file_1 || exit 1
echo test_content >"$on_disk"/file_2 || exit 1
ln "$on_disk"/file_1 "$on_disk"/file_1_link_a || exit 1
ln "$on_disk"/file_1 "$on_disk"/file_1_link_b || exit 1
ln "$on_disk"/file_2 "$on_disk"/file_2_link_a || exit 1
ls -l "$on_disk"/*

# trivial ISO 9660 image validation routine
is_valid_iso9660() {
 ISOfile="$1"
 if [ ! -f ${ISOfile} ]; then
   failure=1
   printf "\n${SELF}: FAIL: Not found: ${ISOfile}\n"
 fi
 if file ${ISOfile} | grep -P "ISO\s+9660\s+CD-ROM\s+filesystem\s+data" >/dev/null 2>&1; then
   printf "\n${SELF}: Resulting ${ISOfile} OK. Looks like ISO 9660 filesystem.\n"
 else
   failure=1
   printf "\n${SELF}: FAIL: ${ISOfile} DOES NOT look like ISO 9660 filesystem data.\n"
 fi
}

echo -e "\n${SELF}: Producing simple image via -o" >&2
"$xorriso" -as mkisofs "$on_disk" -o      "$workdir"/image_minus_o.iso
is_valid_iso9660                          "$workdir"/image_minus_o.iso
echo -e "\n${SELF}: Producing simple image via redirect" >&2
"$xorriso" -as mkisofs "$on_disk" >       "$workdir"/image_redirected.iso
is_valid_iso9660                          "$workdir"/image_redirected.iso
echo -e "\n${SELF}: Producing simple image via pipe" >&2
"$xorriso" -as mkisofs "$on_disk" | cat > "$workdir"/image_piped.iso
is_valid_iso9660                          "$workdir"/image_piped.iso

echo -e "\n${SELF}: Producing simple image with for_backup/update_r/hardlinks" >&2
"$xorriso" \
  $report_about \
  -version \
  -for_backup \
  -padding 0 \
  -outdev "$image_file" \
  -update_r "$on_disk" "$in_iso" \
  -hardlinks perform_update
is_valid_iso9660                         "$image_file"

echo -e "\n${SELF}: Copying from image to temporary disk tree" >&2
"$xorriso" \
  $report_about \
  -for_backup \
  -indev "$image_file" \
  -osirrox on \
  -find "$in_iso" -exec lsdl -- \
  -extract "$in_iso" "$copy_on_disk"


if test "$simulate_failure" = 1
then
  echo -e "\n${SELF}: SIMULATING FAILURE BY REMOVING AN EXTRACTED FILE" >&2
  echo -e "\n${SELF}: FAIL : Simulated failure caused by option -fail"
  rm "$copy_on_disk"/file_1_link_b
fi


printf "\n${SELF}: Comparing original disk tree and temporary one..." >&2
diff -r "$on_disk" "$copy_on_disk"
if test "$?" -ne 0
then
  echo -e "\n${SELF}: FAIL : diff -r $on_disk $copy_on_disk   reports differences" >&2
  echo -e "\n${SELF}: FAIL : diff -r reports differences"
  failure=1
else
  printf "OK" >&2
fi

printf "\n${SELF}: Checking for hardlinks being siblings...\n"
ls -l "$copy_on_disk"/*
x=$(echo $(ls -l "$copy_on_disk"/* | awk '{print $2}'))
expected="3 3 3 2 2"
if test x"$x" = x"$expected"
then
  printf "\n${SELF}: Checking for hardlinks being siblings. Done. OK.\n" >&2
else
  printf "\n${SELF}: FAIL : Link count of extracted files is not as expected." >&2
  printf "\n${SELF}: Expected:  $expected" >&2
  printf "\n${SELF}: Got     :  $x\n" >&2
  failure=1
fi

#
cleanup

# Report result
echo 
if test "$failure" = 1
then
  printf "${SELF}: FAILED"
  echo 
  exit 1
else
  printf "${SELF}: Passed"
  echo 
fi

exit 0