Ticket #3147: usqfs

#! /bin/sh
#
# Squash file system
#
# tested to comply with unsquashfs version 4.2 (2011/02/28)'s output

SQUASHFS=unsquashfs
GAWK=gawk
MV=mv
RM=rm

mcsqfs_list ()
{
  $SQUASHFS -d "" -lls "$1" | $GAWK '
    {
      if (NR < 5)
        next
      split($2, a, "/")
      split($4, b, "-")
      if (NF < 7)
        printf "%10s   1 %8s %8s %8s %2s-%2s-%4s %5s %s\n", $1, a[1], a[2], $3, b[2], b[3], b[1], $5, $6
      else
        printf "%10s   1 %8s %8s %8s %2s-%2s-%4s %5s %s %s %s\n", $1, a[1], a[2], $3, b[2], b[3], b[1], $5, $6, $7, $8
    }' 2>/dev/null
}

# permission user group         size date        time filename -  symlinktarget
# lrwxrwxrwx root/root             2 2013-12-31 12:50 /foolink -> foo
#         $1 a[1] a[2]            $3 b[1]b[2]b[3]  $5       $6 $7 $8

# AAAAAAAAAA NNN OOOOOOOO GGGGGGGG SSSSSSSS DATETIME [PATH/]FILENAME [-> [PATH/]FILENAME[/]]]
#
# where (things in [] are optional):
#
# AAAAAAAAAA is the permission string like in ls -l
# NNN        is the number of links
# OOOOOOOO   is the owner (either UID or name)
# GGGGGGGG   is the group (either GID or name)
# SSSSSSSS   is the file size
# FILENAME   is the filename
# PATH       is the path from the archive's root without the leading slash (/)
# DATETIME   has one of the following formats:
#            Mon DD hh:mm, Mon DD YYYY, Mon DD YYYY hh:mm, MM-DD-YYYY hh:mm
#
#            where Mon is a three letter English month name, DD is day 1-31,
#            MM is month 01-12, YYYY is four digit year, hh is hour and
#            mm is minute.
#
# If the -> [PATH/]FILENAME part is present, it means:
#
# If permissions start with an l (ell), then it is the name that symlink
# points to. (If this PATH starts with a MC vfs prefix, then it is a symlink
# somewhere to the other virtual filesystem (if you want to specify path from
# the local root, use local:/path_name instead of /path_name, since /path_name
# means from root of the archive listed).
#
# If permissions do not start with l, but number of links is greater than one,
# then it says that this file should be a hardlinked with the other file.

mcsqfs_copyout ()
{
  $SQUASHFS "$1" "$2" >/dev/null
  $MV squashfs-root/$2 $3
  $RM -rf squashfs-root
}

umask 077

cmd="$1"
shift
case "$cmd" in
  list) mcsqfs_list "$@" ;;
  copyout) mcsqfs_copyout "$@" ;;
  *) exit 1 ;;
esac
exit 0