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#! /bin/sh
#
# extfs support for p7zip
# Written by Pavel Roskin <proski@gnu.org>
# Some Bugfixes/workarounds by Sergiy Niskorodov <sgh@mail.zp.ua>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

P7ZIP=`which 7z 2>/dev/null` || P7ZIP=`which 7za 2>/dev/null` || P7ZIP=`which 7zr 2>/dev/null` || P7ZIP=""

# Let the test framework hook in:
P7ZIP=${MC_TEST_EXTFS_LIST_CMD:-$P7ZIP}
STAT=${MC_TEST_EXTFS_U7Z_STAT:-stat}

mcu7zip_list ()
{
        # Symlinks are not shown - no idea how to distinguish them
        # Read-only files are not shown as such - it's rarely useful

        ugid="`id -nu` `id -ng`"

        date_re='^\(....\)-\(..\)-\(..\) \(..:..:..\)' # 19 chars.
        date_mc='\2-\3-\1 \4'
        empty_date_re='^ \{19\}'

        size_re='............' # 12 chars.
        empty_size_re=' \{12\}'
        zero_size='           0'

        # archive entries can have no datetime info, 7z will use archive file datetime
        date_archive=`$STAT -c %y "$1" 2>/dev/null | sed -n "s/${date_re}.*/${date_mc}/p" 2>/dev/null`
        [ "${date_archive}"x = x ] && date_archive=`ls -lan "$1" 2>/dev/null | awk '{print $6, $7, $8}' 2>/dev/null`
        [ "${date_archive}"x = x ] && date_archive="01-01-1970 00:00:00"

        $P7ZIP l "$1" | sed -n "

                  # If the uncompressed size is missing, we copy the compressed size onto it.
                  #
                  # But first, if the compressed size is missing too, set it to zero:
                  s/^\(.\{19\} [D.]....\) $empty_size_re $empty_size_re/\1 $zero_size $zero_size/
                  # Next, do the copy:
                  s/^\(.\{19\} [D.]....\) $empty_size_re \($size_re\)/\1 \2 \2/
                  #
                  # (We use '.\{19\}' as the date may be missing. It may give false positives
                  # but we don't mind: the printing commands that follow use strict patterns.).

                  # Handle directories.
                  s/$date_re D.... $size_re $size_re\(.*\)/drwxr-xr-x 1 $ugid 0 $date_mc \5/p
            s/$empty_date_re D.... $size_re $size_re\(.*\)/drwxr-xr-x 1 $ugid 0 $date_archive \1/p

                  # Handle normal files.
                  s/$date_re \..... \($size_re\) $size_re\(.*\)/-rw-r--r-- 1 $ugid \5 $date_mc \6/p
            s/$empty_date_re \..... \($size_re\) $size_re\(.*\)/-rw-r--r-- 1 $ugid \1 $date_archive \2/p
        "
}

mcu7zip_copyout ()
{
        #first we check if we have old p7zip archive with prefix ./ in filename
        $P7ZIP l "$1" "$2" | grep -q "0 files, 0 folders" && \
        EXFNAME='*./'"$2" || EXFNAME="$2"
        $P7ZIP e -so "$1" "$EXFNAME" > "$3" 2>/dev/null
}

mcu7zip_copyin ()
{
        $P7ZIP a -si"$2" "$1" <"$3" >/dev/null 2>&1
}

mcu7zip_mkdir ()
{
        dir=`mktemp -d "${MC_TMPDIR:-/tmp}/mctmpdir-u7z.XXXXXX"` || exit 1
        mkdir -p "$dir"/"$2"
        $P7ZIP a -w"$dir" "$1" "$dir"/"$2" >/dev/null 2>&1
        rm -rf "$dir"
}

mcu7zip_rm ()
{
        # NOTE: Version 4.20 fails to delete files in subdirectories
        #first we check if we have old p7zip archive with prefix ./ in filename
        $P7ZIP l "$1" "$2" | grep -q "0 files, 0 folders" && \
        EXFNAME='*./'"$2" || EXFNAME="$2"
        $P7ZIP d "$1" "$EXFNAME" 2>&1 | grep -q E_NOTIMPL > /dev/null 2>&1 && \
        { printf "Function not implemented...\n7z cannot delete from solid archive." >&2 ; exit 1 ; }
}

mcu7zip_rmdir ()
{
        #first we check if we have old p7zip archive with prefix ./ in filename
        $P7ZIP l "$1" "$2" | grep -q "0 files, 0 folders" && \
        EXFNAME='*./'"$2" || EXFNAME="$2"
        $P7ZIP d "$1" "$EXFNAME"/ 2>&1 | grep -q E_NOTIMPL > /dev/null 2>&1 && \
        { printf "Function not implemented...\n7z cannot delete from solid archive." >&2 ; exit 1 ; }
}

# override any locale for dates
LC_DATE=C
export LC_DATE

umask 077

if [ -z "$P7ZIP" ]; then
    echo "Error: could not find p7zip (looked for 7z, 7za and 7zr)" >&2
    exit 1
fi

cmd="$1"
shift

case "$cmd" in
  list)    mcu7zip_list    "$@" | sort -k 8 ;;
  copyout) mcu7zip_copyout "$@" ;;
  copyin)  mcu7zip_copyin  "$@" ;;
  mkdir)   mcu7zip_mkdir   "$@" ;;
  rm)      mcu7zip_rm      "$@" ;;
  rmdir)   mcu7zip_rmdir   "$@" ;;
  *) exit 1 ;;
esac
exit 0