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#
#   Receive a file and save is locally
#   Script run by ssh to receive a compressed file and to save it
#   Works in bash and dash
#
#   Assumes that gzip output as stdin
#
#set -x
set -e

error() {
    echo ERROR: $*
    exit 1;
}

# User options
while getopts D arg ; do
    case $arg in
        D) set -x ;;
        *) error Unknown option: $arg ;;
    esac
done
shift $(($OPTIND - 1))

# User arguments
fname=${1:?Need file name}

dpkg="dpkg_archive"
[ -d $dpkg ] || error dpkg_archive not found

#
#   Names of working directories
#
metadir="$dpkg/.dpkg_archive"
tmpfile="$metadir/${fname}.NEWTMP"
newfile="$metadir/${fname}"

#
#   Create package metadata directory
#   Ensure its writable
mkdir -p "$metadir"
chmod u+w "$metadir"

#
#   unzip the file into a temp name
gunzip -c -d -- > "$tmpfile"

#
#   Now that the new file has arrived error free
#   Rename the temp file to the new file
#

chmod a+w "$newfile" || true
rm -f "$newfile"
mv "$tmpfile" "$newfile"

# Fix up permissions on the file and directory
chmod a-w "$newfile"
chmod go-w "$metadir"
chmod a+rx "$metadir"