226 lines
4.6 KiB
Plaintext
226 lines
4.6 KiB
Plaintext
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#!/bin/sh
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# gzip-like CLI wrapper for p7zip
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# version 3.0
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#
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# History
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# 2.0 :
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# - support for -filename, "file name"
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# - p7zip file1 file2 ...
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# 3.0 : (robert@debian.org, March 2016)
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# - use 7za or 7zr, whichever one is available
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# - refactor the script for better readability
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# - remove `"$?" != 0 ' checks that do not work with `set -e'
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# - use stderr for error reporting
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# - add support for -c, -f, -k options
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set -e
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# detect 7z program to use
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prg7z="`which 7za 2>/dev/null`" || \
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prg7z="`which 7zr 2>/dev/null`" || \
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{ echo "$0: cannot find neither 7za nor 7zr command" >&2; exit 1; }
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# global options
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f_compress=true
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f_keep=false
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f_force=false
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f_tostdout=false
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usage()
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{
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echo "Usage: $0 [options] [--] [ name ... ]"
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echo ""
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echo "Options:"
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echo " -c --stdout --to-stdout output data to stdout"
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echo " -d --decompress --uncompress decompress file"
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echo " -f --force do not ask questions"
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echo " -k --keep keep original file"
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echo " -h --help print this help"
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echo " -- treat subsequent arguments as file"
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echo " names, even if they start with a dash"
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echo ""
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exit 0
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}
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has_7z_suffix()
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{
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case "$1" in
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*.7z)
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return 0
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;;
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*)
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return 1
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;;
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esac;
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}
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make_tmp_file()
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{
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P7ZIPTMP="${TMP:-/tmp}"
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mktemp "${P7ZIPTMP}/p7zip.XXXXXXXX"
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}
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check_not_a_tty()
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{
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if ! ${f_force} && ${f_compress} && tty <&1 >/dev/null ; then
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echo "$0: compressed data not written to a terminal." >&2
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echo "For help, type: $0 -h" >&2
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exit 1
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fi
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}
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compress_file()
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{
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file="$1"
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if ! ${f_force} && has_7z_suffix "${file}"; then
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echo "$0: $file already has the 7z suffix" >&2
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exit 1
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fi
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# compress to stdout via temporary file
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if ${f_tostdout}; then
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check_not_a_tty
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tmp="`make_tmp_file`"
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trap "rm -f -- ${tmp}" 0
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rm -f -- "${tmp}"
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"${prg7z}" a -si -- "${tmp}" < "${file}" >/dev/null && cat "${tmp}" || \
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{ echo "$0: failed to compress data to temporary file" >&2; exit 1; }
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rm -f -- "${tmp}"
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return 0
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fi
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# compress to a file
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if ! ${f_force} && [ -e "${file}.7z" ]; then
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echo "$0: destination file ${file}.7z already exists" >&2
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exit 1
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fi
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rm -f -- "${file}.7z"
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flags=""
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${f_keep} || flags="$flags -sdel"
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! ${f_force} || flags="$flags -y"
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"${prg7z}" a $flags -- "${file}.7z" "${file}" || { rm -f -- "${file}.7z"; exit 1; }
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}
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decompress_file()
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{
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file="$1"
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has_7z_suffix "${file}" || { echo "$0: ${file}: unknown suffix" >&2; exit 1; }
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# decompress to stdout
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if ${f_tostdout}; then
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# The following `| cat' pipe shouldn't be needed, however it is here to
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# trick 7z not to complain about writing data to terminal.
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"${prg7z}" x -so -- "${file}" | cat || exit 1
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return 0;
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fi
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flags=""
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! ${f_force} || flags="$flags -y"
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"${prg7z}" x $flags -- "${file}" || exit 1
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# remove original file unless the archive contains more than one file
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if ! ${f_keep} && "${prg7z}" l -- "${file}" 2>/dev/null | grep -q '^1 file,' 2>/dev/null; then
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rm -f -- "${file}"
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fi
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}
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process_file()
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{
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file="$1"
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# check if file exists and is readable
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[ -r "${file}" ] || { echo "$0: cannot read ${file}" >&2; exit 1; }
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if ${f_compress}; then
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compress_file "${file}"
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else
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decompress_file "${file}"
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fi
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}
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process_stdin()
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{
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check_not_a_tty
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tmp="`make_tmp_file`"
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trap "rm -f -- ${tmp}" 0
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if ${f_compress}; then
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rm -f -- "${tmp}"
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"${prg7z}" a -si -- "${tmp}" >/dev/null && cat -- "${tmp}" || exit 1
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else # decompress
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cat > "${tmp}"
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# The following `| cat' pipe shouldn't be needed, however it is here to
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# trick 7z not to complain about writing data to terminal.
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"${prg7z}" x -so -- "${tmp}" | cat || exit 1
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fi
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rm -f -- "${tmp}"
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}
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## MAIN
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# files and flags
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while [ "$#" != "0" ] ; do
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case "$1" in
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-c|--stdout|--to-stdout)
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f_tostdout=true
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;;
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-d|--decompress|--uncompress)
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f_compress=false # decompressing
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;;
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-f|--force)
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f_force=true
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;;
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-h|--help)
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usage
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;;
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-k|--keep)
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f_keep=true
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;;
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--)
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shift
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break
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;;
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-*)
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echo "$0: ignoring unknown option $1" >&2
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;;
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*)
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break
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;;
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esac
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shift
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done
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# make sure they're present, before we screw up
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for i in mktemp rm cat tty grep; do
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if ! which $i >/dev/null ; then
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echo "$0: $i: command not found" >&2
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exit 1
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fi
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done
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if [ "$#" = 0 ]; then
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# compressing/decompressing using standard I/O
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process_stdin
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exit 0
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fi
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# only files now
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while [ "$#" != "0" ] ; do
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process_file "$1"
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shift
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done
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exit 0
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