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![Xin LI](/assets/img/avatar_default.png)
NetBSD version is a feature-to-feature re-implementation of GNU gzip using the freely-redistributable zlib and this version is expected to be mostly bug-to-bug compatible with the GNU implementation. - Because this is a piece of mature code and we want to make changes so it is added directly rather than importing to src/contrib. - Connect newly added code to src/usr.bin/ and rescue/rescue build. - Disconnect the GNU gzip code from build for now, they will be eventually removed completely. - Provide two new src.conf(5) knobs, WITHOUT_BZIP2_SUPPORT and WITHOUT_BZIP2. Tested by: kris (full exp-7 pointyhat build) Approved by: core (importing a 4-clause BSD licensed file) Approved by: re (adding new utility during -HEAD code slush)
180 lines
3.9 KiB
Bash
180 lines
3.9 KiB
Bash
#!/bin/sh -
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#
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# $NetBSD: gzexe,v 1.3 2004/05/01 08:22:41 wiz Exp $
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# $OpenBSD: gzexe,v 1.3 2003/08/05 18:22:17 deraadt Exp $
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#
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#-
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# Copyright (c) 2003 Otto Moerbeek <otto@drijf.net>
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#
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#
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# $FreeBSD$
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# The number of lines plus one in the on-the-fly decompression script
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lines=19
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# A simple string to recognize already compressed files
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magic="# compressed by gzexe"
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# Write the decompression script to stdout
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header () {
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# first section needs variable expansion, second not
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cat <<- EOF
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#!/bin/sh -
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$magic
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lines=$lines
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EOF
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cat <<- 'EOF'
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prog=`/usr/bin/basename "$0"`
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tmp=`/usr/bin/mktemp -d /tmp/gzexeXXXXXXXXXX` || {
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/bin/echo "$prog: cannot create tmp dir"; exit 1
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}
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trap '/bin/rm -rf "$tmp"' 0
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if /usr/bin/tail +$lines "$0" |
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/usr/bin/gzip -dc > "$tmp/$prog" 2> /dev/null; then
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/bin/chmod u+x "$tmp/$prog"
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"$tmp/$prog" ${1+"$@"}
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ret=$?
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else
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/bin/echo "$prog: cannot decompress $0"
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ret=1
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fi
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exit $ret
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EOF
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}
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# Test if a file is compressed by checking the magic line
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compressed () {
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test "X`sed -n 2p "$1" 2> /dev/null`" = "X$magic"
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}
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# Decompress a file
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decompress () {
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tmp=`mktemp /tmp/gzexeXXXXXXXXXX` || {
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echo "$prog: cannot create tmp file"
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return 1
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}
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if ! cp "$1" "$tmp"; then
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echo "$prog: cannot copy $1 to $tmp"
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rm -f "$tmp"
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return 1
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fi
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if ! tail +$lines "$tmp" | gzip -vdc > "$1"; then
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echo "$prog: cannot decompress $1"
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cp "$tmp" "$1"
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rm -f "$tmp"
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return 1
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fi
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}
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# Perform some sanity checks on the file
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check () {
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if test ! -e "$1"; then
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echo "$prog: cannot compress non-existing file $1"
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return 1
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fi
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if test ! -f "$1"; then
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echo "$prog: cannot compress non-regular file $1"
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return 1
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fi
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case `basename "$1"` in
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sh | mktemp | rm | echo | tail | gzip | chmod)
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echo "$prog: cannot compress $1, I depend on it"
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return 1
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esac
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if test ! -x "$1"; then
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echo "$prog: cannot compress $1, it is not executable"
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return 1
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fi
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if test -u "$1" -o -g "$1"; then
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echo "$prog: cannot compress $1, it has an s bit set"
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return 1
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fi
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}
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# Compress a file
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compress () {
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tmp=`mktemp /tmp/gzexeXXXXXXXXXX` || {
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echo "$prog: cannot create tmp file"
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return 1
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}
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if ! cp "$1" "$tmp"; then
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echo "$prog: cannot copy $1 to $tmp"
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rm -f "$tmp"
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return 1
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fi
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if ! cp "$1" "$1"~; then
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echo "$prog: cannot create backup copy $1~"
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rm -f "$1"~ "$tmp"
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return 1
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fi
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# Use cp to overwrite the existing file preserving mode and owner
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# if possible. If the file is not writable, this will produce an
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# error.
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if header "$1" > "$tmp" && gzip -vc "$1" >> "$tmp"; then
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if ! cp "$tmp" "$1"; then
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echo "$prog: cannot copy $tmp to $1"
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rm -f "$tmp"
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return 1
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fi
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else
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echo "$prog: cannot compress $1"
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rm -f "$1"~ "$tmp"
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return 1
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fi
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}
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# Is the -d flag specified?
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dflag=
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# Return value
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rc=0
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if test "X$1" = X-d; then
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dflag=1
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shift
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fi
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prog=`basename "$0"`
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USAGE="usage: $prog [-d] file ..."
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if test $# -eq 0; then
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echo $USAGE
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exit 1
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fi
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while test $# -ne 0; do
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if test $dflag; then
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if ! compressed "$1"; then
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echo "$prog: $1 is not compressed"
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rc=1;
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elif ! decompress "$1"; then
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rc=$?
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fi
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else
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if compressed "$1"; then
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echo "$prog: $1 is already compressed"
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rc=1;
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elif ! check "$1" || ! compress "$1"; then
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rc=$?
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fi
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fi
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shift
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done
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exit $rc
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