diff options
Diffstat (limited to 'file_cmds/gzip/gzexe')
| -rw-r--r-- | file_cmds/gzip/gzexe | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/file_cmds/gzip/gzexe b/file_cmds/gzip/gzexe new file mode 100644 index 0000000..5809133 --- /dev/null +++ b/file_cmds/gzip/gzexe @@ -0,0 +1,179 @@ +#!/bin/sh - +# +# $NetBSD: gzexe,v 1.3 2004/05/01 08:22:41 wiz Exp $ +# $OpenBSD: gzexe,v 1.3 2003/08/05 18:22:17 deraadt Exp $ +# +#- +# Copyright (c) 2003 Otto Moerbeek <otto@drijf.net> +# +# Permission to use, copy, modify, and distribute this software for any +# purpose with or without fee is hereby granted, provided that the above +# copyright notice and this permission notice appear in all copies. +# +# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +# +# $FreeBSD: src/usr.bin/gzip/gzexe,v 1.1 2007/01/26 10:19:07 delphij Exp $ + +# The number of lines plus one in the on-the-fly decompression script +lines=19 + +# A simple string to recognize already compressed files +magic="# compressed by gzexe" + +# Write the decompression script to stdout +header () { + # first section needs variable expansion, second not + cat <<- EOF + #!/bin/sh - + $magic + lines=$lines + EOF + cat <<- 'EOF' + prog=`/usr/bin/basename "$0"` + tmp=`/usr/bin/mktemp -d /tmp/gzexeXXXXXXXXXX` || { + /bin/echo "$prog: cannot create tmp dir"; exit 1 + } + trap '/bin/rm -rf "$tmp"' 0 + if /usr/bin/tail +$lines "$0" | + /usr/bin/gzip -dc > "$tmp/$prog" 2> /dev/null; then + /bin/chmod u+x "$tmp/$prog" + "$tmp/$prog" ${1+"$@"} + ret=$? + else + /bin/echo "$prog: cannot decompress $0" + ret=1 + fi + exit $ret + EOF +} + +# Test if a file is compressed by checking the magic line +compressed () { + test "X`sed -n 2p "$1" 2> /dev/null`" = "X$magic" +} + +# Decompress a file +decompress () { + tmp=`mktemp /tmp/gzexeXXXXXXXXXX` || { + echo "$prog: cannot create tmp file" + return 1 + } + if ! cp "$1" "$tmp"; then + echo "$prog: cannot copy $1 to $tmp" + rm -f "$tmp" + return 1 + fi + if ! tail +$lines "$tmp" | gzip -vdc > "$1"; then + echo "$prog: cannot decompress $1" + cp "$tmp" "$1" + rm -f "$tmp" + return 1 + fi +} + +# Perform some sanity checks on the file +check () { + if test ! -e "$1"; then + echo "$prog: cannot compress non-existing file $1" + return 1 + fi + + if test ! -f "$1"; then + echo "$prog: cannot compress non-regular file $1" + return 1 + fi + + case `basename "$1"` in + sh | mktemp | rm | echo | tail | gzip | chmod) + echo "$prog: cannot compress $1, I depend on it" + return 1 + esac + + if test ! -x "$1"; then + echo "$prog: cannot compress $1, it is not executable" + return 1 + fi + + if test -u "$1" -o -g "$1"; then + echo "$prog: cannot compress $1, it has an s bit set" + return 1 + fi +} + +# Compress a file +compress () { + tmp=`mktemp /tmp/gzexeXXXXXXXXXX` || { + echo "$prog: cannot create tmp file" + return 1 + } + if ! cp "$1" "$tmp"; then + echo "$prog: cannot copy $1 to $tmp" + rm -f "$tmp" + return 1 + fi + if ! cp "$1" "$1"~; then + echo "$prog: cannot create backup copy $1~" + rm -f "$1"~ "$tmp" + return 1 + fi + + # Use cp to overwrite the existing file preserving mode and owner + # if possible. If the file is not writable, this will produce an + # error. + + if header "$1" > "$tmp" && gzip -vc "$1" >> "$tmp"; then + if ! cp "$tmp" "$1"; then + echo "$prog: cannot copy $tmp to $1" + rm -f "$tmp" + return 1 + fi + else + echo "$prog: cannot compress $1" + rm -f "$1"~ "$tmp" + return 1 + fi +} + +# Is the -d flag specified? +dflag= + +# Return value +rc=0 + +if test "X$1" = X-d; then + dflag=1 + shift +fi + +prog=`basename "$0"` +USAGE="usage: $prog [-d] file ..." +if test $# -eq 0; then + echo $USAGE + exit 1 +fi + +while test $# -ne 0; do + if test $dflag; then + if ! compressed "$1"; then + echo "$prog: $1 is not compressed" + rc=1; + elif ! decompress "$1"; then + rc=$? + fi + else + if compressed "$1"; then + echo "$prog: $1 is already compressed" + rc=1; + elif ! check "$1" || ! compress "$1"; then + rc=$? + fi + fi + shift +done +exit $rc |