mirror of https://git.tukaani.org/xz.git
299 lines
10 KiB
Plaintext
299 lines
10 KiB
Plaintext
#!@POSIX_SHELL@
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# xzgrep -- a wrapper around a grep program that decompresses files as needed
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# Adapted from a version sent by Charles Levert <charles@comm.polymtl.ca>
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# Copyright (C) 1998, 2001, 2002, 2006, 2007 Free Software Foundation
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# Copyright (C) 1993 Jean-loup Gailly
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# Modified for XZ Utils by Andrew Dudman and Lasse Collin.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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@enable_path_for_scripts@
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#SET_PATH - This line is a placeholder to ease patching this script.
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# Instead of unsetting XZ_OPT, just make sure that xz will use file format
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# autodetection. This way memory usage limit and thread limit can be
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# specified via XZ_OPT. With gzip, bzip2, and lzop it's OK to just unset the
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# environment variables.
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xz='@xz@ --format=auto'
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unset GZIP BZIP BZIP2 LZOP
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case ${0##*/} in
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*egrep*) prog=xzegrep; grep=${GREP:-grep -E};;
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*fgrep*) prog=xzfgrep; grep=${GREP:-grep -F};;
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*) prog=xzgrep; grep=${GREP:-grep};;
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esac
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version="$prog (@PACKAGE_NAME@) @VERSION@"
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usage="Usage: ${0##*/} [OPTION]... [-e] PATTERN [FILE]...
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Look for instances of PATTERN in the input FILEs, using their
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uncompressed contents if they are compressed.
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OPTIONs are the same as for '$grep'.
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Report bugs to <@PACKAGE_BUGREPORT@>."
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# sed script to escape all ' for the shell, and then (to handle trailing
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# newlines correctly) turn trailing X on last line into '.
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escape='
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s/'\''/'\''\\'\'''\''/g
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$s/X$/'\''/
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'
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operands=
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have_pat=0
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files_with_matches=0
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files_without_matches=0
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no_filename=0
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with_filename=0
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# See if -H and --label options are supported (GNU and *BSDs).
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if test f:x = "$(eval "echo x | $grep -H --label=f x 2> /dev/null")"; then
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grep_supports_label=1
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else
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grep_supports_label=0
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fi
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while test $# -ne 0; do
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option=$1
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shift
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optarg=
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case $option in
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(-[0123456789abcdEFGhHiIKlLnoPqrRsTuUvVwxyzZ]*[!0123456789]*)
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# Something like -Fiv was specified, that is, $option contains more
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# than one option of which the first option (in this example -F)
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# doesn't take an argument. Split the first option into a standalone
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# argument and continue parsing the rest of the options (in this example,
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# replace -Fiv with -iv in the argument list and set option=-F).
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#
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# If there are digits [0-9] they are treated as if they were a single
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# option character because this syntax is an alias for -C for GNU grep.
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# For example, "grep -25F" is equivalent to "grep -C25 -F". If only
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# digits are specified like "grep -25" we don't get here because the
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# above pattern in the case-statement doesn't match such strings.
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arg2=-\'$(LC_ALL=C expr "X${option}X" : 'X-.[0-9]*\(.*\)' |
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LC_ALL=C sed "$escape")
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eval "set -- $arg2 "'${1+"$@"}'
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option=$(LC_ALL=C expr "X$option" : 'X\(-.[0-9]*\)');;
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(--binary-*=* | --[lm]a*=* | --reg*=*)
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# These options require an argument and an argument has been provided
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# with the --foo=argument syntax. All is good.
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;;
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(-[ABCDefmX] | --binary-* | --file | --[lm]a* | --reg*)
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# These options require an argument which should now be in $1.
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# If it isn't, display an error and exit.
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case ${1?"$option option requires an argument"} in
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(*\'*)
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optarg=" '"$(printf '%sX\n' "$1" | LC_ALL=C sed "$escape");;
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(*)
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optarg=" '$1'";;
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esac
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shift;;
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(--)
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break;;
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(-?*)
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;;
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(*)
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case $option in
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(*\'*)
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operands="$operands '"$(printf '%sX\n' "$option" |
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LC_ALL=C sed "$escape");;
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(*)
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operands="$operands '$option'";;
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esac
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${POSIXLY_CORRECT+break}
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continue;;
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esac
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case $option in
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(-[drRzZ] | --di* | --exc* | --inc* | --rec* | --nu*)
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printf >&2 '%s: %s: Option not supported\n' "$0" "$option"
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exit 2;;
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(-[ef]* | --file | --file=* | --reg*)
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have_pat=1;;
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(--h | --he | --hel | --help)
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printf '%s\n' "$usage" || exit 2
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exit;;
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(-H | --wi | --wit | --with | --with- | --with-f | --with-fi \
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| --with-fil | --with-file | --with-filen | --with-filena | --with-filenam \
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| --with-filename)
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with_filename=1
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continue;;
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(-l | --files-with-*)
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files_with_matches=1
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continue;;
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(-L | --files-witho*)
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files_without_matches=1
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continue;;
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(-h | --no-f*)
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no_filename=1;;
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(-V | --v | --ve | --ver | --vers | --versi | --versio | --version)
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printf '%s\n' "$version" || exit 2
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exit;;
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esac
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case $option in
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(*\'?*)
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option=\'$(printf '%sX\n' "$option" | LC_ALL=C sed "$escape");;
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(*)
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option="'$option'";;
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esac
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grep="$grep $option$optarg"
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done
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eval "set -- $operands "'${1+"$@"}'
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if test $have_pat -eq 0; then
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case ${1?"Missing pattern; try \`${0##*/} --help' for help"} in
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(*\'*)
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grep="$grep -e '"$(printf '%sX\n' "$1" | LC_ALL=C sed "$escape");;
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(*)
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grep="$grep -e '$1'";;
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esac
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shift
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fi
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if test $# -eq 0; then
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set -- -
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fi
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exec 3>&1
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# res=1 means that no file matched yet
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res=1
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for i; do
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case $i in
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*[-.][zZ] | *_z | *[-.]gz | *.t[ag]z) uncompress="gzip -cdf";;
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*[-.]bz2 | *[-.]tbz | *.tbz2) uncompress="bzip2 -cdf";;
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*[-.]lzo | *[-.]tzo) uncompress="lzop -cdf";;
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*[-.]zst | *[-.]tzst) uncompress="zstd -cdfq";; # zstd needs -q.
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*) uncompress="$xz -cdf";;
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esac
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# xz_status will hold the decompressor's exit status.
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# Exit status of grep (and in rare cases, printf or sed) is
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# available as the exit status of this assignment command.
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xz_status=$(
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exec 5>&1
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($uncompress -- "$i" 5>&-; echo $? >&5) 3>&- |
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if test $files_with_matches -eq 1; then
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eval "$grep -q" && { printf '%s\n' "$i" || exit 2; }
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elif test $files_without_matches -eq 1; then
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eval "$grep -q" || {
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r=$?
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if test $r -eq 1; then
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printf '%s\n' "$i" || r=2
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fi
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exit $r
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}
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elif test $with_filename -eq 0 &&
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{ test $# -eq 1 || test $no_filename -eq 1; }; then
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eval "$grep"
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elif test $grep_supports_label -eq 1; then
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# The grep implementation in use allows us to specify the filename
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# that grep will prefix to the output lines. This is faster and
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# less prone to security bugs than the fallback method that uses sed.
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# This also avoids confusing output with GNU grep >= 3.5 (2020-09-27)
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# which prints "binary file matches" to stderr instead of stdout.
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#
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# If reading from stdin, let grep use whatever name it prefers for
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# stdin. With GNU grep it is a locale-specific translated string.
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if test "x$i" = "x-"; then
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eval "$grep -H"
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else
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eval "$grep -H --label \"\$i\""
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fi
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else
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# Append a colon so that the last character will never be a newline
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# which would otherwise get lost in shell command substitution.
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i="$i:"
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# Escape & \ | and newlines only if such characters are present
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# (speed optimization).
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case $i in
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(*'
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'* | *'&'* | *'\'* | *'|'*)
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# If sed fails, set i to a known safe string to ensure that
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# failing sed did not create a half-escaped dangerous string.
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i=$(printf '%s\n' "$i" | LC_ALL=C sed 's/[&\|]/\\&/g; $!s/$/\\/') ||
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i='(unknown filename):';;
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esac
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# $i already ends with a colon so do not add it here.
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sed_script="s|^|$i|"
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# If grep or sed fails, pick the larger value of the two exit statuses.
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# If sed fails, use at least 2 since we use >= 2 to indicate errors.
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r=$(
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exec 4>&1
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(eval "$grep" 4>&-; echo $? >&4) 3>&- |
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LC_ALL=C sed "$sed_script" >&3 4>&-
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) || {
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sed_status=$?
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test "$sed_status" -lt 2 && sed_status=2
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test "$r" -lt "$sed_status" && r=$sed_status
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}
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exit $r
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fi >&3 5>&-
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)
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r=$?
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# If grep or sed or other non-decompression command failed with a signal,
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# exit immediately and ignore the possible remaining files.
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#
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# NOTE: Instead of 128 + signal_number, some shells use
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# 256 + signal_number (ksh) or 384 + signal_number (yash).
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# This is fine for us since their "exit" and "kill -l" commands take
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# this into account. (At least the versions I tried do but there is
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# a report of an old ksh variant whose "exit" truncates the exit status
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# to 8 bits without any special handling for values indicating a signal.)
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test "$r" -ge 128 && exit "$r"
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if test -z "$xz_status"; then
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# Something unusual happened, for example, we got a signal and
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# the exit status of the decompressor was never echoed and thus
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# $xz_status is empty. Exit immediately and ignore the possible
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# remaining files.
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exit 2
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elif test "$xz_status" -ge 128; then
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# The decompressor died due to a signal. SIGPIPE is ignored since it can
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# occur if grep exits before the whole file has been decompressed (grep -q
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# can do that). If the decompressor died with some other signal, exit
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# immediately and ignore the possible remaining files.
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test "$(kill -l "$xz_status" 2> /dev/null)" != "PIPE" && exit "$xz_status"
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elif test "$xz_status" -gt 0; then
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# Decompression failed but we will continue with the remaining
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# files anwyway. Set exit status to at least 2 to indicate an error.
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test "$r" -lt 2 && r=2
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fi
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# Since res=1 is the initial value, we only need to care about
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# matches (r == 0) and errors (r >= 2) here; r == 1 can be ignored.
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if test "$r" -ge 2; then
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# An error occurred in decompressor, grep, or some other command. Update
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# res unless a larger error code has been seen with an earlier file.
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test "$res" -lt "$r" && res=$r
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elif test "$r" -eq 0; then
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# grep found a match and no errors occurred. Update res if no errors have
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# occurred with earlier files.
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test "$res" -eq 1 && res=0
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fi
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done
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# 0: At least one file matched and no errors occurred.
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# 1: No matches were found and no errors occurred.
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# >=2: Error. It's unknown if matches were found.
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exit "$res"
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