/usr/bin/dscextract is in devscripts 2.16.2ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | #!/bin/sh
# dscextract.sh - Extract a single file from a Debian source package
# Copyright (C) 2011 Christoph Berg <myon@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
set -eu
die () {
echo "$*" >&2
exit 2
}
setzip () {
case $1 in
*.gz) ZIP=--gzip ;;
*.xz) ZIP=--xz ;;
*.lzma) ZIP=--lzma ;;
*.bz2) ZIP=--bzip2 ;;
esac
}
FAST=""
while getopts "f" opt ; do
case $opt in
f) FAST=yes ;;
*) exit 2 ;;
esac
done
# shift away args
shift $(($OPTIND - 1))
[ $# = 2 ] || die "Usage: $(basename $0) <dsc> <file>"
DSC="$1"
test -e "$DSC" || die "$DSC not found"
FILE="$2"
DSCDIR=$(dirname "$DSC")
WORKDIR=$(mktemp -d --tmpdir dscextract.XXXXXX)
trap "rm -rf $WORKDIR" 0 2 3 15
if DIFFGZ=$(egrep '^ [0-9a-f]{32,64} [0-9]+ [^ ]+\.diff\.(gz|xz|lzma|bz2)$' "$DSC") ; then
DIFFGZ=$(echo "$DIFFGZ" | cut -d ' ' -f 4 | head -n 1)
test -e "$DSCDIR/$DIFFGZ" || die "$DSCDIR/$DIFFGZ: not found"
filterdiff -p1 -i "$FILE" -z "$DSCDIR/$DIFFGZ" > "$WORKDIR/patch"
if test -s "$WORKDIR/patch" ; then
# case 1: file found in .diff.gz
if ! grep -q '^@@ -0,0 ' "$WORKDIR/patch" ; then
# case 1a: patch requires original file
ORIGTGZ=$(egrep '^ [0-9a-f]{32,64} [0-9]+ [^ ]+\.orig\.tar\.(gz|xz|lzma|bz2)$' "$DSC") || die "no orig.tar.* found in $DSC"
ORIGTGZ=$(echo "$ORIGTGZ" | cut -d ' ' -f 4 | head -n 1)
setzip $ORIGTGZ
test -e "$DSCDIR/$ORIGTGZ" || die "$DSCDIR/$ORIGTGZ not found"
tar --extract --to-stdout $ZIP --file "$DSCDIR/$ORIGTGZ" --wildcards "*/$FILE" > "$WORKDIR/output" 2>/dev/null || :
test -s "$WORKDIR/output" || die "$FILE not found in $DSCDIR/$ORIGTGZ, but required by patch"
fi
patch --silent "$WORKDIR/output" < "$WORKDIR/patch"
test -s "$WORKDIR/output" || die "patch $FILE did not produce any output"
cat "$WORKDIR/output"
exit 0
elif [ "$FAST" ] ; then
# in fast mode, don't bother looking into .orig.tar.gz
exit 1
fi
fi
if DEBIANTARGZ=$(egrep '^ [0-9a-f]{32,64} [0-9]+ [^ ]+\.debian\.tar\.(gz|xz|lzma|bz2)$' "$DSC") ; then
case $FILE in
debian/*)
DEBIANTARGZ=$(echo "$DEBIANTARGZ" | cut -d ' ' -f 4 | head -n 1)
test -e "$DSCDIR/$DEBIANTARGZ" || die "$DSCDIR/$DEBIANTARGZ not found"
setzip $DEBIANTARGZ
tar --extract --to-stdout $ZIP --file "$DSCDIR/$DEBIANTARGZ" "$FILE" > "$WORKDIR/output" 2>/dev/null || :
test -s "$WORKDIR/output" || exit 1
# case 2a: file found in .debian.tar.gz
cat "$WORKDIR/output"
exit 0
# for 3.0 format, no need to look in other places here
;;
*)
ORIGTGZ=$(egrep '^ [0-9a-f]{32,64} [0-9]+ [^ ]+\.orig\.tar\.(gz|xz|lzma|bz2)$' "$DSC") || die "no orig.tar.gz found in $DSC"
ORIGTGZ=$(echo "$ORIGTGZ" | cut -d ' ' -f 4 | head -n 1)
test -e "$DSCDIR/$ORIGTGZ" || die "$DSCDIR/$ORIGTGZ not found"
setzip $ORIGTGZ
tar --extract --to-stdout $ZIP --file "$DSCDIR/$ORIGTGZ" --wildcards --no-wildcards-match-slash "*/$FILE" > "$WORKDIR/output" 2>/dev/null || :
test -s "$WORKDIR/output" || exit 1
# case 2b: file found in .orig.tar.gz
# TODO: apply patches from debian.tar.gz
cat "$WORKDIR/output"
exit 0
;;
esac
fi
if TARGZ=$(egrep '^ [0-9a-f]{32,64} [0-9]+ [^ ]+\.tar\.(gz|xz|lzma|bz2)$' "$DSC") ; then
TARGZ=$(echo "$TARGZ" | cut -d ' ' -f 4 | head -n 1)
test -e "$DSCDIR/$TARGZ" || die "$DSCDIR/$TARGZ not found"
setzip $TARGZ
tar --extract --to-stdout $ZIP --file "$DSCDIR/$TARGZ" --wildcards --no-wildcards-match-slash "*/$FILE" > "$WORKDIR/output" 2>/dev/null || :
test -s "$WORKDIR/output" || exit 1
# case 3: file found in .tar.gz or .orig.tar.gz
cat "$WORKDIR/output"
exit 0
fi
exit 1
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