summaryrefslogtreecommitdiff
path: root/scripts/pkgdelta.sh.in
blob: 9f87185bbb672ba2328d4381844e3b15495c2b02 (plain)
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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
#!/bin/bash
#
#   pkgdelta - create delta files for use with pacman and repo-add
#   @configure_input@
#
#   Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>
#
#   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, see <http://www.gnu.org/licenses/>.
#

# bash options
set -o errexit

# gettext initialization
export TEXTDOMAIN='pacman-scripts'
export TEXTDOMAINDIR='@localedir@'

declare -r myver='@PACKAGE_VERSION@'

LIBRARY=${LIBRARY:-'@libmakepkgdir@'}

# Import parseopts.sh
source "$LIBRARY"/util/parseopts.sh

# Options
QUIET=0
USE_COLOR='y'

# minimal of package before deltas are generated (bytes)
min_pkg_size=$((1024*1024))

# percent of new package above which the delta will be discarded
max_delta_size=70


# ensure we have a sane umask set
umask 0022

m4_include(library/output_format.sh)

# print usage instructions
usage() {
	printf "pkgdelta (pacman) %s\n" "${myver}"
	echo
	printf -- "$(gettext "Usage: pkgdelta [options] <package1> <package2>\n")"
	echo
	printf -- "$(gettext "\
pkgdelta will create a delta file between two packages.\n\
This delta file can then be added to a database using repo-add.\n")"
	echo
	printf -- "$(gettext "Example:  pkgdelta pacman-3.0.0.pkg.tar.gz pacman-3.0.1.pkg.tar.gz")\n"
	echo
	printf -- "$(gettext "Options:\n")"
	printf -- "$(gettext "  -q, --quiet       minimize output\n")"
	printf -- "$(gettext "  --nocolor         remove color from output\n")"
	printf -- "$(gettext "  --min-pkg-size    minimum package size before deltas are generated\n")"
	printf -- "$(gettext "  --max-delta-size  percent of new package above which the delta will be discarded\n")"
}

version() {
	printf "pkgdelta (pacman) %s\n" "$myver"
	printf -- "$(gettext "\
Copyright (c) 2009 Xavier Chantry <shiningxc@gmail.com>.\n\n\
This is free software; see the source for copying conditions.\n\
There is NO WARRANTY, to the extent permitted by law.\n")"
}

m4_include(library/human_to_size.sh)

isnumeric() {
	[[ $1 != *[!0-9]* ]]
}

read_pkginfo() {
	unset pkgver pkgname arch
	while IFS='=' read -r field value; do
		# skip comments and invalid lines
		[[ $field = '#'* || -z $value ]] && continue

		# skip lines which aren't fields we care about
		[[ $field != @(pkgver|pkgname|arch) ]] || continue

		declare -g "${field% }=${value# }"

		[[ $pkgname && $pkgver && $arch ]] && return 0
	done < <(bsdtar -xOqf "$1" .PKGINFO 2>/dev/null)

	error "$(gettext "Invalid package file '%s'.")" "$1"
	return 1
}

# $oldfile $oldmd5 $newfile $newmd5 $deltafile $deltamd5 $deltasize
create_xdelta()
{
	local oldfile=$1
	local newfile=$2
	local \
	oldname oldver oldarch \
	newname newver newarch \
	deltafile

	read_pkginfo "$oldfile" || return 1
	oldname="$pkgname"
	oldver="$pkgver"
	oldarch="$arch"
	read_pkginfo "$newfile" || return 1
	newname="$pkgname"
	newver="$pkgver"
	newarch="$arch"

	pkgsize="$(@SIZECMD@ -L "$newfile")"

	if ((pkgsize < min_pkg_size)); then
		msg "$(gettext "Skipping delta creation for small package: %s - size %s")" "$newname" "$pkgsize"
		return 0
	fi

	if [[ $oldname != "$newname" ]]; then
		error "$(gettext "The package names don't match : '%s' and '%s'")" "$oldname" "$newname"
		return 1
	fi

	if [[ $oldarch != "$newarch" ]]; then
		error "$(gettext "The package architectures don't match : '%s' and '%s'")" "$oldarch" "$newarch"
		return 1
	fi

	if [[ $oldver == "$newver" ]]; then
		error "$(gettext "Both packages have the same version : '%s'")" "$newver"
		return 1
	fi

	msg "$(gettext "Generating delta from version %s to version %s")" "$oldver" "$newver"
	deltafile=$(dirname "$newfile")/$pkgname-${oldver}_to_${newver}-$arch.delta
	local ret=0

	xdelta3 -q -f -9 -S lzma -s "$oldfile" "$newfile" "$deltafile" || ret=$?
	if (( ret )); then
		error "$(gettext "Delta could not be created.")"
		return 1
	fi

	deltasize="$(@SIZECMD@ -L "$deltafile")"

	if ((max_delta_size * pkgsize / 100 < deltasize)); then
		msg "$(gettext "Delta package larger than maximum size. Removing.")"
		rm -f "$deltafile"
		return 0
	fi

	msg "$(gettext "Generated delta : '%s'")" "$deltafile"
	(( QUIET )) && echo "$deltafile"

	return 0
}

OPT_SHORT='hqV'
OPT_LONG=('help' 'quiet' 'max-delta-size:' 'min-pkg-size:' 'nocolor' 'version')
if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
	exit 1
fi
set -- "${OPTRET[@]}"
unset OPT_SHORT OPT_LONG OPTRET

# parse arguments
while :; do
	case $1 in
		-h|--help)
			usage
			exit 0 ;;
		-V|--version)
			version
			exit 0 ;;
		-q|--quiet)
			QUIET=1;;
		--nocolor)
			USE_COLOR='n';;
		--min-pkg-size)
			if ! min_pkg_size=$(human_to_size "$2"); then
				echo "invalid argument '$2' for option -- '$1'"
				exit 1
			fi
			shift ;;
		--max-delta-size)
			arg=$(awk -v val="$2" 'BEGIN { print val * 100 }')
			if ! isnumeric "$arg" || (( arg > 200 )); then
				echo "invalid argument '$2' for option -- '$1'"
				exit 1
			fi
			max_delta_size=$arg
			shift ;;
		--)
			shift
			break 2 ;;
	esac
	shift
done

m4_include(library/term_colors.sh)

if (( $# != 2 )); then
	usage
	exit 1
fi

for i in "$@"; do
	if [[ ! -f $i ]]; then
		error "$(gettext "File '%s' does not exist")" "$i"
		exit 1
	fi
done

if ! type xdelta3 &>/dev/null; then
	error "$(gettext "Cannot find the xdelta3 binary! Is xdelta3 installed?")"
	exit 1
fi

create_xdelta "$@"

# vim: set noet: