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
|
#! @BASH@
set -e
# File: backup-files.sh
# Copyright (C) 2006 Steve Langasek <vorlon@debian.org>
# portions Copyright (C) 2003, 2004, 2005, 2006 Andreas Gruenbacher
# <agruen@suse.de>, SuSE Labs
# 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; version 2 dated June, 1991.
# 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.
# Create backup files of a list of files similar to GNU patch. A path
# name prefix for the backup files must be specified with the -B option.
usage () {
echo "Usage: $0 [-B prefix] [-f {file|-}] [-s] [-k] [-t] [-L] [-b|-r|-x] {file|-} ...
Create hard linked backup copies of a list of files
read from standard input.
-b Create backup
-r Restore the backup
-x Remove backup files and empty parent directories
-k When doing a restore, keep the backup files
-B Path name prefix for backup files
-s Silent operation; only print error messages
-f Read the filenames to process from file (- = standard input)
-t Touch original files after restore (update their mtimes)
-L Ensure that when finished, the source file has a link count of 1
"
}
ensure_nolinks() {
local filename="$1"
local link_count tmpname
link_count=$(stat @STAT_HARDLINK@ "$filename")
if [ $link_count -gt 1 ]; then
tmpname=$(mktemp "$filename.XXXXXX")
cp -p "$filename" "$tmpname"
mv "$tmpname" "$filename"
fi
}
backup() {
local file="$1"
local backup="${OPT_PREFIX}${file}"
local dir
dir=$(dirname "$backup")
[ -d "$dir" ] || mkdir -p "$dir"
if [ ! -e "$file" ]; then
$ECHO "New file $file"
: > "$backup"
else
$ECHO "Copying $file"
if [ -n "$OPT_NOLINKS" -a "$(stat @STAT_HARDLINK@ "$file")" = 1 ]; then
cp -p "$file" "$backup"
else
ln "$file" "$backup" 2> /dev/null || cp -p "$file" "$backup"
if [ -n "$OPT_NOLINKS" ]; then
ensure_nolinks "$file"
fi
fi
fi
}
restore()
{
local file="$1"
local backup="${OPT_PREFIX}${file}"
if [ ! -e "$backup" ]; then
return 1
fi
if [ ! -s "$backup" ]; then
$ECHO "Removing $file"
if [ -e "$file" ]; then
rm "$file"
fi
else
$ECHO "Restoring $file"
if [ -e "$file" ]; then
rm "$file"
else
mkdir -p "$(dirname "$file")"
fi
if [ -n "$OPT_NOLINKS" ]; then
cp -p "$backup" "$file"
else
ln "$backup" "$file" 2> /dev/null || cp -p "$backup" "$file"
fi
if [ -n "$OPT_TOUCH" ]; then
touch "$file"
fi
fi
if [ -z "$OPT_KEEP_BACKUP" ]; then
rm "$backup"
rmdir -p "${backup%/*}" 2> /dev/null || true
fi
}
remove()
{
local file="$1"
local backup="${OPT_PREFIX}${file}"
if [ -e "$backup" ]; then
rm "$backup"
fi
rmdir -p "${backup%/*}" 2> /dev/null || true
}
noop()
{
local file="$1"
if [ -e "$file" ] && [ -n "$OPT_NOLINKS" ]; then
ensure_nolinks "$file"
fi
}
ECHO=echo
OPT_WHAT=noop
while [ $# -gt 0 ]; do
case $1 in
-b) OPT_WHAT=backup
;;
-r) OPT_WHAT=restore
;;
-x) OPT_WHAT=remove
;;
-B) OPT_PREFIX=$2
shift
;;
-f) OPT_FILE=$2
shift
;;
-s) ECHO=:
;;
-k) OPT_KEEP_BACKUP=1
;;
-L) OPT_NOLINKS=1
;;
-t) OPT_TOUCH=1
;;
-?*) usage
exit 0
;;
*) break
;;
esac
shift
done
if [ -z "$OPT_PREFIX" ]; then
usage
exit 1
fi
if [ "${OPT_PREFIX:(-1)}" != / ]; then
echo "Prefix must be a directory" >&2
exit 1
fi
if [ -n "$OPT_FILE" ]; then
cat "$OPT_FILE" \
| while read nextfile; do
$OPT_WHAT "$nextfile"
done
fi
while [ $# -gt 0 ]; do
case $1 in
-)
# No backup directory? We're done
[ -d "$OPT_PREFIX" ] || exit 0
find "$OPT_PREFIX" -type f -print \
| while read
do
$OPT_WHAT "${REPLY#$OPT_PREFIX}"
done
if [ ${PIPESTATUS[0]} != 0 ]; then
exit 1
fi
;;
*)
$OPT_WHAT "$1"
;;
esac
shift
done
|
