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1479465f GJ |
1 | /* |
2 | * dpkg - main program for package management | |
3 | * infodb-format.c - package control information database format | |
4 | * | |
5 | * Copyright © 2011-2014 Guillem Jover <guillem@debian.org> | |
6 | * | |
7 | * This is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <config.h> | |
22 | #include <compat.h> | |
23 | ||
24 | #include <sys/types.h> | |
25 | #include <sys/stat.h> | |
26 | ||
27 | #include <errno.h> | |
28 | #include <stdlib.h> | |
29 | #include <stdio.h> | |
30 | ||
31 | #include <dpkg/i18n.h> | |
32 | #include <dpkg/dpkg.h> | |
33 | #include <dpkg/dpkg-db.h> | |
34 | #include <dpkg/varbuf.h> | |
35 | ||
36 | #include "infodb.h" | |
37 | ||
38 | static enum pkg_infodb_format db_format = PKG_INFODB_FORMAT_UNKNOWN; | |
39 | static bool db_upgrading; | |
40 | ||
41 | static enum pkg_infodb_format | |
42 | pkg_infodb_parse_format(const char *file) | |
43 | { | |
44 | FILE *fp; | |
45 | int format; | |
46 | ||
47 | fp = fopen(file, "r"); | |
48 | if (fp == NULL) { | |
49 | /* A missing format file means legacy format (0). */ | |
50 | if (errno == ENOENT) | |
51 | return PKG_INFODB_FORMAT_LEGACY; | |
52 | ohshite(_("error trying to open %.250s"), file); | |
53 | } | |
54 | ||
55 | if (fscanf(fp, "%u", &format) != 1) | |
56 | ohshit(_("corrupt info database format file '%s'"), file); | |
57 | ||
58 | fclose(fp); | |
59 | ||
60 | return format; | |
61 | } | |
62 | ||
63 | static enum pkg_infodb_format | |
64 | pkg_infodb_read_format(void) | |
65 | { | |
66 | struct atomic_file *file; | |
67 | struct stat st; | |
68 | char *filename; | |
69 | ||
70 | filename = dpkg_db_get_path(INFODIR "/format"); | |
71 | file = atomic_file_new(filename, 0); | |
72 | ||
73 | db_format = pkg_infodb_parse_format(file->name); | |
74 | ||
75 | /* Check if a previous upgrade got interrupted. Because we are only | |
76 | * supposed to upgrade the db layout one format at a time, if the | |
77 | * new file exists that means the new format is just one ahead, | |
78 | * we don't try to read it because it contains unreliable data. */ | |
79 | if (stat(file->name_new, &st) == 0) { | |
80 | db_format++; | |
81 | db_upgrading = true; | |
82 | } | |
83 | ||
84 | atomic_file_free(file); | |
85 | free(filename); | |
86 | ||
87 | if (db_format < 0 || db_format >= PKG_INFODB_FORMAT_LAST) | |
88 | ohshit(_("info database format (%d) is bogus or too new; " | |
89 | "try getting a newer dpkg"), db_format); | |
90 | ||
91 | return db_format; | |
92 | } | |
93 | ||
94 | enum pkg_infodb_format | |
95 | pkg_infodb_get_format(void) | |
96 | { | |
97 | if (db_format > PKG_INFODB_FORMAT_UNKNOWN) | |
98 | return db_format; | |
99 | else | |
100 | return pkg_infodb_read_format(); | |
101 | } | |
102 | ||
103 | void | |
104 | pkg_infodb_set_format(enum pkg_infodb_format version) | |
105 | { | |
106 | db_format = version; | |
107 | } | |
108 | ||
109 | bool | |
110 | pkg_infodb_is_upgrading(void) | |
111 | { | |
112 | if (db_format < 0) | |
113 | pkg_infodb_read_format(); | |
114 | ||
115 | return db_upgrading; | |
116 | } | |
117 | ||
118 | const char * | |
119 | pkg_infodb_get_dir(void) | |
120 | { | |
121 | static char *infodir; | |
122 | ||
123 | if (infodir == NULL) | |
124 | infodir = dpkg_db_get_path(INFODIR); | |
125 | ||
126 | return infodir; | |
127 | } | |
128 | ||
129 | const char * | |
130 | pkg_infodb_get_file(struct pkginfo *pkg, struct pkgbin *pkgbin, | |
131 | const char *filetype) | |
132 | { | |
133 | static struct varbuf vb; | |
134 | enum pkg_infodb_format format; | |
135 | ||
136 | /* Make sure to always read and verify the format version. */ | |
137 | format = pkg_infodb_get_format(); | |
138 | ||
139 | varbuf_reset(&vb); | |
140 | varbuf_add_str(&vb, pkg_infodb_get_dir()); | |
141 | varbuf_add_char(&vb, '/'); | |
142 | varbuf_add_str(&vb, pkg->set->name); | |
143 | if (pkgbin->multiarch == PKG_MULTIARCH_SAME && | |
144 | format == PKG_INFODB_FORMAT_MULTIARCH) | |
145 | varbuf_add_archqual(&vb, pkgbin->arch); | |
146 | varbuf_add_char(&vb, '.'); | |
147 | varbuf_add_str(&vb, filetype); | |
148 | varbuf_end_str(&vb); | |
149 | ||
150 | return vb.buf; | |
151 | } |