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1479465f GJ |
1 | /* |
2 | * dpkg - main program for package management | |
3 | * filesdb-hash.c - management of database of files installed on system | |
4 | * | |
5 | * Copyright © 2012-2014 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/stat.h> | |
25 | ||
26 | #include <errno.h> | |
27 | #include <string.h> | |
28 | #include <stdio.h> | |
29 | #include <fcntl.h> | |
30 | #include <unistd.h> | |
31 | ||
32 | #include <dpkg/i18n.h> | |
33 | #include <dpkg/dpkg.h> | |
34 | #include <dpkg/dpkg-db.h> | |
35 | #include <dpkg/debug.h> | |
36 | #include <dpkg/fdio.h> | |
37 | #include <dpkg/dir.h> | |
38 | ||
39 | #include "filesdb.h" | |
40 | #include "infodb.h" | |
41 | ||
42 | /* | |
43 | * If mask is nonzero, will not write any file whose filenamenode | |
44 | * has any flag bits set in mask. | |
45 | */ | |
46 | void | |
47 | write_filehash_except(struct pkginfo *pkg, struct pkgbin *pkgbin, | |
48 | struct fileinlist *list, enum filenamenode_flags mask) | |
49 | { | |
50 | struct atomic_file *file; | |
51 | const char *hashfile; | |
52 | ||
53 | debug(dbg_general, "generating infodb hashfile"); | |
54 | ||
55 | if (pkg_infodb_has_file(pkg, &pkg->available, HASHFILE)) | |
56 | return; | |
57 | ||
58 | hashfile = pkg_infodb_get_file(pkg, pkgbin, HASHFILE); | |
59 | ||
60 | file = atomic_file_new(hashfile, 0); | |
61 | atomic_file_open(file); | |
62 | ||
63 | for (; list; list = list->next) { | |
64 | struct filenamenode *namenode = list->namenode; | |
65 | ||
66 | if (mask && (namenode->flags & mask)) | |
67 | continue; | |
68 | if (strcmp(namenode->newhash, EMPTYHASHFLAG) == 0) | |
69 | continue; | |
70 | ||
71 | fprintf(file->fp, "%s %s\n", | |
72 | namenode->newhash, namenode->name + 1); | |
73 | } | |
74 | ||
75 | atomic_file_sync(file); | |
76 | atomic_file_close(file); | |
77 | atomic_file_commit(file); | |
78 | atomic_file_free(file); | |
79 | ||
80 | dir_sync_path(pkg_infodb_get_dir()); | |
81 | } | |
82 | ||
83 | static void | |
84 | parse_filehash_buffer(char *buf, char *buf_end, | |
85 | struct pkginfo *pkg, struct pkgbin *pkgbin) | |
86 | { | |
87 | char *thisline, *nextline; | |
88 | const char *pkgname = pkg_name(pkg, pnaw_nonambig); | |
89 | ||
90 | for (thisline = buf; thisline < buf_end; thisline = nextline) { | |
91 | struct filenamenode *namenode; | |
92 | char *endline, *hash_end, *filename; | |
93 | ||
94 | endline = memchr(thisline, '\n', buf_end - thisline); | |
95 | if (endline == NULL) | |
96 | ohshit(_("control file '%s' for package '%s' is " | |
97 | "missing final newline"), HASHFILE, pkgname); | |
98 | ||
99 | /* The md5sum hash has a constant length. */ | |
100 | hash_end = thisline + MD5HASHLEN; | |
101 | ||
102 | filename = hash_end + 2; | |
103 | if (filename + 1 > endline) | |
104 | ohshit(_("control file '%s' for package '%s' is " | |
105 | "missing value"), HASHFILE, pkgname); | |
106 | ||
107 | if (hash_end[0] != ' ' || hash_end[1] != ' ') | |
108 | ohshit(_("control file '%s' for package '%s' is " | |
109 | "missing value separator"), HASHFILE, pkgname); | |
110 | hash_end[0] = '\0'; | |
111 | ||
112 | /* Where to start next time around. */ | |
113 | nextline = endline + 1; | |
114 | ||
115 | /* Strip trailing ‘/’. */ | |
116 | if (endline > thisline && endline[-1] == '/') | |
117 | endline--; | |
118 | *endline = '\0'; | |
119 | ||
120 | if (endline == thisline) | |
121 | ohshit(_("control file '%s' for package '%s' " | |
122 | "contains empty filename"), HASHFILE, pkgname); | |
123 | ||
124 | debug(dbg_eachfiledetail, "load hash '%s' for filename '%s'", | |
125 | thisline, filename); | |
126 | ||
127 | /* Add the file to the list. */ | |
128 | namenode = findnamenode(filename, fnn_nocopy); | |
129 | namenode->newhash = thisline; | |
130 | } | |
131 | } | |
132 | ||
133 | void | |
134 | parse_filehash(struct pkginfo *pkg, struct pkgbin *pkgbin) | |
135 | { | |
136 | static int fd; | |
137 | const char *hashfile; | |
138 | struct stat st; | |
139 | ||
140 | hashfile = pkg_infodb_get_file(pkg, pkgbin, HASHFILE); | |
141 | ||
142 | fd = open(hashfile, O_RDONLY); | |
143 | if (fd < 0) { | |
144 | if (errno == ENOENT) | |
145 | return; | |
146 | ||
147 | ohshite(_("cannot open control file '%s' for package '%s'"), | |
148 | HASHFILE, pkg_name(pkg, pnaw_nonambig)); | |
149 | } | |
150 | ||
151 | if (fstat(fd, &st) < 0) | |
152 | ohshite(_("cannot stat control file '%s' for package '%s'"), | |
153 | HASHFILE, pkg_name(pkg, pnaw_nonambig)); | |
154 | ||
155 | if (!S_ISREG(st.st_mode)) | |
156 | ohshit(_("control file '%s' for package '%s' is not a regular file"), | |
157 | HASHFILE, pkg_name(pkg, pnaw_nonambig)); | |
158 | ||
159 | if (st.st_size > 0) { | |
160 | char *buf, *buf_end; | |
161 | ||
162 | buf = nfmalloc(st.st_size); | |
163 | buf_end = buf + st.st_size; | |
164 | ||
165 | if (fd_read(fd, buf, st.st_size) < 0) | |
166 | ohshite(_("cannot read control file '%s' for package '%s'"), | |
167 | HASHFILE, pkg_name(pkg, pnaw_nonambig)); | |
168 | ||
169 | parse_filehash_buffer(buf, buf_end, pkg, pkgbin); | |
170 | } | |
171 | ||
172 | if (close(fd)) | |
173 | ohshite(_("cannot close control file '%s' for package '%s'"), | |
174 | HASHFILE, pkg_name(pkg, pnaw_nonambig)); | |
175 | } |