build: Move common headers to noinst_HEADERS
[users/hertzog/dpkg.git] / src / infodb-access.c
1 /*
2  * dpkg - main program for package management
3  * infodb.c - package control information database
4  *
5  * Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
6  * Copyright © 2011 Guillem Jover <guillem@debian.org>
7  *
8  * This is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 #include <config.h>
23 #include <compat.h>
24
25 #include <sys/types.h>
26 #include <sys/stat.h>
27
28 #include <errno.h>
29 #include <dirent.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
37 #include "filesdb.h"
38 #include "infodb.h"
39
40 bool
41 pkg_infodb_has_file(struct pkginfo *pkg, struct pkgbin *pkgbin,
42                     const char *name)
43 {
44         const char *filename;
45         struct stat stab;
46
47         filename = pkgadminfile(pkg, pkgbin, name);
48         if (lstat(filename, &stab) == 0)
49                 return true;
50         else if (errno == ENOENT)
51                 return false;
52         else
53                 ohshite(_("unable to check existence of `%.250s'"), filename);
54 }
55
56 void
57 pkg_infodb_foreach(struct pkginfo *pkg, struct pkgbin *pkgbin,
58                    pkg_infodb_file_func *func)
59 {
60         DIR *db_dir;
61         struct dirent *db_de;
62         struct varbuf db_path = VARBUF_INIT;
63         size_t db_path_len;
64
65         varbuf_add_str(&db_path, pkgadmindir());
66         varbuf_add_char(&db_path, '/');
67         db_path_len = db_path.used;
68         varbuf_add_char(&db_path, '\0');
69
70         db_dir = opendir(db_path.buf);
71         if (!db_dir)
72                 ohshite(_("cannot read info directory"));
73
74         push_cleanup(cu_closedir, ~0, NULL, 0, 1, (void *)db_dir);
75         while ((db_de = readdir(db_dir)) != NULL) {
76                 const char *filename, *filetype, *dot;
77
78                 debug(dbg_veryverbose, "infodb foreach info file '%s'",
79                       db_de->d_name);
80
81                 /* Ignore dotfiles, including ‘.’ and ‘..’. */
82                 if (db_de->d_name[0] == '.')
83                         continue;
84
85                 /* Ignore anything odd. */
86                 dot = strrchr(db_de->d_name, '.');
87                 if (dot == NULL)
88                         continue;
89
90                 /* Ignore files from other packages. */
91                 if (strlen(pkg->set->name) != (size_t)(dot - db_de->d_name) ||
92                     strncmp(db_de->d_name, pkg->set->name, dot - db_de->d_name))
93                         continue;
94
95                 debug(dbg_stupidlyverbose, "infodb foreach file this pkg");
96
97                 /* Skip past the full stop. */
98                 filetype = dot + 1;
99
100                 varbuf_trunc(&db_path, db_path_len);
101                 varbuf_add_str(&db_path, db_de->d_name);
102                 varbuf_end_str(&db_path);
103                 filename = db_path.buf;
104
105                 func(filename, filetype);
106         }
107         pop_cleanup(ehflag_normaltidy); /* closedir */
108
109         varbuf_destroy(&db_path);
110 }