1 /* pkg_alternatives.c - the opkg package management system
3 Copyright (C) 2017 Yousong Zhou
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2, or (at
8 your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
17 #include <sys/types.h> /* stat */
19 #include <libgen.h> /* dirname */
22 #include "file_util.h"
23 #include "libbb/libbb.h"
24 #include "opkg_message.h"
27 #include "pkg_alternatives.h"
28 #include "sprintf_alloc.h"
30 struct alternative_provider {
35 static const struct alternative_provider providers[] = {
38 .altpath = "/bin/busybox",
42 static const char *pkg_alternatives_check_providers(const char *path)
49 for (i = 0; i < ARRAY_SIZE(providers); i++) {
50 pkg = pkg_hash_fetch_installed_by_name(providers[i].name);
54 files = pkg_get_installed_files(pkg);
55 for (iter = str_list_first(files); iter; iter = str_list_next(files, iter)) {
56 if (!strcmp(path, (char *)(iter->data))) {
57 pkg_free_installed_files(pkg);
58 return providers[i].altpath;
61 pkg_free_installed_files(pkg);
66 static int pkg_alternatives_update_path(pkg_t *pkg, const pkg_vec_t *installed, const char *path)
68 struct pkg_alternatives *pkg_alts;
69 struct pkg_alternative *the_alt = NULL;
74 const char *target_path = NULL;
76 for (i = 0; i < installed->len; i++) {
77 pkg_t *pkg = installed->pkgs[i];
78 pkg_alts = pkg_get_ptr(pkg, PKG_ALTERNATIVES);
82 for (j = 0; j < pkg_alts->nalts; j++) {
83 struct pkg_alternative *alt = pkg_alts->alts[j];
85 if (strcmp(path, alt->path))
87 if (!the_alt || the_alt->prio < alt->prio) {
94 /* path is assumed to be an absolute one */
95 sprintf_alloc(&path_in_dest, "%s%s", the_pkg->dest->root_dir, &path[1]);
100 target_path = the_alt->altpath;
102 target_path = pkg_alternatives_check_providers(path);
108 r = lstat(path_in_dest, &sb);
112 if (!S_ISLNK(sb.st_mode)) {
113 opkg_msg(ERROR, "%s exists but is not a symlink\n", path_in_dest);
117 realpath = xreadlink(path_in_dest);
118 if (realpath && strcmp(realpath, target_path))
119 unlink(path_in_dest);
121 } else if (errno != ENOENT) {
125 char *path_copy = xstrdup(path_in_dest);
126 char *path_parent = dirname(path_copy);
128 r = file_mkdir_hier(path_parent, 0755);
133 r = symlink(target_path, path_in_dest);
134 if (r && errno == EEXIST) {
136 * the strcmp & unlink check above will make sure that if EEXIST
137 * happens, the symlink target also matches
142 opkg_perror(ERROR, "failed symlinking %s -> %s", path_in_dest, target_path);
146 unlink(path_in_dest);
155 int pkg_alternatives_update(pkg_t * pkg)
159 struct pkg_alternatives *pkg_alts;
160 struct pkg_alternative *alt = NULL;
161 pkg_vec_t *installed;
163 pkg_alts = pkg_get_ptr(pkg, PKG_ALTERNATIVES);
167 installed = pkg_vec_alloc();
168 pkg_hash_fetch_all_installed(installed);
169 for (i = 0; i < pkg_alts->nalts; i++) {
170 alt = pkg_alts->alts[i];
171 r |= pkg_alternatives_update_path(pkg, installed, alt->path);
173 pkg_vec_free(installed);