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/* pkg_alternatives.c - the opkg package management system
Copyright (C) 2017 Yousong Zhou
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; either version 2, or (at
your option) any later version.
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.
*/
#include <stdio.h>
#include <sys/types.h> /* stat */
#include <sys/stat.h>
#include <libgen.h> /* dirname */
#include <unistd.h>
#include "file_util.h"
#include "libbb/libbb.h"
#include "opkg_message.h"
#include "pkg.h"
#include "pkg_hash.h"
#include "pkg_alternatives.h"
#include "sprintf_alloc.h"
struct alternative_provider {
char *name;
char *altpath;
};
static const struct alternative_provider providers[] = {
{
.name = "busybox",
.altpath = "/bin/busybox",
},
};
static const char *pkg_alternatives_check_providers(const char *path)
{
pkg_t *pkg;
str_list_t *files;
str_list_elt_t *iter;
int i;
for (i = 0; i < ARRAY_SIZE(providers); i++) {
pkg = pkg_hash_fetch_installed_by_name(providers[i].name);
if (!pkg) {
continue;
}
files = pkg_get_installed_files(pkg);
for (iter = str_list_first(files); iter; iter = str_list_next(files, iter)) {
if (!strcmp(path, (char *)(iter->data))) {
pkg_free_installed_files(pkg);
return providers[i].altpath;
}
}
pkg_free_installed_files(pkg);
}
return NULL;
}
static int pkg_alternatives_update_path(pkg_t *pkg, const pkg_vec_t *installed, const char *path)
{
struct pkg_alternatives *pkg_alts;
struct pkg_alternative *the_alt = NULL;
pkg_t *the_pkg = pkg;
int i, j;
int r;
char *path_in_dest;
const char *target_path = NULL;
for (i = 0; i < installed->len; i++) {
pkg_t *pkg = installed->pkgs[i];
pkg_alts = pkg_get_ptr(pkg, PKG_ALTERNATIVES);
if (!pkg_alts)
continue;
for (j = 0; j < pkg_alts->nalts; j++) {
struct pkg_alternative *alt = pkg_alts->alts[j];
if (strcmp(path, alt->path))
continue;
if (!the_alt || the_alt->prio < alt->prio) {
the_pkg = pkg;
the_alt = alt;
}
}
}
/* path is assumed to be an absolute one */
sprintf_alloc(&path_in_dest, "%s%s", the_pkg->dest->root_dir, &path[1]);
if (!path_in_dest)
return -1;
if (the_alt) {
target_path = the_alt->altpath;
} else {
target_path = pkg_alternatives_check_providers(path);
}
if (target_path) {
struct stat sb;
r = lstat(path_in_dest, &sb);
if (!r) {
char *realpath;
if (!S_ISLNK(sb.st_mode)) {
opkg_msg(ERROR, "%s exists but is not a symlink\n", path_in_dest);
r = -1;
goto out;
}
realpath = xreadlink(path_in_dest);
if (realpath && strcmp(realpath, target_path))
unlink(path_in_dest);
free(realpath);
} else if (errno != ENOENT) {
goto out;
}
{
char *path_copy = xstrdup(path_in_dest);
char *path_parent = dirname(path_copy);
r = file_mkdir_hier(path_parent, 0755);
free(path_copy);
if (r) {
goto out;
}
r = symlink(target_path, path_in_dest);
if (r && errno == EEXIST) {
/*
* the strcmp & unlink check above will make sure that if EEXIST
* happens, the symlink target also matches
*/
r = 0;
}
if (r) {
opkg_perror(ERROR, "failed symlinking %s -> %s", path_in_dest, target_path);
}
}
} else {
unlink(path_in_dest);
r = 0;
}
out:
free(path_in_dest);
return r;
}
int pkg_alternatives_update(pkg_t * pkg)
{
int r = 0;
int i;
struct pkg_alternatives *pkg_alts;
struct pkg_alternative *alt = NULL;
pkg_vec_t *installed;
pkg_alts = pkg_get_ptr(pkg, PKG_ALTERNATIVES);
if (!pkg_alts)
return 0;
installed = pkg_vec_alloc();
pkg_hash_fetch_all_installed(installed);
for (i = 0; i < pkg_alts->nalts; i++) {
alt = pkg_alts->alts[i];
r |= pkg_alternatives_update_path(pkg, installed, alt->path);
}
pkg_vec_free(installed);
return r;
}
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