make_ext4fs/canned_fs_config.c
Jo-Philipp Wich af498dbd68 Support comments in fs config
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
2015-04-08 07:51:39 +02:00

113 lines
3.0 KiB
C

/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include "canned_fs_config.h"
typedef struct {
const char* path;
unsigned uid;
unsigned gid;
unsigned mode;
uint64_t capabilities;
} Path;
static Path* canned_data = NULL;
static int canned_alloc = 0;
static int canned_used = 0;
static int path_compare(const void* a, const void* b) {
return strcmp(((Path*)a)->path, ((Path*)b)->path);
}
int load_canned_fs_config(const char* fn) {
FILE* f = fopen(fn, "r");
if (f == NULL) {
fprintf(stderr, "failed to open %s: %s\n", fn, strerror(errno));
return -1;
}
char line[PATH_MAX + 200];
while (fgets(line, sizeof(line), f)) {
while (canned_used >= canned_alloc) {
canned_alloc = (canned_alloc+1) * 2;
canned_data = (Path*) realloc(canned_data, canned_alloc * sizeof(Path));
}
Path* p = canned_data + canned_used;
p->path = strdup(strtok(line, " \t"));
if (!p->path || !*p->path || *p->path == '#')
continue;
p->uid = atoi(strtok(NULL, " \t"));
p->gid = atoi(strtok(NULL, " \t"));
p->mode = strtol(strtok(NULL, " \t"), NULL, 8); // mode is in octal
p->capabilities = 0;
char* token = NULL;
do {
token = strtok(NULL, " \t");
if (token && strncmp(token, "capabilities=", 13) == 0) {
p->capabilities = strtoll(token+13, NULL, 0);
break;
}
} while (token);
canned_used++;
}
fclose(f);
qsort(canned_data, canned_used, sizeof(Path), path_compare);
printf("loaded %d fs_config entries\n", canned_used);
return 0;
}
int canned_fs_config(const char* path, int dir,
unsigned* uid, unsigned* gid, unsigned* mode, uint64_t* capabilities) {
Path key;
key.path = path;
Path* p = (Path*) bsearch(&key, canned_data, canned_used, sizeof(Path), path_compare);
if (p == NULL) {
return 0;
}
*uid = p->uid;
*gid = p->gid;
*mode = p->mode;
*capabilities = p->capabilities;
#if 0
// for debugging, run the built-in fs_config and compare the results.
unsigned c_uid, c_gid, c_mode;
uint64_t c_capabilities;
fs_config(path, dir, &c_uid, &c_gid, &c_mode, &c_capabilities);
if (c_uid != *uid) printf("%s uid %d %d\n", path, *uid, c_uid);
if (c_gid != *gid) printf("%s gid %d %d\n", path, *gid, c_gid);
if (c_mode != *mode) printf("%s mode 0%o 0%o\n", path, *mode, c_mode);
if (c_capabilities != *capabilities) printf("%s capabilities %llx %llx\n", path, *capabilities, c_capabilities);
#endif
return 1;
}