diff options
Diffstat (limited to 'libblkid/save.c')
| -rw-r--r-- | libblkid/save.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/libblkid/save.c b/libblkid/save.c deleted file mode 100644 index c94cc2a82..000000000 --- a/libblkid/save.c +++ /dev/null @@ -1,227 +0,0 @@ -/* - * save.c - write the cache struct to disk - * - * Copyright (C) 2001 by Andreas Dilger - * Copyright (C) 2003 Theodore Ts'o - * - * %Begin-Header% - * This file may be redistributed under the terms of the - * GNU Lesser General Public License. - * %End-Header% - */ - -#include <stdio.h> -#include <string.h> -#include <stdlib.h> -#include <unistd.h> -#include <sys/types.h> -#ifdef HAVE_SYS_STAT_H -#include <sys/stat.h> -#endif -#ifdef HAVE_ERRNO_H -#include <errno.h> -#endif -#include "blkidP.h" - -static int save_dev(blkid_dev dev, FILE *file) -{ - struct list_head *p; - - if (!dev || dev->bid_name[0] != '/') - return 0; - - DBG(DEBUG_SAVE, - printf("device %s, type %s\n", dev->bid_name, dev->bid_type ? - dev->bid_type : "(null)")); - - fprintf(file, "<device DEVNO=\"0x%04lx\" TIME=\"%ld.%ld\"", - (unsigned long) dev->bid_devno, - (long) dev->bid_time, - (long) dev->bid_utime); - - if (dev->bid_pri) - fprintf(file, " PRI=\"%d\"", dev->bid_pri); - list_for_each(p, &dev->bid_tags) { - blkid_tag tag = list_entry(p, struct blkid_struct_tag, bit_tags); - fprintf(file, " %s=\"%s\"", tag->bit_name,tag->bit_val); - } - fprintf(file, ">%s</device>\n", dev->bid_name); - - return 0; -} - -/* - * Write out the cache struct to the cache file on disk. - */ -int blkid_flush_cache(blkid_cache cache) -{ - struct list_head *p; - char *tmp = NULL; - char *opened = NULL; - char *filename; - FILE *file = NULL; - int fd, ret = 0; - struct stat st; - - if (!cache) - return -BLKID_ERR_PARAM; - - if (list_empty(&cache->bic_devs) || - !(cache->bic_flags & BLKID_BIC_FL_CHANGED)) { - DBG(DEBUG_SAVE, printf("skipping cache file write\n")); - return 0; - } - - filename = cache->bic_filename ? cache->bic_filename : - blkid_get_cache_filename(NULL); - if (!filename) - return -BLKID_ERR_PARAM; - - if (strncmp(filename, - BLKID_RUNTIME_DIR "/", sizeof(BLKID_RUNTIME_DIR)) == 0) { - - /* default destination, create the directory if necessary */ - if (stat(BLKID_RUNTIME_DIR, &st) - && errno == ENOENT - && mkdir(BLKID_RUNTIME_DIR, S_IWUSR| - S_IRUSR|S_IRGRP|S_IROTH| - S_IXUSR|S_IXGRP|S_IXOTH) != 0 - && errno != EEXIST) { - DBG(DEBUG_SAVE, - printf("can't create %s directory for cache file\n", - BLKID_RUNTIME_DIR)); - return 0; - } - } - - /* If we can't write to the cache file, then don't even try */ - if (((ret = stat(filename, &st)) < 0 && errno != ENOENT) || - (ret == 0 && access(filename, W_OK) < 0)) { - DBG(DEBUG_SAVE, - printf("can't write to cache file %s\n", filename)); - return 0; - } - - /* - * Try and create a temporary file in the same directory so - * that in case of error we don't overwrite the cache file. - * If the cache file doesn't yet exist, it isn't a regular - * file (e.g. /dev/null or a socket), or we couldn't create - * a temporary file then we open it directly. - */ - if (ret == 0 && S_ISREG(st.st_mode)) { - tmp = malloc(strlen(filename) + 8); - if (tmp) { - sprintf(tmp, "%s-XXXXXX", filename); - fd = mkstemp(tmp); - if (fd >= 0) { - if (fchmod(fd, 0644) != 0) - DBG(DEBUG_SAVE, printf("%s: fchmod failed\n", filename)); - else if ((file = fdopen(fd, "w"))) - opened = tmp; - if (!file) - close(fd); - } - } - } - - if (!file) { - file = fopen(filename, "w"); - opened = filename; - } - - DBG(DEBUG_SAVE, - printf("writing cache file %s (really %s)\n", - filename, opened)); - - if (!file) { - ret = errno; - goto errout; - } - - list_for_each(p, &cache->bic_devs) { - blkid_dev dev = list_entry(p, struct blkid_struct_dev, bid_devs); - if (!dev->bid_type || (dev->bid_flags & BLKID_BID_FL_REMOVABLE)) - continue; - if ((ret = save_dev(dev, file)) < 0) - break; - } - - if (ret >= 0) { - cache->bic_flags &= ~BLKID_BIC_FL_CHANGED; - ret = 1; - } - - fclose(file); - if (opened != filename) { - if (ret < 0) { - unlink(opened); - DBG(DEBUG_SAVE, - printf("unlinked temp cache %s\n", opened)); - } else { - char *backup; - - backup = malloc(strlen(filename) + 5); - if (backup) { - sprintf(backup, "%s.old", filename); - unlink(backup); - if (link(filename, backup)) { - DBG(DEBUG_SAVE, - printf("can't link %s to %s\n", - filename, backup)); - } - free(backup); - } - if (rename(opened, filename)) { - ret = errno; - DBG(DEBUG_SAVE, - printf("can't rename %s to %s\n", - opened, filename)); - } else { - DBG(DEBUG_SAVE, - printf("moved temp cache %s\n", opened)); - } - } - } - -errout: - free(tmp); - if (filename != cache->bic_filename) - free(filename); - return ret; -} - -#ifdef TEST_PROGRAM -int main(int argc, char **argv) -{ - blkid_cache cache = NULL; - int ret; - - blkid_init_debug(DEBUG_ALL); - if (argc > 2) { - fprintf(stderr, "Usage: %s [filename]\n" - "Test loading/saving a cache (filename)\n", argv[0]); - exit(1); - } - - if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) { - fprintf(stderr, "%s: error creating cache (%d)\n", - argv[0], ret); - exit(1); - } - if ((ret = blkid_probe_all(cache)) < 0) { - fprintf(stderr, "error (%d) probing devices\n", ret); - exit(1); - } - cache->bic_filename = strdup(argv[1]); - - if ((ret = blkid_flush_cache(cache)) < 0) { - fprintf(stderr, "error (%d) saving cache\n", ret); - exit(1); - } - - blkid_put_cache(cache); - - return ret; -} -#endif |