* RestoreArchivedFile * * Attempt to retrieve the specified file from off-line archival storage. * If successful, return a file descriptor of the restored file, else * return -1. * * For fixed-size files, the caller may pass the expected size as an * additional crosscheck on successful recovery. If the file size is not * known, set expectedSize = 0. */
| 36 | * known, set expectedSize = 0. |
| 37 | */ |
| 38 | int |
| 39 | RestoreArchivedFile(const char *path, const char *xlogfname, |
| 40 | off_t expectedSize, const char *restoreCommand) |
| 41 | { |
| 42 | char xlogpath[MAXPGPATH]; |
| 43 | char *xlogRestoreCmd; |
| 44 | int rc; |
| 45 | struct stat stat_buf; |
| 46 | |
| 47 | snprintf(xlogpath, MAXPGPATH, "%s/" XLOGDIR "/%s", path, xlogfname); |
| 48 | |
| 49 | xlogRestoreCmd = BuildRestoreCommand(restoreCommand, xlogpath, |
| 50 | xlogfname, NULL); |
| 51 | if (xlogRestoreCmd == NULL) |
| 52 | { |
| 53 | pg_log_fatal("cannot use restore_command with %%r placeholder"); |
| 54 | exit(1); |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Execute restore_command, which should copy the missing file from |
| 59 | * archival storage. |
| 60 | */ |
| 61 | rc = system(xlogRestoreCmd); |
| 62 | pfree(xlogRestoreCmd); |
| 63 | |
| 64 | if (rc == 0) |
| 65 | { |
| 66 | /* |
| 67 | * Command apparently succeeded, but let's make sure the file is |
| 68 | * really there now and has the correct size. |
| 69 | */ |
| 70 | if (stat(xlogpath, &stat_buf) == 0) |
| 71 | { |
| 72 | if (expectedSize > 0 && stat_buf.st_size != expectedSize) |
| 73 | { |
| 74 | pg_log_fatal("unexpected file size for \"%s\": %lld instead of %lld", |
| 75 | xlogfname, (long long int) stat_buf.st_size, |
| 76 | (long long int) expectedSize); |
| 77 | exit(1); |
| 78 | } |
| 79 | else |
| 80 | { |
| 81 | int xlogfd = open(xlogpath, O_RDONLY | PG_BINARY, 0); |
| 82 | |
| 83 | if (xlogfd < 0) |
| 84 | { |
| 85 | pg_log_fatal("could not open file \"%s\" restored from archive: %m", |
| 86 | xlogpath); |
| 87 | exit(1); |
| 88 | } |
| 89 | else |
| 90 | return xlogfd; |
| 91 | } |
| 92 | } |
| 93 | else |
| 94 | { |
| 95 | if (errno != ENOENT) |
nothing calls this directly
no test coverage detected