/*
* SetWALFileNameForCleanup()
*
* Set the earliest WAL filename that we want to keep on the archive
* and decide whether we need_cleanup
*/
static void
SetWALFileNameForCleanup(void)
{
bool fnameOK = false;
TrimExtension(restartWALFileName, additional_ext);
/*
* If restartWALFileName is a WAL file name then just use it directly. If
* restartWALFileName is a .backup filename, make sure we use the prefix
* of the filename, otherwise we will remove wrong files since
* 000000010000000000000010.00000020.backup is after
* 000000010000000000000010.
*/
if (strlen(restartWALFileName) == XLOG_DATA_FNAME_LEN &&
strspn(restartWALFileName, "0123456789ABCDEF") == XLOG_DATA_FNAME_LEN)
{
strcpy(exclusiveCleanupFileName, restartWALFileName);
fnameOK = true;
}
else if (strlen(restartWALFileName) == XLOG_BACKUP_FNAME_LEN)
{
int args;
uint32 tli = 1,
log = 0,
seg = 0,
offset = 0;
args = sscanf(restartWALFileName, "%08X%08X%08X.%08X.backup", &tli, &log, &seg, &offset);
if (args == 4)
{
fnameOK = true;
/*
* Use just the prefix of the filename, ignore everything after
* first period
*/
XLogFileName(exclusiveCleanupFileName, tli, log, seg);
}
}
if (!fnameOK)
{
fprintf(stderr, "%s: invalid filename input\n", progname);
fprintf(stderr, "Try \"%s --help\" for more information.\n", progname);
exit(2);
}
}
static void
CleanupPriorWALFiles(void)
{
int rc;
DIR *xldir;
struct dirent *xlde;
char walfile[MAXPGPATH];
if ((xldir = opendir(archiveLocation)) != NULL)
{
while (errno = 0, (xlde = readdir(xldir)) != NULL)
{
/*
* Truncation is essentially harmless, because we skip names of
* length other than XLOG_DATA_FNAME_LEN. (In principle, one
* could use a 1000-character additional_ext and get trouble.)
*/
strlcpy(walfile, xlde->d_name, MAXPGPATH);
TrimExtension(walfile, additional_ext);
/*
* We ignore the timeline part of the XLOG segment identifiers in
* deciding whether a segment is still needed. This ensures that
* we won't prematurely remove a segment from a parent timeline.
* We could probably be a little more proactive about removing
* segments of non-parent timelines, but that would be a whole lot
* more complicated.
*
* We use the alphanumeric sorting property of the filenames to
* decide which ones are earlier than the exclusiveCleanupFileName
* file. Note that this means files are not removed in the order
* they were originally written, in case this worries you.
*/
if (strlen(walfile) == XLOG_DATA_FNAME_LEN &&
strspn(walfile, "0123456789ABCDEF") == XLOG_DATA_FNAME_LEN &&
strcmp(walfile + 8, exclusiveCleanupFileName + 8) < 0)
{
/*
* Use the original file name again now, including any
* extension that might have been chopped off before testing
* the sequence.
*/
snprintf(WALFilePath, MAXPGPATH, "%s/%s",
archiveLocation, xlde->d_name);
if (dryrun)
{
/*
* Prints the name of the file to be removed and skips the
* actual removal. The regular printout is so that the
* user can pipe the output into some other program.
*/
printf("%s\n", WALFilePath);
if (debug)
fprintf(stderr,
"%s: file \"%s\" would be removed\n",
progname, WALFilePath);
continue;
}
if (debug)
fprintf(stderr, "%s: removing file \"%s\"\n",
progname, WALFilePath);
rc = unlink(WALFilePath);
if (rc != 0)
{
fprintf(stderr, "%s: ERROR: could not remove file \"%s\": %s\n",
progname, WALFilePath, strerror(errno));
break;
}
}
}
if (errno)
fprintf(stderr, "%s: could not read archive location \"%s\": %s\n",
progname, archiveLocation, strerror(errno));
if (closedir(xldir))
fprintf(stderr, "%s: could not close archive location \"%s\": %s\n",
progname, archiveLocation, strerror(errno));
}
else
fprintf(stderr, "%s: could not open archive location \"%s\": %s\n",
progname, archiveLocation, strerror(errno));
}
/*
* SetWALFileNameForCleanup()
*
* Set the earliest WAL filename that we want to keep on the archive
* and decide whether we need cleanup
*/
static void
SetWALFileNameForCleanup(void)
{
bool fnameOK = false;
TrimExtension(restartWALFileName, additional_ext);
/*
* If restartWALFileName is a WAL file name then just use it directly. If
* restartWALFileName is a .partial or .backup filename, make sure we use
* the prefix of the filename, otherwise we will remove wrong files since
* 000000010000000000000010.partial and
* 000000010000000000000010.00000020.backup are after
* 000000010000000000000010.
*/
if (IsXLogFileName(restartWALFileName))
{
strcpy(exclusiveCleanupFileName, restartWALFileName);
fnameOK = true;
}
else if (IsPartialXLogFileName(restartWALFileName))
{
int args;
uint32 tli = 1,
log = 0,
seg = 0;
args = sscanf(restartWALFileName, "%08X%08X%08X.partial",
&tli, &log, &seg);
if (args == 3)
{
fnameOK = true;
/*
* Use just the prefix of the filename, ignore everything after
* first period
*/
XLogFileNameById(exclusiveCleanupFileName, tli, log, seg);
}
}
else if (IsBackupHistoryFileName(restartWALFileName))
{
int args;
uint32 tli = 1,
log = 0,
seg = 0,
offset = 0;
args = sscanf(restartWALFileName, "%08X%08X%08X.%08X.backup", &tli, &log, &seg, &offset);
if (args == 4)
{
fnameOK = true;
/*
* Use just the prefix of the filename, ignore everything after
* first period
*/
XLogFileNameById(exclusiveCleanupFileName, tli, log, seg);
}
}
if (!fnameOK)
{
fprintf(stderr, "%s: invalid filename input\n", progname);
fprintf(stderr, "Try \"%s --help\" for more information.\n", progname);
exit(2);
}
}
