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In base backup, only include our own tablespace version directory.

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If you have clusters of different versions pointing to the same tablespace
location, we would incorrectly include all the data belonging to the other
versions, too.

Fixes bug #7986, reported by Sergey Burladyan.
This commit is contained in:
Heikki Linnakangas 2013-03-25 20:19:22 +02:00
parent d298b50a3b
commit 28ba260906
1 changed files with 55 additions and 13 deletions
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68
src/backend/replication/basebackup.c
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@ -19,6 +19,7 @@
#include "access/xlog_internal.h" /* for pg_start/stop_backup */
#include "catalog/pg_type.h"
#include "common/relpath.h"
#include "lib/stringinfo.h"
#include "libpq/libpq.h"
#include "libpq/pqformat.h"
@ -45,6 +46,7 @@ typedef struct
static int64 sendDir(char *path, int basepathlen, bool sizeonly);
static int64 sendTablespace(char *path, bool sizeonly);
static bool sendFile(char *readfilename, char *tarfilename,
struct stat * statbuf, bool missing_ok);
static void sendFileWithContent(const char *filename, const char *content);
@ -146,7 +148,7 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
ti = palloc(sizeof(tablespaceinfo));
ti->oid = pstrdup(de->d_name);
ti->path = pstrdup(linkpath);
ti->size = opt->progress ? sendDir(linkpath, strlen(linkpath), true) : -1;
ti->size = opt->progress ? sendTablespace(fullpath, true) : -1;
tablespaces = lappend(tablespaces, ti);
#else
@ -181,29 +183,26 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
pq_sendint(&buf, 0, 2); /* natts */
pq_endmessage(&buf);
/* In the main tar, include the backup_label first. */
if (ti->path == NULL)
sendFileWithContent(BACKUP_LABEL_FILE, labelfile);
sendDir(ti->path == NULL ? "." : ti->path,
ti->path == NULL ? 1 : strlen(ti->path),
false);
/* In the main tar, include pg_control last. */
if (ti->path == NULL)
{
struct stat statbuf;
/* In the main tar, include the backup_label first... */
sendFileWithContent(BACKUP_LABEL_FILE, labelfile);
/* ... then the bulk of the files ... */
sendDir(".", 1, false);
/* ... and pg_control after everything else. */
if (lstat(XLOG_CONTROL_FILE, &statbuf) != 0)
{
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not stat control file \"%s\": %m",
XLOG_CONTROL_FILE)));
}
sendFile(XLOG_CONTROL_FILE, XLOG_CONTROL_FILE, &statbuf, false);
}
else
sendTablespace(ti->path, false);
/*
* If we're including WAL, and this is the main data directory we
@ -728,6 +727,49 @@ sendFileWithContent(const char *filename, const char *content)
}
}
/*
* Include the tablespace directory pointed to by 'path' in the output tar
* stream. If 'sizeonly' is true, we just calculate a total length and return
* it, without actually sending anything.
*/
static int64
sendTablespace(char *path, bool sizeonly)
{
int64 size;
char pathbuf[MAXPGPATH];
struct stat statbuf;
/*
* 'path' points to the tablespace location, but we only want to include
* the version directory in it that belongs to us.
*/
snprintf(pathbuf, sizeof(pathbuf), "%s/%s", path,
TABLESPACE_VERSION_DIRECTORY);
/*
* Store a directory entry in the tar file so we get the permissions right.
*/
if (lstat(pathbuf, &statbuf) != 0)
{
if (errno != ENOENT)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not stat file or directory \"%s\": %m",
pathbuf)));
/* If the tablespace went away while scanning, it's no error. */
return 0;
}
if (!sizeonly)
_tarWriteHeader(TABLESPACE_VERSION_DIRECTORY, NULL, &statbuf);
size = 512; /* Size of the header just added */
/* Send all the files in the tablespace version directory */
size += sendDir(pathbuf, strlen(path), sizeonly);
return size;
}
/*
* Include all files from the given directory in the output tar stream. If
* 'sizeonly' is true, we just calculate a total length and return it, without