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Skip foreign tablespaces when running pg_checksums/pg_verify_checksums
Attempting to use pg_checksums (pg_verify_checksums in 11) on a data folder which includes tablespace paths used across multiple major versions would cause pg_checksums to scan all directories present in pg_tblspc, and not only marked with TABLESPACE_VERSION_DIRECTORY. This could lead to failures when for example running sanity checks on an upgraded instance with --check. Even worse, it was possible to rewrite on-disk pages with --enable for a cluster potentially online. This commit makes pg_checksums skip any directories not named TABLESPACE_VERSION_DIRECTORY, similarly to what is done for base backups. Reported-by: Michael Banck Author: Michael Banck, Bernd Helmle Discussion: https://postgr.es/m/62031974fd8e941dd8351fbc8c7eff60d59c5338.camel@credativ.de backpatch-through: 11
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@ -385,7 +385,52 @@ scan_directory(const char *basedir, const char *subdir, bool sizeonly)
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#else
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else if (S_ISDIR(st.st_mode) || pgwin32_is_junction(fn))
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#endif
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dirsize += scan_directory(path, de->d_name, sizeonly);
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{
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/*
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* If going through the entries of pg_tblspc, we assume to operate
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* on tablespace locations where only TABLESPACE_VERSION_DIRECTORY
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* is valid, resolving the linked locations and dive into them
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* directly.
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*/
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if (strncmp("pg_tblspc", subdir, strlen("pg_tblspc")) == 0)
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{
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char tblspc_path[MAXPGPATH];
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struct stat tblspc_st;
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/*
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* Resolve tablespace location path and check whether
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* TABLESPACE_VERSION_DIRECTORY exists. Not finding a valid
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* location is unexpected, since there should be no orphaned
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* links and no links pointing to something else than a
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* directory.
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*/
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snprintf(tblspc_path, sizeof(tblspc_path), "%s/%s/%s",
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path, de->d_name, TABLESPACE_VERSION_DIRECTORY);
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if (lstat(tblspc_path, &tblspc_st) < 0)
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{
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pg_log_error("could not stat file \"%s\": %m",
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tblspc_path);
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exit(1);
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}
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/*
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* Move backwards once as the scan needs to happen for the
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* contents of TABLESPACE_VERSION_DIRECTORY.
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*/
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snprintf(tblspc_path, sizeof(tblspc_path), "%s/%s",
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path, de->d_name);
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/* Looks like a valid tablespace location */
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dirsize += scan_directory(tblspc_path,
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TABLESPACE_VERSION_DIRECTORY,
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sizeonly);
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}
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else
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{
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dirsize += scan_directory(path, de->d_name, sizeonly);
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}
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}
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}
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closedir(dir);
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return dirsize;
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@ -5,7 +5,7 @@ use strict;
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use warnings;
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use PostgresNode;
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use TestLib;
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use Test::More tests => 62;
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use Test::More tests => 63;
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# Utility routine to create and check a table with corrupted checksums
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@ -217,6 +217,13 @@ sub fail_corrupt
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# Stop instance for the follow-up checks.
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$node->stop;
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# Create a fake tablespace location that should not be scanned
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# when verifying checksums.
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mkdir "$tablespace_dir/PG_99_999999991/";
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append_to_file "$tablespace_dir/PG_99_999999991/foo", "123";
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command_ok([ 'pg_checksums', '--check', '-D', $pgdata ],
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"succeeds with foreign tablespace");
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# Authorized relation files filled with corrupted data cause the
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# checksum checks to fail. Make sure to use file names different
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# than the previous ones.
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