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pg_combinebackup: When reconstructing, avoid double slash in filename.

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This function is always called with a relative_path that ends in a
slash, so there's no need to insert a second one. So, don't. Instead,
add an assertion to verify that nothing gets broken in the future, and
adjust the comments.

While this is not a critical bug, the duplicate slash is visible in
error messages, which could create confusion, so back-patch to v17.
This is also better in that it keeps the code consistent across
branches.

Patch by me, reviewed by Bertrand Drouvot and Amul Sul.

Discussion: http://postgr.es/m/CA+TgmoaD7dBYPqe7kMtO0dyto7rd0rUh7joh=JPUSaFszKY6Pg@mail.gmail.com
This commit is contained in:
Robert Haas 2024-11-04 09:55:02 -05:00 committed by Muhammad Usama
parent e1cc4d9067
commit d9da4abc75
1 changed files with 9 additions and 4 deletions
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13
src/bin/pg_combinebackup/reconstruct.c
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@ -77,8 +77,9 @@ static void read_block(rfile *s, off_t off, uint8 *buffer);
*
* relative_path should be the path to the directory containing this file,
* relative to the root of the backup (NOT relative to the root of the
* tablespace). bare_file_name should be the name of the file within that
* directory, without "INCREMENTAL.".
* tablespace). It must always end with a trailing slash. bare_file_name
* should be the name of the file within that directory, without
* "INCREMENTAL.".
*
* n_prior_backups is the number of prior backups, and prior_backup_dirs is
* an array of pathnames where those backups can be found.
@ -111,6 +112,10 @@ reconstruct_from_incremental_file(char *input_filename,
rfile *copy_source = NULL;
pg_checksum_context checksum_ctx;
/* Sanity check the relative_path. */
Assert(relative_path[0] != '\0');
Assert(relative_path[strlen(relative_path) - 1] == '/');
/*
* Every block must come either from the latest version of the file or
* from one of the prior backups.
@ -174,11 +179,11 @@ reconstruct_from_incremental_file(char *input_filename,
* Look for the full file in the previous backup. If not found, then
* look for an incremental file instead.
*/
snprintf(source_filename, MAXPGPATH, "%s/%s/%s",
snprintf(source_filename, MAXPGPATH, "%s/%s%s",
prior_backup_dirs[sidx], relative_path, bare_file_name);
if ((s = make_rfile(source_filename, true)) == NULL)
{
snprintf(source_filename, MAXPGPATH, "%s/%s/INCREMENTAL.%s",
snprintf(source_filename, MAXPGPATH, "%s/%sINCREMENTAL.%s",
prior_backup_dirs[sidx], relative_path, bare_file_name);
s = make_incremental_rfile(source_filename);
}