add parent_backup_link to pgBackup structure. No usage for now

src/catalog.c

@@ -256,6 +256,8 @@ catalog_get_backup_list(time_t requested_backup_id)
 	parray		   *backups = NULL;
 	pgBackup	   *backup = NULL;
 
+	int		i;
+
 	/* open backup instance backups directory */
 	date_dir = opendir(backup_instance_path);
 	if (date_dir == NULL)
@@ -283,6 +285,7 @@ catalog_get_backup_list(time_t requested_backup_id)
 		/* read backup information from BACKUP_CONTROL_FILE */
 		snprintf(backup_conf_path, MAXPGPATH, "%s/%s", date_path, BACKUP_CONTROL_FILE);
 		backup = readBackupControlFile(backup_conf_path);
+		backup->backup_id = backup->start_time;
 
 		/* ignore corrupted backups */
 		if (backup)
@@ -316,6 +319,30 @@ catalog_get_backup_list(time_t requested_backup_id)
 
 	parray_qsort(backups, pgBackupCompareIdDesc);
 
+	/* Link incremental backups with their ancestors.*/
+	for (i = 0; i < parray_num(backups); i++)
+	{
+		pgBackup *curr = parray_get(backups, i);
+
+		int j;
+
+		if (curr->backup_mode == BACKUP_MODE_FULL)
+			continue;
+
+		for (j = i+1; j < parray_num(backups); j++)
+		{
+			pgBackup *ancestor = parray_get(backups, j);
+
+			if (ancestor->start_time == curr->parent_backup)
+			{
+				curr->parent_backup_link = ancestor;
+				/* elog(INFO, "curr %s, ancestor %s j=%d", base36enc_dup(curr->start_time),
+						base36enc_dup(ancestor->start_time), j); */
+				break;
+			}
+		}
+	}
+
 	return backups;
 
 err_proc:

src/pg_probackup.h

@@ -184,6 +184,8 @@ typedef struct pgBackupConfig
 	int			compress_level;
 } pgBackupConfig;
 
+typedef struct pgBackup pgBackup;
+
 /* Information about single backup stored in backup.conf */
 typedef struct pgBackup
 {
@@ -226,6 +228,7 @@ typedef struct pgBackup
 	time_t			parent_backup; 	/* Identifier of the previous backup.
 									 * Which is basic backup for this
 									 * incremental backup. */
+	pgBackup		*parent_backup_link;
 	char			*primary_conninfo; /* Connection parameters of the backup
 										* in the format suitable for recovery.conf */
 } pgBackup;

src/restore.c

@@ -203,6 +203,7 @@ do_restore_or_validate(time_t target_backup_id,
 		}
 
 		/* If we already found dest_backup, look for full backup. */
+		/* TODO Now, as we have all backups linked, we can probably get rid of that?"*/
 		if (dest_backup)
 		{
 			if (current_backup->backup_mode == BACKUP_MODE_FULL)

src/util.c

@@ -315,6 +315,7 @@ pgBackup_init(pgBackup *backup)
 	backup->wal_block_size = XLOG_BLCKSZ;
 	backup->stream = false;
 	backup->parent_backup = 0;
+	backup->parent_backup_link = NULL;
 	backup->primary_conninfo = NULL;
 	backup->server_version[0] = '\0';
 }

src/validate.c

@@ -283,6 +283,7 @@ do_validate_instance(void)
 		elog(ERROR, "Failed to get backup list.");
 
 	/* Valiate each backup along with its xlog files. */
+	/* TODO Maybe use parent_backup_link instead of looking for backups in the list */
 	for (i = 0; i < parray_num(backups); i++)
 	{
 		pgBackup   *base_full_backup = NULL;