From: Art Cancro <ajc@citadel.org>
Date: Tue, 16 Apr 2024 15:20:56 +0000 (-0700)
Subject: Test for existing BDB files (not used yet)
X-Git-Tag: v1000~32
X-Git-Url: https://code.citadel.org/?p=citadel.git;a=commitdiff_plain;h=892419cf4747c1c0abea8d1e9bed8ca692aed8eb

Test for existing BDB files (not used yet)
---

diff --git a/citadel/server/backends/common/database.c b/citadel/server/backends/common/database.c
index 67022f743..a07dd22e6 100644
--- a/citadel/server/backends/common/database.c
+++ b/citadel/server/backends/common/database.c
@@ -1,6 +1,5 @@
-// Copyright (c) 1987-2023 by the citadel.org team
-// This program is open source software.  Use, duplication, or disclosure
-// is subject to the terms of the GNU General Public License, version 3.
+// Copyright (c) 1987-2024 by the citadel.org team
+// This program is open source software.  Use, duplication, or disclosure is subject to the GNU General Public License version 3.
 
 // The functions in this file handle the selection and activation of a storage backend for Citadel Server.
 // Right now, it simply activates Berkeley DB because that's the only one we have.
@@ -43,7 +42,22 @@ void			(*cdb_tick)(void)					= NULL;
 
 // This function is responsible for choosing and initializing a back end.
 void cdb_init_backends(void) {
-	cdb_chmod_data();
+
+	cdb_chmod_data();		// Set file level permissions so we can actually access the data files
+
+	// Test for Berkeley DB (this does nothing yet -- we're preparing to test for multiple back ends in the future)
+	int fd = open(ctdl_db_dir"/cdb.00", O_RDONLY);
+	if (fd) {
+		char junk[12];
+		uint32_t magic;
+		read(fd, junk, 12);	// throw the first 12 bytes away
+		read(fd, &magic, sizeof(magic));
+		if (magic == 0x00053162) {
+			syslog(LOG_DEBUG, "db: found existing Citadel database in Berkeley DB format");
+		}
+		close(fd);
+	}
+
 	bdb_init_backend();		// for now, this is the only one, so we select it always.
 }