Adjust pg_upgrade to output a separate log file for pg_ctl output on

Windows, to avoid opening a file by multiple processes.

Author: bmomjian

contrib/pg_upgrade/option.c

@@ -57,7 +57,7 @@ parseCommandLine(int argc, char *argv[])
 	int			optindex = 0;	/* used by getopt_long */
 	int			os_user_effective_id;
 	FILE		*fp;
-	int			i;
+	char		**filename;
 	time_t		run_time = time(NULL);
 
 	user_opts.transfer_mode = TRANSFER_MODE_COPY;
@@ -188,11 +188,12 @@ parseCommandLine(int argc, char *argv[])
 	}
 
 	/* label start of upgrade in logfiles */
-	for (i = 0; i < NUM_LOG_FILES; i++)
+	for (filename = output_files; *filename != NULL; filename++)
 	{
-		if ((fp = fopen_priv(output_files[i], "a")) == NULL)
-			pg_log(PG_FATAL, "cannot write to log file %s\n",
-				   output_files[i]);
+		if ((fp = fopen_priv(*filename, "a")) == NULL)
+			pg_log(PG_FATAL, "cannot write to log file %s\n", *filename);
+
+		/* Start with newline because we might be appending to a file. */
 		fprintf(fp, "\n"
 		"-----------------------------------------------------------------\n"
 		"  pg_upgrade run on %s"

contrib/pg_upgrade/pg_upgrade.c

@@ -55,11 +55,16 @@ ClusterInfo old_cluster,
 			new_cluster;
 OSInfo		os_info;
 
-char *output_files[NUM_LOG_FILES] = {
+char *output_files[] = {
 	SERVER_LOG_FILE,
+#ifdef WIN32
+	/* file is unique on Win32 */
+	SERVER_LOG_FILE2,
+#endif
 	RESTORE_LOG_FILE,
 	UTILITY_LOG_FILE,
-	INTERNAL_LOG_FILE
+	INTERNAL_LOG_FILE,
+	NULL
 };
 
 
@@ -454,21 +459,14 @@ cleanup(void)
 	/* Remove dump and log files? */
 	if (!log_opts.retain)
 	{
-		char		filename[MAXPGPATH];
-		int i;
+		char		**filename;
 
-		for (i = 0; i < NUM_LOG_FILES; i++)
-		{
-			snprintf(filename, sizeof(filename), "%s", output_files[i]);
-			unlink(filename);
-		}
+		for (filename = output_files; *filename != NULL; filename++)
+			unlink(*filename);
 
 		/* remove SQL files */
-		snprintf(filename, sizeof(filename), "%s", ALL_DUMP_FILE);
-		unlink(filename);
-		snprintf(filename, sizeof(filename), "%s", GLOBALS_DUMP_FILE);
-		unlink(filename);
-		snprintf(filename, sizeof(filename), "%s", DB_DUMP_FILE);
-		unlink(filename);
+		unlink(ALL_DUMP_FILE);
+		unlink(GLOBALS_DUMP_FILE);
+		unlink(DB_DUMP_FILE);
 	}
 }

contrib/pg_upgrade/pg_upgrade.h

@@ -40,7 +40,6 @@
 #define UTILITY_LOG_FILE	"pg_upgrade_utility.log"
 #define INTERNAL_LOG_FILE	"pg_upgrade_internal.log"
 
-#define NUM_LOG_FILES		4
 extern char *output_files[];
 
 /*
@@ -49,8 +48,10 @@ extern char *output_files[];
  * On Win32, we can't send both pg_upgrade output and command output to the
  * same file because we get the error: "The process cannot access the file
  * because it is being used by another process." so send the pg_ctl
- * command-line output to the utility log file on Windows, rather than
- * into the server log file.
+ * command-line output to a new file, rather than into the server log file.
+ * Ideally we could use UTILITY_LOG_FILE for this, but some Windows platforms
+ * keep the pg_ctl output file open even after pg_ctl exits, perhaps by the
+ * running postmaster.
  *
  * We could use the Windows pgwin32_open() flags to allow shared file
  * writes but is unclear how all other tools would use those flags, so
@@ -60,7 +61,7 @@ extern char *output_files[];
 #ifndef WIN32
 #define SERVER_LOG_FILE2	SERVER_LOG_FILE
 #else
-#define SERVER_LOG_FILE2	UTILITY_LOG_FILE
+#define SERVER_LOG_FILE2	"pg_upgrade_server2.log"
 #endif