Adding upstream version 13.4.upstream/13.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/src/bin/pg_rewind/fetch.c b/src/bin/pg_rewind/fetch.c
new file mode 100644
index 0000000..f18fe53
--- /dev/null
+++ b/src/bin/pg_rewind/fetch.c
@@ -0,0 +1,60 @@
+/*-------------------------------------------------------------------------
+ *
+ * fetch.c
+ *	  Functions for fetching files from a local or remote data dir
+ *
+ * This file forms an abstraction of getting files from the "source".
+ * There are two implementations of this interface: one for copying files
+ * from a data directory via normal filesystem operations (copy_fetch.c),
+ * and another for fetching files from a remote server via a libpq
+ * connection (libpq_fetch.c)
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres_fe.h"
+
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "fetch.h"
+#include "file_ops.h"
+#include "filemap.h"
+#include "pg_rewind.h"
+
+void
+fetchSourceFileList(void)
+{
+	if (datadir_source)
+		traverse_datadir(datadir_source, &process_source_file);
+	else
+		libpqProcessFileList();
+}
+
+/*
+ * Fetch all relation data files that are marked in the given data page map.
+ */
+void
+executeFileMap(void)
+{
+	if (datadir_source)
+		copy_executeFileMap(filemap);
+	else
+		libpq_executeFileMap(filemap);
+}
+
+/*
+ * Fetch a single file into a malloc'd buffer. The file size is returned
+ * in *filesize. The returned buffer is always zero-terminated, which is
+ * handy for text files.
+ */
+char *
+fetchFile(const char *filename, size_t *filesize)
+{
+	if (datadir_source)
+		return slurpFile(datadir_source, filename, filesize);
+	else
+		return libpqGetFile(filename, filesize);
+}