From cd6aa5b5c0a8bcffe76f3c83071d80d93b7be533 Mon Sep 17 00:00:00 2001
From: Wayne Davison <wayned@samba.org>
Date: Tue, 7 Sep 2004 21:44:02 +0000
Subject: [PATCH] When --backup is used with --inplace, we make a copy of the
 destination file into its backup spot while generating the checksums.

---
 generator.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 47 insertions(+), 4 deletions(-)

diff --git a/generator.c b/generator.c
index 6d1f3491..860a7e6d 100644
--- a/generator.c
+++ b/generator.c
@@ -36,6 +36,8 @@ extern int preserve_uid;
 extern int preserve_gid;
 extern int update_only;
 extern int opt_ignore_existing;
+extern int inplace;
+extern int make_backups;
 extern int csum_length;
 extern int ignore_times;
 extern int size_only;
@@ -198,7 +200,7 @@ static void sum_sizes_sqroot(struct sum_struct *sum, uint64 len)
  *
  * Generate approximately one checksum every block_len bytes.
  */
-static void generate_and_send_sums(int fd, OFF_T len, int f_out)
+static void generate_and_send_sums(int fd, OFF_T len, int f_out, int f_copy)
 {
 	size_t i;
 	struct map_struct *mapbuf;
@@ -220,6 +222,9 @@ static void generate_and_send_sums(int fd, OFF_T len, int f_out)
 		uint32 sum1 = get_checksum1(map, n1);
 		char sum2[SUM_LENGTH];
 
+		if (f_copy >= 0)
+			full_write(f_copy, map, n1);
+
 		get_checksum2(map, n1, sum2);
 
 		if (verbose > 3) {
@@ -251,10 +256,11 @@ static void generate_and_send_sums(int fd, OFF_T len, int f_out)
 static void recv_generator(char *fname, struct file_struct *file, int i,
 			   int f_out)
 {
-	int fd;
+	int fd, f_copy;
 	STRUCT_STAT st, partial_st;
+	struct file_struct *back_file;
 	int statret, stat_errno;
-	char *fnamecmp, *partialptr;
+	char *fnamecmp, *partialptr, *backupptr;
 	char fnamecmpbuf[MAXPATHLEN];
 
 	if (list_only)
@@ -513,6 +519,7 @@ prepare_to_open:
 	if (fd == -1) {
 		rsyserr(FERROR, errno, "failed to open %s, continuing",
 			full_fname(fnamecmp));
+	    pretend_missing:
 		/* pretend the file didn't exist */
 		if (preserve_hard_links && hard_link_check(file, HL_SKIP))
 			return;
@@ -521,6 +528,36 @@ prepare_to_open:
 		return;
 	}
 
+	if (inplace && make_backups) {
+		if (!(backupptr = get_backup_name(fname))) {
+			close(fd);
+			return;
+		}
+		if (!(back_file = make_file(fname, NULL, NO_EXCLUDES))) {
+			close(fd);
+			goto pretend_missing;
+		}
+		if (robust_unlink(backupptr) && errno != ENOENT) {
+			rsyserr(FERROR, errno, "unlink %s",
+				full_fname(backupptr));
+			free(back_file);
+			close(fd);
+			return;
+		}
+		if ((f_copy = do_open(backupptr,
+		    O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600)) < 0) {
+			rsyserr(FERROR, errno, "open %s",
+				full_fname(backupptr));
+			free(back_file);
+			close(fd);
+			return;
+		}
+	} else {
+		backupptr = NULL;
+		back_file = NULL;
+		f_copy = -1;
+	}
+
 	if (verbose > 3) {
 		rprintf(FINFO, "gen mapped %s of size %.0f\n",
 			safe_fname(fnamecmp), (double)st.st_size);
@@ -530,7 +567,13 @@ prepare_to_open:
 		rprintf(FINFO, "generating and sending sums for %d\n", i);
 
 	write_int(f_out,i);
-	generate_and_send_sums(fd, st.st_size, f_out);
+	generate_and_send_sums(fd, st.st_size, f_out, f_copy);
+
+	if (f_copy >= 0) {
+		close(f_copy);
+		set_perms(backupptr, back_file, NULL, 0);
+		free(back_file);
+	}
 
 	close(fd);
 }
-- 
2.34.1