Linux: Handle protected_regular in inplace writes (#241)

The Linux fs.protected_regular sysctl setting could cause rsync to fail to write a file in-place with the O_CREAT flag set, so the code now tries an open without O_CREAT when it might help to avoid an EACCES error.  A testsuite script is included (and slightly improved by Wayne to ensure that it outputs a SKIP when fs.protected_regular is turned off).

1 files changed, 6 insertions, 0 deletions

diff --git a/receiver.c b/receiver.c
index 091fcd6f..2cd84351 100644
--- a/receiver.c
+++ b/receiver.c
@@ -835,6 +835,12 @@ int recv_files(int f_in, int f_out, char *local_name)
 		if (inplace || one_inplace)  {
 			fnametmp = one_inplace ? partialptr : fname;
 			fd2 = do_open(fnametmp, O_WRONLY|O_CREAT, 0600);
+#ifdef linux
+			if (fd2 == -1 && errno == EACCES) {
+				/* Maybe the error was due to protected_regular setting? */
+				fd2 = do_open(fname, O_WRONLY, 0600);
+			}
+#endif
 			if (fd2 == -1) {
 				rsyserr(FERROR_XFER, errno, "open %s failed",
 					full_fname(fnametmp));