Optionally preserve atimes.

Based on https://bugzilla.samba.org/show_bug.cgi?id=7249#c1 by Nicolas George.

Index: rsync-3.1.0/options.c

===================================================================

--- rsync-3.1.0.orig/options.c

+++ rsync-3.1.0/options.c

@@ -125,6 +125,7 @@ int delay_updates = 0;

 long block_size = 0; /* "long" because popt can't set an int32. */

 char *skip_compress = NULL;

 item_list dparam_list = EMPTY_ITEM_LIST;

+int noatime = 0;

 /** Network address family. **/

 int default_af_hint

@@ -802,6 +803,7 @@ void usage(enum logcode F)

   rprintf(F,"     --iconv=CONVERT_SPEC    request charset conversion of filenames\n");

 #endif

   rprintf(F,"     --checksum-seed=NUM     set block/file checksum seed (advanced)\n");

+  rprintf(F,"     --noatime               do not alter atime when opening source files\n");

   rprintf(F," -4, --ipv4                  prefer IPv4\n");

   rprintf(F," -6, --ipv6                  prefer IPv6\n");

   rprintf(F,"     --version               print version number\n");

@@ -1019,6 +1021,7 @@ static struct poptOption long_options[]

   {"iconv",            0,  POPT_ARG_STRING, &iconv_opt, 0, 0, 0 },

   {"no-iconv",         0,  POPT_ARG_NONE,   0, OPT_NO_ICONV, 0, 0 },

 #endif

+  {"noatime",          0,  POPT_ARG_VAL,    &noatime, 1, 0, 0 },

   {"ipv4",            '4', POPT_ARG_VAL,    &default_af_hint, AF_INET, 0, 0 },

   {"ipv6",            '6', POPT_ARG_VAL,    &default_af_hint, AF_INET6, 0, 0 },

   {"8-bit-output",    '8', POPT_ARG_VAL,    &allow_8bit_chars, 1, 0, 0 },

@@ -2739,6 +2742,12 @@ void server_options(char **args, int *ar

 	if (preallocate_files && am_sender)

 		args[ac++] = "--preallocate";

+	/*

+	 * Do we want remote atime preservation when we preserve local ones?

+	if (noatime)

+		args[ac++] = "--noatime";

+	*/

+

 	if (ac > MAX_SERVER_ARGS) { /* Not possible... */

 		rprintf(FERROR, "argc overflow in server_options().\n");

 		exit_cleanup(RERR_MALLOC);

Index: rsync-3.1.0/rsync.yo

===================================================================

--- rsync-3.1.0.orig/rsync.yo

+++ rsync-3.1.0/rsync.yo

@@ -454,6 +454,7 @@ to the detailed description below for a

      --protocol=NUM          force an older protocol version to be used

      --iconv=CONVERT_SPEC    request charset conversion of filenames

      --checksum-seed=NUM     set block/file checksum seed (advanced)

+     --noatime               do not alter atime when opening source files

  -4, --ipv4                  prefer IPv4

  -6, --ipv6                  prefer IPv6

      --version               print version number

@@ -2543,6 +2544,13 @@ daemon uses the charset specified in its

 regardless of the remote charset you actually pass.  Thus, you may feel free to

 specify just the local charset for a daemon transfer (e.g. bf(--iconv=utf8)).

+dit(bf(--noatime)) Use the O_NOATIME open flag on systems that support it.

+The effect of this flag is to avoid altering the access time (atime) of the

+opened files.

+If the system does not support the O_NOATIME flag, this option does nothing.

+Currently, systems known to support O_NOATIME are Linux >= 2.6.8 with glibc

+>= 2.3.4.

+

 dit(bf(-4, --ipv4) or bf(-6, --ipv6)) Tells rsync to prefer IPv4/IPv6

 when creating sockets.  This only affects sockets that rsync has direct

 control over, such as the outgoing socket when directly contacting an

diff --git a/syscall.c b/syscall.c

index c46a8b4..6620563 100644

--- a/syscall.c

+++ b/syscall.c

@@ -42,6 +42,7 @@ extern int inplace;

 extern int preallocate_files;

 extern int preserve_perms;

 extern int preserve_executability;

+extern int noatime;

 #ifndef S_BLKSIZE

 # if defined hpux || defined __hpux__ || defined __hpux

@@ -189,6 +190,10 @@ int do_open(const char *pathname, int fl

 		RETURN_ERROR_IF(dry_run, 0);

 		RETURN_ERROR_IF_RO_OR_LO;

 	}

+#ifdef O_NOATIME

+	if (noatime)

+		flags |= O_NOATIME;

+#endif

 	return open(pathname, flags | O_BINARY, mode);

 }

Index: rsync/tls.c

===================================================================

--- rsync.orig/tls.c

+++ rsync/tls.c

@@ -53,6 +53,7 @@ int preserve_perms = 0;

 int preserve_executability = 0;

 int preallocate_files = 0;

 int inplace = 0;

+int noatime = 0;

 #ifdef SUPPORT_XATTRS

Index: rsync/t_unsafe.c

===================================================================

--- rsync.orig/t_unsafe.c

+++ rsync/t_unsafe.c

@@ -33,6 +33,10 @@ int preserve_perms = 0;

 int preserve_executability = 0;

 short info_levels[COUNT_INFO], debug_levels[COUNT_DEBUG];

+/* This is to make syscall.o shut up. */

+int noatime = 0;

+

+

 int

 main(int argc, char **argv)

 {

Index: rsync/wildtest.c

===================================================================

--- rsync.orig/wildtest.c

+++ rsync/wildtest.c

@@ -32,6 +32,9 @@ int fnmatch_errors = 0;

 int wildmatch_errors = 0;

+/* This is to make syscall.o shut up. */

+int noatime = 0;

+

 typedef char bool;

 int output_iterations = 0;

Index: rsync/trimslash.c

===================================================================

--- rsync.orig/trimslash.c

+++ rsync/trimslash.c

@@ -30,6 +30,7 @@ int preserve_perms = 0;

 int preserve_executability = 0;

 int preallocate_files = 0;

 int inplace = 0;

+int noatime = 0;

 int

 main(int argc, char **argv)