1 Greetings, and thanks for all of your work on the wonderful rsync!
3 I recently had the need to transfer files only with different mod
4 dates (and to *not* transfer them based on file size differences).
5 This is because I'm backing up files remotely on an untrusted machine,
6 so I'm encrypting them with gpg before transfer. I discovered that
7 rsync didn't already have a --date-only flag, so I added one and am
8 enclosing the diffs in case you (as I hope) decide to include this
9 option in future releases.
16 [Patched update to have context and apply to latest CVS source.]
18 --- orig/generator.c 2005-02-03 02:04:20
19 +++ generator.c 2004-11-11 22:15:27
20 @@ -43,6 +43,7 @@ extern int inplace;
21 extern int make_backups;
22 extern int csum_length;
23 extern int ignore_times;
24 +extern int date_only;
26 extern OFF_T max_size;
27 extern int io_timeout;
28 @@ -81,6 +82,8 @@ static int unchanged_attrs(struct file_s
29 /* Perform our quick-check heuristic for determining if a file is unchanged. */
30 static int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
33 + return cmp_modtime(st->st_mtime, file->modtime) == 0;
34 if (st->st_size != file->length)
37 --- orig/options.c 2005-02-01 10:39:22
38 +++ options.c 2005-01-28 19:14:15
39 @@ -88,6 +88,7 @@ int keep_partial = 0;
40 int safe_symlinks = 0;
41 int copy_unsafe_links = 0;
44 int daemon_bwlimit = 0;
46 size_t bwlimit_writemax = 0;
47 @@ -298,6 +299,7 @@ void usage(enum logcode F)
48 rprintf(F," --timeout=TIME set I/O timeout in seconds\n");
49 rprintf(F," -I, --ignore-times don't skip files that match in size and mod-time\n");
50 rprintf(F," --size-only skip files that match in size\n");
51 + rprintf(F," --date-only skip files that match in mod-time\n");
52 rprintf(F," --modify-window=NUM compare mod-times with reduced accuracy\n");
53 rprintf(F," -T, --temp-dir=DIR create temporary files in directory DIR\n");
54 rprintf(F," --compare-dest=DIR also compare destination files relative to DIR\n");
55 @@ -352,6 +354,7 @@ static struct poptOption long_options[]
56 {"password-file", 0, POPT_ARG_STRING, &password_file, 0, 0, 0 },
57 {"ignore-times", 'I', POPT_ARG_NONE, &ignore_times, 0, 0, 0 },
58 {"size-only", 0, POPT_ARG_NONE, &size_only, 0, 0, 0 },
59 + {"date-only", 0, POPT_ARG_NONE, &date_only, 0, 0, 0 },
60 {"modify-window", 0, POPT_ARG_INT, &modify_window, OPT_MODIFY_WINDOW, 0, 0 },
61 {"one-file-system", 'x', POPT_ARG_NONE, &one_file_system, 0, 0, 0 },
62 {"existing", 0, POPT_ARG_NONE, &only_existing, 0, 0, 0 },
63 @@ -1247,6 +1250,9 @@ void server_options(char **args,int *arg
65 args[ac++] = "--size-only";
68 + args[ac++] = "--date-only";
70 if (modify_window_set) {
71 if (asprintf(&arg, "--modify-window=%d", modify_window) < 0)
73 --- orig/rsync.yo 2005-02-01 10:39:23
74 +++ rsync.yo 2005-01-28 19:14:37
75 @@ -349,6 +349,7 @@ to the detailed description below for a
76 --timeout=TIME set I/O timeout in seconds
77 -I, --ignore-times don't skip files that match size and time
78 --size-only skip files that match in size
79 + --date-only skip files that match in mod-time
80 --modify-window=NUM compare mod-times with reduced accuracy
81 -T --temp-dir=DIR create temporary files in directory DIR
82 --compare-dest=DIR also compare received files relative to DIR
83 @@ -434,6 +435,12 @@ regardless of timestamp. This is useful
84 after using another mirroring system which may not preserve timestamps
87 +dit(bf(--date-only)) Normally rsync will skip any files that are
88 +already the same size and have the same modification time-stamp. With the
89 +--date-only option, files will be skipped if they have the same
90 +timestamp, regardless of size. This may be useful when the remote
91 +files have passed through a size-changing filter, e.g. for encryption.
93 dit(bf(--modify-window)) When comparing two timestamps rsync treats
94 the timestamps as being equal if they are within the value of
95 modify_window. This is normally zero, but you may find it useful to