1 Jeremy Bornstein wrote:
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.
11 To use this patch, run these commands for a successful build:
13 patch -p1 <patches/date-only.diff
14 ./configure (optional if already run)
17 diff --git a/generator.c b/generator.c
20 @@ -63,6 +63,7 @@ extern int append_mode;
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 OFF_T min_size;
28 @@ -696,6 +697,9 @@ void itemize(const char *fnamecmp, struct file_struct *file, int ndx, int statre
29 /* Perform our quick-check heuristic for determining if a file is unchanged. */
30 int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
33 + return cmp_time(st->st_mtime, file->modtime) == 0;
35 if (st->st_size != F_LENGTH(file))
38 diff --git a/options.c b/options.c
41 @@ -105,6 +105,7 @@ int keep_partial = 0;
42 int safe_symlinks = 0;
43 int copy_unsafe_links = 0;
46 int daemon_bwlimit = 0;
49 @@ -387,6 +388,7 @@ void usage(enum logcode F)
50 rprintf(F," --contimeout=SECONDS set daemon connection timeout in seconds\n");
51 rprintf(F," -I, --ignore-times don't skip files that match in size and mod-time\n");
52 rprintf(F," --size-only skip files that match in size\n");
53 + rprintf(F," --date-only skip files that match in mod-time\n");
54 rprintf(F," --modify-window=NUM compare mod-times with reduced accuracy\n");
55 rprintf(F," -T, --temp-dir=DIR create temporary files in directory DIR\n");
56 rprintf(F," -y, --fuzzy find similar file for basis if no dest file\n");
57 @@ -527,6 +529,7 @@ static struct poptOption long_options[] = {
58 {"chmod", 0, POPT_ARG_STRING, 0, OPT_CHMOD, 0, 0 },
59 {"ignore-times", 'I', POPT_ARG_NONE, &ignore_times, 0, 0, 0 },
60 {"size-only", 0, POPT_ARG_NONE, &size_only, 0, 0, 0 },
61 + {"date-only", 0, POPT_ARG_NONE, &date_only, 0, 0, 0 },
62 {"one-file-system", 'x', POPT_ARG_NONE, 0, 'x', 0, 0 },
63 {"no-one-file-system",'x',POPT_ARG_VAL, &one_file_system, 0, 0, 0 },
64 {"no-x", 'x', POPT_ARG_VAL, &one_file_system, 0, 0, 0 },
65 @@ -1927,6 +1930,9 @@ void server_options(char **args, int *argc_p)
70 + args[ac++] = "--date-only";
72 if (modify_window_set) {
73 if (asprintf(&arg, "--modify-window=%d", modify_window) < 0)
75 diff --git a/rsync.yo b/rsync.yo
78 @@ -382,6 +382,7 @@ to the detailed description below for a complete description. verb(
79 --contimeout=SECONDS set daemon connection timeout in seconds
80 -I, --ignore-times don't skip files that match size and time
81 --size-only skip files that match in size
82 + --date-only skip files that match in mod-time
83 --modify-window=NUM compare mod-times with reduced accuracy
84 -T, --temp-dir=DIR create temporary files in directory DIR
85 -y, --fuzzy find similar file for basis if no dest file
86 @@ -502,6 +503,12 @@ time to just looking for files that have changed in size. This is useful
87 when starting to use rsync after using another mirroring system which may
88 not preserve timestamps exactly.
90 +dit(bf(--date-only)) Normally rsync will skip any files that are
91 +already the same size and have the same modification time-stamp. With the
92 +--date-only option, files will be skipped if they have the same
93 +timestamp, regardless of size. This may be useful when the remote
94 +files have passed through a size-changing filter, e.g. for encryption.
96 dit(bf(--modify-window)) When comparing two timestamps, rsync treats the
97 timestamps as being equal if they differ by no more than the modify-window
98 value. This is normally 0 (for an exact match), but you may find it useful