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)
19 @@ -61,6 +61,7 @@ extern int append_mode;
20 extern int make_backups;
21 extern int csum_length;
22 extern int ignore_times;
23 +extern int date_only;
25 extern OFF_T max_size;
26 extern OFF_T min_size;
27 @@ -619,6 +620,9 @@ void itemize(const char *fnamecmp, struc
28 /* Perform our quick-check heuristic for determining if a file is unchanged. */
29 int unchanged_file(char *fn, struct file_struct *file, STRUCT_STAT *st)
32 + return cmp_time(st->st_mtime, file->modtime) == 0;
34 if (st->st_size != F_LENGTH(file))
39 @@ -103,6 +103,7 @@ int keep_partial = 0;
40 int safe_symlinks = 0;
41 int copy_unsafe_links = 0;
44 int daemon_bwlimit = 0;
47 @@ -380,6 +381,7 @@ 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," -y, --fuzzy find similar file for basis if no dest file\n");
55 @@ -520,6 +522,7 @@ static struct poptOption long_options[]
56 {"chmod", 0, POPT_ARG_STRING, 0, OPT_CHMOD, 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 {"one-file-system", 'x', POPT_ARG_NONE, 0, 'x', 0, 0 },
61 {"update", 'u', POPT_ARG_NONE, &update_only, 0, 0, 0 },
62 {"existing", 0, POPT_ARG_NONE, &ignore_non_existing, 0, 0, 0 },
63 @@ -1897,6 +1900,9 @@ void server_options(char **args, int *ar
68 + args[ac++] = "--date-only";
70 if (modify_window_set) {
71 if (asprintf(&arg, "--modify-window=%d", modify_window) < 0)
75 @@ -382,6 +382,7 @@ 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 -y, --fuzzy find similar file for basis if no dest file
83 @@ -502,6 +503,12 @@ time to just looking for files that have
84 when starting to use rsync after using another mirroring system which may
85 not preserve timestamps exactly.
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 the
94 timestamps as being equal if they differ by no more than the modify-window
95 value. This is normally 0 (for an exact match), but you may find it useful