Please CC me directly as i'm not on the list.
I have attached a patch against latest CVS (cvs diff -u)
that adds the following functionality. I can break it up if
you would prefer it in pieces. Comments welcome.
o add compare-perms option
This creates a new inode for a file even if only
the perms have changed. This way if a file
outside of destdir is hardlinked to a dentry
inside destdir the permissions (uid, gid,
mode) will be untouched preserving history
etc.
o link-dest option
After setting compare_dest this causes
unchanged files in destdir to be hardlinked
to link-dest.
o modified make_exclude_list to support stdin
if --exclude-from has argument of "-"
stdin will be read.
This lets us pipe a include/exclude list
into rsync so that we can generate it on the
fly.
The upshot of these is to allow rsync to make incremental
backups without modifying earlier versions but keep every
version as a complete tree. It then becomes possible to
make tapes or restore from any image.
Although --compare-perms saves on block count this patch
only applies it to regular files so symlinks and device
nodes will still chew up inodes. :(
for the sake of an example here is the command line i'm using:
/site/bin/rsync -v --stats -a -H -e ssh --compare-perms
--delete --delete-excluded --numeric-ids --exclude-from -
--link-dest /e/backup1/home/update1/tree leto:/efs/home/
/e/backup1/home/update2/tree > /e/backup1/home/update2/log
i have tried to keep my changes small and consistent with the
existing coding style. Feel free to dink with it. I only
care about the performance.
--
________________________________________________________________
J.W. Schultz Pegasystems Technologies
email address: [EMAIL PROTECTED]
Remember Cernan and Schmitt
Index: exclude.c
===================================================================
RCS file: /cvsroot/rsync/exclude.c,v
retrieving revision 1.42
diff -u -r1.42 exclude.c
--- exclude.c 18 Feb 2002 19:10:28 -0000 1.42
+++ exclude.c 7 Mar 2002 20:56:02 -0000
@@ -219,8 +219,14 @@
int fatal, int include)
{
struct exclude_struct **list=list1;
- FILE *f = fopen(fname,"r");
+ FILE *f;
char line[MAXPATHLEN];
+
+ if (strcmp(fname, "-")) {
+ f = fopen(fname,"r");
+ } else {
+ f = fdopen(0, "r");
+ }
if (!f) {
if (fatal) {
rsyserr(FERROR, errno,
Index: generator.c
===================================================================
RCS file: /cvsroot/rsync/generator.c,v
retrieving revision 1.33
diff -u -r1.33 generator.c
--- generator.c 7 Feb 2002 16:36:12 -0000 1.33
+++ generator.c 7 Mar 2002 20:56:02 -0000
@@ -42,6 +42,8 @@
extern int always_checksum;
extern int modify_window;
extern char *compare_dest;
+extern int compare_perms;
+extern int link_dest;
/* choose whether to skip a particular file */
@@ -51,6 +53,15 @@
if (st->st_size != file->length) {
return 0;
}
+ if (compare_perms) {
+ if((st->st_mode & ~_S_IFMT) != (file->mode & ~_S_IFMT)) {
+ return 0;
+ }
+ if (st->st_uid != file->uid || st->st_gid != file->gid) {
+ return 0;
+ }
+ }
+
/* if always checksum is set then we use the checksum instead
of the file time to determine whether to sync */
@@ -352,6 +363,17 @@
statret = -1;
if (statret == -1)
errno = saveerrno;
+#if HAVE_LINK
+ else if (link_dest)
+ if (do_link(fnamecmpbuf, fname) != 0) {
+ if (verbose > 0)
+ rprintf(FINFO,"link %s => %s : %s\n",
+ fnamecmpbuf,
+ fname,
+ strerror(errno));
+ fnamecmp = fnamecmpbuf;
+ }
+#endif
else
fnamecmp = fnamecmpbuf;
}
Index: options.c
===================================================================
RCS file: /cvsroot/rsync/options.c,v
retrieving revision 1.80
diff -u -r1.80 options.c
--- options.c 27 Feb 2002 22:49:57 -0000 1.80
+++ options.c 7 Mar 2002 20:56:03 -0000
@@ -106,6 +106,9 @@
int always_checksum = 0;
int list_only = 0;
+int compare_perms = 0;
+int link_dest = 0;
+
char *batch_prefix = NULL;
static int modify_window_set;
@@ -195,6 +198,7 @@
rprintf(F," --safe-links ignore links outside the destination
tree\n");
rprintf(F," -H, --hard-links preserve hard links\n");
rprintf(F," -p, --perms preserve permissions\n");
+ rprintf(F," --compare-perms update if permissions have changed\n");
rprintf(F," -o, --owner preserve owner (root only)\n");
rprintf(F," -g, --group preserve group\n");
rprintf(F," -D, --devices preserve devices (root only)\n");
@@ -224,6 +228,7 @@
rprintf(F," --modify-window=NUM Timestamp window (seconds) for file match
(default=%d)\n",modify_window);
rprintf(F," -T --temp-dir=DIR create temporary files in directory DIR\n");
rprintf(F," --compare-dest=DIR also compare destination files relative to
DIR\n");
+ rprintf(F," --link-dest=DIR create hardlinks to DIR for unchanged
+files\n");
rprintf(F," -P equivalent to --partial --progress\n");
rprintf(F," -z, --compress compress file data\n");
rprintf(F," --exclude=PATTERN exclude files matching PATTERN\n");
@@ -266,7 +271,8 @@
OPT_DELETE_AFTER, OPT_EXISTING, OPT_MAX_DELETE, OPT_BACKUP_DIR,
OPT_IGNORE_ERRORS, OPT_BWLIMIT, OPT_BLOCKING_IO,
OPT_NO_BLOCKING_IO, OPT_NO_WHOLE_FILE,
- OPT_MODIFY_WINDOW, OPT_READ_BATCH, OPT_WRITE_BATCH, OPT_IGNORE_EXISTING};
+ OPT_MODIFY_WINDOW, OPT_READ_BATCH, OPT_WRITE_BATCH, OPT_IGNORE_EXISTING,
+ OPT_COMPARE_PERMS, OPT_LINK_DEST};
static struct poptOption long_options[] = {
/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
@@ -302,6 +308,7 @@
{"no-whole-file", 0, POPT_ARG_NONE, 0,
OPT_NO_WHOLE_FILE},
{"copy-unsafe-links", 0, POPT_ARG_NONE, ©_unsafe_links},
{"perms", 'p', POPT_ARG_NONE, &preserve_perms},
+ {"compare-perms", 0, POPT_ARG_NONE, &compare_perms},
{"owner", 'o', POPT_ARG_NONE, &preserve_uid},
{"group", 'g', POPT_ARG_NONE, &preserve_gid},
{"devices", 'D', POPT_ARG_NONE, &preserve_devices},
@@ -320,6 +327,7 @@
{"timeout", 0, POPT_ARG_INT, &io_timeout},
{"temp-dir", 'T', POPT_ARG_STRING, &tmpdir},
{"compare-dest", 0, POPT_ARG_STRING, &compare_dest},
+ {"link-dest", 0, POPT_ARG_STRING, 0, OPT_LINK_DEST},
/* TODO: Should this take an optional int giving the compression level? */
{"compress", 'z', POPT_ARG_NONE, &do_compression},
{"daemon", 0, POPT_ARG_NONE, &am_daemon},
@@ -535,6 +543,19 @@
/* popt stores the filename in batch_prefix for us */
read_batch = 1;
break;
+ case OPT_LINK_DEST:
+#if HAVE_LINK
+ compare_dest = poptGetOptArg(pc);
+ link_dest = 1;
+ break;
+#else
+ snprintf(err_buf,sizeof(err_buf),
+ "hard links are not supported on this %s\n",
+ am_server ? "server" : "client");
+ rprintf(FERROR,"ERROR: hard links not supported on this
+platform\n");
+ return 0;
+#endif
+
default:
/* FIXME: If --daemon is specified, then errors for later
Index: rsync.1
===================================================================
RCS file: /cvsroot/rsync/rsync.1,v
retrieving revision 1.111
diff -u -r1.111 rsync.1
--- rsync.1 6 Feb 2002 21:21:19 -0000 1.111
+++ rsync.1 7 Mar 2002 20:56:04 -0000
@@ -261,6 +261,7 @@
--safe-links ignore links outside the destination tree
-H, --hard-links preserve hard links
-p, --perms preserve permissions
+ --compare-perms update if permissions have changed
-o, --owner preserve owner (root only)
-g, --group preserve group
-D, --devices preserve devices (root only)
@@ -290,6 +291,7 @@
--modify-window=NUM Timestamp window (seconds) for file match (default=0)
-T --temp-dir=DIR create temporary files in directory DIR
--compare-dest=DIR also compare destination files relative to DIR
+ --link-dest=DIR create hardlinks to DIR for unchanged files
-P equivalent to --partial --progress
-z, --compress compress file data
--exclude=PATTERN exclude files matching PATTERN
@@ -485,6 +487,12 @@
This option causes rsync to update the remote
permissions to be the same as the local permissions\&.
.IP
+.IP "\fB--compare-perms\fP"
+This option causes rsync to update
+the remote file when permissions have chaned even if the file is unmodified\&.
+This preserves the permissions of any files outside the destination directory
+that have been hardlinked into the destination\&.
+.IP
.IP "\fB-o, --owner\fP"
This option causes rsync to set the owner of the
destination file to be the same as the source file\&. On most systems,
@@ -616,6 +624,7 @@
option, but instead it adds all exclude patterns listed in the file
FILE to the exclude list\&. Blank lines in FILE and lines starting with
\';\' or \'#\' are ignored\&.
+If \fIFILE\fP is \fB-\fP the list will be read from standard input.
.IP
.IP "\fB--include=PATTERN\fP"
This option tells rsync to not exclude the
@@ -628,6 +637,7 @@
.IP "\fB--include-from=FILE\fP"
This specifies a list of include patterns
from a file\&.
+If \fIFILE\fP is \fB-\fP the list will be read from standard input.
.IP
.IP "\fB-C, --cvs-exclude\fP"
This is a useful shorthand for excluding a
@@ -688,6 +698,12 @@
--partial because partially transferred files will remain in the new
temporary destination until they have a chance to be completed\&. If DIR is
a relative path, it is relative to the destination directory\&.
+.IP
+.IP "\fB-z, --link-dest=\fP\fIDIR\fP"
+This option behaves like \fB--compare-dest\fP
+but also will create hard links from \fIDIR\fP
+to the destination directory
+for unchanged files\&.
.IP
.IP "\fB-z, --compress\fP"
With this option, rsync compresses any data from
