From: Wayne Davison <wayned@samba.org>
Date: Sun, 2 May 2004 16:24:36 +0000 (+0000)
Subject: Craig Barratt's --checksum-seed option.
X-Git-Url: https://mattmccutchen.net/rsync/rsync-patches.git/commitdiff_plain/648f0bac247e1709a6dbeaee1b1f2ab77e50b252

Craig Barratt's --checksum-seed option.
---

diff --git a/checksum-seed.diff b/checksum-seed.diff
new file mode 100644
index 0000000..6847c26
--- /dev/null
+++ b/checksum-seed.diff
@@ -0,0 +1,61 @@
+--- options.c	2004-04-17 10:07:23.000000000 -0700
++++ options.c	2004-05-01 16:24:44.380672000 -0700
+@@ -290,6 +290,7 @@
+   rprintf(F,"     --bwlimit=KBPS          limit I/O bandwidth, KBytes per second\n");
+   rprintf(F,"     --write-batch=PREFIX    write batch fileset starting with PREFIX\n");
+   rprintf(F,"     --read-batch=PREFIX     read batch fileset starting with PREFIX\n");
++  rprintf(F,"     --checksum-seed=NUM     set block/file checksum seed\n");
+   rprintf(F," -h, --help                  show this help screen\n");
+ #ifdef INET6
+   rprintf(F," -4                          prefer IPv4\n");
+@@ -386,6 +387,7 @@
+   {"from0",           '0', POPT_ARG_NONE,   &eol_nulls, 0, 0, 0},
+   {"no-implied-dirs",  0,  POPT_ARG_VAL,    &implied_dirs, 0, 0, 0 },
+   {"protocol",         0,  POPT_ARG_INT,    &protocol_version, 0, 0, 0 },
++  {"checksum-seed",    0,  POPT_ARG_INT,    &checksum_seed, 0, 0, 0 },
+ #ifdef INET6
+   {0,		      '4', POPT_ARG_VAL,    &default_af_hint, AF_INET, 0, 0 },
+   {0,		      '6', POPT_ARG_VAL,    &default_af_hint, AF_INET6, 0, 0 },
+@@ -911,6 +913,11 @@
+ 			goto oom;
+ 		args[ac++] = arg;
+ 	}
++	if (checksum_seed) {
++		if (asprintf(&arg, "--checksum_seed=%d", checksum_seed) < 0)
++			goto oom;
++		args[ac++] = arg;
++	}
+ 
+ 	if (keep_partial)
+ 		args[ac++] = "--partial";
+--- rsync.yo	2004-04-30 11:02:43.000000000 -0700
++++ rsync.yo	2004-05-01 16:59:48.546313600 -0700
+@@ -348,6 +348,7 @@
+      --bwlimit=KBPS          limit I/O bandwidth, KBytes per second
+      --write-batch=PREFIX    write batch fileset starting with PREFIX
+      --read-batch=PREFIX     read batch fileset starting with PREFIX
++     --checksum-seed=NUM     set block/file checksum seed
+  -h, --help                  show this help screen
+ 
+ 
+@@ -897,6 +898,20 @@
+ using the fileset whose filenames start with PREFIX. See the "BATCH
+ MODE" section for details.
+ 
++dit(bf(--checksum-seed=NUM)) Set the MD4 checksum seed to the integer
++NUM.  This 4 byte checksum seed is included in each block and file
++MD4 checksum calculation.  By default the checksum seed is generated
++by the server and defaults to the current time(), or 32761 if
++bf(--write-batch) or bf(--read-batch) are specified.  This option
++is used to set a specific checksum seed, which is useful for
++applications that want repeatable block and file checksums, or
++in the case where the user wants a more random checksum seed.
++Note that setting NUM to 0 causes rsync to use the default of time()
++for checksum seed.  Note also that --write-batch and --read-batch
++set the checksum seed to 32761, so --checksum-seed=NUM needs to
++follow these options if you want to specify a different checksum
++seed in batch mode.
++
+ enddit()
+ 
+ manpagesection(EXCLUDE PATTERNS)