The backup-bouncer tool looks very helpful.
I tried testing my own backup solution (see http://shoup.net/xattr )
with backup-bouncer.
It did fine -- it preserves everything on cross-platform backups,
except for those things
it was not designed to: ACLs (I don't know much about these) and BSD
flags other than uchg, uappnd
(I modified the backup-bouncer test suite to restrict to just these
BSD flags, to verify).
-- Victor Shoup
On Jan 18, 2008, at 11:12 PM, Moritz Heckscher wrote:
Am 2008-01-19 um 01:37 schrieb Moritz Heckscher:
3) To help with the checking/comparing, someone else built a
little tool. It not only creates a collection of test files but
can also compare the original and transferred versions afterwards:
<http://www.n8gray.org/blog/2007/04/27/introducing-backup-bouncer/>
I have downloaded the tool and compiled it on my Mac with 10.4 to
do some testing. In this case, that's transfers using rsync
3.0.0pre8 from one HFS+ disk image to another HFS+ image (on a
computer with an HFS+ disk as well). Later I'd be using cross-
platform cross-filesystem transfers, so the results below should
present something like the "upper limit" of what is currently
possible.
Using the following options for rsync:
--archive --hard-links --acls --xattrs --executability --numeric-ids
I get the following output from backup-bouncer:
------------------ rsync3.0.0pre8 ------------------
This copier exited with error code 23
This copier produced log output in:
/Volumes/Dst/21-rsync3.0.0pre8/log
Verifying: basic-permissions ... ok
Verifying: timestamps ...
Sub-test: modification time ... ok
ok
Verifying: symlinks ... ok
Verifying: symlink-ownership ... ok
Verifying: hardlinks ... ok
Verifying: resource-forks ... ok
Verifying: finder-flags ... ok
Verifying: finder-locks ... FAIL
Verifying: creation-date ... FAIL
Verifying: bsd-flags ... FAIL
Verifying: extended-attrs ...
Sub-test: on files ... ok
Sub-test: on directories ... ok
Sub-test: on symlinks ... ok
ok
Verifying: access-control-lists ...
Sub-test: on files ... ok
Sub-test: on dirs ... ok
ok
Verifying: fifo ... FAIL
Verifying: devices ... FAIL
Verifying: combo-tests ...
Sub-test: xattrs + rsrc forks ... ok
Sub-test: lots of metadata ... ok
ok
So that looks not so bad actually. The main problem for me are the
mangled creation dates. However, not even Apple's own cp with
options -pR (-p to "preserve in the copy as many of the
modification time, access time, file flags, file mode, user ID, and
group ID as allowed by permissions") passes this test:
------------------ cp-apple ------------------
Verifying: basic-permissions ... ok
Verifying: timestamps ...
Sub-test: modification time ... ok
ok
Verifying: symlinks ... ok
Verifying: symlink-ownership ... FAIL
Verifying: hardlinks ... FAIL
Verifying: resource-forks ... ok
Verifying: finder-flags ... ok
Verifying: finder-locks ... ok
Verifying: creation-date ... FAIL
Verifying: bsd-flags ... ok
Verifying: extended-attrs ...
Sub-test: on files ... ok
Sub-test: on directories ... ok
Sub-test: on symlinks ... FAIL
FAIL
Verifying: access-control-lists ...
Sub-test: on files ... ok
Sub-test: on dirs ... ok
ok
Verifying: fifo ... ok
Verifying: devices ... ok
Verifying: combo-tests ...
Sub-test: xattrs + rsrc forks ... ok
Sub-test: lots of metadata ... ok
ok
For comparison, this is Apple's 'fixed' rsync version 2.6.3
protocol version 28:
------------------ rsync-apple ------------------
This copier exited with error code 24
This copier produced log output in:
/Volumes/Dst/10-rsync-apple/log
Verifying: basic-permissions ... ok
Verifying: timestamps ...
Sub-test: modification time ... ok
ok
Verifying: symlinks ... ok
Verifying: symlink-ownership ... ok
Verifying: hardlinks ... ok
Verifying: resource-forks ... FAIL
Verifying: finder-flags ... FAIL
Verifying: finder-locks ... FAIL
Verifying: creation-date ... FAIL
Verifying: bsd-flags ... FAIL
Verifying: extended-attrs ...
Sub-test: on files ... FAIL
Sub-test: on directories ... FAIL
Sub-test: on symlinks ... FAIL
FAIL
Verifying: access-control-lists ...
Sub-test: on files ... FAIL
Sub-test: on dirs ... FAIL
FAIL
Verifying: fifo ... ok
Verifying: devices ... ok
Verifying: combo-tests ...
Sub-test: xattrs + rsrc forks ... FAIL
Sub-test: lots of metadata ... FAIL
FAIL
Adding --fake-super to the options of rsync doesn't help:
------------------ rsync3.0.0pre8 ------------------
This copier exited with error code 23
This copier produced log output in:
/Volumes/Dst/21-rsync3.0.0pre8/log
Verifying: basic-permissions ... FAIL
Verifying: timestamps ...
Sub-test: modification time ... ok
ok
Verifying: symlinks ... ok
Verifying: symlink-ownership ... FAIL
Verifying: hardlinks ... ok
Verifying: resource-forks ... ok
Verifying: finder-flags ... ok
Verifying: finder-locks ... FAIL
Verifying: creation-date ... FAIL
Verifying: bsd-flags ... FAIL
Verifying: extended-attrs ...
Sub-test: on files ... FAIL
Sub-test: on directories ... FAIL
Sub-test: on symlinks ... FAIL
FAIL
Verifying: access-control-lists ...
Sub-test: on files ... FAIL
Sub-test: on dirs ... FAIL
FAIL
Verifying: fifo ... FAIL
Verifying: devices ... FAIL
Verifying: combo-tests ...
Sub-test: xattrs + rsrc forks ... FAIL
cmp: ./many-metadata: Permission denied
Sub-test: lots of metadata ... FAIL
FAIL
-Moritz
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