In addition to the default CentOS repositories, you may need to add
RPMForge (for fuse-python) and EPEL (for pyxattr and pylibacl).
+ On Cygwin, install python, make, rsync, and gcc4.
+
- Build the python module and symlinks:
make
Using bup
---------
+ - Initialize the default BUP_DIR:
+
+ bup init
+
- Try making a local backup as a tar file:
tar -cvf - /etc | bup split -n local-etc -vv
anything useful.
+Notes on Cygwin
+---------------
+
+ - There is no support for ACLs. If/when some entrprising person
+ fixes this, adjust t/compare-trees.
+
+ - In t/test.sh, two tests have been disabled. These tests check to
+ see that repeated saves produce identical trees and that an
+ intervening index doesn't change the SHA1. Apparently Cygwin has
+ some unusual behaviors with respect to access times (that probably
+ warrant further investigation). Possibly related:
+ http://cygwin.com/ml/cygwin/2007-06/msg00436.html
+
+
+Notes on OS X
+-------------
+
+ - There is no support for ACLs. If/when some entrprising person
+ fixes this, adjust t/compare-trees.
+
+
How it works
============
are specified to 'bup save', then no metadata will be written for
the root directory. That's obviously less than ideal.
+ - bup is overly optimistic about mmap. Right now bup just assumes
+ that it can mmap as large a block as it likes, and that mmap will
+ never fail. Yeah, right... If nothing else, this has failed on
+ 32-bit architectures (and 31-bit is even worse -- looking at you,
+ s390).
+
+ To fix this, we might just implement a FakeMmap[1] class that uses
+ normal file IO and handles all of the mmap methods[2] that bup
+ actually calls. Then we'd swap in one of those whenever mmap
+ fails.
+
+ This would also require implementing some of the methods needed to
+ support "[]" array access, probably at a minimum __getitem__,
+ __setitem__, and __setslice__ [3].
+
+ [1] http://comments.gmane.org/gmane.comp.sysutils.backup.bup/613
+ [2] http://docs.python.org/2/library/mmap.html
+ [3] http://docs.python.org/2/reference/datamodel.html#emulating-container-types
+
- 'bup index' is slower than it should be.
It's still rather fast: it can iterate through all the filenames on my
- bup needs better documentation.
- According to a recent article about git in Linux Weekly News
+ According to a recent article about bup in Linux Weekly News
(https://lwn.net/Articles/380983/), "it's a bit short on examples and
a user guide would be nice." Documentation is the sort of thing that
will never be great unless someone from outside contributes it (since