I just tagged v9 of the python btrfs library.
https://github.com/knorrie/python-btrfs
Q: What is python-btrfs?
A: python-btrfs is a python3 implementation of the data structures for
btrfs metadata, and an implementation of the kernel API (via ioctl
calls) that btrfs provides to userland.
Q: Ok, whatever, dude, but what would I need that for?
A: You probably won't need this.
Q: I'm a btrfs developer, what is this?
A: It provides quick hackable ways to inspect a running filesystem. You
can look up things in the current kernel metadata memory, play around
with ioctls, and quickly cobble up scripts for that.
Here's the summary of changes:
python-btrfs v9, Nov 23 2017
* IOCTLs: IOC_SET_RECEIVED_SUBVOL, IOC_LOGICAL_INO_V2
* Add crc32c checksum function for data, thanks Nikolay Borisov
* Recognize zstd compression type
* Add a tree object pretty printer to dump data for any tree item
* Examples added:
- Show default subvolume id
- Lookup a block checksum in the checksum tree
- Determine bad free space fragmentation score for block groups
- Set the received_uuid e.a. of a subvolume
- Dump an entire metadata tree using the pretty printer
* Fixes:
- crc32c: add implicit seed truncation to 32 bits value
* Small fixes and cosmetic changes
Note: the IOC_SET_RECEIVED_SUBVOL is added 'because we can'. It's not
added because it's a very good to mess around with it except for
educational purpose in a test environment.
As usual, detailed explanations of all changes are in the git commit
messages.
Feedback from Nikolay Borisov pushed me to have a look at how the
checksum storage is done.
My favorite one for this release is the tree object pretty printer,
which allows us to dump a single tree object displaying all its
attributes, but also allows us to stream a search query into it to
output a full dump of a metadata tree. See the examples/dump_tree.py
about this!
Tomorrow I'll update pypi and will prepare debian packages for unstable
and stretch-backports.
--
Have fun,
Hans van Kranenburg
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