git-annex/doc/walkthrough/moving_file_content_between_repositories.mdwn
Joey Hess ef3457196a use SHA256 by default
To get old behavior, add a .gitattributes containing: * annex.backend=WORM

I feel that SHA256 is a better default for most people, as long as their
systems are fast enough that checksumming their files isn't a problem.
git-annex should default to preserving the integrity of data as well as git
does. Checksum backends also work better with editing files via
unlock/lock.

I considered just using SHA1, but since that hash is believed to be somewhat
near to being broken, and git-annex deals with large files which would be a
perfect exploit medium, I decided to go to a SHA-2 hash.

SHA512 is annoyingly long when displayed, and git-annex displays it in a
few places (and notably it is shown in ls -l), so I picked the shorter
hash. Considered SHA224 as it's even shorter, but feel it's a bit weird.

I expect git-annex will use SHA-3 at some point in the future, but
probably not soon!

Note that systems without a sha256sum (or sha256) program will fall back to
defaulting to SHA1.
2011-11-04 15:51:01 -04:00

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Markdown

Often you will want to move some file contents from a repository to some
other one. For example, your laptop's disk is getting full; time to move
some files to an external disk before moving another file from a file
server to your laptop. Doing that by hand (by using `git annex get` and
`git annex drop`) is possible, but a bit of a pain. `git annex move`
makes it very easy.
# git annex move my_cool_big_file --to usbdrive
move my_cool_big_file (to usbdrive...) ok
# git annex move video/hackity_hack_and_kaxxt.mov --from fileserver
move video/hackity_hack_and_kaxxt.mov (from fileserver...)
SHA256-s86050597--6ae2688bc533437766a48aa19f2c06be14d1bab9c70b468af445d4f07b65f41e 100% 82MB 199.1KB/s 07:02
ok