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added details about the URL backend

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Ilya_Shlyakhter 2018-10-12 20:28:25 +00:00 • committed by admin
parent 99731fd3d1
commit 209184a798
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doc/backends.mdwn
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@ -46,7 +46,12 @@ content of an annexed file remains unchanged.
files or slow systems. files or slow systems.
* `URL` -- This is a key that is generated from the url to a file. * `URL` -- This is a key that is generated from the url to a file.
It's generated when using eg, `git annex addurl --fast`, when the file It's generated when using eg, `git annex addurl --fast`, when the file
content is not available for hashing. content is not available for hashing. The key may not contain the full
URL; for long URLs, part of the URL may be represented by a checksum.
The URL key may contain `&` characters; be sure to quote the key if
passing it to a shell script. The URL-backend key is distinct from URLs/URIs
that may be attached to a key (from any backend) indicating the key's location
on the web or in one of [[special_remotes]].
If you want to be able to prove that you're working with the same file If you want to be able to prove that you're working with the same file
contents that were checked into a repository earlier, you should avoid contents that were checked into a repository earlier, you should avoid
@ -75,3 +80,5 @@ in `.gitattributes`:
* annex.backend=WORM * annex.backend=WORM
*.mp3 annex.backend=SHA256E *.mp3 annex.backend=SHA256E
*.ogg annex.backend=SHA256E *.ogg annex.backend=SHA256E
See also: [[git-annex-examinekey]]