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git-annex-cat

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Ilya_Shlyakhter 2019-11-27 18:16:35 +00:00 • committed by admin
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It would be useful to have a [[`git-annex-cat`|forum/Is_there_a___34__git_annex_cat-file__34___type_command__63__/]] command that outputs the contents of an annexed file without storing it in the annex. This [[can be faster|OPT: "bundle" get + check (of checksum) in a single operation]] than `git-annex-get` followed by `cat`, even if file is already present. It avoids some failure modes of `git-annex-get` (like running out of local space, or contending for locks). It supports a common use case of just needing a file for some operation, without needing to remember to drop it later. It could be used to implement a web server or FUSE filesystem that serves git-annex repo files on demand.
If file is not present, or `remote.here.cost` is higher than `remote.someremote.cost` where file is present, `someremote` would get a `TRANSFER` request where the `FILE` argument is a named pipe, and a `cat` of that named pipe would be started.
If file is not annexed, for uniformity `git-annex-cat file` would just call `cat file`.