85f9360d9b
Makes it allow writes, but not deletion of annexed content. Note that securing pushes to the git repository is left up to the user. This commit was sponsored by Jack Hill on Patreon.
190 lines
5.8 KiB
Markdown
190 lines
5.8 KiB
Markdown
# NAME
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git-annex-shell - Restricted login shell for git-annex only SSH access
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# SYNOPSIS
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git-annex-shell [-c] command [params ...]
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# DESCRIPTION
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git-annex-shell is a restricted shell, similar to git-shell, which
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can be used as a login shell for SSH accounts.
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Since its syntax is identical to git-shell's, it can be used as a drop-in
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replacement anywhere git-shell is used. For example it can be used as a
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user's restricted login shell.
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# COMMANDS
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Any command not listed below is passed through to git-shell.
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Note that the directory parameter should be an absolute path, otherwise
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it is assumed to be relative to the user's home directory. Also the
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first "/~/" or "/~user/" is expanded to the specified home directory.
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* configlist directory
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This outputs a subset of the git configuration, in the same form as
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`git config --list`. This is used to get the annex.uuid of the remote
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repository.
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When run in a repository that does not yet have an annex.uuid, one
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will be created, as long as a git-annex branch has already been pushed to
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the repository, or if the autoinit= flag is used to indicate
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initialization is desired.
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* inannex directory [key ...]
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This checks if all specified keys are present in the annex,
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and exits zero if so.
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Exits 1 if the key is certainly not present in the annex.
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Exits 100 if it's unable to tell (perhaps the key is in the process of
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being removed from the annex).
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* lockcontent directory key
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This locks a key's content in place in the annex, preventing it from
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being dropped.
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Once the content is successfully locked, outputs "OK". Then the content
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remains locked until a newline is received from the caller or the
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connection is broken.
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Exits nonzero if the content is not present, or could not be locked.
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* dropkey directory [key ...]
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This drops the annexed data for the specified keys.
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* recvkey directory key
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This runs rsync in server mode to receive the content of a key,
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and stores the content in the annex.
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* sendkey directory key
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This runs rsync in server mode to transfer out the content of a key.
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* transferinfo directory key
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This is typically run at the same time as sendkey is sending a key
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to the remote. Using it is optional, but is used to update
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progress information for the transfer of the key.
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It reads lines from standard input, each giving the number of bytes
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that have been received so far.
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* commit directory
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This commits any staged changes to the git-annex branch.
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It also runs the annex-content hook.
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* notifychanges directory
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This is used by `git-annex remotedaemon` to be notified when
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refs in the remote repository are changed.
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* gcryptsetup directory gcryptid
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Sets up a repository as a gcrypt repository.
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* p2pstdio directory uuid
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This causes git-annex-shell to communicate using the git-annex p2p
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protocol over stdio. When supported by git-annex-shell, this allows
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multiple actions to be run over a single connection, improving speed.
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The uuid is the one belonging to the repository that will be
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communicating with git-annex-shell.
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# OPTIONS
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Most options are the same as in git-annex. The ones specific
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to git-annex-shell are:
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* --uuid=UUID
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git-annex uses this to specify the UUID of the repository it was expecting
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git-annex-shell to access, as a sanity check.
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* -- fields=val fields=val.. --
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Additional fields may be specified this way, to retain compatibility with
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past versions of git-annex-shell (that ignore these, but would choke
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on new dashed options).
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Currently used fields include remoteuuid=, associatedfile=,
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unlocked=, direct=, and autoinit=
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# HOOK
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After content is received or dropped from the repository by git-annex-shell,
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it runs a hook, `.git/hooks/annex-content` (or `hooks/annex-content` on a bare
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repository). The hook is not currently passed any information about what
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changed.
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# ENVIRONMENT
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* GIT_ANNEX_SHELL_READONLY
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If set, disallows any action that could modify the git-annex
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repository.
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Note that this does not prevent passing commands on to git-shell.
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For that, you also need ...
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* GIT_ANNEX_SHELL_LIMITED
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If set, disallows running git-shell to handle unknown commands.
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* GIT_ANNEX_SHELL_APPENDONLY
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If set, allows data to be written to the git-annex repository,
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but does not allow data to be removed from it.
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Note that this does not prevent passing commands on to git-shell,
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so you will have to separately configure git to reject pushes that
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overwrite branches or are otherwise not appends. The git pre-receive
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hook may be useful for accomplishing this.
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It's a good idea to enable annex.securehashesonly in a repository
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that's set up this way.
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* GIT_ANNEX_SHELL_DIRECTORY
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If set, git-annex-shell will refuse to run commands that do not operate
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on the specified directory.
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# EXAMPLES
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To make a `~/.ssh/authorized_keys` file that only allows git-annex-shell
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to be run, and not other commands, pass the original command to the -c
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option:
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command="git-annex-shell -c \"$SSH_ORIGINAL_COMMAND\"",no-agent-forwarding,no-port-forwarding,no-X11-forwarding ssh-rsa AAAAB3NzaC1y[...] user@example.com
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To further restrict git-annex-shell to a particular repository,
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and fully lock it down to read-only mode:
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command="GIT_ANNEX_SHELL_DIRECTORY=/srv/annex GIT_ANNEX_SHELL_LIMITED=true GIT_ANNEX_SHELL_READONLY=true git-annex-shell -c \"$SSH_ORIGINAL_COMMAND\"",no-agent-forwarding,no-port-forwarding,no-X11-forwarding ssh-rsa AAAAB3NzaC1y[...] user@example.com
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Obviously, `ssh-rsa AAAAB3NzaC1y[...] user@example.com` needs to
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replaced with your SSH key. The above also assumes `git-annex-shell`
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is available in your `$PATH`, use an absolute path if it is not the
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case.
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# SEE ALSO
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[[git-annex]](1)
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git-shell(1)
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# AUTHOR
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Joey Hess <id@joeyh.name>
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<http://git-annex.branchable.com/>
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Warning: Automatically converted into a man page by mdwn2man. Edit with care
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