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phorge-phorge/scripts/ssh
epriestley c70f4815a9 Allow cluster devices to SSH to one another without acting as a user
Summary:
Ref T4292. When you run `git fetch` and connect to, say, `repo001.west.company.com`, we'll look at the current version of the repository in other nodes in the cluster.

If `repo002.east.company.com` has a newer version of the repository, we'll fetch that version first, then respond to your request.

To do this, we need to run `git fetch repo002.east.company.com ...` and have that connect to the other host and be able to fetch data.

This change allows us to run `PHABRICATOR_AS_DEVICE=1 git fetch ...` to use device credentials to do this fetch. (Device credentials are already supported and used, they just always connect as a user right now, but these fetches should be doable without having a user. We will have a valid user when you run `git fetch` yourself, but we won't have one if the daemons notice that a repository is out of date and want to update it, so the update code should not depend on having a user.)

Test Plan:
```
$ PHABRICATOR_AS_DEVICE=1 ./bin/ssh-connect local.phacility.com
Warning: Permanently added 'local.phacility.com' (RSA) to the list of known hosts.
PTY allocation request failed on channel 0
phabricator-ssh-exec: Welcome to Phabricator.

You are logged in as device/daemon.phacility.net.

You haven't specified a command to run. This means you're requesting an interactive shell, but Phabricator does not provide an interactive shell over SSH.

Usually, you should run a command like `git clone` or `hg push` rather than connecting directly with SSH.

Supported commands are: conduit, git-lfs-authenticate, git-receive-pack, git-upload-pack, hg, svnserve.
Connection to local.phacility.com closed.
```

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T4292

Differential Revision: https://secure.phabricator.com/D15755
2016-04-19 13:04:41 -07:00
..
ssh-auth-key.php Add a query/policy layer on top of SSH keys for Almanac 2014-11-06 12:37:02 -08:00
ssh-auth.php Proxy VCS SSH requests 2015-01-28 14:41:24 -08:00
ssh-connect.php Allow cluster devices to SSH to one another without acting as a user 2016-04-19 13:04:41 -07:00
ssh-exec.php Allow cluster devices to SSH to one another without acting as a user 2016-04-19 13:04:41 -07:00