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I was reading the question Tell git which private key to use, and the answer doesn't apply for a case were the user doesn't have any home directory.

We're setting up a Jenkins server right now, and the user who run Jenkins doesn't have any home folder. But that particular user must access a GIT repository.

How can the user running GIT use a key authentication?

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// , What if the machine doesn't even have the key in question? Can one specify which forwarded identity to use? – Nathan Basanese Sep 11 '15 at 19:37
up vote 11 down vote accepted

The environment variable GIT_SSH tells git what ssh exectutable to use. So you could create a script something like:

#!/bin/bash
/usr/bin/ssh -i /path/to/identity.file "$@"

Then chmod it executable, and set GIT_SSH=/path/to/sshscript

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