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Can I make Magit add my ssh passphrase to ssh-agent instead ask me to use the passphrase a single time?
Every time I push a commit to my remote I need to type my passphrase or instead run M-& ssh-add PATH_TO_MY_CREDENTIAL to add it to my ssh-agent.
You can use the ssh-agency package for this. It integrates with magit, and will run ssh-add as needed when you push. If you don't have ssh-askpass installed, you will need a version which includes this fix (pushed Apr 4, 2018) to successfully prompt for a passphrase on a Unixish system.
Note: I'm the author of this package.
(require 'ssh-agency). Then I did the test and the result was the same that I described in my question.
echo $SSH_AUTH_SOCK, echo $SSH_AUTH_PID, and ssh-add -l; echo $? in a terminal; (getenv "SSH_AUTH_SOCK"), and (ssh-agency-status) in Emacs?
echo $SSH_AUTH_PID : /tmp/ssh-OfgrvDM7CUHq/agent.1750 same result of (getenv "SSH_AUTH_SOCK"), now the echo $SSH_AUTH_PID returns nothing, ssh-add -l;echo $? returns "The agent has no identities." and "1", (ssh-agency-status) has returned no-keys. Before run this comands I tried to push commits im my remote twice and all the time it requested me my passphrase.
PATH_TO_MY_CREDENTIAL some non-standard path (i.e., not one of ~/.ssh/id_rsa, ~/.ssh/id_dsa, ~/.ssh/id_ecdsa, or ~/.ssh/id_ed25519)? If so, you need to customize ssh-agency-keys.
ssh-agency-keys is right! When I get the variable content, it shows ~/.ssh/id_rsa and ~/.ssh/id_rsa_gateway. And this is the current keys I have in this host.
ssh-agent?ssh-agentwas starting, but when I runssh-add CREDENTIALI don't need to type my password again.