Passing ssh options to git clone

Question

I\'m trying to run git clone without ssh checking the repository host\'s key. I can do it from ssh like that:

ssh -o UserKnownHostsFile=/dev/nul         


        

Answer 1

Another option made to specify different keys is git config core.sshCommand with git 2.10 + (Q3 2016).

This is an alternative to the environment variable described in Boris's answer)

See commit 3c8ede3 (26 Jun 2016) by Nguyễn Thái Ngọc Duy (pclouds).
^{(Merged by Junio C Hamano -- gitster -- in commit dc21164, 19 Jul 2016)}

A new configuration variable core.sshCommand has been added to specify what value for GIT_SSH_COMMAND to use per repository.

Similar to $GIT_ASKPASS or $GIT_PROXY_COMMAND, we also read from config file first then fall back to $GIT_SSH_COMMAND.

This is useful for selecting different private keys targetting the same host (e.g. github)

core.sshCommand:

If this variable is set, git fetch and git push will use the specified command instead of ssh when they need to connect to a remote system.
The command is in the same form as the GIT_SSH_COMMAND environment variable and is overridden when the environment variable is set.

It means the git clone can be:

cd /path/to/my/repo
git config core.sshCommand 'ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no' 
# later on
git clone host:repo.git

If you want to apply that for all repos, as user1300959 adds in the comments, you would use a global configuration.

git config --global core.sshCommand 'ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no'