fix error when both ref and depth specified

[AliAllomani]

Related to Issue #225

• g.clone doesn't define which branch to clone, so when depth is specified it's only clone master branch
• after that it tries to checkout to the branch with g.checkout(dst, ref)
• since the defined branch hasn't been cloned, it fail with the error message "error: pathspec 'XXX' did not match any file(s) known to git"

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[sebglon]

Hi,
How we can help to fix/merge this PR?
We have the same bug with a very big repository and we want to use the depth.

Regards

[sebglon]

We can probably use git clone --no-checkout --depth 1 to import the git index
And after that use the git checkout already defined on the update func.

It seems better

[SergeyMuha]

Waiting for the fix

[zachwhaley]

Duplicate #266

Feel free to use code from mine if you want.

[william-salt-cko]

@azr sorry to @ you. I think you are one of the main contributors/maintainers of the package, could you perhaps chime in on this, or the associated PRs?