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gitgit-push

Do src and dst of push will be the same?

We know if a push command uses a refspec which has + sign, it will overwrite dst completely (non-fast-forward update) so dst and src will be the same. But is that true if a fast-forward update occurs?

Solution

  • But is that true if a fast-forward update occurs?

    Yes, considering a fast-forward simply moves the remote head dst to src (because src only adds new commits)

    --r--r--r--o--o--o (src)
        |
   (origin/dst)

git push +src:dst

--r--r--r--o--o--o (src)
                 |
            (origin/dst)

    From git push:

    By having the optional leading +, you can tell Git to update the <dst> ref even if it is not allowed by default (e.g., it is not a fast-forward.)

    That means: if the push is a fast-forward one, the '+' has no effect.