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Merge commits in GIT

+1 vote
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I have a question about merge commits. Now when I perform git pull from somebody. Sometimes I'm getting a merge commit where I should write a merge commit message. Sometimes it does not happen, I just hit the git pull and it pulls the updates without creating a merge commit.

What is the difference? note that the files modified in the new commit -when getting a merge commit- are only maintained by a single user. And how can I avoid these merge commits as long as the file is maintained by one user ?

posted Jul 1, 2015 by anonymous

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1 Answer

0 votes

This happens depending on how the history of the repos has diverged. Basically when you make a pull you are doing a fetch and a merge in the background. So there are two types of merges, one of them ends with a commit merge the other dont.

Its better explained in https://git-scm.com/book/en/v2/Git-Branching-Basic-Branching-and-Merging

answer Jul 1, 2015 by Majula Joshi
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I often want to do this when rebasing, and have come to tagging the initial commit in my repos with INITIAL.

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In coreboot we try to check for whitespace errors before committing. Of course a pre-commit hook is the way to go, but unfortunately it is not so simple (at least for me) as the following requirements exist.

  1. Only the files actually committed should be checked. That means running git commit -a, abort that and then running git commit some/file should only check some/file for whitespace errors.

  2. There are certain files that are allowed to have whitespace errors. In our case these are *.patch and *.diff files which by design seem to contain whitespace error.

Currently the whole tree is checked, which takes a lot of time. I tried to come up with a patch, but failed so far. Best would be to have

$ git diff --check --only-committed-files --exclude "*patch$"

where I could not find a way for the last to switches.

Currently, I would use

$ git diff-index --cached --name-only $against -- | grep -v patch$

and pass that list to some whitespace check program. Unfortunately that still does not fulfill the first requirement. What am I missing to solve this elegantly?

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