Re: git log question

[Davis Herring <herring@lanl.gov>]

(All these commands have been given by others in this thread; this 
message aims to better relate them to the questions asked.)

> I find the following puzzling:
> 
> steve [ ~/git/emacs-master ]$ git log --oneline | grep b407c521f2
> b407c521f2 Remove pinentry.el
> 
> steve [ ~/git/emacs-26 ]$ git log --oneline | grep b407c521f2
> 
> The latter gives no output; yet:

This command of course answers your original question: "Is commit C on 
branch B?".  You could use "grep -q" to make it a test, but "git 
merge-base --is-ancestor C B" is more efficient.

> steve [ ~/git/emacs-26 ]$ git log --oneline b407c521f2 -1
> b407c521f2 Remove pinentry.el
> 
> That is, `git log' invoked with a specific commit will find that commit
> even when it's not on the current branch but on another branch in this
> repository,

"git log" == "git log HEAD"; "git log X" reports X itself and all 
commits in its history.

> but it appears unable to say which branch it's on.

This is a different, dual question: "Which branches contain commit C?", 
for which the command is "git branch [-r|-a] --contains C".

Davis

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