Git: Checking if a revision is among ancestors

Question

How do I check if a revision is among the ancestors of a commit. Is this done with rev-list?

TL;DR I am looking for the omition of a recently added line of code and a git bisect ends up suggesting very distant revision that doesn’t share ancestry and with the revision that add that partical line of code (but also is merged). So to qualify as a bad bisect the partical line of code must have once been added before.

Yup, I was uncertain of the particular wording so I changed it to parents. But am I suppose a three- or four-way merge commit has multiple parents. So ancestry is better. — Martin, Sep 05 '18 at 17:34
Looks like a duplicate of https://stackoverflow.com/q/3005392/24874 — Drew Noakes, Sep 05 '18 at 17:37

score 3 · Accepted Answer · answered Sep 05 '18 at 17:35

3

git merge-base --is-ancestor <ancestor> <descendant>

This command has an exit code of 0 if ancestor is an ancestor of descendant, otherwise returns 1.

answered Sep 05 '18 at 17:35

Drew Noakes

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So it wasn’t even rev-list. Thanks! – Martin Sep 05 '18 at 17:44
Would you know if it’s possible to bisect a straight line of ancestry? Looking at the documentation it doesn’t say anything about it. https://git-scm.com/docs/git-bisect – Martin Sep 05 '18 at 19:52
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I'm not sure what you mean by "straight line of ancestry". Could you explain? – Drew Noakes Sep 06 '18 at 07:28

Git: Checking if a revision is among ancestors

1 Answers1