David Brown <davidb@xxxxxxxxxxxxxx> writes: > On Fri, Jan 20, 2012 at 03:13:58PM +0100, Andreas Schwab wrote: >> Brian Foster <brian.foster@xxxxxxxxxxxx> writes: >> >> > In a script, how can I determine commit Y is reachable >> > from the current HEAD ? >> >> test $(git merge-base HEAD Y) = $(git rev-parse Y) > > Almost. It works as long as there is only one merge base. You really > need to check if $(git rev-parse Y) is one of $(git merge-base --all > HEAD Y) Can you give us an example of a topology to which "merge-base --all HEAD Y" gives more than one output and Y is still reachable from HEAD? It is my understanding that merge-base computation will give only Y and nothing else when Y is reachable from HEAD. I also think this assumption is used by some of the internal code in Git, and that is why I care. -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html