I want to check what branches contains this github commit.
So i performed following terminal spells on one of my boxes running git version
git clone firstname.lastname@example.org:npm/npm.git && cd npm
git branch -a --contains 5ff786ae103161465d84ecdfdc5b0cfd8839eac8
error: no such commit 5ff786ae103161465d84ecdfdc5b0cfd8839eac8
How this can happen if github shows this commit?
As we figured out this is due to the fact that github shows you in a weired way an orphaned commit. Actually they performed some history rewriting and the commit got kicked out of the official history. But it is still reachable, if you perform a
$ git log --all -grep="Sort actions by dependency order"
you still find the correct commit.