David Kastrup <dak@xxxxxxx> writes:
> I disagree that --exit-code does nothing: it indicates whether the
> listed log is empty. So for example
>
> git log -1 --exit-code a..b > /dev/null
>
> can be used to figure out whether "a" is a proper ancestor of "b" or
> not.
Hmph.
$ git log --exit-code master..maint >/dev/null; echo $?
0
$ git log --exit-code maint..master >/dev/null; echo $?
1
That is a strange way to use --exit-code. I suspect that if you did
this, you will get 0 from the log between HEAD~..HEAD
$ git checkout master^0
$ git commit --allow-empty -m empty
$ git log --exit-code HEAD~..HEAD
even though HEAD~ is a proper ancestor of HEAD, so it is not giving
us anything useful. Isn't it a mere artifact that "log" happens to
share the underlying machinery with "diff" that --exit-code shows a
non-zero exit when there is any single commit in the range that has
any change?
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