On Thu, Jul 19, 2018 at 2:02 PM Lars Schneider <larsxschnei...@gmail.com> wrote:
>
> Hi,
>
> I have a blob hash and I would like to know what commit referenced
> this blob first in a given Git repo.

git describe <blob>

If the given object refers to a blob, it will be described as
<commit-ish>:<path>,
such that the blob can be found at <path> in the <commit-ish>, which itself
describes the first commit in which this blob occurs in a reverse
revision walk from HEAD.

Since
644eb60bd01 (builtin/describe.c: describe a blob, 2017-11-15)
(included first in 2.16.0

You're welcome,
Stefan

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