$ git clone -n https://src.fedoraproject.org/rpms/botan2.git /var/lib/mock/f39-build-1534154-36232/root/chroot_tmpdir/scmroot/botan2
Cloning into '/var/lib/mock/f39-build-1534154-36232/root/chroot_tmpdir/scmroot/botan2'...
$ git fetch origin 0c8c3566170996da92b6dda16f8cefa712b5d209:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/botan2
 * [new ref]         0c8c3566170996da92b6dda16f8cefa712b5d209 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c8c356 Fix FTI/FTBFS (#2219948, #2225727)