$ git clone -n https://src.fedoraproject.org/rpms/ffmpegthumbs.git /var/lib/mock/f39-build-1703501-41216/root/chroot_tmpdir/scmroot/ffmpegthumbs
Cloning into '/var/lib/mock/f39-build-1703501-41216/root/chroot_tmpdir/scmroot/ffmpegthumbs'...
$ git fetch origin 1e9df3581c5c1b878d9d4af3ac443fa6c5d6f838:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ffmpegthumbs
 * [new ref]         1e9df3581c5c1b878d9d4af3ac443fa6c5d6f838 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e9df35 23.08.3