$ git clone -n https://src.fedoraproject.org/rpms/rust-av1-grain.git /var/lib/mock/f40-build-2182837-51244/root/chroot_tmpdir/scmroot/rust-av1-grain
Cloning into '/var/lib/mock/f40-build-2182837-51244/root/chroot_tmpdir/scmroot/rust-av1-grain'...
$ git fetch origin 49453894e0e64098fcc3a909006f511a6d61d4fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-av1-grain
 * [new ref]         49453894e0e64098fcc3a909006f511a6d61d4fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4945389 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild