$ git clone -n https://src.fedoraproject.org/rpms/rust-scroll_derive0.12.git /var/lib/mock/f45-build-44711-816/root/chroot_tmpdir/scmroot/rust-scroll_derive0.12
Cloning into '/var/lib/mock/f45-build-44711-816/root/chroot_tmpdir/scmroot/rust-scroll_derive0.12'...
$ git fetch origin 753c2c1d65f194f62ce41b2f76555444962b8d1f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scroll_derive0.12
 * [new ref]         753c2c1d65f194f62ce41b2f76555444962b8d1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 753c2c1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild