$ git clone -n https://src.fedoraproject.org/rpms/rust-rust-embed-utils.git /var/lib/mock/f45-build-44523-814/root/chroot_tmpdir/scmroot/rust-rust-embed-utils
Cloning into '/var/lib/mock/f45-build-44523-814/root/chroot_tmpdir/scmroot/rust-rust-embed-utils'...
$ git fetch origin f031ced7dcba75a6c3795050074cb09a133b5397:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rust-embed-utils
 * [new ref]         f031ced7dcba75a6c3795050074cb09a133b5397 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f031ced Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild