$ git clone -n https://src.fedoraproject.org/rpms/rust-sha1_smol.git /var/lib/mock/f45-build-44900-819/root/chroot_tmpdir/scmroot/rust-sha1_smol
Cloning into '/var/lib/mock/f45-build-44900-819/root/chroot_tmpdir/scmroot/rust-sha1_smol'...
$ git fetch origin 2eddf45892e01fb305a8e114e083e2cbbc31df22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha1_smol
 * [new ref]         2eddf45892e01fb305a8e114e083e2cbbc31df22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2eddf45 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild