$ git clone -n https://src.fedoraproject.org/rpms/rust-whoami.git /var/lib/mock/f45-build-46246-832/root/chroot_tmpdir/scmroot/rust-whoami
Cloning into '/var/lib/mock/f45-build-46246-832/root/chroot_tmpdir/scmroot/rust-whoami'...
$ git fetch origin f24a9f43efddd477ba1659eeb4fe81d20d53c9c7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-whoami
 * [new ref]         f24a9f43efddd477ba1659eeb4fe81d20d53c9c7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f24a9f4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild