$ git clone -n https://src.fedoraproject.org/rpms/rust-linux_proc.git /var/lib/mock/f45-build-43037-799/root/chroot_tmpdir/scmroot/rust-linux_proc
Cloning into '/var/lib/mock/f45-build-43037-799/root/chroot_tmpdir/scmroot/rust-linux_proc'...
$ git fetch origin a2685b0a596d6fb868274d8d966c9f72e31981da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-linux_proc
 * [new ref]         a2685b0a596d6fb868274d8d966c9f72e31981da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a2685b0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild