$ git clone -n https://src.fedoraproject.org/rpms/rust-str_stack.git /var/lib/mock/f45-build-45199-821/root/chroot_tmpdir/scmroot/rust-str_stack
Cloning into '/var/lib/mock/f45-build-45199-821/root/chroot_tmpdir/scmroot/rust-str_stack'...
$ git fetch origin 01c4bff9b9267fac6b07ae0643ee3762b3065108:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-str_stack
 * [new ref]         01c4bff9b9267fac6b07ae0643ee3762b3065108 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01c4bff Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild