$ git clone -n https://src.fedoraproject.org/rpms/rust-dtoa.git /var/lib/mock/f45-build-41396-782/root/chroot_tmpdir/scmroot/rust-dtoa
Cloning into '/var/lib/mock/f45-build-41396-782/root/chroot_tmpdir/scmroot/rust-dtoa'...
$ git fetch origin 42014933e61d88db781ee41cd2d1cfe0523f988e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dtoa
 * [new ref]         42014933e61d88db781ee41cd2d1cfe0523f988e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4201493 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild