$ git clone -n https://src.fedoraproject.org/rpms/rust-coolor.git /var/lib/mock/f42-build-side-1-3588900-46951/root/chroot_tmpdir/scmroot/rust-coolor
Cloning into '/var/lib/mock/f42-build-side-1-3588900-46951/root/chroot_tmpdir/scmroot/rust-coolor'...
$ git fetch origin 234be8689d1b5f5ad678ac6082d0eafe72fc72b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-coolor
 * [new ref]         234be8689d1b5f5ad678ac6082d0eafe72fc72b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 234be86 Update to version 1.1.0; Fixes RHBZ#2365356