$ git clone -n https://src.fedoraproject.org/rpms/rust-toml_datetime.git /var/lib/mock/f38-build-side-43-rust-devel-1416780-31457/root/chroot_tmpdir/scmroot/rust-toml_datetime
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1416780-31457/root/chroot_tmpdir/scmroot/rust-toml_datetime'...
$ git fetch origin b7d7b21f317af80897f9afc993379511518fa1f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-toml_datetime
 * [new ref]         b7d7b21f317af80897f9afc993379511518fa1f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7d7b21 Update to version 0.6.3; Fixes RHBZ#2217116