$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-c.git /var/lib/mock/f45-build-43441-803/root/chroot_tmpdir/scmroot/rust-cargo-c
Cloning into '/var/lib/mock/f45-build-43441-803/root/chroot_tmpdir/scmroot/rust-cargo-c'...
$ git fetch origin 042c40d6b588f319b632cd429f827762183aaae8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-c
 * [new ref]         042c40d6b588f319b632cd429f827762183aaae8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 042c40d Update to version 0.10.24+cargo-0.98.0; Fixes RHBZ#2366918