$ git clone -n https://src.fedoraproject.org/rpms/rust-asyncgit.git /var/lib/mock/f41-build-side-1-3137342-39794/root/chroot_tmpdir/scmroot/rust-asyncgit
Cloning into '/var/lib/mock/f41-build-side-1-3137342-39794/root/chroot_tmpdir/scmroot/rust-asyncgit'...
$ git fetch origin da78eca5232f3c9210c6105847e9eccbc5879c2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-asyncgit
 * [new ref]         da78eca5232f3c9210c6105847e9eccbc5879c2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da78eca Bump git2 from 0.18 to 0.19 and git2-hooks from 0.3 to 0.4