$ git clone -n https://src.fedoraproject.org/rpms/rust-diskonaut.git /var/lib/mock/f41-build-side-1-3124874-39482/root/chroot_tmpdir/scmroot/rust-diskonaut
Cloning into '/var/lib/mock/f41-build-side-1-3124874-39482/root/chroot_tmpdir/scmroot/rust-diskonaut'...
$ git fetch origin b125f1ea67d3f5d0415a42f191d89437cfeeda79:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-diskonaut
 * [new ref]         b125f1ea67d3f5d0415a42f191d89437cfeeda79 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b125f1e Port to versions of dependencies from this decade