$ git clone -n https://src.fedoraproject.org/rpms/rust-nom-supreme.git /var/lib/mock/f38-build-side-43-rust-devel-1412105-31438/root/chroot_tmpdir/scmroot/rust-nom-supreme
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1412105-31438/root/chroot_tmpdir/scmroot/rust-nom-supreme'...
$ git fetch origin f433a695f1a11ddfb2e787da2f6fce7475100051:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nom-supreme
 * [new ref]         f433a695f1a11ddfb2e787da2f6fce7475100051 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f433a69 Initial Fedora package