$ git clone -n https://src.fedoraproject.org/rpms/rust-apple-flat-package.git /var/lib/mock/f41-build-side-1-3137248-39791/root/chroot_tmpdir/scmroot/rust-apple-flat-package
Cloning into '/var/lib/mock/f41-build-side-1-3137248-39791/root/chroot_tmpdir/scmroot/rust-apple-flat-package'...
$ git fetch origin 47435d9ef8bf3ff9ee56e5b2a2ecf599b3822331:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-apple-flat-package
 * [new ref]         47435d9ef8bf3ff9ee56e5b2a2ecf599b3822331 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47435d9 Initial import; Fixes: RHBZ#2312473