$ git clone -n https://src.fedoraproject.org/rpms/rust-document-features.git /var/lib/mock/f38-build-side-42-init-devel-1406894-31263/root/chroot_tmpdir/scmroot/rust-document-features
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1406894-31263/root/chroot_tmpdir/scmroot/rust-document-features'...
$ git fetch origin 23ce3e99c5aa3dd06d1599b963d53f3f21ed00b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-document-features
 * [new ref]         23ce3e99c5aa3dd06d1599b963d53f3f21ed00b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23ce3e9 Initial import (#2238171)