$ git clone -n https://src.fedoraproject.org/rpms/rust-webpki-roots.git /var/lib/mock/f38-build-side-43-rust-devel-1417253-31459/root/chroot_tmpdir/scmroot/rust-webpki-roots
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417253-31459/root/chroot_tmpdir/scmroot/rust-webpki-roots'...
$ git fetch origin ad99bb87e1085379fbd6d1002941e607927ae4e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-webpki-roots
 * [new ref]         ad99bb87e1085379fbd6d1002941e607927ae4e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad99bb8 Update to version 0.23.1; Fixes RHBZ#2183557