$ git clone -n https://src.fedoraproject.org/rpms/rust-openpgp-cert-d.git /var/lib/mock/f39-build-1815028-41837/root/chroot_tmpdir/scmroot/rust-openpgp-cert-d
Cloning into '/var/lib/mock/f39-build-1815028-41837/root/chroot_tmpdir/scmroot/rust-openpgp-cert-d'...
$ git fetch origin f8158966f7a11ebb29d3139a0d34d2acc1e12f77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-openpgp-cert-d
 * [new ref]         f8158966f7a11ebb29d3139a0d34d2acc1e12f77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f815896 Update to version 0.1.2; Fixes RHBZ#2248420