$ git clone -n https://src.fedoraproject.org/rpms/golang-github-emersion-message.git /var/lib/mock/f40-build-2000262-44444/root/chroot_tmpdir/scmroot/golang-github-emersion-message
Cloning into '/var/lib/mock/f40-build-2000262-44444/root/chroot_tmpdir/scmroot/golang-github-emersion-message'...
$ git fetch origin 5117d6d8041d7a6b765329e041fbafb7f8bd8299:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-emersion-message
 * [new ref]         5117d6d8041d7a6b765329e041fbafb7f8bd8299 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5117d6d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild