$ git clone -n https://src.fedoraproject.org/rpms/golang-github-emersion-mbox.git /var/lib/mock/f40-build-2000259-44443/root/chroot_tmpdir/scmroot/golang-github-emersion-mbox
Cloning into '/var/lib/mock/f40-build-2000259-44443/root/chroot_tmpdir/scmroot/golang-github-emersion-mbox'...
$ git fetch origin 8d3eca4c74fa30d383fd96393d03b4e821bea846:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-emersion-mbox
 * [new ref]         8d3eca4c74fa30d383fd96393d03b4e821bea846 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8d3eca4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild