$ git clone -n https://src.fedoraproject.org/rpms/gi-docgen.git /var/lib/mock/f40-build-2696072-69552/root/chroot_tmpdir/scmroot/gi-docgen
Cloning into '/var/lib/mock/f40-build-2696072-69552/root/chroot_tmpdir/scmroot/gi-docgen'...
$ git fetch origin b3a6e020dcf70f0efb7b9cbc8d10c819c725fe7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gi-docgen
 * [new ref]         b3a6e020dcf70f0efb7b9cbc8d10c819c725fe7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3a6e02 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild