$ git clone -n https://src.fedoraproject.org/rpms/fedmsg.git /var/lib/mock/f40-build-1996229-43994/root/chroot_tmpdir/scmroot/fedmsg
Cloning into '/var/lib/mock/f40-build-1996229-43994/root/chroot_tmpdir/scmroot/fedmsg'...
$ git fetch origin 29b81c200ce9f61c99d41f7781f49fb767ebee7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fedmsg
 * [new ref]         29b81c200ce9f61c99d41f7781f49fb767ebee7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29b81c2 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild