$ git clone -n https://src.fedoraproject.org/rpms/libyaml.git /var/lib/mock/f40-build-785749-134083/root/chroot_tmpdir/scmroot/libyaml
Cloning into '/var/lib/mock/f40-build-785749-134083/root/chroot_tmpdir/scmroot/libyaml'...
$ git fetch origin 64202a7ed39442eabbb54ce42c4d0dec14ebf72a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libyaml
 * [new ref]         64202a7ed39442eabbb54ce42c4d0dec14ebf72a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64202a7 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild