$ git clone -n https://src.fedoraproject.org/rpms/rust-rctree.git /var/lib/mock/f39-build-1467936-33747/root/chroot_tmpdir/scmroot/rust-rctree
Cloning into '/var/lib/mock/f39-build-1467936-33747/root/chroot_tmpdir/scmroot/rust-rctree'...
$ git fetch origin 148dab4c4dd4fc97ffc94d405b18bd2eed2e53f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rctree
 * [new ref]         148dab4c4dd4fc97ffc94d405b18bd2eed2e53f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 148dab4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild