$ git clone -n https://src.fedoraproject.org/rpms/rust-headers-core.git /var/lib/mock/f39-build-1526408-36063/root/chroot_tmpdir/scmroot/rust-headers-core
Cloning into '/var/lib/mock/f39-build-1526408-36063/root/chroot_tmpdir/scmroot/rust-headers-core'...
$ git fetch origin 74067107cc8f35ff47f337865614c73aadf3ce5a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-headers-core
 * [new ref]         74067107cc8f35ff47f337865614c73aadf3ce5a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7406710 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild