$ git clone -n https://src.fedoraproject.org/rpms/rust-headers-core.git /var/lib/mock/f40-build-2660260-66918/root/chroot_tmpdir/scmroot/rust-headers-core
Cloning into '/var/lib/mock/f40-build-2660260-66918/root/chroot_tmpdir/scmroot/rust-headers-core'...
$ git fetch origin 3245ba48c4195e3b6ac063aaff2df64aea03ca49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-headers-core
 * [new ref]         3245ba48c4195e3b6ac063aaff2df64aea03ca49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3245ba4 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild