$ git clone -n https://src.fedoraproject.org/rpms/rust-rand_core0.5.git /var/lib/mock/f40-build-2682807-67965/root/chroot_tmpdir/scmroot/rust-rand_core0.5
Cloning into '/var/lib/mock/f40-build-2682807-67965/root/chroot_tmpdir/scmroot/rust-rand_core0.5'...
$ git fetch origin d421bd5eae3d8f1e02d0e872ce0b1c7194de7369:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rand_core0.5
 * [new ref]         d421bd5eae3d8f1e02d0e872ce0b1c7194de7369 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d421bd5 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild