$ git clone -n https://src.fedoraproject.org/rpms/rust-mutate_once.git /var/lib/mock/f40-build-2681962-67963/root/chroot_tmpdir/scmroot/rust-mutate_once
Cloning into '/var/lib/mock/f40-build-2681962-67963/root/chroot_tmpdir/scmroot/rust-mutate_once'...
$ git fetch origin 0d78f8d8f4b7190a2782df62622ff6efde5be143:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mutate_once
 * [new ref]         0d78f8d8f4b7190a2782df62622ff6efde5be143 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d78f8d Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild