$ git clone -n https://src.fedoraproject.org/rpms/rust-grep.git /var/lib/mock/f40-build-2072696-49334/root/chroot_tmpdir/scmroot/rust-grep
Cloning into '/var/lib/mock/f40-build-2072696-49334/root/chroot_tmpdir/scmroot/rust-grep'...
$ git fetch origin 78735819e3b4e5920060a762666810d918ec21a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-grep
 * [new ref]         78735819e3b4e5920060a762666810d918ec21a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7873581 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild