$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo.git /var/lib/mock/f40-build-2286343-55709/root/chroot_tmpdir/scmroot/rust-cargo
Cloning into '/var/lib/mock/f40-build-2286343-55709/root/chroot_tmpdir/scmroot/rust-cargo'...
$ git fetch origin b47abb2bcb8624ef0c63ac68f413e8e664e3c3fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo
 * [new ref]         b47abb2bcb8624ef0c63ac68f413e8e664e3c3fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b47abb2 Update to version 0.75.1; Fixes RHBZ#2250481