$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-insta.git /var/lib/mock/f40-build-1646779-24180/root/chroot_tmpdir/scmroot/rust-cargo-insta
Cloning into '/var/lib/mock/f40-build-1646779-24180/root/chroot_tmpdir/scmroot/rust-cargo-insta'...
$ git fetch origin d59614a184b82437a9f132838d13b62ffc14cd29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-insta
 * [new ref]         d59614a184b82437a9f132838d13b62ffc14cd29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d59614a Update to 1.39.0