$ git clone -n https://src.fedoraproject.org/rpms/rust-choosier.git /var/lib/mock/f38-build-side-43-rust-devel-1410016-31410/root/chroot_tmpdir/scmroot/rust-choosier
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1410016-31410/root/chroot_tmpdir/scmroot/rust-choosier'...
$ git fetch origin d1b4a5858ade0289578a45cdf0d8ec2d893db410:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-choosier
 * [new ref]         d1b4a5858ade0289578a45cdf0d8ec2d893db410 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1b4a58 Rebuild for fixed frame pointer compiler flags in Rust RPM macros