$ git clone -n https://src.fedoraproject.org/rpms/rust-pin-project.git /var/lib/mock/f39-build-1494217-34542/root/chroot_tmpdir/scmroot/rust-pin-project
Cloning into '/var/lib/mock/f39-build-1494217-34542/root/chroot_tmpdir/scmroot/rust-pin-project'...
$ git fetch origin e489a98b9495b1ea88fef70c7b95706d2670902c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pin-project
 * [new ref]         e489a98b9495b1ea88fef70c7b95706d2670902c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e489a98 Update to version 1.1.3; Fixes RHBZ#2229448