$ git clone -n https://src.fedoraproject.org/rpms/rust-gsk4.git /var/lib/mock/f40-build-2713280-72126/root/chroot_tmpdir/scmroot/rust-gsk4
Cloning into '/var/lib/mock/f40-build-2713280-72126/root/chroot_tmpdir/scmroot/rust-gsk4'...
$ git fetch origin 2b7b3989c2e86603f5188dd9671fcc89b3ce9500:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gsk4
 * [new ref]         2b7b3989c2e86603f5188dd9671fcc89b3ce9500 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b7b398 Update to version 0.8.1; Fixes RHBZ#2262628