$ git clone -n https://src.fedoraproject.org/rpms/rust-glib-build-tools.git /var/lib/mock/f38-build-side-43-rust-devel-1421771-31465/root/chroot_tmpdir/scmroot/rust-glib-build-tools
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1421771-31465/root/chroot_tmpdir/scmroot/rust-glib-build-tools'...
$ git fetch origin bd09a98746893c08adc471113f0b8eb8ba80fd43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib-build-tools
 * [new ref]         bd09a98746893c08adc471113f0b8eb8ba80fd43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd09a98 Initial import (#2223991)