$ git clone -n https://src.fedoraproject.org/rpms/rust-gobject-sys.git /var/lib/mock/f42-build-side-1-3539512-46565/root/chroot_tmpdir/scmroot/rust-gobject-sys
Cloning into '/var/lib/mock/f42-build-side-1-3539512-46565/root/chroot_tmpdir/scmroot/rust-gobject-sys'...
$ git fetch origin 11d8f5de30a2bec573788f262214d2045150131e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gobject-sys
 * [new ref]         11d8f5de30a2bec573788f262214d2045150131e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11d8f5d Update to version 0.20.10; Fixes RHBZ#2365833