$ git clone -n https://src.fedoraproject.org/rpms/rust-glib.git /var/lib/mock/f40-build-2652354-66893/root/chroot_tmpdir/scmroot/rust-glib
Cloning into '/var/lib/mock/f40-build-2652354-66893/root/chroot_tmpdir/scmroot/rust-glib'...
$ git fetch origin 495de53c559be3cddf2b11c73774b37e49808ecb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib
 * [new ref]         495de53c559be3cddf2b11c73774b37e49808ecb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 495de53 Update to version 0.18.5; Fixes RHBZ#2247775