$ git clone -n https://src.fedoraproject.org/rpms/rust-glib.git /var/lib/mock/f39-build-1538196-36390/root/chroot_tmpdir/scmroot/rust-glib
Cloning into '/var/lib/mock/f39-build-1538196-36390/root/chroot_tmpdir/scmroot/rust-glib'...
$ git fetch origin 0851db304cc56ddfe9e3e8350e8bbea35e7b1670:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib
 * [new ref]         0851db304cc56ddfe9e3e8350e8bbea35e7b1670 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0851db3 Update to version 0.18.2; Fixes RHBZ#2239031