$ git clone -n https://src.fedoraproject.org/rpms/glib2.git /var/lib/mock/f41-build-855532-167162/root/chroot_tmpdir/scmroot/glib2
Cloning into '/var/lib/mock/f41-build-855532-167162/root/chroot_tmpdir/scmroot/glib2'...
$ git fetch origin 250e52c5ef99c80c95587516b7e99693b3bb2a1a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glib2
 * [new ref]         250e52c5ef99c80c95587516b7e99693b3bb2a1a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 250e52c Update to 2.82.1