$ git clone -n https://src.fedoraproject.org/rpms/glib2.git /var/lib/mock/f38-build-side-42-init-devel-620107-26336/root/chroot_tmpdir/scmroot/glib2
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-620107-26336/root/chroot_tmpdir/scmroot/glib2'...
$ git fetch origin 206bc35a0639ae595749d53baa4e5b9613f95109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glib2
 * [new ref]         206bc35a0639ae595749d53baa4e5b9613f95109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 206bc35 Update to 2.76.2