$ git clone -n https://src.fedoraproject.org/rpms/gnome-builder.git /var/lib/mock/f40-build-2251801-54150/root/chroot_tmpdir/scmroot/gnome-builder
Cloning into '/var/lib/mock/f40-build-2251801-54150/root/chroot_tmpdir/scmroot/gnome-builder'...
$ git fetch origin 462a7263529042976e57224e35fd972f07e1f71f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-builder
 * [new ref]         462a7263529042976e57224e35fd972f07e1f71f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 462a726 Fix building against libxml2 2.12.0