$ git clone -n https://src.fedoraproject.org/rpms/apg.git /var/lib/mock/f39-build-1624997-39122/root/chroot_tmpdir/scmroot/apg
Cloning into '/var/lib/mock/f39-build-1624997-39122/root/chroot_tmpdir/scmroot/apg'...
$ git fetch origin c8609a39ae212d296b32e46f839b5e2ae3b4a22f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apg
 * [new ref]         c8609a39ae212d296b32e46f839b5e2ae3b4a22f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8609a3 Fix FTBFS