$ git clone -n https://src.fedoraproject.org/rpms/postfix-mta-sts-resolver.git /var/lib/mock/f39-build-1466300-33659/root/chroot_tmpdir/scmroot/postfix-mta-sts-resolver
Cloning into '/var/lib/mock/f39-build-1466300-33659/root/chroot_tmpdir/scmroot/postfix-mta-sts-resolver'...
$ git fetch origin 00f2fe566be58a4b17089fb393b4642260b993e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/postfix-mta-sts-resolver
 * [new ref]         00f2fe566be58a4b17089fb393b4642260b993e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00f2fe5 GPG Verify Downloaded Code