all: known_hosts authorized_keys config
	@chmod -R og= .
.PHONY: all

known_hosts: $(wildcard known_hosts.d/*)
	touch $@
	for f in $^; do \
	  echo "### from $$f:"; \
	  cat $$f; \
	  echo; \
	done > $@

authorized_keys: $(wildcard authorized_keys.d/*)
	touch $@
	for f in $^; do \
	  echo "### from $$f:"; \
	  cat $$f; \
	  echo; \
	done > $@

ifeq ($(strip $(wildcard config.local)),)
LOCAL_CONFIG=/dev/null
else
LOCAL_CONFIG=config.local
endif

SSH_VERSION = $(shell ssh -V 2>&1)
config: $(LOCAL_CONFIG) config.in
	cat $^ > $@
	case "$(SSH_VERSION)" in \
	  (OpenSSH_7.[12]*) \
	            sed -ri -e 's,ProxyJump ([-.[:alnum:]]+),ProxyCommand ssh \1 nc -q0 %h %p,' $@ \
	    ;; \
	  (OpenSSH_6.*) \
	    sed -ri -e 's,^.+\bCanonical.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bIgnoreUnknown\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bUpdateHostKeys\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^Match host ,Host ,' \
	            $@; \
	            sed -ri -e 's,ProxyJump ([-.[:alnum:]]+),ProxyCommand ssh \1 nc -q0 %h %p,' $@ \
	    ;; \
	  (OpenSSH_5.*) \
	    sed -ri -e 's,^.+\bControlPersist\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bIPQoS\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bCanonical.+$$,##UNSUPPORTED##&,' \
	            $@ \
	    ;; \
	  (OpenSSH_4.7*) \
	    sed -ri -e 's,^.+\bVisualHostKey\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bControlPersist\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bIPQoS\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bCanonical.+$$,##UNSUPPORTED##&,' \
	            $@ \
	    ;; \
	  (OpenSSH_4.3*) \
	    sed -ri -e 's,^.+\bExitOnForwardFailure\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bMACs\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^(.+ControlPath ~/.var/ssh/ssh_control_)%l_(.+),\1\2,' \
	            -e 's,^.+\bVisualHostKey\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bControlPersist\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bIPQoS\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bCanonical.+$$,##UNSUPPORTED##&,' \
	            $@ \
	    ;; \
	  (3.9*) \
	    sed -ri -e 's,^.+\bExitOnForwardFailure\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bMACs\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bHashKnownHosts\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bControl(Master|Path|Persist)\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bIPQoS\b.+$$,##UNSUPPORTED##&,' \
	            -e 's,^.+\bCanonical.+$$,##UNSUPPORTED##&,' \
	            $@ \
	    ;; \
	esac; \
	case "$$HOSTNAME" in \
	  (fishbowl) \
	    sed -i -re '/^Host fishbowl/,/^[[:space:]]*ProxyCommand/s/ProxyCommand.*/Host localhost/' $@; \
	esac