Initial commit with what I think we need

src/pg/Makefile

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+include ../../Makefile.global
+
+# Development tasks:
+#
+# * install generates the control & script files into src/pg/
+#   and installs then into the PostgreSQL extensions directory;
+#   requires sudo. In additionof the current development version
+#   named 'dev', an alias 'current' is generating for ease of
+#   update (upgrade to 'current', then to 'dev').
+# * test runs the tests for the currently generated Development
+#   extension.
+
+DATA         = $(EXTENSION)--dev.sql \
+	             $(EXTENSION)--current--dev.sql \
+	             $(EXTENSION)--dev--current.sql
+
+SOURCES_DATA_DIR = sql
+SOURCES_DATA = $(wildcard $(SOURCES_DATA_DIR)/*.sql)
+
+
+REPLACEMENTS = -e 's/@@VERSION@@/$(EXTVERSION)/g'
+
+$(DATA): $(SOURCES_DATA)
+	$(SED) $(REPLACEMENTS) $(SOURCES_DATA_DIR)/*.sql > $@
+
+TEST_DIR = test
+REGRESS = $(notdir $(basename $(wildcard $(TEST_DIR)/sql/*test.sql)))
+REGRESS_OPTS = --inputdir='$(TEST_DIR)' --outputdir='$(TEST_DIR)'
+
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+
+# This seems to be needed at least for PG 9.3.11
+all: $(DATA)
+
+test: export PGUSER=postgres
+test: installcheck
+
+# Release tasks
+
+../../release/$(EXTENSION).control: $(EXTENSION).control
+	cp $< $@
+
+# Prepare new release from the currently installed development version,
+# for the current version X.Y.Z (defined in the control file)
+# producing the extension script and control files in releases/
+release: ../../release/$(EXTENSION).control $(SOURCES_DATA)
+	$(SED) $(REPLACEMENTS) $(SOURCES_DATA_DIR)/*.sql > ../../release/$(EXTENSION)--$(EXTVERSION).sql
+
+# Install the current relese into the PostgreSQL extensions directory
+deploy:
+	$(INSTALL_DATA) ../../release/$(EXTENSION).control '$(DESTDIR)$(datadir)/extension/'
+	$(INSTALL_DATA) ../../release/*.sql '$(DESTDIR)$(datadir)/extension/'

src/pg/observatory.control

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+comment = 'CartoDB Observatory backend extension'
+default_version = '0.0.1'
+requires = 'postgis, cartodb'
+superuser = true
+schema = cdb_observatory

src/pg/sql/00_header.sql

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+--DO NOT MODIFY THIS FILE, IT IS GENERATED AUTOMATICALLY FROM SOURCES
+-- Complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION observatory" to load this file. \quit

src/pg/sql/10_version.sql

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+-- Version number of the extension release
+CREATE OR REPLACE FUNCTION cdb_observatory_version()
+RETURNS text AS $$
+  SELECT '@@VERSION@@'::text;
+$$ language 'sql' STABLE STRICT;
+
+-- Internal identifier of the installed extension instence
+-- e.g. 'dev' for current development version
+CREATE OR REPLACE FUNCTION _cdb_observatory_internal_version()
+RETURNS text AS $$
+  SELECT installed_version FROM pg_available_extensions where name='observatory' and pg_available_extensions IS NOT NULL;
+$$ language 'sql' STABLE STRICT;

src/pg/sql/90_permissions.sql

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+-- Placeholder for permission tweaks at creation time.
+-- Make sure by default there are no permissions for publicuser
+-- NOTE: this happens at extension creation time, as part of an implicit transaction.
+-- REVOKE ALL PRIVILEGES ON SCHEMA cdb_observatory FROM PUBLIC, publicuser CASCADE;
+
+-- Grant permissions on the schema to publicuser (but just the schema)
+-- GRANT USAGE ON SCHEMA cdb_crankshaft TO publicuser;
+
+-- Revoke execute permissions on all functions in the schema by default
+-- REVOKE EXECUTE ON ALL FUNCTIONS IN SCHEMA cdb_observatory FROM PUBLIC, publicuser;

src/pg/test/expected/01_install_test.out

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+-- Install dependencies
+CREATE EXTENSION postgis;
+CREATE EXTENSION cartodb;
+-- Install the extension
+CREATE EXTENSION observatory VERSION 'dev';

src/pg/test/sql/01_install_test.sql

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+-- Install dependencies
+CREATE EXTENSION postgis;
+CREATE EXTENSION cartodb;
+
+-- Install the extension
+CREATE EXTENSION observatory VERSION 'dev';