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extension_control_path
The new GUC extension_control_path specifies a path to look for extension control files. The default value is $system, which looks in the compiled-in location, as before. The path search uses the same code and works in the same way as dynamic_library_path. Some use cases of this are: (1) testing extensions during package builds, (2) installing extensions outside security-restricted containers like Python.app (on macOS), (3) adding extensions to PostgreSQL running in a Kubernetes environment using operators such as CloudNativePG without having to rebuild the base image for each new extension. There is also a tweak in Makefile.global so that it is possible to install extensions using PGXS into an different directory than the default, using 'make install prefix=/else/where'. This previously only worked when specifying the subdirectories, like 'make install datadir=/else/where/share pkglibdir=/else/where/lib', for purely implementation reasons. (Of course, without the path feature, installing elsewhere was rarely useful.) Author: Peter Eisentraut <peter@eisentraut.org> Co-authored-by: Matheus Alcantara <matheusssilv97@gmail.com> Reviewed-by: David E. Wheeler <david@justatheory.com> Reviewed-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com> Reviewed-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com> Reviewed-by: Niccolò Fei <niccolo.fei@enterprisedb.com> Discussion: https://www.postgresql.org/message-id/flat/E7C7BFFB-8857-48D4-A71F-88B359FADCFD@justatheory.com
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‎doc/src/sgml/config.sgml‎

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@@ -10954,6 +10954,74 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
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</listitem>
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</varlistentry>
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<varlistentry id="guc-extension-control-path" xreflabel="extension_control_path">
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<term><varname>extension_control_path</varname> (<type>string</type>)
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<indexterm>
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<primary><varname>extension_control_path</varname> configuration parameter</primary>
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</indexterm>
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</term>
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<listitem>
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<para>
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A path to search for extensions, specifically extension control files
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(<filename><replaceable>name</replaceable>.control</filename>). The
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remaining extension script and secondary control files are then loaded
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from the same directory where the primary control file was found.
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See <xref linkend="extend-extensions-files"/> for details.
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</para>
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<para>
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The value for <varname>extension_control_path</varname> must be a
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list of absolute directory paths separated by colons (or semi-colons
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on Windows). If a list element starts
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with the special string <literal>$system</literal>, the
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compiled-in <productname>PostgreSQL</productname> extension
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directory is substituted for <literal>$system</literal>; this
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is where the extensions provided by the standard
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<productname>PostgreSQL</productname> distribution are installed.
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(Use <literal>pg_config --sharedir</literal> to find out the name of
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this directory.) For example:
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<programlisting>
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extension_control_path = '/usr/local/share/postgresql/extension:/home/my_project/share/extension:$system'
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</programlisting>
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or, in a Windows environment:
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<programlisting>
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extension_control_path = 'C:\tools\postgresql\extension;H:\my_project\share\extension;$system'
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</programlisting>
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Note that the path elements should typically end in
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<literal>extension</literal> if the normal installation layouts are
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followed. (The value for <literal>$system</literal> already includes
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the <literal>extension</literal> suffix.)
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</para>
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<para>
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The default value for this parameter is
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<literal>'$system'</literal>. If the value is set to an empty
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string, the default <literal>'$system'</literal> is also assumed.
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</para>
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<para>
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This parameter can be changed at run time by superusers and users
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with the appropriate <literal>SET</literal> privilege, but a
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setting done that way will only persist until the end of the
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client connection, so this method should be reserved for
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development purposes. The recommended way to set this parameter
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is in the <filename>postgresql.conf</filename> configuration
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file.
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</para>
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<para>
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Note that if you set this parameter to be able to load extensions from
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nonstandard locations, you will most likely also need to set <xref
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linkend="guc-dynamic-library-path"/> to a correspondent location, for
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example,
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<programlisting>
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extension_control_path = '/usr/local/share/postgresql/extension:$system'
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dynamic_library_path = '/usr/local/lib/postgresql:$libdir'
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</programlisting>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="guc-gin-fuzzy-search-limit" xreflabel="gin_fuzzy_search_limit">
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<term><varname>gin_fuzzy_search_limit</varname> (<type>integer</type>)
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<indexterm>

‎doc/src/sgml/extend.sgml‎

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@@ -649,6 +649,11 @@ RETURNS anycompatible AS ...
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control file can specify a different directory for the script file(s).
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</para>
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<para>
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Additional locations for extension control files can be configured using
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the parameter <xref linkend="guc-extension-control-path"/>.
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</para>
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<para>
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The file format for an extension control file is the same as for the
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<filename>postgresql.conf</filename> file, namely a list of
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<para>
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The directory containing the extension's <acronym>SQL</acronym> script
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file(s). Unless an absolute path is given, the name is relative to
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the installation's <literal>SHAREDIR</literal> directory. The
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default behavior is equivalent to specifying
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<literal>directory = 'extension'</literal>.
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the installation's <literal>SHAREDIR</literal> directory. By default,
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the script files are looked for in the same directory where the
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control file was found.
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</para>
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</listitem>
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</varlistentry>
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<para>
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The value of this parameter will be substituted for each occurrence
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of <literal>MODULE_PATHNAME</literal> in the script file(s). If it is not
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set, no substitution is made. Typically, this is set to
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<literal>$libdir/<replaceable>shared_library_name</replaceable></literal> and
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set, no substitution is made. Typically, this is set to just
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<literal><replaceable>shared_library_name</replaceable></literal> and
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then <literal>MODULE_PATHNAME</literal> is used in <command>CREATE
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FUNCTION</command> commands for C-language functions, so that the script
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files do not need to hard-wire the name of the shared library.
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setting <varname>PG_CONFIG</varname> to point to its
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<command>pg_config</command> program, either within the makefile
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or on the <literal>make</literal> command line.
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You can also select a separate installation directory for your extension
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by setting the <literal>make</literal> variable <varname>prefix</varname>
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on the <literal>make</literal> command line. (But this will then require
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additional setup to get the server to find the extension there.)
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</para>
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<para>

‎doc/src/sgml/ref/create_extension.sgml‎

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@@ -90,8 +90,10 @@ CREATE EXTENSION [ IF NOT EXISTS ] <replaceable class="parameter">extension_name
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<para>
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The name of the extension to be
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installed. <productname>PostgreSQL</productname> will create the
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extension using details from the file
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<literal>SHAREDIR/extension/</literal><replaceable class="parameter">extension_name</replaceable><literal>.control</literal>.
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extension using details from the file <filename><replaceable
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class="parameter">extension_name</replaceable>.control</filename>,
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found via the server's extension control path (set by <xref
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linkend="guc-extension-control-path"/>.)
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</para>
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</listitem>
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</varlistentry>

‎src/Makefile.global.in‎

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@@ -87,9 +87,19 @@ endif # not PGXS
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#
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# In a PGXS build, we cannot use the values inserted into Makefile.global
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# by configure, since the installation tree may have been relocated.
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# Instead get the path values from pg_config.
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# Instead get the path values from pg_config. But users can specify
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# prefix explicitly, if they want to select their own installation
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# location.
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ifndef PGXS
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ifdef PGXS
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# Extension makefiles should set PG_CONFIG, but older ones might not
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ifndef PG_CONFIG
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PG_CONFIG = pg_config
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endif
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endif
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# This means: if ((not PGXS) or prefix)
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ifneq (,$(if $(PGXS),,1)$(prefix))
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# Note that prefix, exec_prefix, and datarootdir aren't defined in a PGXS build;
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# makefiles may only use the derived variables such as bindir.
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else # PGXS case
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# Extension makefiles should set PG_CONFIG, but older ones might not
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ifndef PG_CONFIG
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PG_CONFIG = pg_config
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endif
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bindir := $(shell $(PG_CONFIG) --bindir)
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datadir := $(shell $(PG_CONFIG) --sharedir)
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sysconfdir := $(shell $(PG_CONFIG) --sysconfdir)

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