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Commit817f2a5

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Remove PL/Tcl's "module" facility.
PL/Tcl has long had a facility whereby Tcl code could be autoloaded froma database table named "pltcl_modules". However, nobody is using it, asevidenced by the recent discovery that it's never been fixed to work withstandard_conforming_strings turned on. Moreover, it's rather shaky froma security standpoint, and the table design is very old and crufty (partlybecause it dates from before we had TOAST). A final problem is thatbecause the table-population scripts depend on the Tcl client libraryPgtcl, which we removed from the core distribution in 2004, it'simpossible to create a self-contained regression test for the feature.Rather than try to surmount these problems, let's just remove it.A follow-on patch will provide a way to execute user-definedinitialization code, similar to features that exist in plperl and plv8.With that, it will be possible to implement this feature or similar onesentirely in userspace, which is where it belongs.Discussion:https://postgr.es/m/22067.1488046447@sss.pgh.pa.us
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‎doc/src/sgml/pltcl.sgml‎

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@@ -902,51 +902,6 @@ if {[catch { spi_exec $sql_command }]} {
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</para>
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</sect1>
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<sect1 id="pltcl-unknown">
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<title>Modules and the <function>unknown</> Command</title>
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<para>
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PL/Tcl has support for autoloading Tcl code when used.
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It recognizes a special table, <literal>pltcl_modules</>, which
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is presumed to contain modules of Tcl code. If this table
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exists, the module <literal>unknown</> is fetched from the table
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and loaded into the Tcl interpreter immediately before the first
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execution of a PL/Tcl function in a database session. (This
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happens separately for each Tcl interpreter, if more than one is
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used in a session; see <xref linkend="pltcl-global">.)
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</para>
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<para>
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While the <literal>unknown</> module could actually contain any
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initialization script you need, it normally defines a Tcl
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<function>unknown</> procedure that is invoked whenever Tcl does
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not recognize an invoked procedure name. <application>PL/Tcl</>'s standard version
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of this procedure tries to find a module in <literal>pltcl_modules</>
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that will define the required procedure. If one is found, it is
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loaded into the interpreter, and then execution is allowed to
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proceed with the originally attempted procedure call. A
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secondary table <literal>pltcl_modfuncs</> provides an index of
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which functions are defined by which modules, so that the lookup
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is reasonably quick.
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</para>
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<para>
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The <productname>PostgreSQL</productname> distribution includes
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support scripts to maintain these tables:
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<command>pltcl_loadmod</>, <command>pltcl_listmod</>,
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<command>pltcl_delmod</>, as well as source for the standard
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<literal>unknown</> module in <filename>share/unknown.pltcl</>. This module
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must be loaded
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into each database initially to support the autoloading mechanism.
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</para>
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<para>
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The tables <literal>pltcl_modules</> and <literal>pltcl_modfuncs</>
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must be readable by all, but it is wise to make them owned and
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writable only by the database administrator. As a security
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precaution, PL/Tcl will ignore <literal>pltcl_modules</> (and thus,
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not attempt to load the <literal>unknown</> module) unless it is
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owned by a superuser. But update privileges on this table can be
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granted to other users, if you trust them sufficiently.
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</para>
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</sect1>
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<sect1 id="pltcl-procnames">
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<title>Tcl Procedure Names</title>
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‎src/pl/tcl/Makefile‎

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all: all-lib
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$(MAKE) -C modules$@
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# Force this dependency to be known even without dependency info built:
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pltcl.o: pltclerrcodes.h
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distprep: pltclerrcodes.h
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install: all install-lib install-data
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$(MAKE) -C modules$@
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installdirs: installdirs-lib
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$(MKDIR_P)'$(DESTDIR)$(datadir)/extension'
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$(MAKE) -C modules$@
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uninstall: uninstall-lib uninstall-data
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$(MAKE) -C modules$@
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install-data: installdirs
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$(INSTALL_DATA)$(addprefix$(srcdir)/,$(DATA))'$(DESTDIR)$(datadir)/extension/'
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ifeq ($(PORTNAME), win32)
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rm -f $(tclwithver).def
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endif
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$(MAKE) -C modules $@
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maintainer-clean: distclean
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rm -f pltclerrcodes.h

‎src/pl/tcl/modules/.gitignore‎

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‎src/pl/tcl/modules/Makefile‎

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‎src/pl/tcl/modules/README‎

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‎src/pl/tcl/modules/pltcl_delmod.in‎

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‎src/pl/tcl/modules/pltcl_listmod.in‎

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