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Presently, the archiver process restarts when an archive callback ERRORs. To avoid this, archive module authors can use sigsetjmp(), manage a memory context, etc., but that requires a lot of extra code that will likely look roughly the same between modules. This commit adds basic archive callback ERROR handling to pgarch.c so that module authors won't ordinarily need to worry about this. While this built-in handler attempts to clean up anything that an archive module could conceivably have left behind, it is possible that some modules are doing unexpected things that require additional cleanup. Module authors should be sure to do any extra required cleanup in a PG_CATCH block within the archiving callback. The archiving callback is now called in a short-lived memory context that the archiver process resets between invocations. If a module requires longer-lived storage, it must maintain its own memory context. Thanks to these changes, the basic_archive module can be greatly simplified. Suggested-by: Andres Freund Reviewed-by: Andres Freund, Yong Li Discussion: https://postgr.es/m/20230217215624.GA3131134%40nathanxps13
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.