gcc < 9 makes all compound literals function scope, even though the C spec requires them to be invalid outside the current scope. Since the compiler and valgrind were not enforcing this we had a few violations which caused problems in gcc >= 9.
Even though we are not quite ready to support gcc 9 officially, fix the scoping violations that currently exist in the codebase.
Reported by chrlange, Ned T. Crigler.
Maintaining the storage layer/drivers in two languages is burdensome. Since the integration tests require the Perl storage layer/drivers we'll need them even after the core code is migrated to C. Create an interface layer so the Perl code can be removed and new storage drivers/features introduced without adding Perl equivalents.
The goal is to move the integration tests to C so this interface will eventually be removed. That being the case, the interface was designed for maximum compatibility to ease the transition. The result looks a bit hacky but we'll improve it as needed until it can be retired.
Not all storage types support paths as a physical thing that must be created/destroyed. Add a feature to determine which drivers use paths and simplify the driver API as much as possible given that knowledge and by implementing as much path logic as possible in the Storage object.
Remove the ignoreMissing parameter from pathSync() since it is not used and makes little sense.
Create a standard list of error messages for the drivers to use and apply them where the code was modified -- there is plenty of work still to be done here.
Remove "File" and "Driver" from object names so they are shorter and easier to keep consistent.
Also remove the "driver" directory so storage implementations are visible directly under "storage".
The function pointer casting used when creating drivers made changing interfaces difficult and led to slightly divergent driver implementations. Unit testing caught production-level errors but there were a lot of small issues and the process was harder than it should have been.
Use void pointers instead so that no casts are required. Introduce the THIS_VOID and THIS() macros to make dealing with void pointers a little safer.
Since we don't want to expose void pointers in header files, driver functions have been removed from the headers and the various driver objects return their interface type. This cuts down on accessor methods and the vast majority of those functions were not being used. Move functions that are still required to .intern.h.
Remove the special "C" crypto functions that were used in libc and instead use the standard interface.
Use autoconf to provide a basic configure script. WITH_BACKTRACE is yet to be migrated to configure and the unit tests still use a custom Makefile.
Each C file must include "build.auto.conf" before all other includes and defines. This is enforced by test.pl for includes, but it won't detect incorrect define ordering.
Update packages to call configure and use standard flags to pass options.
We have been using a hacked-up JSON generator to pass options from C to Perl since the C binary was introduced. This generator was not very compliant which led to issues with \n, ", etc. inside strings.
We have a fully-compliant JSON generator now so use that instead.
Reported by Leo Khomenko.
Some of the old names conflict with the new functions that must be created to implement the filter. Rename these to cipherBlock*C() to indicate that they take C-style parameters.
These functions are only used by the Perl LibC code and will be removed or refactored eventually.
A simple, secure TLS client intended to allow access to services that are exposed via HTTPS. We call it TLS instead of SSL because SSL methods are disabled so only TLS connections are allowed.
This object is intended to be used for multiple TLS connections against a service so tlsClientOpen() can be called each time a new connection is needed. By default, an open connection will be reused for pipelining so the user must be prepared to retry their transaction on a read/write error if the server closes the connection before it can be reused. If this behavior is not desirable then tlsClientClose() may be used to ensure that the next call to tlsClientOpen() will create a new TLS session.
Note that tlsClientRead() is non-blocking unless there are *zero* bytes to be read from the session in which case it will raise an error after the defined timeout. In any case the tlsClientRead()/tlsClientWrite()/tlsClientEof() functions should not generally be called directly. Instead use the read/write interfaces available from tlsClientIoRead()/tlsClientIoWrite().
Add XmlDocument, XmlNode, and XmlNodeList objects as a thin interface layer on libxml2.
This interface is not intended to be comprehensive. Only a few libxml2 capabilities are exposed but more can be added as needed.
The Wait object accepted a double in the constructor for wait time but used TimeMSec internally. This was done for compatibility with the Perl code.
Instead, use TimeMSec in the Wait constructor and make changes as needed to calling code.
Note that Perl still uses a double for its Wait object so translation is needed in some places. There are no plans to update the Perl code as it will become obsolete.
Code generation saved files even when they had not changed, which often caused code generation cascades. So, don't save files unless they have changed.
Use rsync to determine which files have changed since the last test run. The manifest of changed files is saved and not removed until all code generation and builds have completed. If an error occurs the work will be redone on the next run.
The eventual goal is to do all the builds from the test/repo directory created by rsync but for now it is only used to track changes.
The external storage interfaces (Storage, StorageFileRead, etc.) have been stable for a while, but internally they were calling the posix driver functions directly.
Create driver interfaces for storage, fileRead, and fileWrite and remove all references to the posix driver outside storage/driver/posix (with the exception of a direct call to pathRemove() in Perl LibC).
Posix is still the only available driver so more adjustment may be needed, but this should represent the bulk of the changes.
The posix driver was developed over time and the naming is not very consistent.
Rename the files and functions to work well with other drivers and generally favor longer names since the driver functions are seldom (eventually never) used outside the driver itself.
common/harnessLog was not ideally suited for general testing and made all the tests quite awkward. Instead, move all code used to test the common/log module into the logTest module and repurpose common/harnessLog to do log expect testing for all other tests in a cleaner way.
Add a few exceptions for config testing since the log levels are reset by default in config/parse.
Low-level functions only include stack trace in test builds while higher-level functions ship with stack trace built-in. Stack traces include all parameters passed to the function but production builds only create the parameter list when the log level is set high enough, i.e. debug or trace depending on the function.
Bug Fixes:
* Fix directory syncs running recursively when only the specified directory should be synced. (Reported by Craig A. James.)
* Fix archive-copy throwing "path not found" error for incr/diff backups. (Reported by yummyliu, Vitaliy Kukharik.)
* Fix failure in manifest build when two or more files in PGDATA are linked to the same directory. (Reported by Vitaliy Kukharik.)
* Fix delta restore failing when a linked file is missing.
* Fix rendering of key/value and list options in help. (Reported by Clinton Adams.)
Features:
* Add asynchronous, parallel archive-get. This feature maintains a queue of WAL segments to help reduce latency when PostgreSQL requests a WAL segment with restore_command.
* Add support for additional pgBackRest configuration files in the directory specified by the --config-include-path option. Add --config-path option for overriding the default base path of the --config and --config-include-path option. (Contributed by Cynthia Shang.)
* Add repo-s3-token option to allow temporary credentials tokens to be configured. pgBackRest currently has no way to request new credentials so the entire command (e.g. backup, restore) must complete before the credentials expire. (Contributed by Yogesh Sharma.)
Improvements:
* Update the archive-push-queue-max, manifest-save-threshold, and buffer-size options to accept values in KB, MB, GB, TB, or PB where the multiplier is a power of 1024. (Contributed by Cynthia Shang.)
* Make backup/restore path sync more efficient. Scanning the entire directory can be very expensive if there are a lot of small tables. The backup manifest contains the path list so use it to perform syncs instead of scanning the backup/restore path.
* Show command parameters as well as command options in initial info log message.
* Rename archive-queue-max option to archive-push-queue-max to avoid confusion with the new archive-get-queue-max option. The old option name will continue to be accepted.
pgBackRest currently has no way to request new credentials so the entire command (e.g. backup, restore) must complete before the credentials expire.
Contributed by Yogesh Sharma.
* Add storageCopy(), storageMove(), and storagePathSync().
* Separate StorageFile object into separate read and write objects.
* Abstract out Posix file read/write objects.
Configuration files are loaded from the directory specified by the --config-include-path option.
Add --config-path option for overriding the default base path of the --config and --config-include-path option.
Contributed by Cynthia Shang.
Mainly this helps with unit tests that need to do log expect testing. Add harnessCfgLoad() test function, which allows a new config to be loaded for unit testing without resetting log functions, opening a log file, or taking locks.
Now only two types of locks can be taken: archive and backup. Most commands use one or the other but the stanza-* commands acquire both locks. This provides better protection than the old command-based locking scheme.
This implementation should be faster because it does not stat each file. It simply assumes that most directory entries are files so attempts an unlink() first. If the entry is reported by error codes to be a directory then it attempts an rmdir().
