Meson has a lot of advantages over autoconf/make, primarily in ease-of-use and performance. Make meson the only build system used for testing and building the Debian documentation, but leave the RHEL documentation using autoconf/make for now so it gets some testing.
The Perl integration tests were migrated as faithfully as possible, but there was some cruft and a few unit tests that it did not make sense to migrate.
Also remove all Perl code made obsolete by this migration.
All unit, performance, and integration tests are now written in C but significant parts of the test harness remain to be migrated.
This has never been a problem for performance tests since they do not call functions that log at info level or above, but the upcoming integration tests may do so. In any case it is better to disable this functionality outside of unit tests.
This was missed in the C unit test migration and since then a new test was added that was not setting its timezone correctly.
This feature exists to make sure the tests will run on systems with different timezones and has no impact on the core code.
The --no-log-timestamp option was missed when unit test building was migrated to C, which caused test timings to show up in the contributing guide. This caused no harm but did create churn in this file during releases.
Also improve the formatting when test timing is disabled.
Running valgrind and backtrace together has been causing tests to timeout in CI, mostly likely due to limited resources. This has not been a problem in normal development environments.
Since it is still important to run backtraces for debugging, split the u22 test that was doing all this work to run coverage and backtrace together and valgrind-only as a separate test. As a bonus these tests run faster separately and since they run in parallel the total execution time is faster.
The libbacktrace feature has not been working since the move to meson because libbacktrace detection was not added to the meson build. Add libbacktrace to meson and improve the feature so that it can be compiled into release builds.
The prior implementation fetched line numbers with each stack trace push. Not only was this slow but it missed any functions that were not being tracked on our stack.
Instead just examine the backtrace when an error happens and merge it with the info we have on our stack. If the backtrace is not available then the output remains as before.
Also remove --backtrace from test.pl since the library is now auto-detected.
Leave this library out of the production build for now to give it a little time to shake out in testing.
The option to specify the path to psql was shown in the command-line help as --psql-bin but the option was actually named --pgsql-bin.
Rename to match the help so they are consistent.
All unit and performance tests are now built by the C harness.
Remove all unit/performance test build code from Perl.
Remove code from C harness that is no longer used. This code was included so the C harness could be run separately, but that is no longer needed with this full integration.
The C test harness is used for unit tests from the Perl harness where possible. Currently, unit tests can be run in the C harness when --no-coverage is specified and --profile is not specified.
C harness tests work on meson 0.45.
The C harness runs with valgrind by default. Valgrind can be disabled with --no-valgrind.
Also rebuild containers to add meson and update the documentation so that meson builds will work (even though we don't do them yet).
Meson is a new build system that offers simpler syntax and superior performance to autoconf/make. In addition, Windows is supported natively.
The Meson build appears complete, but currently is used only for auto-generation of code and the host build of pgbackrest. Some container upgrades will be required before Meson can be used for container builds.
Also patch the Debian package to force autoconf/make rather than Meson.
Integration expect log testing was originally used as a rough-and-ready way to make sure that certain code paths were being executed before the unit tests existed. Now that we have 100% unit test coverage (with expect log testing) the value of the integration expect tests seems minimal at best.
But they do cause numerous issues:
- Maintenance of the expect code and replacements that are required to keep logs reproducible.
- Even a trivial change can cause massive churn in the expect logs, e.g. d9088b2. These changes should be minutely audited but since the expect logs have little value now it is seldom worth the effort.
- The OS version used to do expect testing (RHEL7) can only be used to test one version of PostgreSQL. This makes it hard to balance the PostgreSQL version testing between OS versions.
- When a commit affects expect logs it is not clear (especially for new developers) how to regenerate them and our contributing guide is silent on the issue.
The goal is to migrate the integration tests to C and expect testing is not part of that plan. It seems best to get rid of them now.
Only set -DDEBUG_MEM for the modules currently being tested rather than globally.
Also run tests in a temp mem context. Running in the top context can confuse memory accounting when a new context is created in the top context.
The unit tests were ignoring stderr but nothing being output there was important. Now a test will fail if there is anything on stderr.
This makes it easier to work with -fsanitize, which outputs to stderr.
Since CentOS 8 will be EOL at the end of the year it makes sense to do this now. The centos:8 image is still used in documentation.xml because changes there require manual testing, which will need to be done at a later date. The changes are not user-facing, however, and can be done at any time.
Also update CentOS references to RHEL since that is what we are emulating for testing purposes.
This is mostly to revert some comment changes in b11ab9f7 that will break the ppc64le patch, but at the same time keep the spelling consistent in all comments and documentation.
Also revert some space changes for the same reason.
These flags are used for all tests but it was not possible to add them to configure before the change in 046d6643. This is especially important for adhoc tests to ensure the flags are not forgotten.
Remove the flags from test make commands where they were being applied.
There is no change for production builds.
The TLS server is an alternative to using SSH for protocol connections to remote hosts.
This command is currently experimental and intended only for trial and testing. As such, the new commands and options will not show up in the command-line help unless directly requested.
Some tests can generate very large error messages for diffs and they often get cut off before the end.
Also fix a test so it does not create too large a buffer on the stack.
Parse enough of config.yaml to auto-generate config.auto.h and config.auto.c.
This commit implements most of the infrastructure needed to migrate the rest of the build code to C, but each set of auto-generated files will present its own challenges.
The build is now dependent on libyaml. At this point there is no need for a hard requirement, but that will come soon so it seems better to add the dependency now.
A define was already added for TEST_PATH but it was not widely used. Replace all occurrences of testPath() with TEST_PATH in the tests.
Replace testUser() with TEST_USER, testGroup() with TEST_GROUP, testRepoPath() with HRN_PATH_REPO, testDataPath() with HRN_PATH, testProjectExe() with TEST_PROJECT_EXE, and testScale() with TEST_SCALE.
Replace {[path]}, {[user]}, {[group]}, etc. with defines and remove hrnReplaceKey(). This is better than having two ways to deal with replacements.
In some cases the original test*() getters were kept because they are used by the harness, which does not have access to the new defines. Move them to harnessTest.intern.h to indicate that the tests should no longer use them.
A shim allows a test harness to access static functions and variables in a C module, and also allows functions to be shimmed (i.e. overridden) for the purposes of testing.
For instance, coverage testing works when a process that is normally exec'd is run as a forked child process instead.
Some version interface test functions were integrated into the core code because they relied on the PostgreSQL versioned interface. Even though they were compiled out for production builds they cluttered the core code and made it harder to determine what was required by core.
Create a PostgreSQL version interface in a test harness to contain these functions. This does require some duplication but the cleaner core code seems a good tradeoff. It is possible for some of this code to be auto-generated but since it is only updated once per year the matter is not pressing.
When building tests only include files covered by the current test or by prior tests. This increases performance (less compilation and linking) and also helps detect cross-dependencies in the code. Since there are currently cross-dependencies the depend option is used to document them and allow compilation. The idea is to resolve them incrementally over time.
Add the harness option to include harness modules when the minimum requirements for compilation are met.
Add the feature option to indicate which features are now available in the harness (based on source modules already tested). This allows conditional compilation in harness modules when some features are not yet available.
The unit test Makefile generation was a hodge-podge of constants and rules based on distros/versions that easily got out of date and did not work on an unknown system. All of this dates from the mixed Perl/C unit test implementation.
Instead use configure to generate most of the important Makefile variables, which allows the unit tests to run on multiple platforms, e.g. MacOS and FreeBSD.
There is plenty of work to be done here and not all the unit tests work on MacOS and FreeBSD for various reasons.
As a POC update the MacOS and FreeBSD tests on Cirrus-CI to run a few command unit tests.
MacOS does not allow files to be removed recursively unless the owner has write and execute permissions on all the directories.
Some tests leave the permissions in a bad state so fix them up before trying to delete.
Messages on stderr were being lost due to the error suppression used to customize the error message.
Also update the formatting to be more informative and concise.
CentOS6 EOL'd and the mirrors were swiftly deleted, leading to failures in tests and documentation.
Remove CentOS 6 for now to get builds going again with the intention to replace it in the near future with CentOS 8.
This loop was using a lot of memory without freeing it at intervals.
Rewrite to use char arrays when possible to reduce memory that needs to be allocated and freed.
Vendorized code is copied from another project when a library is not available and a git subproject won't work. Currently all the vendorized code is copied from PostgreSQL but it makes sense to have a more general mechanism for indicating vendorized code.
The .vendor extension will be used to denote vendorized code in the same way that .auto is used to denote auto-generated code.
These tests required sudo to achieve complete coverage.
Add a new coverage exception, vm_covered, that applies to code that can only be covered in a container. When the test is run outside of a container code sections that require a container will be excluded with TEST_CONTAINER_REQUIRED and the coverage exception will be added to prevent a coverage error.
This does require marking up the core code with vm_covered, which in some modules (e.g. common/io/tls/client) can be extensive. It's possible that some of these tests can be rewritten to be less dependent on sudo but no attempt was made to do that here.
Only allow coverage summaries in a vm since coverage summaries outside a vm will not be complete, which was true even before this commit.
There are a number of Valgrind errors on Ubuntu 12.04 which do not happen on newer distro versions. However, suppressions for these errors have masked legitimate issues in subsequent code.
Instead, make suppressions VM specific so errors in other VMs are not masked.
bzip2 is a widely available, high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), while being around twice as fast at compression and six times faster at decompression.
bzip2 is currently available on all supported platforms.
Zstandard is a fast lossless compression algorithm targeting real-time compression scenarios at zlib-level and better compression ratios. It's backed by a very fast entropy stage, provided by Huff0 and FSE library.
Zstandard version >= 1.0 is required, which is generally only available on newer distributions.
Allows casting const-ness away from an expression, but doesn't allow changing the type. Enforcement of the latter currently only works for gcc-like compilers.
Note that it is not safe to cast const-ness away if the result will ever be modified (it would be undefined behavior). Doing so can cause compiler mis-optimizations or runtime crashes (by modifying read-only memory). It is only safe to use when the result will not be modified, but API design or language restrictions prevent you from declaring that (e.g. because a function returns both const and non-const variables).
Note that this only works in function scope, not for global variables (it would be nice, but not trivial, to improve that).
UNCONSTIFY() requires static assert which is a feature in its own right.
Decisions about when to optimize or enable debug code were spread out in too many places making it hard to keep them consistent.
Centralize the logic as much as possible to make it easier to maintain.
The old coverage data has been recorded so it is no longer needed. In newer versions of gcc leaving this file around can lead to an error when writing profile data after forking off to a non-pgbackrest binary (which we do in some unit tests).
