This is a partial implementation of remote storage with just enough functionality to get the info command working. The client is written in C but the server is still in Perl, which limits progress until a C server is written.
This is a complete protocol client implementation in C.
Currently there is no C server implementation so the C client is talking to a Perl server. This won't work very long, though, as the protocol format, even though in JSON, has a lot of language-specific structure. While it would be possible to maintain compatibility between C and Perl it's probably not worth the effort in the long run.
Just as in Perl there are helper functions to make constructing protocol objects easier. Currently only repository remotes are supported.
Executes a child process and allows the calling process to communicate with it using read/write io.
This object is specially tailored to implement the protocol layer and may or may not be generally applicable to general purpose
execution.
Parameters for the local/remote commands are based on parameters that are passed to the current command.
Generate parameters for the new command based on the intersection of parameters between the current command and the command to be executed.
General i/o objects for reading and writing file descriptors, in particular those that can block. In other words, these are not generally to be used with file descriptors for actual files, but rather pipes, sockets, etc.
The C code can't get the cipher type from the storage object because the C storage object does not have encryption baked in like the Perl code does.
Instead, check backup.info to see if encryption is enabled. This will need to rethought if another cipher type is added but for now it works fine.
Replace the repository path with just "the repository". The path is not important in this context and it is clearer to state where the stanzas are missing from.
The prior behavior was to throw an exception but this was not very helpful when something unexpected happened. Better to at least emit the error message even if the error code is not very helpful.
There were some small differences in ordering and how the C version handled missing directories. It may be that the C version is more consistent, but for now it is more important to be compatible with the Perl version.
These differences were missed because the C info command was not wired into main.c so it was not being tested in regression. This commit does not fix the wiring issue because there will likely be a release soon and it is too big a change to put in at the last moment.
Casting to int caused large values to be slightly inaccurate so cast to uint64_t instead.
Also, use multiplication where possible since the compiler should precompute multiplied values.
SIGPIPE immediately terminates the process but we would rather catch the EPIPE error and gracefully shutdown.
Ignore SIGPIPE and throw the EPIPE error via normal error handling.
Including the C module after the headers required for testing meant that if headers were missing from the C module they were not caught while directly testing the C module.
The missing headers were caught in general testing, but it is frustrating to get an error in a module that has already passed while testing another module or running CI.
Move the C module include to the very top so missing headers cause immediate failures.
Bug Fixes:
* Remove request for S3 object info directly after putting it. (Reported by Matt Kunkel.)
* Correct archive-get-queue-max to be size type. (Reported by Ronan Dunklau.)
* Add error message when current user uid/gid does not map to a name. (Reported by Camilo Aguilar.)
* Error when --target-action=shutdown specified for PostgreSQL < 9.5.
Improvements:
* Set TCP keepalives on S3 connections. (Suggested by Ronan Dunklau.)
* Reorder info command text output so most recent backup is output last. (Contributed by Cynthia Shang. Suggested by Ryan Lambert.)
* Change file ownership only when required.
* Redact authentication header when throwing S3 errors. (Suggested by Brad Nicholson.)
Admonitions call out places where the user should take special care.
Support added for HTML, PDF, Markdown and help text renderers. XML files have been updated accordingly.
Contributed by Cynthia Shang.
After a stanza-upgrade backups for the old cluster are displayed until they expire. Cluster info was output newest to oldest which meant after an upgrade the most recent backup would no longer be output last.
Update the text output ordering so the most recent backup is always output last.
Contributed by Cynthia Shang.
Suggested by Ryan Lambert.
The info command will only be executed in C if the repository is local, i.e. not located on a remote repository host. S3 is considered "local" in this case.
This is a direct migration from Perl to integrate as seamlessly with the remaining Perl code as possible. It should not be possible to determine if the C version is running unless debug-level logging is enabled.
Contributed by Cynthia Shang.
The infoBackup object is the counterpart to the infoArchive object which encapsulates the archive.info file.
Currently the object is read-only, i.e. it is not possible to create a new or modify an existing backup.info file.
There a number of constants that will also be used in the infoManifest object so go ahead and create a module to contain them so they don't need to be moved later.
Contributed by Cynthia Shang.
Some commands (e.g. info) do not take a stanza or the stanza is optional. In that case it is the job of the command to construct the repository path with a stanza as needed.
Update helper functions to omit the stanza from the constructed path when it is NULL.
Contributed by Cynthia Shang.
- Add detail to errors when info files are loaded with incorrect encryption settings.
- Throw FileMissingError rather than FileOpenError when both copies of the info file are missing.
- If one file is present (but errors) and the other is missing, then return the error for the file that was present.
Contributed by Cynthia Shang.
Previously chown() would be called even when no ownership changes were required.
In most cases changes are not required and it seems better to perform an extra stat() rather than an extra chown().
Also add unit tests for owner() since there weren't any.
This got missed in 1f8931f7 when the test binary was renamed.
Also output call graph along with the flat report. The flat report is generally most useful but it doesn't hurt to have both.
The previous error message only showed the last error. In addition, some errors were missed (such as directory permission errors) that could prevent the copy from being checked.
Show both errors below a generic "unable to load" error. Details are now given explaining exactly why the primary and copy failed.
Previously if one file could not be loaded a warning would be output. This has been removed because it is not clear what the user should do in this case. Should they do a stanza-create --force? Maybe the best idea is to automatically repair the corrupt file, but on the other hand that might just spread corruption if pgBackRest makes the wrong choice.
The decryption filter was added in archiveGetFile() and archiveGetCheck() was modified to return the WAL decryption key stored in archive.info. The rest was plumbing.
The mock/archive/1 integration test added encryption to provide coverage for the new code paths while mock/archive/2 dropped encryption to provide coverage for the existing code paths. This caused some churn in the expect logs but there was no change in behavior.
If InOut filters were placed next to each other then the second filter would never get a NULL input signaling it to flush. This arrangement only worked if the second filter had some other indication that it should flush, such as a decompression filter where the flush is indicated in the input stream.
This is not a live issue because currently no InOut filters are chained together.
This allows CipherBlock to be used as a filter in an IoFilterGroup. The C-style functions used by Perl are now deprecated and should not be used for any new code.
Also add functions to convert between cipher names and CipherType.
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.
