4 Commits (e8ee3f14a4ffcc5df888b2ec2b4e3bec1162dce7)

Author	SHA1	Message	Date
Martin Atkins	eb7aaf2414	configload: Configuration snapshots ... Here we introduce a new idea of a "configuration snapshot", which is an in-memory copy of the source code of each of the files that make up the configuration. The primary intended purpose for this is as an intermediate step before writing the configuration files into a plan file, and then reading them out when that plan file is later applied. During earlier configs package development we expected to use an afero vfs implementation to read directly from the zip file, but that doesn't work in practice because we need to preserve module paths from the source file system that might include parent directory traversals (../) while retaining the original path for use in error messages. The result, for now, is a bit of an abstraction inversion: we implement a specialized afero vfs implementation that makes the sparse filesystem representation from a snapshot appear like a normal filesystem just well enough that the config loader and parser can work with it. In future we may wish to rework the internals here so that the main abstraction is at a similar level to the snapshot and then that API is mapped to the native filesystem in the normal case, removing afero. For now though, this approach avoids the need for a significant redesign of the parser/loader internals, at the expense of some trickiness in the case where we're reading from a snapshot. This commit does not yet include the reading and writing of snapshots into plan files. That will follow in a subsequent commit.	8 years ago
Martin Atkins	70f1635416	configs: record the source directory for modules ... We can only do this when modules are loaded with Parser.LoadConfigDir, but in practice this is the common case anyway. This is important to support the path.module and path.root expressions in configuration.	8 years ago
Martin Atkins	7c8efe103e	configs: allow overrides files to omit args that primary files can't ... Some of the fields in our config structs are either mandatory in primary files or there is a default value that we apply if absent. Unfortunately override files impose the additional constraint that we be allowed to omit required fields (which have presumably already been set in the primary files) and that we are able to distinguish between a default value and omitting a value entirely. Since most of our fields were already acceptable for override files, here we just add some new fields to deal with the few cases where special handling is required and a helper function to disable the "Required" flag on attributes in a given schema.	8 years ago
Martin Atkins	4e5efa498a	configs: Parser.LoadConfigDir ... This method wraps LoadConfigFile to load all of the .tf and .tf.json files in a given directory and then bundle them together into a Module object. This function also deals with the distinction between primary and override files, first appending together the primary files in lexicographic order by filename, and then merging in override files in the same order. The merging behavior is not fully implemented as of this commit, and so will be expanded in future commits.	8 years ago