This command is handy for development, so I whipped up a quick implementation.
All it does is print all known husks with their associated deployment time
and resource count (if any, or "n/a" for initialized husks with no deployments).
This change partially implements pulumi/coconut#94, by adding the
ability to name targets during creation and reuse those names during
deletion and update. This simplifies the management of deployment
records, checkpoints, and snapshots.
I've opted to call these things "husks" (perhaps going overboard with
joy after our recent renaming). The basic idea is that for any
executable Nut that will be deployed, you have a nutpack/ directory
whose layout looks roughly as follows:
nutpack/
bin/
Nutpack.json
... any other compiled artifacts ...
husks/
... one snapshot per husk ...
For example, if we had a stage and prod husk, we would have:
nutpack/
bin/...
husks/
prod.json
stage.json
In the prod.json and stage.json files, we'd have the most recent
deployment record for that environment. These would presumably get
checked in and versioned along with the overall Nut, so that we
can use Git history for rollbacks, etc.
The create, update, and delete commands look in the right place for
these files automatically, so you don't need to manually supply them.
This change repivots the plan/apply commands slightly. This is largely
in preparation for performing deletes and updates of existing environments.
The old way was slightly confusing and made things appear more "magical"
than they actually are. Namely, different things are needed for different
kinds of deployment operations, and trying to present them each underneath
a single pair of CLI commands just leads to weird modality and options.
The new way is to offer three commands: create, update, and delete. Each
does what it says on the tin: create provisions a new environment, update
makes resource updates to an existing one, and delete tears down an existing
one entirely. The arguments are what make this interesting: create demands
a MuPackage to evaluate (producing the new desired state snapshot), update
takes *both* an existing snapshot file plus a MuPackage to evaluate (producing
the new desired state snapshot to diff against the existing one), and delete
merely takes an existing snapshot file and no MuPackage, since all it must
do is tear down an existing known environment.
Replacing the plan functionality is the --dry-run (-n) flag that may be
passed to any of the above commands. This will print out the plan without
actually performing any opterations.
All commands produce serializable resource files in the MuGL file format,
and attempt to do smart things with respect to backups, etc., to support the
intended "Git-oriented" workflow of the pure CLI dev experience.
This changes a few things with dependency probing:
1) Probe for Mupack files, not Mufiles.
2) Substitute defaults in the PackageURL before probing.
3) Trace the full search paths when an import fails to resolve.
This will help diagnose dependency resolution issues.
This change further merges the new AST and MuPack/MuIL formats and
abstractions into the core of the compiler. A good amount of the old
code is gone now; I decided against ripping it all out in one fell
swoop so that I can methodically check that we are preserving all
relevant decisions and/or functionality we had in the old model.
The changes are too numerous to outline in this commit message,
however, here are the noteworthy ones:
* Split up the notion of symbols and tokens, resulting in:
- pkg/symbols for true compiler symbols (bound nodes)
- pkg/tokens for name-based tokens, identifiers, constants
* Several packages move underneath pkg/compiler:
- pkg/ast becomes pkg/compiler/ast
- pkg/errors becomes pkg/compiler/errors
- pkg/symbols becomes pkg/compiler/symbols
* pkg/ast/... becomes pkg/compiler/legacy/ast/...
* pkg/pack/ast becomes pkg/compiler/ast.
* pkg/options goes away, merged back into pkg/compiler.
* All binding functionality moves underneath a dedicated
package, pkg/compiler/binder. The legacy.go file contains
cruft that will eventually go away, while the other files
represent a halfway point between new and old, but are
expected to stay roughly in the current shape.
* All parsing functionality is moved underneath a new
pkg/compiler/metadata namespace, and we adopt new terminology
"metadata reading" since real parsing happens in the MetaMu
compilers. Hence, Parser has become metadata.Reader.
* In general phases of the compiler no longer share access to
the actual compiler.Compiler object. Instead, shared state is
moved to the core.Context object underneath pkg/compiler/core.
* Dependency resolution during binding has been rewritten to
the new model, including stashing bound package symbols in the
context object, and detecting import cycles.
* Compiler construction does not take a workspace object. Instead,
creation of a workspace is entirely hidden inside of the compiler's
constructor logic.
* There are three Compile* functions on the Compiler interface, to
support different styles of invoking compilation: Compile() auto-
detects a Mu package, based on the workspace; CompilePath(string)
loads the target as a Mu package and compiles it, regardless of
the workspace settings; and, CompilePackage(*pack.Package) will
compile a pre-loaded package AST, again regardless of workspace.
* Delete the _fe, _sema, and parsetree phases. They are no longer
relevant and the functionality is largely subsumed by the above.
...and so very much more. I'm surprised I ever got this to compile again!
This change makes workspace file naming a little more consistent with respect
to Mufile naming. Instead of having a .mu/ directory, under which a workspace.yaml
and/or a stacks directory might exist, we now have a Muspace.yaml (or .json) file,
and a .Mudeps/ directory. This has nicer symmetric with respect to Mu.yaml files.
This change adds a new Diagable interface from which you can obtain
a diagnostic's location information (Document and Location). A new
At function replaces WithDocument, et al., and will be used soon to
permit all arbitrary AST nodes to report back their position.
This change implements dependency versions, including semantic analysis, per the
checkin 83030685c3.
There's quite a bit in here but at a top-level this parses and validates dependency
references of the form
[[proto://]base.url]namespace/.../name[@version]
and verifies that the components are correct, as well as binding them to symbols.
These references can appear in two places at the moment:
* Service types.
* Cluster dependencies.
As part of this change, a number of supporting changes have been made:
* Parse Workspaces using a full-blown parser, parser analysis, and semantic analysis.
This allows us to share logic around the validation of common AST types. This also
moves some of the logic around loading workspace.yaml files back to the parser, where
it can be unified with the way we load Mu.yaml files.
* New ast.Version and ast.VersionSpec types. The former represents a precise version
-- either a specific semantic version or a short or long Git SHA hash -- and the
latter represents a range -- either a Version, "latest", or a semantic range.
* New ast.Ref and ast.RefParts types. The former is an unparsed string that is
thought to contain a Ref, while the latter is a validated Ref that has been parsed
into its components (Proto, Base, Name, and Version).
* Added some type assertions to ensure certain structs implement certain interfaces,
to speed up finding errors. (And remove the coercions that zero-fill vtbl slots.)
* Be consistent about prefixing error types with Error or Warning.
* Organize the core compiler driver's logic into three methods, FE, sema, and BE.
* A bunch of tests for some of the above ... more to come in an upcoming change.
This change adds support for Workspaces, a convenient way of sharing settings
among many Stacks, like default cluster targets, configuration settings, and the
like, which are not meant to be distributed as part of the Stack itself.
The following things are included in this checkin:
* At workspace initialization time, detect and parse the .mu/workspace.yaml
file. This is pretty rudimentary right now and contains just the default
cluster targets. The results are stored in a new ast.Workspace type.
* Rename "target" to "cluster". This impacts many things, including ast.Target
being changed to ast.Cluster, and all related fields, the command line --target
being changed to --cluster, various internal helper functions, and so on. This
helps to reinforce the desired mental model.
* Eliminate the ast.Metadata type. Instead, the metadata moves directly onto
the Stack. This reflects the decision to make Stacks "the thing" that is
distributed, versioned, and is the granularity of dependency.
* During cluster targeting, add the workspace settings into the probing logic.
We still search in the same order: CLI > Stack > Workspace.
This change includes logic to resolve dependencies declared by stacks. The design
is described in https://github.com/marapongo/mu/blob/master/docs/deps.md.
In summary, each stack may declare dependencies, which are name/semver pairs. A
new structure has been introduced, ast.Ref, to distinguish between ast.Names and
dependency names. An ast.Ref includes a protocol, base part, and a name part (the
latter being an ast.Name); for example, in "https://hub.mu.com/mu/container/",
"https://" is the protocol, "hub.mu.com/" is the base, and "mu/container" is the
name. This is used to resolve URL-like names to package manager-like artifacts.
The dependency resolution phase happens after parsing, but before semantic analysis.
This is because dependencies are "source-like" in that we must load and parse all
dependency metadata files. We stick the full transitive closure of dependencies
into a map attached to the compiler to avoid loading dependencies multiple times.
Note that, although dependencies prohibit cycles, this forms a DAG, meaning multiple
inbound edges to a single stack may come from multiple places.
From there, we rely on ordinary visitation to deal with dependencies further.
This includes inserting symbol entries into the symbol table, mapping names to the
loaded stacks, during the first phase of binding so that they may be found
subsequently when typechecking during the second phase and beyond.
This change introduces a Workspace interface that can be used as a first
class object. We will embellish this as we start binding to dependencies,
which requires us to search multiple paths. This change also introduces a
workspace.InstallRoot() function to fetch the Mu install path.
This change moves the workspace and Mufile detection logic out of the compiler
package and into the workspace one.
This also sketches out the overall workspace structure. A workspace is "delimited"
by the presence of a .mu/ directory anywhere in the parent ancestry. Inside of that
directory we have an optional .mu/clusters.yaml (or .json) file containing cluster
settings shared among the whole workspace. We also have an optional .mu/stacks/
directory that contains dependencies used during package management.
The notion of a "global" workspace will also be present, which is essentially just
a .mu/ directory in your home, ~/.mu/, that has an equivalent structure, but can be
shared among all workspaces on the same machine.
This change recognizes .yml in addition to the official .yaml extension,
since .yml is actually very commonly used. In addition, while in here, I've
centralized more of the extensions logic so that it's more "data-driven"
and easier to manage down the road (one place to change rather than two).
This adds a bunch of general scaffolding and the beginning of a `build` command.
The general engineering scaffolding includes:
* Glide for dependency management.
* A Makefile that runs govet and golint during builds.
* Google's Glog library for logging.
* Cobra for command line functionality.
The Mu-specific scaffolding includes some packages:
* mu/pkg/diag: A package for compiler-like diagnostics. It's fairly barebones
at the moment, however we can embellish this over time.
* mu/pkg/errors: A package containing Mu's predefined set of errors.
* mu/pkg/workspace: A package containing workspace-related convenience helpers.
in addition to a main entrypoint that simply wires up and invokes the CLI. From
there, the mu/cmd package takes over, with the Cobra-defined CLI commands.
Finally, the mu/pkg/compiler package actually implements the compiler behavior.
Or, it will. For now, it simply parses a JSON or YAML Mufile into the core
mu/pkg/api types, and prints out the result.
