mirror of https://github.com/pulumi/pulumi.git
128 lines
3.7 KiB
Go
128 lines
3.7 KiB
Go
// Copyright 2017, Pulumi Corporation. All rights reserved.
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package engine
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/pkg/errors"
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"github.com/pulumi/pulumi/pkg/encoding"
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"github.com/pulumi/pulumi/pkg/pack"
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"github.com/pulumi/pulumi/pkg/workspace"
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)
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type Pkginfo struct {
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Pkg *pack.Package
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Root string
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}
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// GetPwdMain returns the working directory and main entrypoint to use for this package.
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func (pkginfo *Pkginfo) GetPwdMain() (string, string, error) {
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pwd := pkginfo.Root
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main := pkginfo.Pkg.Main
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if main != "" {
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// The path might be relative from the package root; if so, make it absolute.
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if !filepath.IsAbs(main) {
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main = filepath.Join(pwd, main)
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}
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// So that any relative paths inside of the program are correct, we still need to pass the pwd
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// of the main program's parent directory. How we do this depends on if the target is a dir or not.
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maininfo, err := os.Stat(main)
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if err != nil {
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return "", "", errors.Wrapf(err, "project 'main' could not be read")
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}
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if maininfo.IsDir() {
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pwd = main
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main = ""
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} else {
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pwd = filepath.Dir(main)
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main = filepath.Base(main)
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}
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}
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return pwd, main, nil
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}
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// ReadPackageFromArg reads a package from an argument value. It can be "-" to request reading from Stdin, and is
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// interpreted as a path otherwise. If an error occurs, it is printed to Stderr, and the returned value will be nil.
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// In addition to the package, a root directory is returned that the compiler should be formed over, if any.
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func ReadPackageFromArg(arg string) (*Pkginfo, error) {
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// If the arg is "-", read from stdin.
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if arg == "-" {
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return ReadPackageFromStdin()
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}
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// If the path is empty, we need to detect it based on the current working directory.
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var path string
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if arg == "" {
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pwd, err := os.Getwd()
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if err != nil {
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return nil, err
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}
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path = pwd
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// Now that we got here, we have a path, so we will try to load it.
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pkgpath, err := workspace.DetectPackage(path)
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if err != nil {
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return nil, errors.Errorf("could not locate a package to load: %v", err)
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} else if pkgpath == "" {
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return nil, errors.Errorf("no package found by searching upwards from '%v'", path)
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}
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path = pkgpath
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} else {
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path = arg
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}
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// Finally, go ahead and load the package directly from the path that we ended up with.
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return ReadPackage(path)
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}
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// ReadPackageFromStdin attempts to read a package from Stdin; if an error occurs, it will be printed to Stderr, and
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// the returned value will be nil.
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func ReadPackageFromStdin() (*Pkginfo, error) {
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// If stdin, read the package from text, and then create a compiler using the working directory.
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b, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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return nil, errors.Wrapf(err, "could not read package from stdin")
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}
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m := encoding.Marshalers[".json"]
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var pkg pack.Package
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err = m.Unmarshal(b, &pkg)
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if err != nil {
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return nil, errors.Wrap(err, "a problem occurred when unmarshaling stdin into a package")
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}
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if err = pkg.Validate(); err != nil {
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return nil, err
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}
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return &Pkginfo{
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Pkg: &pkg,
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Root: "",
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}, nil
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}
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// ReadPackage attempts to read a package from the given path; if an error occurs, it will be printed to Stderr, and
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// the returned value will be nil. If the path is a directory, nil is returned.
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func ReadPackage(path string) (*Pkginfo, error) {
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// If the path refers to a directory, bail early.
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info, err := os.Stat(path)
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if err != nil {
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return nil, errors.Wrapf(err, "could not read path '%v'", path)
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} else if info.IsDir() {
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return nil, errors.Errorf("path '%v' is a directory and not a path to package file", path)
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}
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pkg, err := pack.Load(path)
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if err != nil {
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return nil, err
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}
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return &Pkginfo{
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Pkg: pkg,
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Root: filepath.Dir(path),
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}, nil
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}
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