diff options
author | Thomas Voss <mail@thomasvoss.com> | 2024-09-13 13:01:48 +0200 |
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committer | Thomas Voss <mail@thomasvoss.com> | 2024-09-13 13:01:48 +0200 |
commit | 548090e67f66acf84385c4152ca464e52d3e3319 (patch) | |
tree | 9b6de528bd7b0aa63362fa83f5c8e6a97f68a5d8 /vendor/golang.org/x/tools/go/packages/external.go | |
parent | a1d809960bee74df19c7e5fc34ffd1e4757cfdcb (diff) |
Migrate away from templ and towards html/template
Diffstat (limited to 'vendor/golang.org/x/tools/go/packages/external.go')
-rw-r--r-- | vendor/golang.org/x/tools/go/packages/external.go | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/vendor/golang.org/x/tools/go/packages/external.go b/vendor/golang.org/x/tools/go/packages/external.go new file mode 100644 index 0000000..c2b4b71 --- /dev/null +++ b/vendor/golang.org/x/tools/go/packages/external.go @@ -0,0 +1,156 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package packages + +// This file defines the protocol that enables an external "driver" +// tool to supply package metadata in place of 'go list'. + +import ( + "bytes" + "encoding/json" + "fmt" + "os" + "os/exec" + "strings" +) + +// DriverRequest defines the schema of a request for package metadata +// from an external driver program. The JSON-encoded DriverRequest +// message is provided to the driver program's standard input. The +// query patterns are provided as command-line arguments. +// +// See the package documentation for an overview. +type DriverRequest struct { + Mode LoadMode `json:"mode"` + + // Env specifies the environment the underlying build system should be run in. + Env []string `json:"env"` + + // BuildFlags are flags that should be passed to the underlying build system. + BuildFlags []string `json:"build_flags"` + + // Tests specifies whether the patterns should also return test packages. + Tests bool `json:"tests"` + + // Overlay maps file paths (relative to the driver's working directory) + // to the contents of overlay files (see Config.Overlay). + Overlay map[string][]byte `json:"overlay"` +} + +// DriverResponse defines the schema of a response from an external +// driver program, providing the results of a query for package +// metadata. The driver program must write a JSON-encoded +// DriverResponse message to its standard output. +// +// See the package documentation for an overview. +type DriverResponse struct { + // NotHandled is returned if the request can't be handled by the current + // driver. If an external driver returns a response with NotHandled, the + // rest of the DriverResponse is ignored, and go/packages will fallback + // to the next driver. If go/packages is extended in the future to support + // lists of multiple drivers, go/packages will fall back to the next driver. + NotHandled bool + + // Compiler and Arch are the arguments pass of types.SizesFor + // to get a types.Sizes to use when type checking. + Compiler string + Arch string + + // Roots is the set of package IDs that make up the root packages. + // We have to encode this separately because when we encode a single package + // we cannot know if it is one of the roots as that requires knowledge of the + // graph it is part of. + Roots []string `json:",omitempty"` + + // Packages is the full set of packages in the graph. + // The packages are not connected into a graph. + // The Imports if populated will be stubs that only have their ID set. + // Imports will be connected and then type and syntax information added in a + // later pass (see refine). + Packages []*Package + + // GoVersion is the minor version number used by the driver + // (e.g. the go command on the PATH) when selecting .go files. + // Zero means unknown. + GoVersion int +} + +// driver is the type for functions that query the build system for the +// packages named by the patterns. +type driver func(cfg *Config, patterns ...string) (*DriverResponse, error) + +// findExternalDriver returns the file path of a tool that supplies +// the build system package structure, or "" if not found." +// If GOPACKAGESDRIVER is set in the environment findExternalTool returns its +// value, otherwise it searches for a binary named gopackagesdriver on the PATH. +func findExternalDriver(cfg *Config) driver { + const toolPrefix = "GOPACKAGESDRIVER=" + tool := "" + for _, env := range cfg.Env { + if val := strings.TrimPrefix(env, toolPrefix); val != env { + tool = val + } + } + if tool != "" && tool == "off" { + return nil + } + if tool == "" { + var err error + tool, err = exec.LookPath("gopackagesdriver") + if err != nil { + return nil + } + } + return func(cfg *Config, words ...string) (*DriverResponse, error) { + req, err := json.Marshal(DriverRequest{ + Mode: cfg.Mode, + Env: cfg.Env, + BuildFlags: cfg.BuildFlags, + Tests: cfg.Tests, + Overlay: cfg.Overlay, + }) + if err != nil { + return nil, fmt.Errorf("failed to encode message to driver tool: %v", err) + } + + buf := new(bytes.Buffer) + stderr := new(bytes.Buffer) + cmd := exec.CommandContext(cfg.Context, tool, words...) + cmd.Dir = cfg.Dir + // The cwd gets resolved to the real path. On Darwin, where + // /tmp is a symlink, this breaks anything that expects the + // working directory to keep the original path, including the + // go command when dealing with modules. + // + // os.Getwd stdlib has a special feature where if the + // cwd and the PWD are the same node then it trusts + // the PWD, so by setting it in the env for the child + // process we fix up all the paths returned by the go + // command. + // + // (See similar trick in Invocation.run in ../../internal/gocommand/invoke.go) + cmd.Env = append(slicesClip(cfg.Env), "PWD="+cfg.Dir) + cmd.Stdin = bytes.NewReader(req) + cmd.Stdout = buf + cmd.Stderr = stderr + + if err := cmd.Run(); err != nil { + return nil, fmt.Errorf("%v: %v: %s", tool, err, cmd.Stderr) + } + if len(stderr.Bytes()) != 0 && os.Getenv("GOPACKAGESPRINTDRIVERERRORS") != "" { + fmt.Fprintf(os.Stderr, "%s stderr: <<%s>>\n", cmdDebugStr(cmd), stderr) + } + + var response DriverResponse + if err := json.Unmarshal(buf.Bytes(), &response); err != nil { + return nil, err + } + return &response, nil + } +} + +// slicesClip removes unused capacity from the slice, returning s[:len(s):len(s)]. +// TODO(adonovan): use go1.21 slices.Clip. +func slicesClip[S ~[]E, E any](s S) S { return s[:len(s):len(s)] } |