99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
package loader
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import (
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"fmt"
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"runtime"
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"sort"
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"strings"
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"honnef.co/go/tools/go/buildid"
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"honnef.co/go/tools/lintcmd/cache"
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)
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// computeHash computes a package's hash. The hash is based on all Go
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// files that make up the package, as well as the hashes of imported
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// packages.
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func computeHash(c *cache.Cache, pkg *PackageSpec) (cache.ActionID, error) {
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key := c.NewHash("package " + pkg.PkgPath)
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fmt.Fprintf(key, "goos %s goarch %s\n", runtime.GOOS, runtime.GOARCH)
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fmt.Fprintf(key, "import %q\n", pkg.PkgPath)
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// Compute the hashes of all files making up the package. As an
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// optimization, we use the build ID that Go already computed for us,
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// because it is virtually identical to hashing all CompiledGoFiles. It is
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// also sensitive to the Go version declared in go.mod.
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success := false
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if pkg.ExportFile != "" {
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id, err := getBuildid(pkg.ExportFile)
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if err == nil {
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if idx := strings.IndexRune(id, '/'); idx > -1 {
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fmt.Fprintf(key, "files %s\n", id[:idx])
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success = true
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}
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}
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}
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if !success {
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for _, f := range pkg.CompiledGoFiles {
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h, err := cache.FileHash(f)
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if err != nil {
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return cache.ActionID{}, err
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}
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fmt.Fprintf(key, "file %s %x\n", f, h)
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}
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if pkg.Module != nil && pkg.Module.GoMod != "" {
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// The go.mod file specifies the language version, which affects how
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// packages are analyzed.
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h, err := cache.FileHash(pkg.Module.GoMod)
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if err != nil {
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// TODO(dh): this doesn't work for tests because the go.mod file doesn't
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// exist on disk and is instead provided via an overlay. However, we're
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// unlikely to get here in the first place, as reading the build ID from
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// the export file is likely to succeed.
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return cache.ActionID{}, fmt.Errorf("couldn't hash go.mod: %w", err)
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} else {
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fmt.Fprintf(key, "file %s %x\n", pkg.Module.GoMod, h)
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}
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}
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}
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imps := make([]*PackageSpec, 0, len(pkg.Imports))
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for _, v := range pkg.Imports {
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imps = append(imps, v)
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}
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sort.Slice(imps, func(i, j int) bool {
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return imps[i].PkgPath < imps[j].PkgPath
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})
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for _, dep := range imps {
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if dep.ExportFile == "" {
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fmt.Fprintf(key, "import %s \n", dep.PkgPath)
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} else {
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id, err := getBuildid(dep.ExportFile)
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if err == nil {
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fmt.Fprintf(key, "import %s %s\n", dep.PkgPath, id)
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} else {
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fh, err := cache.FileHash(dep.ExportFile)
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if err != nil {
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return cache.ActionID{}, err
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}
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fmt.Fprintf(key, "import %s %x\n", dep.PkgPath, fh)
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}
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}
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}
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return key.Sum(), nil
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}
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var buildidCache = map[string]string{}
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func getBuildid(f string) (string, error) {
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if h, ok := buildidCache[f]; ok {
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return h, nil
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}
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h, err := buildid.ReadFile(f)
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if err != nil {
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return "", err
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}
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buildidCache[f] = h
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return h, nil
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}
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