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