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// Copyright 2022 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 main
import (
"errors"
"fmt"
"os"
"strings"
"golang.org/x/tools/go/packages"
"golang.org/x/vuln/vulncheck"
)
var (
// errGoVersionMismatch is used to indicate that there is a mismatch between
// the Go version used to build govulncheck and the one currently on PATH.
errGoVersionMismatch = errors.New(`Loading packages failed, possibly due to a mismatch between the Go version
used to build govulncheck and the Go version on PATH. Consider rebuilding
govulncheck with the current Go version.`)
// errNoGoSum indicates that a go.mod file was not found in this module.
errNoGoMod = errors.New(`no go.mod file
govulncheck only works Go with modules. Try navigating to your module directory.
Otherwise, run go mod init to make your project a module.
See https://go.dev/doc/modules/managing-dependencies for more information.`)
)
// packageError contains errors from loading a set of packages.
type packageError struct {
Errors []packages.Error
}
func (e *packageError) Error() string {
var b strings.Builder
fmt.Fprintln(&b, "Packages contain errors:")
for _, e := range e.Errors {
fmt.Fprintln(&b, e)
}
return b.String()
}
// fileExists checks if file path exists. Returns true
// if the file exists or it cannot prove that it does
// not exist. Otherwise, returns false.
func fileExists(path string) bool {
if _, err := os.Stat(path); err == nil {
return true
} else if errors.Is(err, os.ErrNotExist) {
return false
}
// Conservatively return true if os.Stat fails
// for some other reason.
return true
}
// isGoVersionMismatchError checks if err is due to mismatch between
// the Go version used to build govulncheck and the one currently
// on PATH.
func isGoVersionMismatchError(err error) bool {
msg := err.Error()
// See golang.org/x/tools/go/packages/packages.go.
return strings.Contains(msg, "This application uses version go") &&
strings.Contains(msg, "It may fail to process source files")
}
// inGoPathMode checks if govulncheck is running in GOPATH mode by checking
// if module information is available.
func inGoPathMode(pkgs []*vulncheck.Package) bool {
packageModule := func(p *vulncheck.Package) *vulncheck.Module {
m := p.Module
if m == nil {
return nil
}
if r := m.Replace; r != nil {
return r
}
return m
}
hasModuleInfo := false
var visit func(p *vulncheck.Package)
visit = func(p *vulncheck.Package) {
if packageModule(p) != nil {
hasModuleInfo = true
return
}
for _, i := range p.Imports {
visit(i)
}
}
for _, p := range pkgs {
visit(p)
}
return !hasModuleInfo
}
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