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// This file is part of the adequate Debian-native package, and is available
// under the Expat license. For the full terms please see debian/copyright.
package main
import (
"fmt"
"log"
"os"
"sort"
"strings"
)
const (
BROKEN_BINFMT_DETECTOR_TAG = "broken-binfmt-detector"
BROKEN_BINFMT_INTERPRETER_TAG = "broken-binfmt-interpreter"
)
type binfmtErr struct {
tag string
pkg string
name string
interpreter string
detector string
err error
}
func (c binfmtErr) Error() string {
if c == (binfmtErr{}) {
return ""
}
var p string
switch c.tag {
case BROKEN_BINFMT_INTERPRETER_TAG:
p = c.interpreter
case BROKEN_BINFMT_DETECTOR_TAG:
p = c.detector
default:
log.Fatalf("Unexpected binfmtErr tag value: %q", c.tag)
}
return fmt.Sprintf("%s: %s %s => %s (%s)", c.pkg, c.tag, c.name, p, c.err)
}
type notExecutableErr struct{}
func (ne notExecutableErr) Error() string {
return "not executable"
}
type binfmtChecker struct {
emitInterpreterTags bool
emitDetectorTags bool
displayBinfmts runCommandType
}
func newBinfmtChecker(tags tagFilter) binfmtChecker {
return binfmtChecker{
emitInterpreterTags: tags.shouldEmit(BROKEN_BINFMT_INTERPRETER_TAG),
emitDetectorTags: tags.shouldEmit(BROKEN_BINFMT_DETECTOR_TAG),
displayBinfmts: runCommand,
}
}
func (cc binfmtChecker) check(pkg2files map[string][]string) []error {
if !cc.emitInterpreterTags && !cc.emitDetectorTags {
return nil
}
pkgs := make(map[string]bool)
for pkg := range pkg2files {
p := strings.Split(pkg, ":")[0]
pkgs[p] = true
}
formats := cc.binfmtFormats()
var tags []error
for _, fmt := range formats {
if cc.emitInterpreterTags {
if fmt.name == "" || fmt.interpreter == "" || fmt.pkg == "" || !pkgs[fmt.pkg] {
continue
}
err := os.ErrNotExist
if pathExists(fmt.interpreter) {
var isExec bool
if isExec, err = isExecutable(fmt.interpreter); err == nil && isExec {
continue
}
if err == nil {
err = notExecutableErr{}
}
}
tags = append(tags, binfmtErr{
tag: BROKEN_BINFMT_INTERPRETER_TAG,
pkg: fmt.pkg,
name: fmt.name,
interpreter: fmt.interpreter,
err: err,
})
}
if cc.emitDetectorTags {
if fmt.detector == "" {
continue
}
err := os.ErrNotExist
if pathExists(fmt.detector) {
var isExec bool
if isExec, err = isExecutable(fmt.detector); err == nil && isExec {
continue
}
if err == nil {
err = notExecutableErr{}
}
}
tags = append(tags, binfmtErr{
tag: BROKEN_BINFMT_DETECTOR_TAG,
pkg: fmt.pkg,
name: fmt.name,
detector: fmt.detector,
err: err,
})
}
}
return tags
}
type format struct {
name string
interpreter string
detector string
pkg string
}
func (cc binfmtChecker) binfmtFormats() []format {
const updateBinfmts = "/usr/sbin/update-binfmts"
if isExec, err := isExecutable(updateBinfmts); err != nil || !isExec {
return nil
}
dispCmd := []string{updateBinfmts, "--display"}
lines, err := cc.displayBinfmts(dispCmd)
if err != nil {
log.Fatalf(err.Error())
}
formats := make(map[string]format)
var name string
errMsgTempl := fmt.Sprintf("Unexpected output from %s: %%q", strings.Join(dispCmd, " "))
// sample input:
// python3.11 (enabled):
// package = python3.11
// type = magic
// offset = 0
// magic = \xa7\x0d\x0d\x0a
// mask =
// interpreter = /usr/bin/python3.11
// detector =
for _, line := range lines {
fields := strings.Fields(line)
switch n := len(fields); {
case n == 0:
continue
case n == 2 && strings.HasSuffix(fields[1], ":"):
name = fields[0]
if formats[name].name != "" {
log.Fatalf(errMsgTempl, line)
}
formats[name] = format{name: name}
continue
case n == 3 && fields[1] == "=":
key := fields[0]
value := fields[2]
if value == "" {
continue
}
f := formats[name]
if name == "" || key == "" || f.name == "" ||
(key == "package" && f.pkg != "") ||
(key == "interpreter" && f.interpreter != "") ||
(key == "detector" && f.detector != "") {
log.Fatalf(errMsgTempl, line)
}
switch key {
case "interpreter":
f.interpreter = value
case "detector":
f.detector = value
case "package":
f.pkg = value
default:
continue
}
formats[name] = f
continue
}
}
var fmts []format
for _, f := range formats {
fmts = append(fmts, f)
}
sort.Slice(fmts, func(a, b int) bool { return fmts[a].name < fmts[b].name })
return fmts
}
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