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|
package main
import (
"bufio"
"fmt"
"log"
"os"
"path"
"path/filepath"
"regexp"
"strings"
)
const (
PYFILE_NOT_BYTECOMPILED_TAG = "py-file-not-bytecompiled"
PYSHARED_FILE_NOT_BYTECOMPILED_TAG = "pyshared-file-not-bytecompiled" // obsolete, kept for backwards compat
)
type pyfileErr struct {
pkg string
path string
}
func (c pyfileErr) Error() string {
if c == (pyfileErr{}) {
return ""
}
return fmt.Sprintf("%s: %s %s", c.pkg, PYFILE_NOT_BYTECOMPILED_TAG, c.path)
}
type pyfileChecker struct {
emit bool
}
func newPyfileChecker(tags tagFilter) pyfileChecker {
return pyfileChecker{
emit: tags.shouldEmit(PYFILE_NOT_BYTECOMPILED_TAG),
}
}
func (cc pyfileChecker) check(pkg2files map[string][]string) []error {
if !cc.emit {
return nil
}
nopy3 := len(py3versions()) == 0
pypyInstalled := pathExists("/usr/bin/pypy")
nonSheBangPath := regexp.MustCompile("/usr/lib/python[0-9](?:[.][0-9]+)?(?:config-)")
var tags []error
for pkg, files := range pkg2files {
for _, f := range files {
if !strings.HasSuffix(f, ".py") ||
byteCompilationNotNeeded.MatchString(f) ||
!pathExists(f) ||
pathExists(f+"c") ||
// Don't expect third-party Python 3.X modules to be
// byte-compiled if no supported Python 3.X version is
// installed:
(strings.HasPrefix(f, "/usr/lib/python3/dist-packages/") && nopy3) {
continue
}
// Check for PEP-3147 *.pyc repository directories.
impl := "cpython"
if strings.HasPrefix(f, "/usr/lib/pypy/") {
if !pypyInstalled {
continue
}
impl = "pypy"
}
basename := strings.TrimSuffix(path.Base(f), ".py")
g := fmt.Sprintf("%s/__pycache__/%s.%s-*.pyc", path.Dir(f), basename, impl)
matches, err := filepath.Glob(g)
if err != nil {
log.Fatalf("Constructed bad glob pattern %q", g)
}
if len(matches) > 0 {
continue
}
isExec, err := isExecutable(f)
if err != nil {
log.Fatalf("Failed to stat %q: %v", f, err)
}
if !nonSheBangPath.MatchString(f) && isExec && hasSheBang(f) {
continue
}
tags = append(tags, pyfileErr{
pkg: pkg,
path: f,
})
}
}
return tags
}
func py3versions() []string {
const defaultsFile = "/usr/share/python3/debian_defaults"
if !pathExists(defaultsFile) {
return nil
}
buf, err := os.ReadFile(defaultsFile)
if err != nil {
log.Fatalf("Failed to read %q: %v\n", defaultsFile, err)
}
const fieldName = "supported-versions"
for {
advance, line, err := bufio.ScanLines(buf, true)
switch {
case err != nil:
log.Fatalf("Failed to scan %q: %v\n", defaultsFile, err)
case advance == 0:
return nil // we got to EoF
case advance <= len(buf):
buf = buf[advance:]
}
// Sample line we're after:
// supported-versions = python3.11, python3.12, ...
stripped := strings.Replace(string(line), " ", "", -1)
if !strings.HasPrefix(stripped, fieldName+"=") {
continue
}
return strings.Split(
strings.Replace(
stripped[len(fieldName)+1:], "python", "", -1),
",")
}
}
// hasSheBang returns true if any of the following is true:
// - f's first bytes match "#! ?/"
// - f is less than 4 bytes long
// - we have no permission to read it
//
// Calls log.Fatalf() on non-permission errors.
func hasSheBang(f string) bool {
fi, err := os.Open(f)
if err != nil {
if os.IsPermission(err) {
return true
}
log.Fatal("Open: ", err)
}
defer fi.Close()
head := make([]byte, 4)
n, err := fi.Read(head)
if err != nil {
log.Fatal("Read: ", err)
}
return (n < 4 || (head[0] == '#' && head[1] == '!' &&
((head[2] == ' ' && head[3] == '/') ||
head[2] == '/')))
}
var (
pyfileExemptPaths = strings.Split(`
/etc/
|/bin/
|/sbin/
|/usr/bin/
|/usr/games/
|/usr/lib/debug/bin/
|/usr/lib/debug/sbin/
|/usr/lib/debug/usr/bin/
|/usr/lib/debug/usr/games/
|/usr/lib/debug/usr/sbin/
|/usr/lib/pypy/lib-python/\d[.]\d+/test/bad
|/usr/lib/pypy/lib-python/\d[.]\d+/lib2to3/tests/data/
|/usr/sbin/
|/usr/share/apport/package-hooks/
|/usr/share/doc/
|/usr/share/jython/
|/usr/share/paster_templates/
|/usr/lib/python\d[.]\d+/__phello__[.]foo[.]py$
|/usr/lib/python\d[.]\d+/lib2to3/tests/data/
|/usr/lib/python\d[.]\d+/test/bad`, "\n")[1:]
byteCompilationNotNeeded = regexp.MustCompile(strings.Join(pyfileExemptPaths, ""))
)
|
