Simplify python launcher, use __main__.py

Uses more python rather than C++, and skips less of Py_Main.

Test: build/soong/python/tests/runtests.sh
Change-Id: I03997d88e2e16047c96bb4e00e530229c42b3325

cmd/merge_zips/merge_zips.go

@@ -66,7 +66,6 @@ var (
 	stripDirEntries  = flag.Bool("D", false, "strip directory entries from the output zip file")
 	manifest         = flag.String("m", "", "manifest file to insert in jar")
 	pyMain           = flag.String("pm", "", "__main__.py file to insert in par")
-	entrypoint       = flag.String("e", "", "par entrypoint file to insert in par")
 	prefix           = flag.String("prefix", "", "A file to prefix to the zip file")
 	ignoreDuplicates = flag.Bool("ignore-duplicates", false, "take each entry from the first zip it exists in and don't warn")
 )
@@ -79,7 +78,7 @@ func init() {
 
 func main() {
 	flag.Usage = func() {
-		fmt.Fprintln(os.Stderr, "usage: merge_zips [-jpsD] [-m manifest] [--prefix script] [-e entrypoint] [-pm __main__.py] output [inputs...]")
+		fmt.Fprintln(os.Stderr, "usage: merge_zips [-jpsD] [-m manifest] [--prefix script] [-pm __main__.py] output [inputs...]")
 		flag.PrintDefaults()
 	}
 
@@ -139,16 +138,12 @@ func main() {
 		log.Fatal(errors.New("must specify -j when specifying a manifest via -m"))
 	}
 
-	if *entrypoint != "" && !*emulatePar {
-		log.Fatal(errors.New("must specify -p when specifying a entrypoint via -e"))
-	}
-
 	if *pyMain != "" && !*emulatePar {
 		log.Fatal(errors.New("must specify -p when specifying a Python __main__.py via -pm"))
 	}
 
 	// do merge
-	err = mergeZips(readers, writer, *manifest, *entrypoint, *pyMain, *sortEntries, *emulateJar, *emulatePar,
+	err = mergeZips(readers, writer, *manifest, *pyMain, *sortEntries, *emulateJar, *emulatePar,
 		*stripDirEntries, *ignoreDuplicates, []string(stripFiles), []string(stripDirs), map[string]bool(zipsToNotStrip))
 	if err != nil {
 		log.Fatal(err)
@@ -249,7 +244,7 @@ type fileMapping struct {
 	source zipSource
 }
 
-func mergeZips(readers []namedZipReader, writer *zip.Writer, manifest, entrypoint, pyMain string,
+func mergeZips(readers []namedZipReader, writer *zip.Writer, manifest, pyMain string,
 	sortEntries, emulateJar, emulatePar, stripDirEntries, ignoreDuplicates bool,
 	stripFiles, stripDirs []string, zipsToNotStrip map[string]bool) error {
 
@@ -289,22 +284,6 @@ func mergeZips(readers []namedZipReader, writer *zip.Writer, manifest, entrypoin
 		addMapping(jar.ManifestFile, fileSource)
 	}
 
-	if entrypoint != "" {
-		buf, err := ioutil.ReadFile(entrypoint)
-		if err != nil {
-			return err
-		}
-		fh := &zip.FileHeader{
-			Name:               "entry_point.txt",
-			Method:             zip.Store,
-			UncompressedSize64: uint64(len(buf)),
-		}
-		fh.SetMode(0700)
-		fh.SetModTime(jar.DefaultTime)
-		fileSource := bufferEntry{fh, buf}
-		addMapping("entry_point.txt", fileSource)
-	}
-
 	if pyMain != "" {
 		buf, err := ioutil.ReadFile(pyMain)
 		if err != nil {

cmd/merge_zips/merge_zips_test.go

@@ -221,7 +221,7 @@ func TestMergeZips(t *testing.T) {
 			out := &bytes.Buffer{}
 			writer := zip.NewWriter(out)
 
-			err := mergeZips(readers, writer, "", "", "",
+			err := mergeZips(readers, writer, "", "",
 				test.sort, test.jar, false, test.stripDirEntries, test.ignoreDuplicates,
 				test.stripFiles, test.stripDirs, test.zipsToNotStrip)
 

python/builder.go

@@ -54,15 +54,14 @@ var (
 
 	embeddedPar = pctx.AndroidStaticRule("embeddedPar",
 		blueprint.RuleParams{
-			// `echo -n` to trim the newline, since the python code just wants the name.
-			// /bin/sh (used by ninja) on Mac turns off posix mode, and stops supporting -n.
-			// Explicitly use bash instead.
-			Command: `/bin/bash -c "echo -n '$main' > $entryPoint" &&` +
-				`$mergeParCmd -p --prefix $launcher -e $entryPoint $out $srcsZips && ` +
-				`chmod +x $out && (rm -f $entryPoint)`,
-			CommandDeps: []string{"$mergeParCmd"},
+			// `echo -n` to trim the newline, since the python code just wants the name
+			Command: `rm -f $out.main && ` +
+				`sed 's/ENTRY_POINT/$main/' build/soong/python/scripts/main.py >$out.main &&` +
+				`$mergeParCmd -p -pm $out.main --prefix $launcher $out $srcsZips && ` +
+				`chmod +x $out && rm -rf $out.main`,
+			CommandDeps: []string{"$mergeParCmd", "$parCmd", "build/soong/python/scripts/main.py"},
 		},
-		"main", "entryPoint", "srcsZips", "launcher")
+		"main", "srcsZips", "launcher")
 )
 
 func init() {
@@ -108,19 +107,15 @@ func registerBuildActionForParFile(ctx android.ModuleContext, embeddedLauncher b
 		// added launcherPath to the implicits Ninja dependencies.
 		implicits = append(implicits, launcherPath.Path())
 
-		// .intermediate output path for entry_point.txt
-		entryPoint := android.PathForModuleOut(ctx, entryPointFile).String()
-
 		ctx.Build(pctx, android.BuildParams{
 			Rule:        embeddedPar,
 			Description: "embedded python archive",
 			Output:      binFile,
 			Implicits:   implicits,
 			Args: map[string]string{
-				"main":       strings.Replace(strings.TrimSuffix(main, pyExt), "/", ".", -1),
-				"entryPoint": entryPoint,
-				"srcsZips":   strings.Join(srcsZips.Strings(), " "),
-				"launcher":   launcherPath.String(),
+				"main":     strings.Replace(strings.TrimSuffix(main, pyExt), "/", ".", -1),
+				"srcsZips": strings.Join(srcsZips.Strings(), " "),
+				"launcher": launcherPath.String(),
 			},
 		})
 	}

python/scripts/main.py

@@ -0,0 +1,12 @@
+import runpy
+import sys
+
+sys.argv[0] = __loader__.archive
+
+# Set sys.executable to None. The real executable is available as
+# sys.argv[0], and too many things assume sys.executable is a regular Python
+# binary, which isn't available. By setting it to None we get clear errors
+# when people try to use it.
+sys.executable = None
+
+runpy._run_module_as_main("ENTRY_POINT", alter_argv=False)