Add -quiet option in soong_zip

The quiet option prevents warnings from being printed to the console.

Test: m soong_zip
Bug: 300166930
Change-Id: I4c2c5f16c45c2874a2a2cbb1e3f397124043e472

zip/cmd/main.go

@@ -174,6 +174,7 @@ func main() {
 	traceFile := flags.String("trace", "", "write trace to file")
 	sha256Checksum := flags.Bool("sha256", false, "add a zip header to each file containing its SHA256 digest")
 	doNotWrite := flags.Bool("n", false, "Nothing is written to disk -- all other work happens")
+	quiet := flags.Bool("quiet", false, "do not print warnings to console")
 
 	flags.Var(&rootPrefix{}, "P", "path prefix within the zip at which to place files")
 	flags.Var(&listFiles{}, "l", "file containing list of files to zip")
@@ -238,6 +239,7 @@ func main() {
 		IgnoreMissingFiles:       *ignoreMissingFiles,
 		Sha256Checksum:           *sha256Checksum,
 		DoNotWrite:               *doNotWrite,
+		Quiet:                    *quiet,
 	})
 	if err != nil {
 		fmt.Fprintln(os.Stderr, "error:", err.Error())

zip/zip.go

@@ -283,6 +283,7 @@ type ZipArgs struct {
 	IgnoreMissingFiles       bool
 	Sha256Checksum           bool
 	DoNotWrite               bool
+	Quiet                    bool
 
 	Stderr     io.Writer
 	Filesystem pathtools.FileSystem
@@ -340,7 +341,9 @@ func zipTo(args ZipArgs, w io.Writer) error {
 					Err:  os.ErrNotExist,
 				}
 				if args.IgnoreMissingFiles {
+					if !args.Quiet {
 						fmt.Fprintln(z.stderr, "warning:", err)
+					}
 				} else {
 					return err
 				}
@@ -357,7 +360,9 @@ func zipTo(args ZipArgs, w io.Writer) error {
 					Err:  os.ErrNotExist,
 				}
 				if args.IgnoreMissingFiles {
+					if !args.Quiet {
 						fmt.Fprintln(z.stderr, "warning:", err)
+					}
 				} else {
 					return err
 				}
@@ -368,7 +373,9 @@ func zipTo(args ZipArgs, w io.Writer) error {
 					Err:  syscall.ENOTDIR,
 				}
 				if args.IgnoreMissingFiles {
+					if !args.Quiet {
 						fmt.Fprintln(z.stderr, "warning:", err)
+					}
 				} else {
 					return err
 				}