X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/b6d7efab2c4bffa3fabd55b166e44cca8ac1391f..f3f37dd8d68c386d94904f10befdeef21201921a:/lib/cmd/cmd.go

diff --git a/lib/cmd/cmd.go b/lib/cmd/cmd.go
index 611c95d234..40e80f5eaa 100644
--- a/lib/cmd/cmd.go
+++ b/lib/cmd/cmd.go
@@ -2,7 +2,7 @@
 //
 // SPDX-License-Identifier: Apache-2.0
 
-// package cmd helps define reusable functions that can be exposed as
+// Package cmd helps define reusable functions that can be exposed as
 // [subcommands of] command line programs.
 package cmd
 
@@ -14,10 +14,15 @@ import (
 	"path/filepath"
 	"regexp"
 	"runtime"
+	"runtime/debug"
 	"sort"
 	"strings"
+
+	"github.com/sirupsen/logrus"
 )
 
+const EXIT_INVALIDARGUMENT = 2
+
 type Handler interface {
 	RunCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int
 }
@@ -33,7 +38,13 @@ func (f HandlerFunc) RunCommand(prog string, args []string, stdin io.Reader, std
 // 0.
 var Version versionCommand
 
-var version = "dev"
+var (
+	// These default version/commit strings should be set at build
+	// time: `go install -buildvcs=false -ldflags "-X
+	// git.arvados.org/arvados.git/lib/cmd.version=1.2.3"`
+	version = "dev"
+	commit  = "0000000000000000000000000000000000000000"
+)
 
 type versionCommand struct{}
 
@@ -41,6 +52,17 @@ func (versionCommand) String() string {
 	return fmt.Sprintf("%s (%s)", version, runtime.Version())
 }
 
+func (versionCommand) Commit() string {
+	if bi, ok := debug.ReadBuildInfo(); ok {
+		for _, bs := range bi.Settings {
+			if bs.Key == "vcs.revision" {
+				return bs.Value
+			}
+		}
+	}
+	return commit
+}
+
 func (versionCommand) RunCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
 	prog = regexp.MustCompile(` -*version$`).ReplaceAllLiteralString(prog, "")
 	fmt.Fprintf(stdout, "%s %s (%s)\n", prog, version, runtime.Version())
@@ -53,12 +75,12 @@ func (versionCommand) RunCommand(prog string, args []string, stdin io.Reader, st
 //
 // Example:
 //
-//     os.Exit(Multi(map[string]Handler{
-//             "foobar": HandlerFunc(func(prog string, args []string) int {
-//                     fmt.Println(args[0])
-//                     return 2
-//             }),
-//     })("/usr/bin/multi", []string{"foobar", "baz"}))
+//	os.Exit(Multi(map[string]Handler{
+//	        "foobar": HandlerFunc(func(prog string, args []string) int {
+//	                fmt.Println(args[0])
+//	                return 2
+//	        }),
+//	})("/usr/bin/multi", []string{"foobar", "baz"}, os.Stdin, os.Stdout, os.Stderr))
 //
 // ...prints "baz" and exits 2.
 type Multi map[string]Handler
@@ -84,13 +106,13 @@ func (m Multi) RunCommand(prog string, args []string, stdin io.Reader, stdout, s
 	} else if len(args) < 1 {
 		fmt.Fprintf(stderr, "usage: %s command [args]\n", prog)
 		m.Usage(stderr)
-		return 2
+		return EXIT_INVALIDARGUMENT
 	} else if cmd, ok = m[args[0]]; ok {
 		return cmd.RunCommand(prog+" "+args[0], args[1:], stdin, stdout, stderr)
 	} else {
 		fmt.Fprintf(stderr, "%s: unrecognized command %q\n", prog, args[0])
 		m.Usage(stderr)
-		return 2
+		return EXIT_INVALIDARGUMENT
 	}
 }
 
@@ -153,3 +175,9 @@ func SubcommandToFront(args []string, flagset FlagSet) []string {
 	copy(newargs[flagargs+1:], args[flagargs+1:])
 	return newargs
 }
+
+type NoPrefixFormatter struct{}
+
+func (NoPrefixFormatter) Format(entry *logrus.Entry) ([]byte, error) {
+	return []byte(entry.Message + "\n"), nil
+}