exec: full argument logging

context.go

@@ -9,9 +9,9 @@ import (
 
 	"github.com/rsteube/carapace/internal/env"
 	"github.com/rsteube/carapace/internal/shell/zsh"
+	"github.com/rsteube/carapace/pkg/execlog"
 	"github.com/rsteube/carapace/pkg/util"
 	"github.com/rsteube/carapace/third_party/github.com/drone/envsubst"
-	"github.com/rsteube/carapace/third_party/golang.org/x/sys/execabs"
 	"github.com/spf13/cobra"
 )
 
@@ -88,16 +88,16 @@ func (c Context) Envsubst(s string) (string, error) {
 // Command returns the Cmd struct to execute the named program with the given arguments.
 // Env and Dir are set using the Context.
 // See exec.Command for most details.
-func (c Context) Command(name string, arg ...string) *execabs.Cmd {
+func (c Context) Command(name string, arg ...string) *execlog.Cmd {
 	if c.mockedReplies != nil {
 		if m, err := json.Marshal(append([]string{name}, arg...)); err == nil {
 			if reply, exists := c.mockedReplies[string(m)]; exists {
-				return execabs.Command("echo", reply)
+				return execlog.Command("echo", reply) // TODO use mock
 			}
 		}
 	}
 
-	cmd := execabs.Command(name, arg...)
+	cmd := execlog.Command(name, arg...)
 	cmd.Env = c.Env
 	cmd.Dir = c.Dir
 	return cmd

defaultActions.go

@@ -66,7 +66,6 @@ func ActionExecCommandE(name string, arg ...string) func(f func(output []byte, e
 			cmd := c.Command(name, arg...)
 			cmd.Stdout = &stdout
 			cmd.Stderr = &stderr
-			LOG.Printf("executing %#v", cmd.String())
 			if err := cmd.Run(); err != nil {
 				if exitErr, ok := err.(*exec.ExitError); ok {
 					exitErr.Stderr = stderr.Bytes() // seems this needs to be set manually due to stdout being collected?

internal/log/log.go

@@ -0,0 +1,32 @@
+package log
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+
+	"github.com/rsteube/carapace/internal/env"
+	"github.com/rsteube/carapace/internal/uid"
+	"github.com/rsteube/carapace/pkg/ps"
+)
+
+var LOG = log.New(ioutil.Discard, "", log.Flags())
+
+func init() {
+	if !env.Log() {
+		return
+	}
+
+	tmpdir := fmt.Sprintf("%v/carapace", os.TempDir())
+	if err := os.MkdirAll(tmpdir, os.ModePerm); err != nil {
+		log.Fatal(err.Error())
+	}
+
+	file := fmt.Sprintf("%v/%v.log", tmpdir, uid.Executable())
+	if logfileWriter, err := os.OpenFile(file, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o666); err != nil {
+		log.Fatal(err.Error())
+	} else {
+		LOG = log.New(logfileWriter, ps.DetermineShell()+" ", log.Flags()|log.Lmsgprefix|log.Lmicroseconds)
+	}
+}

log.go

@@ -1,32 +1,5 @@
 package carapace
 
-import (
-	"fmt"
-	"io/ioutil"
-	"log"
-	"os"
+import "github.com/rsteube/carapace/internal/log"
 
-	"github.com/rsteube/carapace/internal/env"
-	"github.com/rsteube/carapace/internal/uid"
-	"github.com/rsteube/carapace/pkg/ps"
-)
-
-var LOG = log.New(ioutil.Discard, "", log.Flags())
-
-func init() {
-	if !env.Log() {
-		return
-	}
-
-	tmpdir := fmt.Sprintf("%v/carapace", os.TempDir())
-	if err := os.MkdirAll(tmpdir, os.ModePerm); err != nil {
-		log.Fatal(err.Error())
-	}
-
-	file := fmt.Sprintf("%v/%v.log", tmpdir, uid.Executable())
-	if logfileWriter, err := os.OpenFile(file, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o666); err != nil {
-		log.Fatal(err.Error())
-	} else {
-		LOG = log.New(logfileWriter, ps.DetermineShell()+" ", log.Flags()|log.Lmsgprefix|log.Lmicroseconds)
-	}
-}
+var LOG = log.LOG

pkg/execlog/execlog.go

@@ -0,0 +1,34 @@
+package execlog
+
+import (
+	"github.com/rsteube/carapace/internal/log"
+	"github.com/rsteube/carapace/pkg/util"
+	"github.com/rsteube/carapace/third_party/golang.org/x/sys/execabs"
+)
+
+type Cmd struct {
+	*execabs.Cmd
+}
+
+// Command is like execabs.Command but logs args on execution.
+func Command(name string, arg ...string) *Cmd {
+	cmd := &Cmd{
+		execabs.Command(name, arg...),
+	}
+	return cmd
+}
+
+func (c *Cmd) Run() error {
+	log.LOG.Printf("executing %#v", util.FormatCmd(c.Args...))
+	return c.Cmd.Run()
+}
+
+func (c *Cmd) Start() error {
+	log.LOG.Printf("executing %#v", util.FormatCmd(c.Args...))
+	return c.Cmd.Start()
+}
+
+// Command is the same as execabs.Command.
+func LookPath(file string) (string, error) {
+	return execabs.LookPath(file)
+}

pkg/util/format.go

@@ -0,0 +1,27 @@
+package util
+
+import (
+	"fmt"
+	"strings"
+)
+
+// FormatCmd joins given args to a formatted command.
+// TODO experimental
+func FormatCmd(args ...string) string {
+	replacer := strings.NewReplacer(
+		"$", "\\$",
+		"`", "\\`",
+	)
+
+	formatted := make([]string, 0, len(args))
+	for _, arg := range args {
+		switch {
+		case arg == "",
+			strings.ContainsAny(arg, `"' `+"\n\r\t"):
+			formatted = append(formatted, replacer.Replace(fmt.Sprintf("%#v", arg)))
+		default:
+			formatted = append(formatted, arg)
+		}
+	}
+	return strings.Join(formatted, " ")
+}