Revert "exec plugin: allow using glob pattern in command list"

This reverts commit 6381efa7ce.

plugins/inputs/exec/exec.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"fmt"
 	"os/exec"
-	"path/filepath"
 	"sync"
 	"syscall"
 	"time"
@@ -19,11 +18,8 @@ import (
 )
 
 const sampleConfig = `
-  ## Full path to executable with parameters,
-  ## or a glob pattern to run all matching files.
-  ## the glob pattern will be run at every interval, so new files will
-  ## automatically be picked up.
-  commands = ["/tmp/test.sh", "/usr/bin/collector --foo=bar", "/tmp/collect_*.sh"]
+  ## Commands array
+  commands = ["/tmp/test.sh", "/usr/bin/mycollector --foo=bar"]
 
   ## Timeout for each command to complete.
   timeout = "5s"
@@ -154,19 +150,10 @@ func (e *Exec) Gather(acc telegraf.Accumulator) error {
 		e.Command = ""
 	}
 
-	commands := make([]string, len(e.Commands))
-	for _, pattern := range e.Commands {
-		matches, err := filepath.Glob(pattern)
-		if err != nil {
-			return err
-		}
-		commands = append(commands, matches...)
-	}
+	e.errChan = make(chan error, len(e.Commands))
 
-	e.errChan = make(chan error, len(commands))
-
-	e.wg.Add(len(commands))
-	for _, command := range commands {
+	e.wg.Add(len(e.Commands))
+	for _, command := range e.Commands {
 		go e.ProcessCommand(command, acc)
 	}
 	e.wg.Wait()