Fix AutoRoll+Bugdroid

autoroll/go/repo_manager/repo_manager.go

 package repo_manager
 
 import (
         "fmt"
         "os"
         "path"
         "regexp"
         "strconv"
         "strings"
         "sync"
         "time"
 
+        "github.com/skia-dev/glog"
+
         "go.skia.org/infra/go/autoroll"
         "go.skia.org/infra/go/exec"
         "go.skia.org/infra/go/gitinfo"
         "go.skia.org/infra/go/util"
 )
 
 const (
         DEPS_ROLL_BRANCH = "roll_branch"
 
         GCLIENT  = "gclient"
@@ skipping 275 matching lines @@
                 if err != nil {
                         return 0, fmt.Errorf("Failed to obtain commit details: %s", err)
                 }
                 b := util.BugsFromCommitMsg(d.Body)
                 for _, bug := range b[util.PROJECT_CHROMIUM] {
                         bugs = append(bugs, bug)
                 }
         }
 
         args := []string{r.childPath, r.childHead}
-        for _, bug := range bugs {
-                args = append(args, "--bug", bug)
+        if len(bugs) > 0 {
+                args = append(args, "--bug", strings.Join(bugs, ","))
         }
+        glog.Infof("Running command: roll-dep %s", strings.Join(args, " "))
         if _, err := exec.RunCommand(&exec.Command{
                 Dir:  r.chromiumDir,
                 Env:  []string{fmt.Sprintf("PATH=%s:%s", r.depot_tools, os.Getenv("PATH"))},
                 Name: r.rollDep,
-                Args: []string{r.childPath, r.childHead},
+                Args: args,
         }); err != nil {
                 return 0, err
         }
         // Build the commit message, starting with the message provided by roll-dep.
         commitMsg, err := exec.RunCwd(r.chromiumDir, "git", "log", "-n1", "--format=%B", "HEAD")
         if err != nil {
                 return 0, err
         }
         if cqExtraTrybots != "" {
                 commitMsg += "\n" + fmt.Sprintf(TMPL_CQ_INCLUDE_TRYBOTS, cqExtraTrybots)
@@ skipping 26 matching lines @@
         issues := ISSUE_CREATED_REGEX.FindStringSubmatch(uploadOutput)
         if len(issues) != 2 {
                 return 0, fmt.Errorf("Failed to find newly-uploaded issue number!")
         }
         return strconv.ParseInt(issues[1], 10, 64)
 }
 
 func (r *repoManager) User() string {
         return r.user
 }