Merge branch 'ld/p4-import-labels' into maint

Correct "git p4 --detect-labels" so that it does not fail to create
a tag that points at a commit that is also being imported.

* ld/p4-import-labels:
  git-p4: fix P4 label import for unprocessed commits
  git-p4: do not terminate creating tag for unknown commit
  git-p4: failing test for ignoring invalid p4 labels

git-p4.py

@@ -2329,8 +2329,11 @@ def make_email(self, userid):
         else:
             return "%s <a@b>" % userid
 
-    # Stream a p4 tag
     def streamTag(self, gitStream, labelName, labelDetails, commit, epoch):
+        """ Stream a p4 tag.
+        commit is either a git commit, or a fast-import mark, ":<p4commit>"
+        """
+
         if verbose:
             print "writing tag %s for commit %s" % (labelName, commit)
         gitStream.write("tag %s\n" % labelName)
@@ -2381,7 +2384,7 @@ def commit(self, details, files, branch, parent = ""):
             self.clientSpecDirs.update_client_spec_path_cache(files)
 
         self.gitStream.write("commit %s\n" % branch)
-#        gitStream.write("mark :%s\n" % details["change"])
+        self.gitStream.write("mark :%s\n" % details["change"])
         self.committedChanges.add(int(details["change"]))
         committer = ""
         if author not in self.users:
@@ -2500,13 +2503,19 @@ def importP4Labels(self, stream, p4Labels):
             if change.has_key('change'):
                 # find the corresponding git commit; take the oldest commit
                 changelist = int(change['change'])
-                gitCommit = read_pipe(["git", "rev-list", "--max-count=1",
-                     "--reverse", ":/\[git-p4:.*change = %d\]" % changelist])
-                if len(gitCommit) == 0:
-                    print "could not find git commit for changelist %d" % changelist
-                else:
-                    gitCommit = gitCommit.strip()
+                if changelist in self.committedChanges:
+                    gitCommit = ":%d" % changelist       # use a fast-import mark
                     commitFound = True
+                else:
+                    gitCommit = read_pipe(["git", "rev-list", "--max-count=1",
+                        "--reverse", ":/\[git-p4:.*change = %d\]" % changelist], ignore_error=True)
+                    if len(gitCommit) == 0:
+                        print "importing label %s: could not find git commit for changelist %d" % (name, changelist)
+                    else:
+                        commitFound = True
+                        gitCommit = gitCommit.strip()
+
+                if commitFound:
                     # Convert from p4 time format
                     try:
                         tmwhen = time.strptime(labelDetails['Update'], "%Y/%m/%d %H:%M:%S")

t/t9811-git-p4-label-import.sh

@@ -214,6 +214,51 @@ test_expect_success 'use git config to enable import/export of tags' '
 	)
 '
 
+p4_head_revision() {
+	p4 changes -m 1 "$@" | awk '{print $2}'
+}
+
+# Importing a label that references a P4 commit that
+# has not been seen. The presence of a label on a commit
+# we haven't seen should not cause git-p4 to fail. It should
+# merely skip that label, and still import other labels.
+test_expect_success 'importing labels with missing revisions' '
+	test_when_finished cleanup_git &&
+	(
+		rm -fr "$cli" "$git" &&
+		mkdir "$cli" &&
+		P4CLIENT=missing-revision &&
+		client_view "//depot/missing-revision/... //missing-revision/..." &&
+		cd "$cli" &&
+		>f1 && p4 add f1 && p4 submit -d "start" &&
+
+		p4 tag -l TAG_S0 ... &&
+
+		>f2 && p4 add f2 && p4 submit -d "second" &&
+
+		startrev=$(p4_head_revision //depot/missing-revision/...) &&
+
+		>f3 && p4 add f3 && p4 submit -d "third" &&
+
+		p4 edit f2 && date >f2 && p4 submit -d "change" f2 &&
+
+		endrev=$(p4_head_revision //depot/missing-revision/...) &&
+
+		p4 tag -l TAG_S1 ... &&
+
+		# we should skip TAG_S0 since it is before our startpoint,
+		# but pick up TAG_S1.
+
+		git p4 clone --dest="$git" --import-labels -v \
+			//depot/missing-revision/...@$startrev,$endrev &&
+		(
+			cd "$git" &&
+			git rev-parse TAG_S1 &&
+			! git rev-parse TAG_S0
+		)
+	)
+'
+
 
 test_expect_success 'kill p4d' '
 	kill_p4d