[PATCHv1 1/1] git-p4: avoid crash adding symlinked directory

[Luke Diamand <luke@diamand.org>]

When submitting to P4, if git-p4 came across a symlinked
directory, then during the generation of the submit diff, it would
try to open it as a normal file and fail.

Spot this case, and instead output the target of the symlink in
the submit diff.

Add a test case.

Signed-off-by: Luke Diamand <luke@diamand.org>
---
 git-p4.py                     | 26 ++++++++++++++++++++------
 t/t9830-git-p4-symlink-dir.sh | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+), 6 deletions(-)
 create mode 100755 t/t9830-git-p4-symlink-dir.sh

diff --git a/git-p4.py b/git-p4.py
index fd5ca5246..d2f59bd91 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -25,6 +25,7 @@ import stat
 import zipfile
 import zlib
 import ctypes
+import errno
 
 try:
     from subprocess import CalledProcessError
@@ -1538,7 +1539,7 @@ class P4Submit(Command, P4UserMap):
             if response == 'n':
                 return False
 
-    def get_diff_description(self, editedFiles, filesToAdd):
+    def get_diff_description(self, editedFiles, filesToAdd, symlinks):
         # diff
         if os.environ.has_key("P4DIFF"):
             del(os.environ["P4DIFF"])
@@ -1553,10 +1554,17 @@ class P4Submit(Command, P4UserMap):
             newdiff += "==== new file ====\n"
             newdiff += "--- /dev/null\n"
             newdiff += "+++ %s\n" % newFile
-            f = open(newFile, "r")
-            for line in f.readlines():
-                newdiff += "+" + line
-            f.close()
+
+            try:
+                f = open(newFile, "r")
+                for line in f.readlines():
+                    newdiff += "+" + line
+                f.close()
+            except IOError as e:
+                if e.errno == errno.EISDIR and newFile in symlinks:
+                    newdiff += "+%s\n" % os.readlink(newFile)
+                else:
+                    raise
 
         return (diff + newdiff).replace('\r\n', '\n')
 
@@ -1574,6 +1582,7 @@ class P4Submit(Command, P4UserMap):
         filesToDelete = set()
         editedFiles = set()
         pureRenameCopy = set()
+        symlinks = set()
         filesToChangeExecBit = {}
 
         for line in diff:
@@ -1590,6 +1599,11 @@ class P4Submit(Command, P4UserMap):
                 filesToChangeExecBit[path] = diff['dst_mode']
                 if path in filesToDelete:
                     filesToDelete.remove(path)
+
+                dst_mode = int(diff['dst_mode'], 8)
+                if dst_mode == 0120000:
+                    symlinks.add(path)
+
             elif modifier == "D":
                 filesToDelete.add(path)
                 if path in filesToAdd:
@@ -1727,7 +1741,7 @@ class P4Submit(Command, P4UserMap):
         separatorLine = "######## everything below this line is just the diff #######\n"
         if not self.prepare_p4_only:
             submitTemplate += separatorLine
-            submitTemplate += self.get_diff_description(editedFiles, filesToAdd)
+            submitTemplate += self.get_diff_description(editedFiles, filesToAdd, symlinks)
 
         (handle, fileName) = tempfile.mkstemp()
         tmpFile = os.fdopen(handle, "w+b")
diff --git a/t/t9830-git-p4-symlink-dir.sh b/t/t9830-git-p4-symlink-dir.sh
new file mode 100755
index 000000000..3dc528bb1
--- /dev/null
+++ b/t/t9830-git-p4-symlink-dir.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+test_description='git p4 symlinked directories'
+
+. ./lib-git-p4.sh
+
+test_expect_success 'start p4d' '
+	start_p4d
+'
+
+test_expect_success 'symlinked directory' '
+	(
+		cd "$cli" &&
+		: >first_file.t &&
+		p4 add first_file.t &&
+		p4 submit -d "first change"
+	) &&
+	git p4 clone --dest "$git" //depot &&
+	(
+		cd "$git" &&
+		mkdir -p some/sub/directory &&
+		mkdir -p other/subdir2 &&
+		: > other/subdir2/file.t &&
+		(cd some/sub/directory && ln -s ../../../other/subdir2 .) &&
+		git add some other &&
+		git commit -m "symlinks" &&
+		git config git-p4.skipSubmitEdit true &&
+		git p4 submit -v
+	) &&
+	(
+		cd "$cli" &&
+		p4 sync &&
+		test -L some/sub/directory/subdir2
+		test_path_is_file some/sub/directory/subdir2/file.t
+	)
+
+'
+
+test_expect_success 'kill p4d' '
+	kill_p4d
+'
+
+test_done
-- 
2.11.0.274.g0ea315c