Merge branch 'ls/p4-lfs' into HEAD

Recent update to Git LFS broke "git p4" by changing the output from
its "lfs pointer" subcommand.

* ls/p4-lfs:
  git-p4: fix Git LFS pointer parsing
  travis-ci: express Linux/OS X dependency versions more clearly
  travis-ci: update Git-LFS and P4 to the latest version

.travis.yml

@@ -22,8 +22,11 @@ addons:
 env:
   global:
     - DEVELOPER=1
-    - P4_VERSION="15.2"
-    - GIT_LFS_VERSION="1.1.0"
+    # The Linux build installs the defined dependency versions below.
+    # The OS X build installs the latest available versions. Keep that
+    # in mind when you encounter a broken OS X build!
+    - LINUX_P4_VERSION="16.1"
+    - LINUX_GIT_LFS_VERSION="1.2.0"
     - DEFAULT_TEST_TARGET=prove
     - GIT_PROVE_OPTS="--timer --jobs 3 --state=failed,slow,save"
     - GIT_TEST_OPTS="--verbose --tee"
@@ -38,17 +41,17 @@ before_install:
     linux)
       mkdir --parents custom/p4
       pushd custom/p4
-        wget --quiet http://filehost.perforce.com/perforce/r$P4_VERSION/bin.linux26x86_64/p4d
-        wget --quiet http://filehost.perforce.com/perforce/r$P4_VERSION/bin.linux26x86_64/p4
+        wget --quiet http://filehost.perforce.com/perforce/r$LINUX_P4_VERSION/bin.linux26x86_64/p4d
+        wget --quiet http://filehost.perforce.com/perforce/r$LINUX_P4_VERSION/bin.linux26x86_64/p4
         chmod u+x p4d
         chmod u+x p4
         export PATH="$(pwd):$PATH"
       popd
       mkdir --parents custom/git-lfs
       pushd custom/git-lfs
-        wget --quiet https://github.com/github/git-lfs/releases/download/v$GIT_LFS_VERSION/git-lfs-linux-amd64-$GIT_LFS_VERSION.tar.gz
-        tar --extract --gunzip --file "git-lfs-linux-amd64-$GIT_LFS_VERSION.tar.gz"
-        cp git-lfs-$GIT_LFS_VERSION/git-lfs .
+        wget --quiet https://github.com/github/git-lfs/releases/download/v$LINUX_GIT_LFS_VERSION/git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz
+        tar --extract --gunzip --file "git-lfs-linux-amd64-$LINUX_GIT_LFS_VERSION.tar.gz"
+        cp git-lfs-$LINUX_GIT_LFS_VERSION/git-lfs .
         export PATH="$(pwd):$PATH"
       popd
       ;;

git-p4.py

@@ -1064,8 +1064,15 @@ class GitLFS(LargeFileSystem):
         if pointerProcess.wait():
             os.remove(contentFile)
             die('git-lfs pointer command failed. Did you install the extension?')
-        pointerContents = [i+'\n' for i in pointerFile.split('\n')[2:][:-1]]
-        oid = pointerContents[1].split(' ')[1].split(':')[1][:-1]
+
+        # Git LFS removed the preamble in the output of the 'pointer' command
+        # starting from version 1.2.0. Check for the preamble here to support
+        # earlier versions.
+        # c.f. https://github.com/github/git-lfs/commit/da2935d9a739592bc775c98d8ef4df9c72ea3b43
+        if pointerFile.startswith('Git LFS pointer for'):
+            pointerFile = re.sub(r'Git LFS pointer for.*\n\n', '', pointerFile)
+
+        oid = re.search(r'^oid \w+:(\w+)', pointerFile, re.MULTILINE).group(1)
         localLargeFile = os.path.join(
             os.getcwd(),
             '.git', 'lfs', 'objects', oid[:2], oid[2:4],
@@ -1073,7 +1080,7 @@ class GitLFS(LargeFileSystem):
         )
         # LFS Spec states that pointer files should not have the executable bit set.
         gitMode = '100644'
-        return (gitMode, pointerContents, localLargeFile)
+        return (gitMode, pointerFile, localLargeFile)
 
     def pushFile(self, localLargeFile):
         uploadProcess = subprocess.Popen(

t/t9824-git-p4-git-lfs.sh

@@ -13,6 +13,10 @@ test_file_in_lfs () {
 	FILE="$1" &&
 	SIZE="$2" &&
 	EXPECTED_CONTENT="$3" &&
+	sed -n '1,1 p' "$FILE" | grep "^version " &&
+	sed -n '2,2 p' "$FILE" | grep "^oid " &&
+	sed -n '3,3 p' "$FILE" | grep "^size " &&
+	test_line_count = 3 "$FILE" &&
 	cat "$FILE" | grep "size $SIZE" &&
 	HASH=$(cat "$FILE" | grep "oid sha256:" | sed -e "s/oid sha256://g") &&
 	LFS_FILE=".git/lfs/objects/$(echo "$HASH" | cut -c1-2)/$(echo "$HASH" | cut -c3-4)/$HASH" &&