Remove hfsplus-tools dependency (#818913)

Mac boot images are optional. Don't require hfsplus-tools
by default, but warn the user that he needs to install them
if he wants to create mac boot images.

lorax.spec

@@ -23,7 +23,6 @@ Requires:       isomd5sum
 Requires:       glibc
 Requires:       util-linux
 Requires:       dosfstools
-Requires:       hfsplus-tools
 Requires:       genisoimage
 Requires:       parted
 Requires:       gzip

src/pylorax/__init__.py

@@ -134,6 +134,13 @@ class Lorax(BaseLoraxClass):
 
         assert self._configured
 
+        if domacboot:
+            try:
+                subprocess.check_call("rpm -q hfsplus-tools")
+            except subprocess.CalledProcessError:
+                logger.critical("you need to install hfsplus-tools to create mac images")
+                sys.exit(1)
+
         # set up work directory
         self.workdir = workdir or tempfile.mkdtemp(prefix="pylorax.work.")
         if not os.path.isdir(self.workdir):