use /var/tmp instead of /tmp

Also add a --tmp option so users can specify a top level tmp dir.

src/pylorax/treebuilder.py

@@ -146,7 +146,7 @@ class RuntimeBuilder(object):
             runcmd(["depmod", "-a", "-F", ksyms, "-b", root, kver])
             generate_module_info(moddir+kver, outfile=moddir+"module-info")
 
-    def create_runtime(self, outfile="/tmp/squashfs.img", compression="xz", compressargs=[], size=1):
+    def create_runtime(self, outfile="/var/tmp/squashfs.img", compression="xz", compressargs=[], size=1):
         # make live rootfs image - must be named "LiveOS/rootfs.img" for dracut
         workdir = joinpaths(os.path.dirname(outfile), "runtime-workdir")
         if size:

src/sbin/lorax

@@ -109,6 +109,8 @@ def main(args):
             action="store_false", default=True, dest="domacboot")
     optional.add_option("--logfile", default="./lorax.log",
             help="Path to logfile")
+    optional.add_option("--tmp", default="/var/tmp",
+            help="Top level temporary directory" )
 
     # add the option groups to the parser
     parser.add_option_group(required)
@@ -142,6 +144,8 @@ def main(args):
 
     setup_logging(opts)
 
+    tempfile.tempdir = opts.tmp
+
     # create the temporary directory for lorax
     tempdir = tempfile.mkdtemp(prefix="lorax.", dir=tempfile.gettempdir())
 
@@ -169,7 +173,7 @@ def main(args):
 
 
 def get_yum_base_object(installroot, repositories, mirrorlists=[],
-                        tempdir="/tmp", proxy=None, excludepkgs=[]):
+                        tempdir="/var/tmp", proxy=None, excludepkgs=[]):
 
     def sanitize_repo(repo):
         if repo.startswith("/"):