FIX: Check and report mount table parsing failures

nipype/utils/filemanip.py

@@ -185,7 +185,8 @@ def fname_presuffix(fname, prefix='', suffix='', newpath=None, use_ext=True):
     '/tmp/prefoopost.nii.gz'
 
     >>> from nipype.interfaces.base import Undefined
-    >>> fname_presuffix(fname, 'pre', 'post', Undefined) == fname_presuffix(fname, 'pre', 'post')
+    >>> fname_presuffix(fname, 'pre', 'post', Undefined) == \
+            fname_presuffix(fname, 'pre', 'post')
     True
 
     """
@@ -289,15 +290,25 @@ def _parse_mount_table(exit_code, output):
     #                          <PATH>^^^^      ^^^^^<FSTYPE>
     # OSX mount example:    /dev/disk2 on / (hfs, local, journaled)
     #                               <PATH>^  ^^^<FSTYPE>
-    pattern = re.compile(r'.*? on (/.*?) (?:type |\()([^\s,]+)(?:, |\)| )')
+    pattern = re.compile(r'.*? on (/.*?) (?:type |\()([^\s,\)]+)')
+
+    # Keep line and match for error reporting (match == None on failure)
+    # Ignore empty lines
+    matches = [(l, pattern.match(l))
+               for l in output.strip().splitlines() if l]
 
     # (path, fstype) tuples, sorted by path length (longest first)
-    mount_info = sorted((pattern.match(l).groups()
-                         for l in output.splitlines()),
+    mount_info = sorted((match.groups() for _, match in matches
+                         if match is not None),
                         key=lambda x: len(x[0]), reverse=True)
     cifs_paths = [path for path, fstype in mount_info
                   if fstype.lower() == 'cifs']
 
+    # Report failures as warnings
+    for line, match in matches:
+        if match is None:
+            fmlogger.debug("Cannot parse mount line: '%s'", line)
+
     return [
         mount for mount in mount_info
         if any(mount[0].startswith(path) for path in cifs_paths)

nipype/utils/tests/test_filemanip.py

@@ -451,7 +451,16 @@ def test_related_files(file, length, expected_files):
 tmpfs on /proc/sched_debug type tmpfs (rw,nosuid,size=65536k,mode=755)
 tmpfs on /proc/scsi type tmpfs (ro,relatime)
 tmpfs on /sys/firmware type tmpfs (ro,relatime)
-''', 0, [('/data', 'cifs')])
+''', 0, [('/data', 'cifs')]),
+# From @yarikoptic - added blank lines to test for resilience
+(r'''/proc on /proc type proc (rw,relatime)
+sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
+tmpfs on /dev/shm type tmpfs (rw,relatime)
+devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
+
+devpts on /dev/ptmx type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=666)
+
+''', 0, []),
 )