Add "get_licenses" method

.travis.yml

@@ -8,7 +8,9 @@ python:
 install:
 # develop seems to be required by travis since 02/2013
   - python setup.py build develop
-  - pip install nose coverage
+  - pip install nose coverage rosdep
+  - sudo `which rosdep` init
+  - rosdep update
 # command to run tests
 script:
   - nosetests --with-coverage --cover-package=rospkg --with-xunit test

src/rospkg/manifest.py

@@ -42,7 +42,7 @@
 from .common import MANIFEST_FILE, PACKAGE_FILE, STACK_FILE
 
 # stack.xml and manifest.xml have the same internal tags right now
-REQUIRED = ['license']
+REQUIRED = ['license', 'name']
 ALLOWXHTML = ['description']
 OPTIONAL = ['author', 'logo', 'url', 'brief', 'description', 'status',
             'notes', 'depend', 'rosdep', 'export', 'review',
@@ -318,7 +318,7 @@ class Manifest(object):
         'author', 'license', 'licenses', 'license_url', 'url',
         'depends', 'rosdeps', 'platforms',
         'exports', 'version',
-        'status', 'notes',
+        'status', 'name', 'notes',
         'unknown_tags', 'type', 'filename',
         'is_catkin']
 
@@ -334,6 +334,7 @@ def __init__(self, type_='package', filename=None, is_catkin=False):
             self.version = self.notes = ''
         self.licenses = []
         self.depends = []
+        self.licenses = []
         self.rosdeps = []
         self.exports = []
         self.platforms = []
@@ -396,6 +397,7 @@ def parse_manifest_file(dirpath, manifest_name, rospack=None):
         p = parse_package(package_filename)
         # put these into manifest
         manifest.description = p.description
+        manifest.name = p.name
         manifest.author = ', '.join([('Maintainer: %s' % str(m)) for m in p.maintainers] + [str(a) for a in p.authors])
         manifest.license = ', '.join(p.licenses)
         manifest.licenses = p.licenses
@@ -499,6 +501,7 @@ def parse_manifest(manifest_name, string, filename='string'):
         pass  # manifest is missing optional 'review notes' tag
 
     m.author = _check('author', True)(p, filename)
+    m.name = _check('name')(p, filename)
     m.url = _check('url')(p, filename)
     m.version = _check('version')(p, filename)
 

src/rospkg/rospack.py

@@ -30,6 +30,7 @@
 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
+from collections import defaultdict, OrderedDict
 import os
 from threading import Lock
 from xml.etree.cElementTree import ElementTree
@@ -387,6 +388,38 @@ def stack_of(self, package):
             else:
                 d = os.path.dirname(d)
 
+    def get_licenses(self, pkg_name, implicit=True):
+        """
+        @summary: Return a list of licenses and the packages in the dependency tree
+            for the given package. Special value 'ERR' is used as the license for the
+            packages that license was not detected for.
+        @param pkg_name: Name of the package the dependency tree begins from.
+        @return Dictionary of license name and a list of packages.
+        @rtype { k, [d] }
+        @raise ResourceNotFound
+        """
+        MSG_LICENSE_NOTFOUND_SYSPKG = "ERR"
+        license_dict = defaultdict(list)
+
+        self.get_depends(name=pkg_name, implicit=implicit)
+
+        for p_name, manifest in self._manifests.items():
+            for license in manifest.licenses:
+                license_dict[license].append(p_name)
+
+        # Traverse for Non-ROS, system packages
+        pkgnames_rosdep = self.get_rosdeps(package=pkg_name, implicit=implicit)
+        for pkgname_rosdep in pkgnames_rosdep:
+            license_dict[MSG_LICENSE_NOTFOUND_SYSPKG].append(pkgname_rosdep)
+
+        # Sort pkg names in each license
+        for list_key in license_dict.values():
+            list_key.sort()
+        # Sort license names
+        licenses = OrderedDict(sorted(license_dict.items()))
+        # Convert to dict for user friendlier output.
+        return dict(licenses)
+
 
 class RosStack(ManifestManager):
     """

test/catkin_package_tests/p1/bar/package.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0"?>
+<package format="2">
+  <name>bar</name>
+  <version>1.2.3</version>
+  <description>
+    I AM THE VERY MODEL OF A MODERN MAJOR GENERAL
+  </description>
+  <maintainer email="[email protected]">Someone</maintainer>
+
+  <license>MIT</license>
+
+  <url type="website">http://wiki.ros.org/bar</url>
+  <url type="bugtracker">http://www.github.com/my_org/bar/issues</url>
+  <author>Jane Doe</author>
+  <author email="[email protected]">Jane Doe</author>
+
+  <depend>liburdfdom-dev</depend>
+  <exec_depend>foo</exec_depend>
+  <test_depend>gtest</test_depend>
+  <export />
+</package>

test/catkin_package_tests/p1/foo/package.xml

@@ -14,9 +14,6 @@
   <author>John Doe</author>
   <author email="[email protected]">Jane Doe</author>
 
-  <build_depend>catkin</build_depend>
-  <build_depend version_gte="1.1" version_lt="2.0">genmsg</build_depend>
-
   <build_depend>libboost-thread-dev</build_depend>
   <run_depend>libboost-thread</run_depend>
 

test/test_rospkg_catkin_packages.py

@@ -40,17 +40,18 @@
 
 
 def test_find_packages():
+    PKGS_EXIST = ['foo', 'bar']
     manager = rospkg.rospack.ManifestManager(rospkg.common.MANIFEST_FILE, ros_paths=[search_path])
     # for backward compatibility a wet package which is not a metapackage is found when searching for MANIFEST_FILE
-    assert(len(manager.list()) == 1)
+    assert(len(manager.list()) == 2)
     manager = rospkg.rospack.ManifestManager(rospkg.common.STACK_FILE, ros_paths=[search_path])
     assert(len(manager.list()) == 0)
     manager = rospkg.rospack.ManifestManager(rospkg.common.PACKAGE_FILE, ros_paths=[search_path])
 
     for pkg_name in manager.list():
-        assert(pkg_name == 'foo')
+        assert(pkg_name in PKGS_EXIST)
         path = manager.get_path(pkg_name)
-        assert(path == os.path.join(search_path, 'p1', 'foo'))
+        assert(path == os.path.join(search_path, 'p1', PKGS_EXIST[PKGS_EXIST.index(pkg_name)]))
 
 
 def test_get_manifest():
@@ -67,3 +68,12 @@ def test_licenses():
     assert(len(manif.licenses) == 2)
     for l in manif.licenses:
         assert(l in licenses_list)
+
+
+def test_get_licenses():
+    """Check licenses from all packages in the dependency chain"""
+    rospack = rospkg.rospack.RosPack(ros_paths=[search_path])
+    licenses = rospack.get_licenses("bar", implicit=True)
+    assert("MIT" in licenses)
+    assert("BSD" in licenses)
+    assert("LGPL" in licenses)