Add build system detection

Change-Id: Iaa1572cf3d5fd7baf96d2084f7194953bede634c

2 files changed, 58 insertions, 0 deletions

diff --git a/baserockimport/mainloop.py b/baserockimport/mainloop.py
index 9aa38ff..7d7cd87 100644
--- a/baserockimport/mainloop.py
+++ b/baserockimport/mainloop.py
@@ -233,6 +233,9 @@ class ImportLoop(object):
 
         package.version_in_use = checked_out_version
 
+        if not self.generate_chunk_morphs:
+            package.detect_build_system(source_repo.list_files())
+
         with morphlib.util.temp_dir() as td:
             source_repo.clone_into(td, ref=ref)
             temp_repo = morphlib.gitdir.GitDirectory(td)
@@ -641,6 +644,9 @@ class ImportLoop(object):
                 'unpetrify-ref': package.named_ref,
             }
 
+            if package.build_system is not None:
+                entry['build-system'] = package.build_system
+
             if morphology is not None:
                 entry['morph'] = morphology.filename
 
diff --git a/baserockimport/package.py b/baserockimport/package.py
index 8df011b..ddeaa51 100644
--- a/baserockimport/package.py
+++ b/baserockimport/package.py
@@ -26,6 +26,7 @@ class Package(object):
         self._kind = kind
         self._name = name
         self._version = version
+        self._build_system = None
         self.required_by = []
         self.morphology = None
         self.repo_url = None
@@ -77,3 +78,54 @@ class Package(object):
     @property
     def parent(self):
         return self.required_by[0] if len(self.required_by) > 0 else None
+
+    @property
+    def build_system(self):
+        return self._build_system
+
+    def detect_build_system(self, file_iter):
+        '''Automatically detect the build system, if possible.
+
+        If the build system cannot be detected automatically, return None.
+        '''
+
+        build_systems = {
+            'autotools': [
+                'autogen',
+                'autogen.sh',
+                'configure',
+                'configure.ac',
+                'configure.in',
+                'configure.in.in',
+            ],
+            'python-distutils': [
+                'setup.py'
+            ],
+            'cpan': [
+                'Makefile.PL'
+            ],
+            'module-build': [
+                'Build.PL'
+            ],
+            'cmake': [
+                'CMakeLists.txt',
+            ],
+            'qmake': [
+                '.pro'
+            ]
+        }
+
+        # Aside from ensuring generated definitions are stable,
+        # an explicit ordering allows us to favour one build system
+        # over another in the case that a single repo supports more
+        # than one build system.
+        order = ['autotools', 'python-distutils', 'cpan', 'module-build',
+                 'cmake', 'qmake']
+
+        files = set(file_iter)
+        for bs in order:
+            indicators = set(build_systems[bs])
+
+            if not files.isdisjoint(indicators):
+                self._build_system = bs
+                return