[pkg] separate leap requirements

this is part of a process to make the setup of the development mode less
troublesome. from now on, setting up a virtualenv in pure development
mode will be as easy as telling pip to just install the external dependencies::

  pip install -r pkg/requirements.pip

and traversing all the leap repos for the needed leap dependencies doing::

  python setup.py develop

- Related: #7288

3 files changed, 24 insertions, 9 deletions

diff --git a/common/pkg/requirements-leap.pip b/common/pkg/requirements-leap.pip
new file mode 100644
index 00000000..b311859e
--- /dev/null
+++ b/common/pkg/requirements-leap.pip
@@ -0,0 +1 @@
+leap.common>=0.4.0
diff --git a/common/pkg/requirements.pip b/common/pkg/requirements.pip
index b91186e7..287741d2 100644
--- a/common/pkg/requirements.pip
+++ b/common/pkg/requirements.pip
@@ -1,9 +1,6 @@
 simplejson
 u1db
 
-# leap deps -- bump me!
-leap.common>=0.4.0
-
 # XXX -- fix me!
 # oauth is not strictly needed by us, but we need it until u1db adds it to its
 # release as a dep.
diff --git a/common/pkg/utils.py b/common/pkg/utils.py
index deace14b..d1680102 100644
--- a/common/pkg/utils.py
+++ b/common/pkg/utils.py
@@ -14,20 +14,34 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
 """
 Utils to help in the setup process
 """
-
 import os
 import re
 import sys
 
 
+def is_develop_mode():
+    """
+    Returns True if we're calling the setup script using the argument for
+    setuptools development mode.
+
+    This avoids messing up with dependency pinning and order, the
+    responsibility of installing the leap dependencies is left to the
+    developer.
+    """
+    args = sys.argv
+    devflags = "setup.py", "develop"
+    if (args[0], args[1]) == devflags:
+        return True
+    return False
+
+
 def get_reqs_from_files(reqfiles):
     """
     Returns the contents of the top requirement file listed as a
-    string list with the lines
+    string list with the lines.
 
     @param reqfiles: requirement files to parse
     @type reqfiles: list of str
@@ -43,6 +57,9 @@ def parse_requirements(reqfiles=['requirements.txt',
     """
     Parses the requirement files provided.
 
+    The passed reqfiles list is a list of possible locations to try, the
+    function will return the contents of the first path found.
+
     Checks the value of LEAP_VENV_SKIP_PYSIDE to see if it should
     return PySide as a dep or not. Don't set, or set to 0 if you want
     to install it through pip.
@@ -58,9 +75,9 @@ def parse_requirements(reqfiles=['requirements.txt',
         if re.match(r'\s*-e\s+', line):
             pass
             # do not try to do anything with externals on vcs
-            #requirements.append(re.sub(r'\s*-e\s+.*#egg=(.*)$', r'\1',
-                                #line))
-        # http://foo.bar/baz/foobar/zipball/master#egg=foobar
+            # requirements.append(re.sub(r'\s*-e\s+.*#egg=(.*)$', r'\1',
+            # line))
+            # http://foo.bar/baz/foobar/zipball/master#egg=foobar
         elif re.match(r'\s*https?:', line):
             requirements.append(re.sub(r'\s*https?:.*#egg=(.*)$', r'\1',
                                 line))