Fix detecting cube name

Cube name might not be equal to the package name stripped by 'cubicweb-'.
For instance cubicweb-saem-ref cube name is "saem_ref", not saem-ref.

Use a python script to detect the cube name using pkg_resources.

.dockerignore

@@ -3,4 +3,4 @@
 !pyramid.ini.j2
 !entrypoint.sh
 !check-docker-updates.sh
-!get-cube.sh
+!get-cube

Dockerfile

@@ -21,8 +21,8 @@ RUN apt-get update && apt-get -y --no-install-recommends install \
 RUN test $PYTHON = "python" && export py=python2 pip=pip2 || export py=python3 pip=pip3; \
     update-alternatives --install /usr/bin/python python /usr/bin/$py 50 && \
     update-alternatives --install /usr/bin/pip pip /usr/bin/$pip 50
-COPY check-docker-updates.sh get-cube.sh /usr/local/bin/
-RUN chmod +x /usr/local/bin/check-docker-updates.sh /usr/local/bin/get-cube.sh
+COPY check-docker-updates.sh get-cube /usr/local/bin/
+RUN chmod +x /usr/local/bin/check-docker-updates.sh /usr/local/bin/get-cube
 ENV PIP_NO_CACHE_DIR off
 ENV PIP_DISABLE_PIP_VERSION_CHECK on
 # Markdown require setuptools>=36

Dockerfile.onbuild

@@ -6,4 +6,4 @@ ONBUILD USER root
 ONBUILD COPY . /src/
 ONBUILD RUN pip install -e /src
 ONBUILD USER cubicweb
-ONBUILD RUN cubicweb-ctl create $(get-cube.sh) $CW_INSTANCE --automatic --no-db-create
+ONBUILD RUN cubicweb-ctl create $(get-cube) $CW_INSTANCE --automatic --no-db-create

entrypoint.sh

 #!/bin/sh
 set -e
-export CUBE=$(get-cube.sh)
+export CUBE=$(get-cube)
 test -z "$CUBE" && exit 1
 if test -z "$CW_DB_NAME"; then
     export CW_DB_NAME=$CUBE

get-cube

+#!/usr/bin/env python
+from __future__ import print_function
+
+import os
+import pkg_resources
+import subprocess
+
+
+def getcube():
+    if os.environ.get('CUBE'):
+        return os.environ['CUBE']
+    name = subprocess.check_output(
+        ['python', 'setup.py', '--name'], cwd='/src').decode().strip()
+    cubename = list(pkg_resources.get_distribution(
+        name).get_entry_map('cubicweb.cubes').keys())
+    assert len(cubename) == 1, (
+        "You should have exactly one entrypoint for 'cubicweb.cubes' "
+        "entrypoint in setup.py: got {0}".format(repr(cubename)))
+    return cubename[0]
+
+
+if __name__ == '__main__':
+    print(getcube())

get-cube.sh

-#!/bin/sh
-
-set -e
-
-if test -n "$CUBE"; then
-    echo "$CUBE"
-elif test -f /src/setup.py; then
-    python /src/setup.py --name | sed 's@cubicweb-@@g'
-else
-    >&2 echo "unable to deternine the cube name. You have to set it by the CUBE environment variable"
-    exit 1
-fi