pip-and-virtualenv : install python2 & 3, and default to 2
Recent changes in project-config have shown that we leave the system in an inconsistent state when installing from source. On fedora, we will have installed the python2 packages, but then used $DIB_PYTHON to install python3 pip from source! This tries to clarify the situation. As described in the document, with package installs, we just install the $DIB_PYTHON packaged versions. Source installs want to take over the global namespace. This is the price you pay for running the latest versions outside package managers :) The only sane thing seems to be for us to normalise python2 & python3 versions of pip, setuptools and virtualenv and then hacking things such that "/usr/bin/pip" and "/usr/bin/virtalenv" remain defaulted to python2 versions. Documentation is added Change-Id: Ibc6572b89e256d1f48b7fe7c672b8b9524dc704f
This commit is contained in:
Ian Wienand
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ffd4820d59
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@ -2,14 +2,72 @@
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pip-and-virtualenv
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==================
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This element installs pip and virtualenv in the image. If the package
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installtype is used then these programs are installed from distribution
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packages. If the source installtype is used these programs are installed
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from get-pip.py and pip (respectively).
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This element installs pip and virtualenv in the image.
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To install pip and virtualenv from package:
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Package install
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===============
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If the package installtype is used then these programs are installed
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from distribution packages. In this case, ``pip`` and ``virtualenv``
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will be installed *only* for the python version identified by
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``dib-python`` (i.e. the default python for the platform).
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Distribution packages have worked out name-spacing such that only
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python2 or python3 owns common scripts like ``/usr/bin/pip`` (on most
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platforms, ``pip`` refers to python2 pip, and ``pip3`` refers to
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python3 pip, although some may choose the reverse).
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To install pip and virtualenv from package::
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export DIB_INSTALLTYPE_pip_and_virtualenv=package
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Source install
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==============
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Source install is the default. If the source installtype is used,
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``pip`` and ``virtualenv`` are installed from the latest upstream
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releases.
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Source installs from these tools are not name-spaced. It is
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inconsistent across platforms if the first or last install gets to own
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common scripts like ``/usr/bin/pip`` and ``virtualenv``.
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To avoid inconsistency, we firstly install the packaged python 2
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**and** 3 versions of ``pip`` and ``virtualenv``. This prevents a
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later install of these distribution packages conflicting with the
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source install. We then overwrite ``pip`` and ``virtualenv`` via
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``get-pip.py`` and ``pip`` respectively.
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The system will be left in the following state:
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* ``/usr/bin/pip`` : python2 pip
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* ``/usr/bin/pip2`` : python2 pip (same as prior)
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* ``/usr/bin/pip3`` : python3 pip
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* ``/usr/bin/virtualenv`` : python2 virtualenv
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(note python3 ``virtualenv`` script is *not* installed, see below)
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Using the tools
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===============
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Due to the essentially unsolvable problem of "who owns the script", it
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is recommended to *not* call ``pip`` or ``virtualenv`` directly. You
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can directly call them with the ``-m`` argument to the python
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interpreter you wish to install with.
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For example, to create a python3 environment do::
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# python3 -m virtualenv myenv
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# myenv/bin/pip install mytool
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To install a python2 tool from pip::
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# python2 -m pip install mytool
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In this way, you can always know which interpreter is being used (and
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affected by) the call.
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Ordering
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========
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Any element that uses these commands must be designated as
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05-* or higher to ensure that they are first installed.
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@ -7,6 +7,14 @@ set -eu
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set -o pipefail
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if [[ $DISTRO_NAME =~ (opensuse|fedora|centos|centos7|rhel|rhel7) ]]; then
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_do_py3=0
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packages="python-virtualenv python-pip python-setuptools"
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if [[ $DISTRO_NAME =~ (fedora) ]]; then
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_do_py3=1
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packages+=" python3-virtualenv python3-pip python3-setuptools"
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fi
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# GENERAL WARNING : mixing packaged python libraries with
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# pip-installed versions always creates issues. Upstream
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# openstack-infra uses this a lot (especially devstack) but be
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@ -19,11 +27,11 @@ if [[ $DISTRO_NAME =~ (opensuse|fedora|centos|centos7|rhel|rhel7) ]]; then
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if [[ $DISTRO_NAME = opensuse ]]; then
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zypper -n install python-virtualenv python-pip python-setuptools
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else
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${YUM:-yum} install -y python-virtualenv python-pip python-setuptools
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${YUM:-yum} install -y $packages
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fi
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# install the latest pip; this overwrites packaged pip
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${DIB_PYTHON} /tmp/get-pip.py
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# install the latest python2 pip; this overwrites packaged pip
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python /tmp/get-pip.py
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# pip and setuptools are closely related; we want to ensure the
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# latest for sanity. Because distro packages don't include enough
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@ -38,10 +46,38 @@ if [[ $DISTRO_NAME =~ (opensuse|fedora|centos|centos7|rhel|rhel7) ]]; then
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rm -rf /usr/lib/python2.7/site-packages/setuptools*
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pip install -U setuptools
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if [[ $_do_py3 -eq 1 ]]; then
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# Repeat above for python3
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# You would think that installing python3 bits first, then
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# python2 would work -- alas get-pip.py doesn't seem to leave
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# python3 alone:
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# https://github.com/pypa/pip/issues/4435
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python3 /tmp/get-pip.py
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rm -rf /usr/lib/python3.?/site-packages/setuptools*
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pip3 install -U setuptools
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# reclaim /usr/bin/pip back to pip2
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ln -sf /usr/bin/pip2 /usr/bin/pip
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fi
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# now install latest virtualenv. it vendors stuff it needs so
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# doesn't have issues with other system packages.
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# python[2|3]-virtualenv package has installed versioned scripts
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# (/usr/bin/virtualenv-[2|3]) but upstream does not! (see [2]).
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# For consistency, clear them out and then reinstall so we're just
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# left with python2's version
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# [2] http://pkgs.fedoraproject.org/cgit/rpms/python-virtualenv.git/tree/python-virtualenv.spec#n116)
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rm /usr/bin/virtualenv*
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if [[ $_do_py3 -eq 1 ]]; then
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pip3 install -U virtualenv
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fi
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pip install -U virtualenv
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# at this point, we should have the latest
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# pip/setuptools/virtualenv packages for python2 & 3, and
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# "/usr/bin/pip" and "/usr/bin/virtualenv" should be python2
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# versions.
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if [[ $DISTRO_NAME = opensuse ]]; then
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for pkg in virtualenv pip setuptools; do
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cat - >> /etc/zypp/locks <<EOF
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@ -62,9 +98,18 @@ EOF
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else
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die "No conf to modify?"
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fi
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echo "exclude=python-virtualenv,python-pip,python-setuptools" >> ${conf}
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echo "exclude=$packages" >> ${conf}
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fi
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else
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${DIB_PYTHON} /tmp/get-pip.py
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# pre-install packages, we will overwrite with latest below
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apt-get -y install python-pip python3-pip \
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python-virtualenv python3-virtualenv
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# These install into /usr/local/bin so override any packages, even
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# if installed later.
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python3 /tmp/get-pip.py
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python2 /tmp/get-pip.py
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pip3 install virtualenv
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pip install virtualenv
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fi
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