Use a common python build/install role

In order to radically simplify how we prepare the service
venvs, we use a common role to do the wheel builds and the
venv preparation. This makes the process far simpler to
understand, because the role does its own building and
installing. It also reduces the code maintenance burden,
because instead of duplicating the build processes in the
repo_build role and the service role - we only have it all
done in a single place.

We also change the role venv tag var to use the integrated
build's common venv tag so that we can remove the role's
venv tag in group_vars in the integrated build. This reduces
memory consumption and also reduces the duplication.

This is by no means the final stop in the simplification
process, but it is a step forward. The will be work to follow
which:

1. Replaces 'developer mode' with an equivalent mechanism
   that uses the common role and is simpler to understand.
   We will also simplify the provisioning of pip install
   arguments when doing this.
2. Uses Rally's own in-repo upper constraints, instead of
   the OpenStack requirements repo constraints.

Depends-On: https://review.openstack.org/598957
Change-Id: I3f70f7879d399c36fb8d145e69ce4a609157ec30
Implements: blueprint python-build-install-simplification
Signed-off-by: Jesse Pretorius <jesse.pretorius@rackspace.co.uk>
This commit is contained in:
Jesse Pretorius 2018-09-02 19:21:14 +01:00 committed by Jesse Pretorius (odyssey4me)
parent d61d3acc68
commit 9fdc3ab178
2 changed files with 34 additions and 94 deletions

View File

@ -35,9 +35,19 @@ rally_developer_mode: false
rally_developer_constraints:
- "git+{{ rally_git_repo }}@{{ rally_git_install_branch }}#egg=rally"
# TODO(odyssey4me):
# This can be simplified once all the roles are using
# python_venv_build. We can then switch to using a
# set of constraints in pip.conf inside the venv,
# perhaps prepared by giving a giving a list of
# constraints to the role.
rally_pip_install_args: >-
{{ rally_developer_mode | ternary(pip_install_developer_constraints | default('--constraint /opt/developer-pip-constraints.txt'), '') }}
{{ (pip_install_upper_constraints is defined) | ternary('--constraint ' + pip_install_upper_constraints | default(''), '') }}
{{ pip_install_options | default('') }}
# Name of the virtual env to deploy into
rally_venv_tag: untagged
rally_venv_tag: "{{ venv_tag | default('untagged') }}"
rally_bin: "/openstack/venvs/rally-{{ rally_venv_tag }}/bin"
# venv_download, even when true, will use the fallback method of building the

View File

@ -13,17 +13,12 @@
# See the License for the specific language governing permissions and
# limitations under the License.
- name: Install distro packages
package:
name: "{{ rally_distro_packages }}"
state: "{{ rally_package_state }}"
update_cache: "{{ (ansible_pkg_mgr == 'apt') | ternary('yes', omit) }}"
cache_valid_time: "{{ (ansible_pkg_mgr == 'apt') | ternary(cache_timeout, omit) }}"
register: install_packages
until: install_packages is success
retries: 5
delay: 2
# TODO(odyssey4me):
# This can be simplified once all the roles are using
# python_venv_build. We can then switch to using a
# set of constraints in pip.conf inside the venv,
# perhaps prepared by giving a giving a list of
# constraints to the role.
- name: Create developer mode constraint file
copy:
dest: "/opt/developer-pip-constraints.txt"
@ -33,87 +28,22 @@
{% endfor %}
when: rally_developer_mode | bool
- name: Retrieve checksum for venv download
uri:
url: "{{ rally_venv_download_url | replace('tgz', 'checksum') }}"
return_content: yes
register: rally_venv_checksum
when: rally_venv_download | bool
- name: Attempt venv download
get_url:
url: "{{ rally_venv_download_url }}"
dest: "/var/cache/{{ rally_venv_download_url | basename }}"
checksum: "sha1:{{ rally_venv_checksum.content | trim }}"
register: rally_get_venv
when: rally_venv_download | bool
- name: Remove existing venv
file:
path: "{{ rally_bin | dirname }}"
state: absent
when: rally_get_venv is changed
- name: Create rally venv dir
file:
path: "{{ rally_bin | dirname }}"
state: directory
when: rally_get_venv is changed
- name: Unarchive pre-built venv
unarchive:
src: "/var/cache/{{ rally_venv_download_url | basename }}"
dest: "{{ rally_bin | dirname }}"
copy: "no"
when: rally_get_venv is changed
- name: Install pip packages
pip:
name: "{{ rally_pip_packages }}"
state: "{{ rally_pip_package_state }}"
virtualenv: "{{ rally_bin | dirname }}"
virtualenv_site_packages: "no"
extra_args: >-
{{ rally_developer_mode | ternary(pip_install_developer_constraints | default('--constraint /opt/developer-pip-constraints.txt'), '') }}
{{ (pip_install_upper_constraints is defined) | ternary('--constraint ' + pip_install_upper_constraints | default(''),'') }}
{{ pip_install_options | default('') }}
register: install_packages
until: install_packages is success
retries: 5
delay: 2
when: rally_get_venv | failed or rally_get_venv | skipped
- name: CentOS remove python from path first
file:
path: "{{ rally_bin | dirname }}/bin/python2.7"
state: "absent"
- name: Ensure remote wheel building is disabled in developer mode
set_fact:
venv_build_host: "{{ ansible_hostname }}"
when:
- ansible_pkg_mgr == 'yum'
- rally_get_venv is changed
- rally_developer_mode | bool
# NOTE(odyssey4me):
# We reinitialize the venv to ensure that the right
# version of python is in the venv, but we do not
# want virtualenv to also replace pip, setuptools
# and wheel so we tell it not to.
# We do not use --always-copy for CentOS/SuSE due
# to https://github.com/pypa/virtualenv/issues/565
- name: Reset virtualenv and update its paths
shell: |
find {{ rally_bin }} -name \*.pyc -delete
sed -si '1s/^.*python.*$/#!{{ rally_bin | replace ('/','\/') }}\/python/' {{ rally_bin }}/*
virtualenv {{ rally_bin | dirname }} \
{{ (ansible_pkg_mgr == 'apt') | ternary('--always-copy', '') }} \
--no-pip \
--no-setuptools \
--no-wheel
when: rally_get_venv is changed
tags:
- skip_ansible_lint
- name: Record the venv tag deployed
ini_file:
dest: "/etc/ansible/facts.d/openstack_ansible.fact"
section: rally
option: venv_tag
value: "{{ rally_venv_tag }}"
- name: Install the python venv
include_role:
name: "python_venv_build"
private: yes
vars:
venv_install_destination_path: "{{ rally_bin | dirname }}"
venv_install_distro_package_list: "{{ rally_distro_packages }}"
venv_pip_install_args: "{{ rally_pip_install_args }}"
venv_pip_packages: "{{ rally_pip_packages }}"
venv_facts_when_changed:
- section: "rally"
option: "venv_tag"
value: "{{ rally_venv_tag }}"