openstack/charm-barbican
Code Issues Proposed changes

Migrate charm charmhub for stable/wallaby

Browse Source 
- start from stable/wallaby branch
- Do charmcraft, osci, zuul changes
- Modify libs to point to stable/wallaby for:
  - charmhelpers
  - charms.openstack (as needed)
  - zaza & zaza.openstack.tests
- Remove unsupported test bundles
- migration bundles to charmhub.io (ch: prefix + channels)
- Build on 20.04 amd64
- Run on 20.04 amd64, s390x, ppc64el, arm64

Change-Id: Ib8d0ffa7df07a75c9258794c18e80c785912cae7
This commit is contained in:
Alex Kavanagh 2022-05-17 19:12:54 +01:00
parent d679b0e814
commit 4e52f9f81d
27 changed files with 137 additions and 647 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.gitignore vendored
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@ -6,3 +6,4 @@ trusty
.testrepository
__pycache__
.stestr
*.charm

2
.gitreview
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@ -3,4 +3,4 @@ host=review.opendev.org
port=29418
project=openstack/charm-barbican.git
defaultbranch=stable/21.10
defaultbranch=stable/wallaby

2
.zuul.yaml
View File

@ -1,4 +1,4 @@
- project:
templates:
- openstack-python3-charm-jobs
- openstack-python3-wallaby-jobs
- openstack-cover-jobs

7
build-requirements.txt Normal file
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@ -0,0 +1,7 @@
# NOTES(lourot):
# * We don't install charmcraft via pip anymore because it anyway spins up a
# container and scp the system's charmcraft snap inside it. So the charmcraft
# snap is necessary on the system anyway.
# * `tox -e build` successfully validated with charmcraft 1.2.1
cffi==1.14.6; python_version < '3.6' # cffi 1.15.0 drops support for py35.

30
charmcraft.yaml Normal file
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@ -0,0 +1,30 @@
type: charm
parts:
charm:
build-packages:
- tox
- git
- python3-dev
override-build: |
apt-get install ca-certificates -y
tox -e build-reactive
override-stage: |
echo "Copying charm to staging area: $CHARMCRAFT_STAGE"
NAME=$(ls $CHARMCRAFT_PART_BUILD/build/builds)
cp -r $CHARMCRAFT_PART_BUILD/build/builds/$NAME/* $CHARMCRAFT_STAGE/
override-prime: |
# For some reason, the normal priming chokes on the fact that there's a
# hooks directory.
cp -r $CHARMCRAFT_STAGE/* .
bases:
- build-on:
- name: ubuntu
channel: "20.04"
architectures:
- amd64
run-on:
- name: ubuntu
channel: "20.04"
architectures: [amd64, s390x, ppc64el, arm64]

1
metadata.yaml Symbolic link
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@ -0,0 +1 @@
src/metadata.yaml

22
osci.yaml
View File

@ -1,23 +1,9 @@
- project:
templates:
- charm-unit-jobs
# using overridden, shorter functional list because the charm does
# already in the tests.yaml
# - charm-functional-jobs
check:
jobs:
- impish-xena:
voting: false
- hirsute-wallaby
- groovy-victoria
- focal-xena:
voting: false
- focal-wallaby
- focal-victoria
- focal-ussuri
- bionic-ussuri
- bionic-train
- bionic-stein
- charm-unit-jobs-py38
- charm-victoria-functional-jobs
- charm-wallaby-functional-jobs
vars:
needs_charm_build: true
charm_build_name: barbican
build_type: charmcraft

13
rename.sh Executable file
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@ -0,0 +1,13 @@
#!/bin/bash
charm=$(grep "charm_build_name" osci.yaml | awk '{print $2}')
echo "renaming ${charm}_*.charm to ${charm}.charm"
echo -n "pwd: "
pwd
ls -al
echo "Removing bad downloaded charm maybe?"
if [[ -e "${charm}.charm" ]];
then
rm "${charm}.charm"
fi
echo "Renaming charm here."
mv ${charm}_*.charm ${charm}.charm

1
requirements.txt
View File

@ -9,6 +9,7 @@
setuptools<50.0.0 # https://github.com/pypa/setuptools/commit/04e3df22df840c6bb244e9b27bc56750c44b7c85
# Build requirements
pyparsing<3.0.0 # cffi needs pyparsing < 3.0.0.
cffi==1.14.6; python_version < '3.6' # cffi 1.15.0 drops support for py35.
charm-tools==2.8.3

12
src/build.lock
View File

@ -180,17 +180,11 @@
"vcs": null,
"version": "1.1.1"
},
{
"type": "python_module",
"package": "Tempita",
"vcs": null,
"version": "0.4"
},
{
"type": "python_module",
"package": "charms.openstack",
"url": "git+https://github.com/openstack/charms.openstack.git",
"branch": "refs/heads/stable/21.10",
"branch": "stable/wallaby",
"version": "10627ee5f991c268f174d6d100e218a0e1867af1",
"vcs": "git"
},
@ -210,8 +204,8 @@
"type": "python_module",
"package": "charmhelpers",
"url": "git+https://github.com/juju/charm-helpers.git",
"branch": "refs/heads/stable/21.10",
"version": "26efcd0da51d580f68ead2ca13c38f58766f8a14",
"branch": "stable/wallaby",
"version": "f8f822d5e908b1ac5694815c2d5522b6533e04f8",
"vcs": "git"
},
{

4
src/metadata.yaml
View File

@ -8,11 +8,7 @@ description: |
tags:
- openstack
series:
- bionic
- focal
- groovy
- hirsute
- impish
subordinate: false
requires:
shared-db:

8
src/test-requirements.txt
View File

@ -5,5 +5,9 @@
#
# Functional Test Requirements (let Zaza's dependencies solve all dependencies here!)
git+https://github.com/openstack-charmers/zaza.git@stable/21.10#egg=zaza
git+https://github.com/openstack-charmers/zaza-openstack-tests.git@stable/21.10#egg=zaza.openstack
git+https://github.com/openstack-charmers/zaza.git@stable/wallaby#egg=zaza
git+https://github.com/openstack-charmers/zaza-openstack-tests.git@stable/wallaby#egg=zaza.openstack
# Need tox to be available from tox... inception yes, but its a workaround for now
tox

50
src/tests/bundles/bionic-rocky.yaml
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@ -1,50 +0,0 @@
series: bionic
machines:
'0':
constraints: mem=3072M
'1':
'2':
'3':
applications:
mysql:
charm: cs:~openstack-charmers/percona-cluster
num_units: 1
to:
- '0'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: cloud:bionic-rocky
to:
- '1'
barbican:
series: bionic
charm: ../../../barbican
num_units: 1
options:
openstack-origin: cloud:bionic-rocky
debug: true
to:
- '2'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '3'
relations:
- - mysql:shared-db
- keystone:shared-db
- - mysql:shared-db
- barbican:shared-db
- - keystone:identity-service
- barbican:identity-service
- - rabbitmq-server:amqp
- barbican:amqp

50
src/tests/bundles/bionic-stein.yaml
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@ -1,50 +0,0 @@
series: bionic
machines:
'0':
constraints: mem=3072M
'1':
'2':
'3':
applications:
mysql:
charm: cs:~openstack-charmers/percona-cluster
num_units: 1
to:
- '0'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: cloud:bionic-stein
to:
- '1'
barbican:
series: bionic
charm: ../../../barbican
num_units: 1
options:
openstack-origin: cloud:bionic-stein
debug: true
to:
- '2'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '3'
relations:
- - mysql:shared-db
- keystone:shared-db
- - mysql:shared-db
- barbican:shared-db
- - keystone:identity-service
- barbican:identity-service
- - rabbitmq-server:amqp
- barbican:amqp

50
src/tests/bundles/bionic-train.yaml
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@ -1,50 +0,0 @@
series: bionic
machines:
'0':
constraints: mem=3072M
'1':
'2':
'3':
applications:
mysql:
charm: cs:~openstack-charmers/percona-cluster
num_units: 1
to:
- '0'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: cloud:bionic-train
to:
- '1'
barbican:
series: bionic
charm: ../../../barbican
num_units: 1
options:
openstack-origin: cloud:bionic-train
debug: true
to:
- '2'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '3'
relations:
- - mysql:shared-db
- keystone:shared-db
- - mysql:shared-db
- barbican:shared-db
- - keystone:identity-service
- barbican:identity-service
- - rabbitmq-server:amqp
- barbican:amqp

50
src/tests/bundles/bionic-ussuri.yaml
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@ -1,50 +0,0 @@
series: bionic
machines:
'0':
constraints: mem=3072M
'1':
'2':
'3':
applications:
mysql:
charm: cs:~openstack-charmers/percona-cluster
num_units: 1
to:
- '0'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: cloud:bionic-ussuri
to:
- '1'
barbican:
series: bionic
charm: ../../../barbican
num_units: 1
options:
openstack-origin: cloud:bionic-ussuri
debug: true
to:
- '2'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '3'
relations:
- - mysql:shared-db
- keystone:shared-db
- - mysql:shared-db
- barbican:shared-db
- - keystone:identity-service
- barbican:identity-service
- - rabbitmq-server:amqp
- barbican:amqp

74
src/tests/bundles/focal-ussuri.yaml
View File

@ -1,74 +0,0 @@
variables:
openstack-origin: &openstack-origin distro
series: &series focal
machines:
'0':
constraints: mem=3072M
'1':
constraints: mem=3072M
'2':
constraints: mem=3072M
'3':
'4':
'5':
applications:
keystone-mysql-router:
charm: cs:~openstack-charmers/mysql-router
barbican-mysql-router:
charm: cs:~openstack-charmers/mysql-router
mysql-innodb-cluster:
charm: cs:~openstack-charmers/mysql-innodb-cluster
num_units: 3
options:
source: *openstack-origin
to:
- '0'
- '1'
- '2'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: *openstack-origin
to:
- '3'
barbican:
series: *series
charm: ../../../barbican
num_units: 1
options:
openstack-origin: *openstack-origin
debug: true
to:
- '4'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '5'
relations:
- - 'keystone:shared-db'
- 'keystone-mysql-router:shared-db'
- - 'keystone-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'barbican:shared-db'
- 'barbican-mysql-router:shared-db'
- - 'barbican-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'keystone:identity-service'
- 'barbican:identity-service'
- - 'rabbitmq-server:amqp'
- 'barbican:amqp'

19
src/tests/bundles/focal-victoria.yaml
View File

@ -1,3 +1,5 @@
local_overlay_enabled: False
variables:
openstack-origin: &openstack-origin cloud:focal-victoria
@ -17,12 +19,14 @@ machines:
applications:
keystone-mysql-router:
charm: cs:~openstack-charmers/mysql-router
charm: ch:mysql-router
channel: 8.0/edge
barbican-mysql-router:
charm: cs:~openstack-charmers/mysql-router
charm: ch:mysql-router
channel: 8.0/edge
mysql-innodb-cluster:
charm: cs:~openstack-charmers/mysql-innodb-cluster
charm: ch:mysql-innodb-cluster
num_units: 3
options:
source: *openstack-origin
@ -30,18 +34,20 @@ applications:
- '0'
- '1'
- '2'
channel: 8.0/edge
keystone:
charm: cs:~openstack-charmers/keystone
charm: ch:keystone
num_units: 1
options:
openstack-origin: *openstack-origin
to:
- '3'
channel: wallaby/edge
barbican:
series: *series
charm: ../../../barbican
charm: ../../../barbican.charm
num_units: 1
options:
openstack-origin: *openstack-origin
@ -50,10 +56,11 @@ applications:
- '4'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
charm: ch:rabbitmq-server
num_units: 1
to:
- '5'
channel: 3.8/edge
relations:

19
src/tests/bundles/focal-wallaby.yaml
View File

@ -1,3 +1,5 @@
local_overlay_enabled: False
variables:
openstack-origin: &openstack-origin cloud:focal-wallaby
@ -17,12 +19,14 @@ machines:
applications:
keystone-mysql-router:
charm: cs:~openstack-charmers/mysql-router
charm: ch:mysql-router
channel: 8.0/edge
barbican-mysql-router:
charm: cs:~openstack-charmers/mysql-router
charm: ch:mysql-router
channel: 8.0/edge
mysql-innodb-cluster:
charm: cs:~openstack-charmers/mysql-innodb-cluster
charm: ch:mysql-innodb-cluster
num_units: 3
options:
source: *openstack-origin
@ -30,18 +34,20 @@ applications:
- '0'
- '1'
- '2'
channel: 8.0/edge
keystone:
charm: cs:~openstack-charmers/keystone
charm: ch:keystone
num_units: 1
options:
openstack-origin: *openstack-origin
to:
- '3'
channel: wallaby/edge
barbican:
series: *series
charm: ../../../barbican
charm: ../../../barbican.charm
num_units: 1
options:
openstack-origin: *openstack-origin
@ -50,10 +56,11 @@ applications:
- '4'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
charm: ch:rabbitmq-server
num_units: 1
to:
- '5'
channel: 3.8/edge
relations:

74
src/tests/bundles/focal-xena.yaml
View File

@ -1,74 +0,0 @@
variables:
openstack-origin: &openstack-origin cloud:focal-xena
series: &series focal
machines:
'0':
constraints: mem=3072M
'1':
constraints: mem=3072M
'2':
constraints: mem=3072M
'3':
'4':
'5':
applications:
keystone-mysql-router:
charm: cs:~openstack-charmers/mysql-router
barbican-mysql-router:
charm: cs:~openstack-charmers/mysql-router
mysql-innodb-cluster:
charm: cs:~openstack-charmers/mysql-innodb-cluster
num_units: 3
options:
source: *openstack-origin
to:
- '0'
- '1'
- '2'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: *openstack-origin
to:
- '3'
barbican:
series: *series
charm: ../../../barbican
num_units: 1
options:
openstack-origin: *openstack-origin
debug: true
to:
- '4'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '5'
relations:
- - 'keystone:shared-db'
- 'keystone-mysql-router:shared-db'
- - 'keystone-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'barbican:shared-db'
- 'barbican-mysql-router:shared-db'
- - 'barbican-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'keystone:identity-service'
- 'barbican:identity-service'
- - 'rabbitmq-server:amqp'
- 'barbican:amqp'

74
src/tests/bundles/groovy-victoria.yaml
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@ -1,74 +0,0 @@
variables:
openstack-origin: &openstack-origin distro
series: &series groovy
machines:
'0':
constraints: mem=3072M
'1':
constraints: mem=3072M
'2':
constraints: mem=3072M
'3':
'4':
'5':
applications:
keystone-mysql-router:
charm: cs:~openstack-charmers/mysql-router
barbican-mysql-router:
charm: cs:~openstack-charmers/mysql-router
mysql-innodb-cluster:
charm: cs:~openstack-charmers/mysql-innodb-cluster
num_units: 3
options:
source: *openstack-origin
to:
- '0'
- '1'
- '2'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: *openstack-origin
to:
- '3'
barbican:
series: *series
charm: ../../../barbican
num_units: 1
options:
openstack-origin: *openstack-origin
debug: true
to:
- '4'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '5'
relations:
- - 'keystone:shared-db'
- 'keystone-mysql-router:shared-db'
- - 'keystone-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'barbican:shared-db'
- 'barbican-mysql-router:shared-db'
- - 'barbican-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'keystone:identity-service'
- 'barbican:identity-service'
- - 'rabbitmq-server:amqp'
- 'barbican:amqp'

74
src/tests/bundles/hirsute-wallaby.yaml
View File

@ -1,74 +0,0 @@
variables:
openstack-origin: &openstack-origin distro
series: &series hirsute
machines:
'0':
constraints: mem=3072M
'1':
constraints: mem=3072M
'2':
constraints: mem=3072M
'3':
'4':
'5':
applications:
keystone-mysql-router:
charm: cs:~openstack-charmers/mysql-router
barbican-mysql-router:
charm: cs:~openstack-charmers/mysql-router
mysql-innodb-cluster:
charm: cs:~openstack-charmers/mysql-innodb-cluster
num_units: 3
options:
source: *openstack-origin
to:
- '0'
- '1'
- '2'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: *openstack-origin
to:
- '3'
barbican:
series: *series
charm: ../../../barbican
num_units: 1
options:
openstack-origin: *openstack-origin
debug: true
to:
- '4'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '5'
relations:
- - 'keystone:shared-db'
- 'keystone-mysql-router:shared-db'
- - 'keystone-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'barbican:shared-db'
- 'barbican-mysql-router:shared-db'
- - 'barbican-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'keystone:identity-service'
- 'barbican:identity-service'
- - 'rabbitmq-server:amqp'
- 'barbican:amqp'

74
src/tests/bundles/impish-xena.yaml
View File

@ -1,74 +0,0 @@
variables:
openstack-origin: &openstack-origin distro
series: &series impish
machines:
'0':
constraints: mem=3072M
'1':
constraints: mem=3072M
'2':
constraints: mem=3072M
'3':
'4':
'5':
applications:
keystone-mysql-router:
charm: cs:~openstack-charmers/mysql-router
barbican-mysql-router:
charm: cs:~openstack-charmers/mysql-router
mysql-innodb-cluster:
charm: cs:~openstack-charmers/mysql-innodb-cluster
num_units: 3
options:
source: *openstack-origin
to:
- '0'
- '1'
- '2'
keystone:
charm: cs:~openstack-charmers/keystone
num_units: 1
options:
openstack-origin: *openstack-origin
to:
- '3'
barbican:
series: *series
charm: ../../../barbican
num_units: 1
options:
openstack-origin: *openstack-origin
debug: true
to:
- '4'
rabbitmq-server:
charm: cs:~openstack-charmers/rabbitmq-server
num_units: 1
to:
- '5'
relations:
- - 'keystone:shared-db'
- 'keystone-mysql-router:shared-db'
- - 'keystone-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'barbican:shared-db'
- 'barbican-mysql-router:shared-db'
- - 'barbican-mysql-router:db-router'
- 'mysql-innodb-cluster:db-router'
- - 'keystone:identity-service'
- 'barbican:identity-service'
- - 'rabbitmq-server:amqp'
- 'barbican:amqp'

21
src/tests/tests.yaml
View File

@ -1,23 +1,10 @@
charm_name: barbican
smoke_bundles:
- focal-ussuri
smoke_bundles: []
gate_bundles:
- impish-xena
- groovy-victoria
- focal-xena
- focal-wallaby
- focal-victoria
- focal-ussuri
- bionic-ussuri
- bionic-train
- bionic-stein
dev_bundles:
- hirsute-wallaby
- bionic-rocky
- focal-wallaby
dev_bundles: []
tests:
- zaza.openstack.charm_tests.barbican.tests.BarbicanTest
tests_options:
force_deploy:
- hirsute-wallaby
- groovy-victoria
- impish-xena
force_deploy: []

4
src/wheelhouse.txt
View File

@ -1,5 +1,5 @@
psutil
git+https://github.com/openstack/charms.openstack.git@stable/21.10#egg=charms.openstack
git+https://github.com/openstack/charms.openstack.git@stable/wallaby#egg=charms.openstack
git+https://github.com/juju/charm-helpers.git@stable/21.10#egg=charmhelpers
git+https://github.com/juju/charm-helpers@stable/wallaby#egg=charmhelpers

3
test-requirements.txt
View File

@ -3,6 +3,7 @@
# choices of *requirements.txt files for OpenStack Charms:
# https://github.com/openstack-charmers/release-tools
#
pyparsing<3.0.0 # cffi needs pyparsing < 3.0.0.
cffi==1.14.6; python_version < '3.6' # cffi 1.15.0 drops support for py35.
setuptools<50.0.0 # https://github.com/pypa/setuptools/commit/04e3df22df840c6bb244e9b27bc56750c44b7c85
@ -34,7 +35,7 @@ mock>=1.2; python_version >= '3.6'
nose>=1.3.7
coverage>=3.6
git+https://github.com/openstack/charms.openstack.git@stable/21.10#egg=charms.openstack
git+https://github.com/openstack/charms.openstack.git@stable/wallaby#egg=charms.openstack
#
# Revisit for removal / mock improvement:
#

45
tox.ini
View File

@ -37,11 +37,24 @@ setenv = VIRTUAL_ENV={envdir}
passenv = http_proxy https_proxy INTERFACE_PATH LAYER_PATH JUJU_REPOSITORY
install_command =
{toxinidir}/pip.sh install {opts} {packages}
allowlist_externals =
charmcraft
bash
tox
rename.sh
deps =
-r{toxinidir}/requirements.txt
[testenv:build]
basepython = python3
deps = -r{toxinidir}/build-requirements.txt
commands =
charmcraft clean
charmcraft -v build
{toxinidir}/rename.sh
[testenv:build-reactive]
basepython = python3
commands =
charm-build --log-level DEBUG --use-lock-file-branches -o {toxinidir}/build/builds src {posargs}
@ -55,32 +68,44 @@ basepython = python3
deps = -r{toxinidir}/test-requirements.txt
commands = stestr run --slowest {posargs}
[testenv:py35]
basepython = python3.5
deps = -r{toxinidir}/test-requirements.txt
commands = stestr run --slowest {posargs}
[testenv:py36]
basepython = python3.6
deps = -r{toxinidir}/test-requirements.txt
commands = stestr run --slowest {posargs}
[testenv:py37]
basepython = python3.7
deps = -r{toxinidir}/test-requirements.txt
commands = stestr run --slowest {posargs}
[testenv:py38]
basepython = python3.8
deps = -r{toxinidir}/test-requirements.txt
commands = stestr run --slowest {posargs}
[testenv:py39]
basepython = python3.9
deps = -r{toxinidir}/test-requirements.txt
commands = stestr run --slowest {posargs}
[testenv:py310]
basepython = python3.10
deps = -r{toxinidir}/test-requirements.txt
commands = stestr run --slowest {posargs}
[testenv:pep8]
basepython = python3
deps = flake8==3.9.2
charm-tools==2.8.3
commands = flake8 {posargs} src unit_tests
[testenv:func-target]
# Hack to get functional tests working in the charmcraft
# world. We should fix this.
basepython = python3
passenv = HOME TERM CS_* OS_* TEST_*
deps = -r{toxinidir}/src/test-requirements.txt
changedir = {toxinidir}/src
commands =
bash -c "if [ ! -f ../*.charm ]; then echo 'Charm does not exist. Run tox -e build'; exit 1; fi"
tox --version
tox -e func-target {posargs}
[testenv:cover]
# Technique based heavily upon
# https://github.com/openstack/nova/blob/master/tox.ini