Refactor for credential helper

[hopkiw]

Using native python libraries is introducing a serious dependency management risk due to the state of python environments we want to integrate with. To remove the burden of the vendored packages and associated patches, include and call a binary credential helper. The python plugin code is still responsible for parsing the config and updating the repository object headers, but detecting credentials and generating tokens is offloaded to the helper.

Tested builds and installed on RHEL7 and RHEL8 hosts to test authenticated repo access. No config change was required when using these.

dnf-plugin-artifact-registry:

Name        : dnf-plugin-artifact-registry
Epoch       : 1
Version     : 1testing
Release     : g1.el8
Architecture: x86_64
Install Date: (not installed)
Group       : Unspecified
Size        : 5247647
License     : ASL 2.0
Signature   : (none)
Source RPM  : dnf-plugin-artifact-registry-1testing-g1.el8.src.rpm
Build Date  : Wed 14 Dec 2022 08:52:47 PM UTC
Build Host  : inst-build-pkg-el8-build-package-qsl6d.c.<redact>.internal
Relocations : (not relocatable)
URL         : https://cloud.google.com/artifact-registry
Summary     : dnf plugin for Artifact Registry
Description :
Contains a dnf plugin for authenticated access to Artifact Registry repositories.
config(dnf-plugin-artifact-registry) = 1:1testing-g1.el8
dnf >= 1.0.0
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PartialHardlinkSets) <= 4.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsXz) <= 5.2-1
/etc/dnf/plugins/artifact-registry.conf
/usr/lib/python3.6/site-packages/dnf-plugins/__pycache__/artifact-registry.cpython-36.opt-1.pyc
/usr/lib/python3.6/site-packages/dnf-plugins/__pycache__/artifact-registry.cpython-36.pyc
/usr/lib/python3.6/site-packages/dnf-plugins/artifact-registry.py
/usr/libexec/ar-token
/usr/share/doc/dnf-plugin-artifact-registry
/usr/share/doc/dnf-plugin-artifact-registry/LICENSE

yum-plugin-artifact-registry:

Name        : yum-plugin-artifact-registry
Epoch       : 1
Version     : 1testing
Release     : g1.el7
Architecture: x86_64
Install Date: (not installed)
Group       : Unspecified
Size        : 5246846
License     : ASL 2.0
Signature   : (none)
Source RPM  : yum-plugin-artifact-registry-1testing-g1.el7.src.rpm
Build Date  : Wed 14 Dec 2022 08:37:55 PM UTC
Build Host  : inst-build-pkg-el7-build-package-yjws8.c.<redact>.internal
Relocations : (not relocatable)
URL         : https://cloud.google.com/artifact-registry
Summary     : Yum plugin for Artifact Registry
Description :
Contains a Yum plugin for authenticated access to Artifact Registry repositories.
config(yum-plugin-artifact-registry) = 1:1testing-g1.el7
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PartialHardlinkSets) <= 4.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
yum >= 3.0
rpmlib(PayloadIsXz) <= 5.2-1
/etc/yum/pluginconf.d/artifact-registry.conf
/usr/lib/yum-plugins/artifact-registry.py
/usr/lib/yum-plugins/artifact-registry.pyc
/usr/lib/yum-plugins/artifact-registry.pyo
/usr/libexec/ar-token
/usr/share/doc/yum-plugin-artifact-registry-1testing
/usr/share/doc/yum-plugin-artifact-registry-1testing/LICENSE

[hopkiw]

This presubmit is actually not valid. Amending in GoogleCloudPlatform/oss-test-infra#1855 Will rerun presubmits after this is merged.

[hopkiw]

/retest

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hopkiw, illfelder

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