pip wheel bustes cache

# syntax=docker/dockerfile:experimental

FROM python:3.6-alpine AS ms-python-wheel

WORKDIR /src

RUN --mount=type=cache,id=apk,sharing=locked,target=/var/cache/apk ln -vs /var/cache/apk /etc/apk/cache && \
	apk add --update --virtual build-dependencies \
	gcc \
	build-base \
	libffi-dev \
	libressl-dev \
	postgresql-dev

COPY . /src/
RUN --mount=type=cache,id=wheel,sharing=locked,target=/root \
	pip wheel -e .

/usr/libexec/docker/cli-plugins/docker-buildx bake --progress plain -f .jenkins/docker-compose.images-base.1.yml -f .jenkins/buildx.images-base.1.yml flask-core

.jenkins/buildx.images-base.1.yml

  # Python-flask-core
  flask-core:
    build:
      context: ./.Flask-core
      dockerfile: buildx

.jenkins/docker-compose.images-base.1.yml

  flask-core:
    image: flask-core-wheel:${WHEEL_VERSION:-0.4}-${COMMIT_ID}
    build:
      context: ../.Flask-core
      dockerfile: Dockerfile

this is the 2nd run, after cache has been created from a previous successful build

Building Base Images
/usr/libexec/docker/cli-plugins/docker-buildx bake --progress plain -f .jenkins/docker-compose.images-base.1.yml -f .jenkins/buildx.images-base.1.yml
time="2019-07-28T13:47:28Z" level=error msg="Error parsing the serverURL" error="docker-credential-ecr-login can only be used with Amazon Elastic Container Registry." serverURL="https://index.docker.io/v1/"
#1 [internal] load .dockerignore
#1 transferring context: 50B done
#1 DONE 0.0s

#2 [internal] load build definition from buildx
#2 transferring dockerfile: 449B done
#2 DONE 0.0s

#3 resolve image config for docker.io/docker/dockerfile:experimental
#3 DONE 0.3s

#4 docker-image://docker.io/docker/dockerfile:experimental@sha256:9022e9111...
#4 CACHED

#5 [internal] load metadata for docker.io/library/python:3.6-alpine
time="2019-07-28T13:47:29Z" level=error msg="Error parsing the serverURL" error="docker-credential-ecr-login can only be used with Amazon Elastic Container Registry." serverURL="https://index.docker.io/v1/"
#5 DONE 0.3s

#6 [1/5] FROM docker.io/library/python:3.6-alpine@sha256:6073c91ab2c78220c1...
#6 DONE 0.0s

#9 [internal] load build context
#9 transferring context: 5.54kB done
#9 DONE 0.0s

#7 [2/5] WORKDIR /src
#7 CACHED

#8 [3/5] RUN --mount=type=cache,id=apk,sharing=locked,target=/var/cache/apk...
#8 CACHED

#10 [4/5] COPY . /src/
#10 CACHED

#11 [5/5] RUN --mount=type=cache,id=wheel,sharing=locked,target=/root 	pip w...
#11 1.280 Obtaining file:///src
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#11 3.739   Installing build dependencies: started
#11 4.989   Installing build dependencies: finished with status 'done'
#11 4.992   Getting requirements to build wheel: started
#11 5.218   Getting requirements to build wheel: finished with status 'done'
#11 5.220     Preparing wheel metadata: started
#11 5.880     Preparing wheel metadata: finished with status 'done'
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#11 6.528 Collecting docopt==0.4.0 (from Flask-Core==0.4.0)
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#11 10.04   Using cached https://files.pythonhosted.org/packages/08/ca/582442cad71504a1514a2f053006c8bb128844133d6076a4df17117545fa/Flask_SQLAlchemy-2.4.0-py2.py3-none-any.whl
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#11 13.51 Collecting mysql-connector-python==8.0.16 (from Flask-Core==0.4.0)
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#11 15.47 Collecting pyScss==1.3.5 (from Flask-Core==0.4.0)
#11 15.56   Using cached https://files.pythonhosted.org/packages/01/7b/c6bfb2515ed08cbfb76b0e72254f24caf76f25676d72024837a85a1e68f5/pyScss-1.3.5.tar.gz
#11 15.76 Collecting python-daemon==2.2.3 (from Flask-Core==0.4.0)
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#11 19.04 Skipping amqp, due to already being wheel.
#11 19.04 Skipping asn1crypto, due to already being wheel.
#11 19.04 Skipping beautifulsoup4, due to already being wheel.
#11 19.04 Skipping bugsnag, due to already being wheel.
#11 19.04 Skipping certifi, due to already being wheel.
#11 19.04 Skipping cffi, due to already being wheel.
#11 19.04 Skipping chardet, due to already being wheel.
#11 19.04 Skipping Click, due to already being wheel.
#11 19.04 Skipping cssutils, due to already being wheel.
#11 19.04 Skipping docutils, due to already being wheel.
#11 19.04 Skipping Flask, due to already being wheel.
#11 19.04 Skipping Flask-SQLAlchemy, due to already being wheel.
#11 19.04 Skipping Flask-WTF, due to already being wheel.
#11 19.04 Skipping gevent-socketio-hartwork, due to already being wheel.
#11 19.04 Skipping gevent-websocket, due to already being wheel.
#11 19.04 Skipping html5lib, due to already being wheel.
#11 19.04 Skipping idna, due to already being wheel.
#11 19.04 Skipping itsdangerous, due to already being wheel.
#11 19.04 Skipping Jinja2, due to already being wheel.
#11 19.04 Skipping kombu, due to already being wheel.
#11 19.04 Skipping lockfile, due to already being wheel.
#11 19.04 Skipping mailtrap, due to already being wheel.
#11 19.04 Skipping marshmallow, due to already being wheel.
#11 19.04 Skipping marshmallow-sqlalchemy, due to already being wheel.
#11 19.05 Skipping mock, due to already being wheel.
#11 19.05 Skipping mongomock, due to already being wheel.
#11 19.05 Skipping mysql-connector-python, due to already being wheel.
#11 19.05 Skipping nose, due to already being wheel.
#11 19.05 Skipping passlib, due to already being wheel.
#11 19.05 Skipping pbr, due to already being wheel.
#11 19.05 Skipping postmarker, due to already being wheel.
#11 19.05 Skipping protobuf, due to already being wheel.
#11 19.05 Skipping pycparser, due to already being wheel.
#11 19.05 Skipping PyMySQL, due to already being wheel.
#11 19.05 Skipping python-daemon, due to already being wheel.
#11 19.05 Skipping python-dateutil, due to already being wheel.
#11 19.05 Skipping python-dotenv, due to already being wheel.
#11 19.05 Skipping python-statsd, due to already being wheel.
#11 19.05 Skipping pytz, due to already being wheel.
#11 19.05 Skipping requests, due to already being wheel.
#11 19.05 Skipping six, due to already being wheel.
#11 19.05 Skipping soupsieve, due to already being wheel.
#11 19.05 Skipping urllib3, due to already being wheel.
#11 19.05 Skipping vine, due to already being wheel.
#11 19.05 Skipping webencodings, due to already being wheel.
#11 19.05 Skipping WebOb, due to already being wheel.
#11 19.05 Skipping Werkzeug, due to already being wheel.
#11 19.05 Skipping WTForms, due to already being wheel.
#11 19.05 Skipping setuptools, due to already being wheel.
#11 19.05 Building wheels for collected packages: Flask-Core, amqplib, anyjson, billiard, blinker, configobj, cryptography, cssmin, cssprefixer, docopt, Flask-Assets, flask-mongoengine, Flask-Script, gevent, greenlet, Logbook, loggly-python-handler, mandrill, MarkupSafe, mongoengine, psutil, psycopg2, pymongo, pyScss, PyYAML, requests-futures, sentinels, speaklater, SQLAlchemy, webassets
#11 19.05   Building wheel for Flask-Core (setup.py): started
#11 19.40   Building wheel for Flask-Core (setup.py): finished with status 'done'
#11 19.40   Stored in directory: /src
#11 19.41   Building wheel for amqplib (setup.py): started
#11 20.34   Building wheel for amqplib (setup.py): finished with status 'done'
#11 20.34   Stored in directory: /src
#11 20.34   Building wheel for anyjson (setup.py): started
#11 20.86   Building wheel for anyjson (setup.py): finished with status 'done'
#11 20.86   Stored in directory: /src
#11 20.86   Building wheel for billiard (setup.py): started
#11 21.11   Building wheel for billiard (setup.py): finished with status 'done'
#11 21.11   Stored in directory: /src
#11 21.11   Building wheel for blinker (setup.py): started
#11 21.33   Building wheel for blinker (setup.py): finished with status 'done'
#11 21.33   Stored in directory: /src
#11 21.33   Building wheel for configobj (setup.py): started
#11 21.55   Building wheel for configobj (setup.py): finished with status 'done'
#11 21.55   Stored in directory: /src
#11 21.55   Building wheel for cryptography (PEP 517): started
#11 41.32   Building wheel for cryptography (PEP 517): finished with status 'done'
#11 41.32   Stored in directory: /src
#11 41.32   Building wheel for cssmin (setup.py): started
#11 41.53   Building wheel for cssmin (setup.py): finished with status 'done'
#11 41.53   Stored in directory: /src
#11 41.53   Building wheel for cssprefixer (setup.py): started
#11 41.74   Building wheel for cssprefixer (setup.py): finished with status 'done'
#11 41.74   Stored in directory: /src
#11 41.74   Building wheel for docopt (setup.py): started
#11 41.95   Building wheel for docopt (setup.py): finished with status 'done'
#11 41.95   Stored in directory: /src
#11 41.95   Building wheel for Flask-Assets (setup.py): started
#11 42.17   Building wheel for Flask-Assets (setup.py): finished with status 'done'
#11 42.17   Stored in directory: /src
#11 42.17   Building wheel for flask-mongoengine (setup.py): started
#11 42.45   Building wheel for flask-mongoengine (setup.py): finished with status 'done'
#11 42.45   Stored in directory: /src
#11 42.45   Building wheel for Flask-Script (setup.py): started
#11 42.66   Building wheel for Flask-Script (setup.py): finished with status 'done'
#11 42.67   Stored in directory: /src
#11 42.67   Building wheel for gevent (setup.py): started
#11 103.4   Building wheel for gevent (setup.py): still running...
#11 124.4   Building wheel for gevent (setup.py): finished with status 'done'
#11 124.4   Stored in directory: /src
#11 124.4   Building wheel for greenlet (setup.py): started
#11 125.1   Building wheel for greenlet (setup.py): finished with status 'done'
#11 125.1   Stored in directory: /src
#11 125.1   Building wheel for Logbook (setup.py): started
#11 125.4   Building wheel for Logbook (setup.py): finished with status 'done'
#11 125.4   Stored in directory: /src
#11 125.4   Building wheel for loggly-python-handler (setup.py): started
#11 125.6   Building wheel for loggly-python-handler (setup.py): finished with status 'done'
#11 125.6   Stored in directory: /src
#11 125.6   Building wheel for mandrill (setup.py): started
#11 125.8   Building wheel for mandrill (setup.py): finished with status 'done'
#11 125.8   Stored in directory: /src
#11 125.8   Building wheel for MarkupSafe (setup.py): started
#11 126.2   Building wheel for MarkupSafe (setup.py): finished with status 'done'
#11 126.2   Stored in directory: /src
#11 126.2   Building wheel for mongoengine (setup.py): started
#11 129.2   Building wheel for mongoengine (setup.py): finished with status 'done'
#11 129.2   Stored in directory: /src
#11 129.2   Building wheel for psutil (setup.py): started
#11 130.2   Building wheel for psutil (setup.py): finished with status 'done'
#11 130.2   Stored in directory: /src
#11 130.2   Building wheel for psycopg2 (setup.py): started
#11 136.4   Building wheel for psycopg2 (setup.py): finished with status 'done'
#11 136.4   Stored in directory: /src
#11 136.4   Building wheel for pymongo (setup.py): started
#11 138.8   Building wheel for pymongo (setup.py): finished with status 'done'
#11 138.8   Stored in directory: /src
#11 138.8   Building wheel for pyScss (setup.py): started
#11 139.1   Building wheel for pyScss (setup.py): finished with status 'done'
#11 139.1   Stored in directory: /src
#11 139.1   Building wheel for PyYAML (setup.py): started
#11 139.4   Building wheel for PyYAML (setup.py): finished with status 'done'
#11 139.4   Stored in directory: /src
#11 139.4   Building wheel for requests-futures (setup.py): started
#11 139.6   Building wheel for requests-futures (setup.py): finished with status 'done'
#11 139.6   Stored in directory: /src
#11 139.6   Building wheel for sentinels (setup.py): started
#11 139.8   Building wheel for sentinels (setup.py): finished with status 'done'
#11 139.8   Stored in directory: /src
#11 139.8   Building wheel for speaklater (setup.py): started
#11 140.0   Building wheel for speaklater (setup.py): finished with status 'done'
#11 140.0   Stored in directory: /src
#11 140.0   Building wheel for SQLAlchemy (setup.py): started
#11 141.1   Building wheel for SQLAlchemy (setup.py): finished with status 'done'
#11 141.1   Stored in directory: /src
#11 141.1   Building wheel for webassets (setup.py): started
#11 141.3   Building wheel for webassets (setup.py): finished with status 'done'
#11 141.3   Stored in directory: /src
#11 141.3 Successfully built Flask-Core amqplib anyjson billiard blinker configobj cryptography cssmin cssprefixer docopt Flask-Assets flask-mongoengine Flask-Script gevent greenlet Logbook loggly-python-handler mandrill MarkupSafe mongoengine psutil psycopg2 pymongo pyScss PyYAML requests-futures sentinels speaklater SQLAlchemy webassets
#11 141.6 WARNING: You are using pip version 19.1.1, however version 19.2.1 is available.
#11 141.6 You should consider upgrading via the 'pip install --upgrade pip' command.
#11 DONE 141.7s

#12 exporting to image
#12 exporting layers
#12 exporting layers 0.2s done
#12 writing image sha256:746048384e8d72ec622e1331a469752d132f43c5657ab05aff27740cba65efec done

Start by reproducing the Dockerfile example with the .jenkins/buildx.images-base.1.yml and .jenkins/docker-compose.images-base.1.yml files using the shown buildx bake command. Compare the first and second builds, focusing on the pip wheel cache mount and the cached build steps. Done means the previously created wheel cache is reused on the second build without the reported cache-busting behavior.