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Bake: Cache of child target gets invalidated by COPY in parentΒ #2144

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#2265
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Bake: Cache of child target gets invalidated by COPY in parent#2144
#2265
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area/buildkitkind/bugSomething isn't working

Description

@flozzone
flozzone
opened on Nov 29, 2023

Contributing guidelines

I've found a bug and checked that ...

  • ... the documentation does not mention anything about my problem
  • ... there are no open or closed issues that are related to my problem

Description

Building cached chained image with bake invalidates child layer caches if parent contains a COPY command. Running the example bake build a second time results in different image Ids for image2 images (A vs B), even though first run cached layers for image2.

  • When removing the COPY line in 1.Dockerfile both image2 (A and B) are the same.
  • All preceding layers from image1 are always the same
  • Setting SOURCE_DATE_EPOCH=1 has no impact
  • Setting BUILDX_NO_DEFAULT_ATTESTATIONS=1 has no impact
  • Setting BUILDX_GIT_INFO=0 has no impact
  • Using different cache mode flags mode=min or mode=max has no impact

Possibly related to:

Minimal reproducer

Reproducer: https://github.com/flozzone/docker-bake-invalidate-child-cache builds the above bake file twice using a common cache between runs A and B:

prune_cache
recreate_builder
build "${RUN_ID}-A"
recreate_builder
build "${RUN_ID}-B"

compare_image "image1"
compare_image "image2"

Usage: ./test.sh RUN_ID

  • RUN_ID: ID of the run. Should be changed when running multiple times. Used to organize debug output.

A refers to the images built from first run
B refers to the images built from second run

Usage example:

$ ./test.sh 4

...
/tmp/docker-test-run/4-A-bake.json
/tmp/docker-test-run/4-A-buildkitd.log
/tmp/docker-test-run/4-A.json
/tmp/docker-test-run/4-B-bake.json
/tmp/docker-test-run/4-B-buildkitd.log
/tmp/docker-test-run/4-B.json
βœ…  image1:4-A and docker-test1:4-B images are the same
❌  image2:4-A and docker-test2:4-B images are not the same

Expected behaviour

The second build should output the same image2 image Id as the first run.

βœ…  image1:1-A and image1:1-B images are the same
βœ…  image2:1-A and image2:1-B images are the same

Actual behaviour

The second build outputs a different image2 image Id than the previous run and layers for image2 are not re-used.

βœ…  image1:1-A and image1:1-B images are the same
❌  image2:1-A and image2:1-B images are not the same

Buildx version

github.com/docker/buildx v0.12.0 542e5d810e4a1a155684f5f3c5bd7e797632a12f

Other versions

  • docker version: Docker version 24.0.7, build afdd53b
  • docker buildx version: github.com/docker/buildx v0.12.0 542e5d810e4a1a155684f5f3c5bd7e797632a12f
  • buildkitd image: moby/buildkit:v0.12.3
  • driver: docker-container
  • buildkitd-flags: --debug
  • cache type: local, no additional cache options

Docker info

Client: Docker Engine - Community
 Version:    24.0.7
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.12.0
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.21.0
    Path:     /usr/libexec/docker/cli-plugins/docker-compose
WARNING: Plugin "/usr/libexec/docker/cli-plugins/docker-buildx.bak" is not valid: plugin candidate "buildx.bak" did not match "^[a-z][a-z0-9]*$"

Server:
 Containers: 3
  Running: 3
  Paused: 0
  Stopped: 0
 Images: 6
 Server Version: 24.0.7
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: d8f198a4ed8892c764191ef7b3b06d8a2eeb5c7f
 runc version: v1.1.10-0-g18a0cb0
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.5.0-13-generic
 Operating System: Ubuntu 23.10
 OSType: linux
 Architecture: x86_64
 CPUs: 16
 Total Memory: 27.22GiB
 Name: [ANONYMIZED]
 ID: [ANONYMIZED]
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

Builders list

CNAME/NODE    DRIVER/ENDPOINT                                                                                    STATUS   BUILDKIT             PLATFORMS
builder *    docker-container                                                                                                                 
  builder0   unix:///var/run/docker.sock                                                                        running  v0.12.3              linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/386                   
default      docker                                                                                                                           
  default    default                                                                                            running  v0.11.7+d3e6c1360f6e linux/amd64, linux/amd64/v2, linux/amd64/v3, linux/386

Configuration

1.Dockerfile

# syntax=docker/dockerfile:1
FROM quay.io/bashell/alpine-python:3
COPY test-copy.txt test-copy.txt

test-copy.txt

2.Dockerfile

# syntax=docker/dockerfile:1
FROM baseapp
RUN echo "test" > test

docker-bake.hcl

group "default" {
  targets = [ "image1", "image2"]
}

variable "TAG" {}

variable "CACHE_DIR" {
  default = "/tmp/docker-test-cache"
}

target "image1" {
  context    = "."
  dockerfile = "1.Dockerfile"
  cache-to   = ["type=local,dest=${CACHE_DIR}/cache1"]
  cache-from = ["type=local,src=${CACHE_DIR}/cache1"]
  tags       = ["image1:${TAG}"]
}

target "image2" {
  context    = "."
  dockerfile = "2.Dockerfile"
  contexts   = {
    baseapp = "target:image1"
  }
  cache-to   = ["type=local,dest=${CACHE_DIR}/cache2"]
  cache-from = ["type=local,src=${CACHE_DIR}/cache2"]
  tags       = ["image2:${TAG}"]
}

Build logs

time="2023-11-29T12:25:15Z" level=info msg="auto snapshotter: using overlayfs"
time="2023-11-29T12:25:15Z" level=warning msg="using host network as the default"
time="2023-11-29T12:25:15Z" level=info msg="found worker \"q8t4u75a02iah4g29l4f2i5i9\", labels=map[org.mobyproject.buildkit.worker.executor:oci org.mobyproject.buildkit.worker.hostname:7462f1f4096b org.mobyproject.buildkit.worker.network:host org.mobyproject.buildkit.worker.oci.process-mode:sandbox org.mobyproject.buildkit.worker.selinux.enabled:false org.mobyproject.buildkit.worker.snapshotter:overlayfs], platforms=[linux/amd64 linux/amd64/v2 linux/amd64/v3 linux/386]"
time="2023-11-29T12:25:15Z" level=warning msg="skipping containerd worker, as \"/run/containerd/containerd.sock\" does not exist"
time="2023-11-29T12:25:15Z" level=info msg="found 1 workers, default=\"q8t4u75a02iah4g29l4f2i5i9\""
time="2023-11-29T12:25:15Z" level=warning msg="currently, only the default worker can be used."
time="2023-11-29T12:25:15Z" level=info msg="running server on /run/buildkit/buildkitd.sock"
time="2023-11-29T12:25:15Z" level=debug msg="session started" spanID=808f2b0860d0b17a traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="session finished: <nil>" spanID=808f2b0860d0b17a traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="session started" spanID=5a8c51d53c0b9a04 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="skipping invalid cache export mode: " spanID=0b6fd5089b26248f traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="new ref for local: 7pejsy4f82gjt8dc05z2362j6" span="[internal] load build definition from 1.Dockerfile" spanID=20e61815d05e5bf3 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="diffcopy took: 1.956955ms" span="[internal] load build definition from 1.Dockerfile" spanID=ce5800c7117928fc traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="saved 7pejsy4f82gjt8dc05z2362j6 as dockerfile:dockerfile:docker-bake-invalidate-child-cache:626dcb2aac370ce5" span="[internal] load build definition from 1.Dockerfile" spanID=20e61815d05e5bf3 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg=resolving host=registry-1.docker.io spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="do request" host=registry-1.docker.io request.header.accept="application/vnd.docker.distribution.manifest.v2+json, application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.oci.image.index.v1+json, */*" request.header.user-agent=buildkit/v0.12 request.method=HEAD spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/1"
time="2023-11-29T12:25:15Z" level=debug msg="fetch response received" host=registry-1.docker.io response.header.content-length=160 response.header.content-type=application/json response.header.date="Wed, 29 Nov 2023 12:25:15 GMT" response.header.docker-distribution-api-version=registry/2.0 response.header.docker-ratelimit-source=62.178.188.41 response.header.strict-transport-security="max-age=31536000" response.header.www-authenticate="Bearer realm=\"https://auth.docker.io/token\",service=\"registry.docker.io\",scope=\"repository:docker/dockerfile:pull\"" response.status="401 Unauthorized" spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/1"
time="2023-11-29T12:25:15Z" level=debug msg=Unauthorized header="Bearer realm=\"https://auth.docker.io/token\",service=\"registry.docker.io\",scope=\"repository:docker/dockerfile:pull\"" host=registry-1.docker.io spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:15Z" level=debug msg="do request" host=registry-1.docker.io request.header.accept="application/vnd.docker.distribution.manifest.v2+json, application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.oci.image.index.v1+json, */*" request.header.user-agent=buildkit/v0.12 request.method=HEAD spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/1"
time="2023-11-29T12:25:16Z" level=debug msg="fetch response received" host=registry-1.docker.io response.header.content-length=8404 response.header.content-type=application/vnd.oci.image.index.v1+json response.header.date="Wed, 29 Nov 2023 12:25:16 GMT" response.header.docker-content-digest="sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021" response.header.docker-distribution-api-version=registry/2.0 response.header.docker-ratelimit-source=62.178.188.41 response.header.etag="\"sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021\"" response.header.strict-transport-security="max-age=31536000" response.status="200 OK" spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/1"
time="2023-11-29T12:25:16Z" level=debug msg=resolved desc.digest="sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021" host=registry-1.docker.io spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg=fetch digest="sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021" mediatype=application/vnd.oci.image.index.v1+json size=8404 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg="do request" digest="sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021" mediatype=application/vnd.oci.image.index.v1+json request.header.accept="application/vnd.oci.image.index.v1+json, */*" request.header.user-agent=buildkit/v0.12 request.method=GET size=8404 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021"
time="2023-11-29T12:25:16Z" level=debug msg="fetch response received" digest="sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021" mediatype=application/vnd.oci.image.index.v1+json response.header.content-length=8404 response.header.content-type=application/vnd.oci.image.index.v1+json response.header.date="Wed, 29 Nov 2023 12:25:16 GMT" response.header.docker-content-digest="sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021" response.header.docker-distribution-api-version=registry/2.0 response.header.docker-ratelimit-source=62.178.188.41 response.header.etag="\"sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021\"" response.header.strict-transport-security="max-age=31536000" response.status="200 OK" size=8404 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021"
time="2023-11-29T12:25:16Z" level=debug msg=fetch digest="sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e" mediatype=application/vnd.oci.image.manifest.v1+json size=482 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg="do request" digest="sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e" mediatype=application/vnd.oci.image.manifest.v1+json request.header.accept="application/vnd.oci.image.manifest.v1+json, */*" request.header.user-agent=buildkit/v0.12 request.method=GET size=482 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e"
time="2023-11-29T12:25:16Z" level=debug msg="fetch response received" digest="sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e" mediatype=application/vnd.oci.image.manifest.v1+json response.header.content-length=482 response.header.content-type=application/vnd.oci.image.manifest.v1+json response.header.date="Wed, 29 Nov 2023 12:25:16 GMT" response.header.docker-content-digest="sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e" response.header.docker-distribution-api-version=registry/2.0 response.header.docker-ratelimit-source=62.178.188.41 response.header.etag="\"sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e\"" response.header.strict-transport-security="max-age=31536000" response.status="200 OK" size=482 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/manifests/sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e"
time="2023-11-29T12:25:16Z" level=debug msg=fetch digest="sha256:a17ee7fff8f5e97b974f5b48f51647d2cf28d543f2aa6c11aaa0ea431b44bb89" mediatype=application/vnd.oci.image.config.v1+json size=1271 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg="do request" digest="sha256:a17ee7fff8f5e97b974f5b48f51647d2cf28d543f2aa6c11aaa0ea431b44bb89" mediatype=application/vnd.oci.image.config.v1+json request.header.accept="application/vnd.oci.image.config.v1+json, */*" request.header.user-agent=buildkit/v0.12 request.method=GET size=1271 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/blobs/sha256:a17ee7fff8f5e97b974f5b48f51647d2cf28d543f2aa6c11aaa0ea431b44bb89"
time="2023-11-29T12:25:16Z" level=debug msg="fetch response received" digest="sha256:a17ee7fff8f5e97b974f5b48f51647d2cf28d543f2aa6c11aaa0ea431b44bb89" mediatype=application/vnd.oci.image.config.v1+json response.header.accept-ranges=bytes response.header.age=119440 response.header.cache-control="public, max-age=14400" response.header.cf-cache-status=HIT response.header.cf-ray=82dad51848d0c282-VIE response.header.connection=keep-alive response.header.content-length=1271 response.header.content-type=application/octet-stream response.header.date="Wed, 29 Nov 2023 12:25:16 GMT" response.header.etag="\"c672f7caa35401d1206dcc25158dabb0\"" response.header.expires="Wed, 29 Nov 2023 16:25:16 GMT" response.header.last-modified="Wed, 12 Jul 2023 22:22:37 GMT" response.header.server=cloudflare response.header.vary=Accept-Encoding response.header.x-amz-id-2="gc9J991urP+gxTR1KHhg5WXO8Sf6zQ5rSGDh8bVwT2R1d01hlyewR1PnMk8WaJ0jfuAil8ZXCSo=" response.header.x-amz-request-id=4QMG0HCMW1GT1V5T response.header.x-amz-server-side-encryption=AES256 response.header.x-amz-version-id=EhNMISiBv2LVkOSoeh1cNpabFCp6QxVB response.status="200 OK" size=1271 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/blobs/sha256:a17ee7fff8f5e97b974f5b48f51647d2cf28d543f2aa6c11aaa0ea431b44bb89"
time="2023-11-29T12:25:16Z" level=debug msg=fetch digest="sha256:ac85f380a63b13dfcefa89046420e1781752bab202122f8f50032edf31be0021" mediatype=application/vnd.oci.image.index.v1+json size=8404 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg=fetch digest="sha256:657fcc512c7369f4cb3d94ea329150f8daf626bc838b1a1e81f1834c73ecc77e" mediatype=application/vnd.oci.image.manifest.v1+json size=482 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg=fetch digest="sha256:a17ee7fff8f5e97b974f5b48f51647d2cf28d543f2aa6c11aaa0ea431b44bb89" mediatype=application/vnd.oci.image.config.v1+json size=1271 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg=fetch digest="sha256:9d9c93f4b00be908ab694a4df732570bced3b8a96b7515d70ff93402179ad232" mediatype=application/vnd.oci.image.layer.v1.tar+gzip size=11796420 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94
time="2023-11-29T12:25:16Z" level=debug msg="do request" digest="sha256:9d9c93f4b00be908ab694a4df732570bced3b8a96b7515d70ff93402179ad232" mediatype=application/vnd.oci.image.layer.v1.tar+gzip request.header.accept="application/vnd.oci.image.layer.v1.tar+gzip, */*" request.header.user-agent=containerd/1.7.2+unknown request.method=GET size=11796420 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/blobs/sha256:9d9c93f4b00be908ab694a4df732570bced3b8a96b7515d70ff93402179ad232"
time="2023-11-29T12:25:17Z" level=debug msg="fetch response received" digest="sha256:9d9c93f4b00be908ab694a4df732570bced3b8a96b7515d70ff93402179ad232" mediatype=application/vnd.oci.image.layer.v1.tar+gzip response.header.accept-ranges=bytes response.header.age=1837669 response.header.cache-control="public, max-age=14400" response.header.cf-cache-status=HIT response.header.cf-ray=82dad5198a4cc282-VIE response.header.connection=keep-alive response.header.content-length=11796420 response.header.content-type=application/octet-stream response.header.date="Wed, 29 Nov 2023 12:25:17 GMT" response.header.etag="\"7900e017752b00e0a6c9003273d20135\"" response.header.expires="Wed, 29 Nov 2023 16:25:17 GMT" response.header.last-modified="Wed, 12 Jul 2023 22:22:31 GMT" response.header.server=cloudflare response.header.vary=Accept-Encoding response.header.x-amz-id-2="QiW7XfAGAMQQRdQLfSLsX8AU2GFAJJVSAtGkXIwA0BzXyJeD4iECuugkfkG4KEhI0pnVSXUSYAU=" response.header.x-amz-request-id=MA34CM7R52425CF2 response.header.x-amz-server-side-encryption=AES256 response.header.x-amz-version-id=chJkGx1pzfDz_MnqTz_BpSJLzn61zGA2 response.status="200 OK" size=11796420 spanID=2de48becf6dab694 traceID=a402701ede544afad1e165ab932fcf94 url="https://registry-1.docker.io/v2/docker/dockerfile/blobs/sha256:9d9c93f4b00be908ab694a4df732570bced3b8a96b7515d70ff93402179ad232"
time="2023-11-29T12:25:17Z" level=debug msg="using pigz for decompression"
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time="2023-11-29T12:25:20Z" level=debug msg="> creating 216y6cl1icy8vpyplu63gzf23 [/bin/sh -c echo \"test\" > test]" span="[1/2] RUN echo \"test\" > test" spanID=fa831eec49e5555f traceID=a402701ede544afad1e165ab932fcf94
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Activity

  1. flozzone
    added
    status/triage
    on Nov 29, 2023
  2. flozzone
    changed the title [-]Bake: Cache of child target gets invalidated by copy in parent[/-] [+]Bake: Cache of child target gets invalidated by COPY in parent[/+] on Nov 29, 2023
  3. tonistiigi
    added
    kind/bugSomething isn't working
    area/buildkit
    and removed
    status/triage
    on Dec 2, 2023

  4. tonistiigi commented on Dec 2, 2023

    @tonistiigi
    tonistiigi
    on Dec 2, 2023
    Member

    I've confirmed this. Not so clear what might cause this. The issue is likely on buildkit side but let's keep it here for now, as the reproducer is with bake.

  5. tonistiigi commented on Dec 2, 2023

    @tonistiigi
    tonistiigi
    on Dec 2, 2023
    Member

    A data point that if COPY test-copy.txt test-copy.txt is replaced with RUN apk add git in first Dockerfile then it doesn't seem to reproduce anymore.

  6. flozzone commented on Dec 2, 2023

    @flozzone
    flozzone
    on Dec 2, 2023
    Author

    And in any case both the parent image1 always have the same ID between both runs A and B. Even if image1 has a COPY command. So image1 doesn't change at all, still a COPY in it causes the image2 target to not use the cache.

    I've now tried with older versions of buildkit down to v0.7.2, but the problem stays. (Could not test with v0.5.1 anymore, because of a change in how cache files are stored)

  7. flozzone commented on Dec 2, 2023

    @flozzone
    flozzone
    on Dec 2, 2023
    Author

    Passing a static image target to image2 baseapp context docker-image://alpine causes the image IDs of both runs to match again.

  8. flozzone commented on Dec 9, 2023

    @flozzone
    flozzone
    on Dec 9, 2023
    Author

    @tonistiigi how can I further debug this? If you say that its caused by buildkit, then I should be able to reproduce it with buildkit too. Do you have any hints on how to implement a minimal reproducer based on buildkit only?

  9. jedevc commented on Dec 11, 2023

    @jedevc
    jedevc
    on Dec 11, 2023
    Collaborator

    @flozzone the right way to reproduce in buildkit would probably be in an integration test. See https://github.com/moby/buildkit/blob/master/client/client_test.go, for the other tests, and https://github.com/moby/buildkit/blob/master/.github/CONTRIBUTING.md#run-the-unit--and-integration-tests for instructions on running them.

    To test if a layer is cached, the general way we do this is to read from /dev/random:
    https://github.com/moby/buildkit/blob/4ab32be0cc61c46875054bfbc4d819e1135f1f5a/client/client_test.go#L5036-L5037.

    Capturing the exact circumstances the bug happens under might be a bit tricky - you might need to read through buildx's bake code to make sure to do the same number of SolveOpts that bake does.

  10. kmontg commented on Jan 9, 2024

    @kmontg
    kmontg
    on Jan 9, 2024

    I'm also facing this exact issue. The COPY instruction in the parent image seems to invalidate the cache (after a prune) for child images, even when using a separate cache backend.

    I've added my own steps to reproduce in https://github.com/kmontg/bake-cache-issue.

    This only seems to be a problem on the first build after a cache purge (even with a specified alternative cache backend).

  11. flozzone commented on Feb 15, 2024

    @flozzone
    flozzone
    on Feb 15, 2024
    Author

    That seems to be really minimal @kmontg πŸ‘

    @jedevc I completely agree with you that a integration test would be the way to go for this issue here. But as you already described this can be bit tricky and I don't have the possibilities to dive into the codebase. I don't even know where to start with a buildkit based reproducer, since this issue involves chained builds and it's not really clear to me how to realize this in buildkit.

    I don't know why this issue has not yet attracted more attention, because buildkit advertises caching as an important feature "concurrent, cache-efficient, and Dockerfile-agnostic builder toolkit".

    @jedevc , @tonistiigi do you have any suggestions on how to progress here? I will probably not be able to come up with an integration test, but @tonistiigi was able to reproduce this bug and confirmed it.

    Should we move this issue to buildkit repo, but still keep the bake based reproducer, preferably the one from @kmontg https://github.com/kmontg/bake-cache-issue

  12. tonistiigi commented on Feb 21, 2024

    @tonistiigi
    tonistiigi
    on Feb 21, 2024
    Member

    This specific issue should be fixed with #2265 , but there is a more general issue that is causing it, tracked in moby/buildkit#4674 .

  13. crazy-max
    closed this as completedin #2265on Feb 21, 2024
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