Buildpack detection phase fetches older version of dotnet builders for a project migrated to DotNet Framework 8.0

[divaybansal]

I recently migrated a dotNet-based project, dotNet Framework, from v7.0 to v8.0. After the migration, the build using the buildpack failed. The failure was because the builder detected older versions of the dotNet core buildpacks as shown in the logs below.

Even after specifying the BP_DOTNET_FRAMEWORK_VERSION=8.0.0 the problem persists.

The build only works by passing a buildpack argument with the value "paketo-buildpacks/[email protected]". This defeats the purpose, as we would like the builder to detect the right buildpack automatically.

divaybansal@NTB-CH27 crm-service % pack build crm-service --builder paketobuildpacks/builder:base                               
base: Pulling from paketobuildpacks/builder
Digest: sha256:17ea21162ba8c7717d3ead3ee3836a368aced7f02f2e59658e52029bd6d149e7
Status: Image is up to date for paketobuildpacks/builder:base
base-cnb: Pulling from paketobuildpacks/run
Digest: sha256:1af9935d8987fd52b2266d288200c9482d1dd5529860bbf5bc2d248de1cb1a38
Status: Image is up to date for paketobuildpacks/run:base-cnb
0.16.5: Pulling from buildpacksio/lifecycle
Digest: sha256:6328c7b662c452111e39f1f5d5d097292d07c218ba4a873f0ad0c2cb67710869
Status: Image is up to date for buildpacksio/lifecycle:0.16.5
===> ANALYZING
[analyzer] Image with name "crm-service" not found
===> DETECTING
[detector] 7 of 12 buildpacks participating
[detector] paketo-buildpacks/ca-certificates            3.6.3
[detector] paketo-buildpacks/dotnet-core-sdk            0.13.17
[detector] paketo-buildpacks/icu                        0.6.14
[detector] paketo-buildpacks/dotnet-publish             0.12.15
[detector] paketo-buildpacks/dotnet-core-aspnet-runtime 0.3.19
[detector] paketo-buildpacks/dotnet-execute             0.14.17
[detector] paketo-buildpacks/environment-variables      4.5.3
===> RESTORING
[restorer] Restoring metadata for "paketo-buildpacks/dotnet-core-sdk:dotnet-core-sdk" from cache
[restorer] Restoring metadata for "paketo-buildpacks/dotnet-publish:nuget-cache" from cache
[restorer] Restoring data for "paketo-buildpacks/dotnet-core-sdk:dotnet-core-sdk" from cache
[restorer] Restoring data for "paketo-buildpacks/dotnet-publish:nuget-cache" from cache
[restorer] Restoring data for SBOM from cache

[builder] Buildpack contents: [. LICENSE NOTICE README.md bin bin/build bin/detect bin/helper bin/main buildpack.toml]
[builder] Buildpack: {API:0.7 Info:{ID:paketo-buildpacks/ca-certificates Name:Paketo Buildpack for CA Certificates Version:3.6.3 Homepage:https://github.com/paketo-buildpacks/ca-certificates ClearEnvironment:false Description:A Cloud Native Buildpack that adds custom CA certificates to a build and a created image Keywords:[ca-certificates trust certificates] Licenses:[{Type:Apache-2.0 URI:https://github.com/paketo-buildpacks/ca-certificates/blob/main/LICENSE}] SBOMFormats:[application/vnd.cyclonedx+json application/vnd.syft+json]} Path:/cnb/buildpacks/paketo-buildpacks_ca-certificates/3.6.3 Stacks:[{ID:io.buildpacks.stacks.bionic Mixins:[]} {ID:io.paketo.stacks.tiny Mixins:[]} {ID:* Mixins:[]}] Metadata:map[include-files:[LICENSE NOTICE README.md bin/build bin/detect bin/helper bin/main buildpack.toml] pre-package:scripts/build.sh]}
[builder] Layers: {Path:/layers/paketo-buildpacks_ca-certificates}
[builder] Platform contents: [. env env/BPE_ASPNETCORE_ENVIRONMENT env/BPE_BYPASS_POST_BUILD env/BP_DOTNET_FRAMEWORK_VERSION env/BP_DOTNET_PROJECT_PATH env/BP_LOG_LEVEL env/FTP_PROXY env/HTTPS_PROXY env/HTTP_PROXY env/NO_PROXY env/ftp_proxy env/http_proxy env/https_proxy env/no_proxy]
[builder] Platform Bindings: []
[builder] Platform Environment: map[BPE_ASPNETCORE_ENVIRONMENT:Development BPE_BYPASS_POST_BUILD:true BP_DOTNET_FRAMEWORK_VERSION:8.0.0 BP_DOTNET_PROJECT_PATH:./src/Etops.CRM.Api/ BP_LOG_LEVEL:DEBUG FTP_PROXY: HTTPS_PROXY: HTTP_PROXY: NO_PROXY: ftp_proxy: http_proxy: https_proxy: no_proxy:]
[builder] Persistent Metadata: map[]
[builder] Buildpack Plan: {Entries:[{Name:ca-certificates-helper Metadata:map[]}]}
[builder] Stack: io.buildpacks.stacks.bionic
[builder] 
[builder] Paketo Buildpack for CA Certificates 3.6.3
[builder]   https://github.com/paketo-buildpacks/ca-certificates
[builder] Result: {BOM: &{Entries:[{Name:helper Metadata:map[layer:helper names:[ca-certificates-helper] version:3.6.3] Launch:true Build:false}]}, Labels:[] Layers:[HelperLayerContributor] PersistentMetadata:map[] Processes:map[] Slices:[], Unmet:[]}
[builder] Check If Layer Restored -> tomlExists: %!s(bool=false), layerDirExists: %!s(bool=false), dirContents: [], cache: %!s(bool=false), build: %!s(bool=false)
[builder] Expected metadata: map[buildpackInfo:map[clear-env:false description:A Cloud Native Buildpack that adds custom CA certificates to a build and a created image homepage:https://github.com/paketo-buildpacks/ca-certificates id:paketo-buildpacks/ca-certificates keywords:[ca-certificates trust certificates] licenses:[map[type:Apache-2.0 uri:https://github.com/paketo-buildpacks/ca-certificates/blob/main/LICENSE]] name:Paketo Buildpack for CA Certificates sbom-formats:[application/vnd.cyclonedx+json application/vnd.syft+json] version:3.6.3] helperNames:[ca-certificates-helper]]
[builder] Actual metadata: map[]
[builder]   Launch Helper: Contributing to layer
[builder]     Creating /layers/paketo-buildpacks_ca-certificates/helper/exec.d/ca-certificates-helper
[builder] Writing Syft SBOM at /layers/paketo-buildpacks_ca-certificates/helper.sbom.syft.json: {Artifacts:[{ID:48b1458de6e5b5ba Name:helper Version:3.6.3 Type:UnknownPackage FoundBy:libpak Locations:[{Path:ca-certificates-helper}] Licenses:[Apache-2.0] Language: CPEs:[cpe:2.3:a:paketo-buildpacks/ca-certificates:ca-certificates-helper:3.6.3:*:*:*:*:*:*:*] PURL:pkg:generic/paketo-buildpacks/[email protected]}] Source:{Type:directory Target:/layers/paketo-buildpacks_ca-certificates/helper} Descriptor:{Name:syft Version:0.32.0} Schema:{Version:1.1.0 URL:https://raw.githubusercontent.com/anchore/syft/main/schema/json/schema-1.1.0.json}}
[builder] Writing layer env.build: /layers/paketo-buildpacks_ca-certificates/helper/env.build <= map[]
[builder] Writing layer env.launch: /layers/paketo-buildpacks_ca-certificates/helper/env.launch <= map[]
[builder] Writing layer env: /layers/paketo-buildpacks_ca-certificates/helper/env <= map[]
[builder] Writing layer profile.d: /layers/paketo-buildpacks_ca-certificates/helper/profile.d <= map[]
[builder] Writing layer metadata: /layers/paketo-buildpacks_ca-certificates/helper.toml <= {LayerTypes:{Build:false Cache:false Launch:true} Metadata:map[buildpackInfo:map[clear-env:false description:A Cloud Native Buildpack that adds custom CA certificates to a build and a created image homepage:https://github.com/paketo-buildpacks/ca-certificates id:paketo-buildpacks/ca-certificates keywords:[ca-certificates trust certificates] licenses:[map[type:Apache-2.0 uri:https://github.com/paketo-buildpacks/ca-certificates/blob/main/LICENSE]] name:Paketo Buildpack for CA Certificates sbom-formats:[application/vnd.cyclonedx+json application/vnd.syft+json] version:3.6.3] helperNames:[ca-certificates-helper]] Name:helper Path:/layers/paketo-buildpacks_ca-certificates/helper BuildEnvironment:map[] LaunchEnvironment:map[] SharedEnvironment:map[] Profile:map[] Exec:{Path:/layers/paketo-buildpacks_ca-certificates/helper/exec.d}}
[builder] Writing application metadata: /layers/paketo-buildpacks_ca-certificates/launch.toml <= {Labels:[] Processes:[] Slices:[] BOM:[{Name:helper Metadata:map[layer:helper names:[ca-certificates-helper] version:3.6.3] Launch:true Build:false}]}
[builder] Paketo Buildpack for .NET Core SDK 0.13.17
[builder]   Resolving .NET Core SDK version
[builder]     Candidate version sources (in priority order):
[builder]       BP_DOTNET_FRAMEWORK_VERSION -> "8.0.*"
[builder]       xxxx.CRM.Api.csproj        -> "8.0.*"
[builder] 
[builder] failed to satisfy "dotnet-sdk" dependency version constraint "8.0.*": no compatible versions on "io.buildpacks.stacks.bionic" stack. Supported versions are: [6.0.411, 7.0.305]
[builder] ERROR: failed to build: exit status 1
ERROR: failed to build: executing lifecycle: failed with status code: 51

[sophiewigmore]

Hey! We constantly release new builders with the latest versions of the buildpacks in them. Unfortunately, you're using the Bionic Base Builder, and per the repo (https://github.com/paketo-buildpacks/base-builder), we have archived and not updated it because Ubuntu 18.04 (Bionic) is out of support. As a result, we haven't update that builder in ages.
You have two options.

1. (100% the recommended option) Upgrade to the Jammy Base Builder (--builder paketobuildpacks/builder-jammy-base) which gets regularly updated.

2. (not recommended) Alternatively, if you NEED to stay on Bionic, you can use the Buildpackless Base Builder, which is also based on Bionic, but includes no buildpacks. Then, you can specify just the buildpack you need with the --buildpack paketo-buildpacks/dotnet-core flag in your pack command. I really wouldn't recommend this though, because it has also been archived and will contain potentially vulnerable packages.

[divaybansal]

Many thanks Sophie!! The solution you recommended works. We missed the deprecation of the bionic base image. In future, we will take care of it.