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[GH-ISSUE #2080] `runs-on` does not accept array expressions #996

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opened 2026-03-01 21:48:03 +03:00 by kerem · 1 comment

kerem commented

2026-03-01 21:48:03 +03:00

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Originally created by @jenseng on GitHub (Nov 8, 2023).
Original GitHub issue: https://github.com/nektos/act/issues/2080

Bug report info

act version:            0.2.53
GOOS:                   darwin
GOARCH:                 arm64
NumCPU:                 12
Docker host:            DOCKER_HOST environment variable is not set
Sockets found:
	/var/run/docker.sock
	$HOME/.docker/run/docker.sock
Config files:
	/Users/jonj/.actrc:
		-P ubuntu-latest=node:16-buster-slim
		-P ubuntu-22.04=node:16-bullseye-slim
		-P ubuntu-20.04=node:16-buster-slim
		-P ubuntu-18.04=node:16-buster-slim
Build info:
	Go version:            go1.21.3
	Module path:           command-line-arguments
	Main version:
	Main path:
	Main checksum:
	Build settings:
		-buildmode:           exe
		-compiler:            gc
		-ldflags:             -X main.version=0.2.53
		DefaultGODEBUG:       panicnil=1
		CGO_ENABLED:          1
		CGO_CFLAGS:
		CGO_CPPFLAGS:
		CGO_CXXFLAGS:
		CGO_LDFLAGS:
		GOARCH:               arm64
		GOOS:                 darwin
Docker Engine:
	Engine version:        24.0.6
	Engine runtime:        runc
	Cgroup version:        2
	Cgroup driver:         cgroupfs
	Storage driver:        overlay2
	Registry URI:          https://index.docker.io/v1/
	OS:                    Docker Desktop
	OS type:               linux
	OS version:
	OS arch:               aarch64
	OS kernel:             6.4.16-linuxkit
	OS CPU:                12
	OS memory:             7844 MB
	Security options:
		name=seccomp,profile=unconfined
		name=cgroupns

Command used with act

act -vW .github/workflows/sample.yml

Describe issue

If runs-on receives an array expression, act incorrectly evaluates it to %!t(string=Array). act correctly handles string expressions, as well as static string and array yaml values.

I.e. these work:

runs-on: ubuntu-latest
runs-on: ${{ fromJSON('"ubuntu-latest"') }}
runs-on: [ubuntu-latest]

But this does not:

runs-on: ${{ fromJSON('["ubuntu-latest"]') }}

The bug isn't specific to fromJSON, as the same issue occurs if the expression is an array value from a matrix, e.g.

runs-on: ${{ matrix.runner }}
strategy:
  matrix:
    runner: [[ubuntu-latest], [self-hosted, my-cool-label]]

These scenarios all work as expected in actual GitHub Actions workflow runs.

Link to GitHub repository

https://github.com/jenseng/dynamic-uses/actions/runs/6801153354/job/18491354468

Workflow content

name: test
on: push
jobs:
  test:
    # runs-on: ubuntu-latest
    # runs-on: ${{ fromJSON('"ubuntu-latest"') }}
    # runs-on: [ubuntu-latest]
    runs-on: ${{ fromJSON('["ubuntu-latest"]') }}
    steps:
      - run: echo "Hello, world!"

Relevant log output

WARN  ⚠ You are using Apple M-series chip and you have not specified container architecture, you might encounter issues while running act. If so, try running it with '--container-architecture linux/amd64'. ⚠
DEBU[0000] Loading environment from /Users/jonj/projects/dynamic-uses/.env
DEBU[0000] Loading action inputs from /Users/jonj/projects/dynamic-uses/.input
DEBU[0000] Loading secrets from /Users/jonj/projects/dynamic-uses/.secrets
DEBU[0000] Loading vars from /Users/jonj/projects/dynamic-uses/.vars
DEBU[0000] Evaluated matrix inclusions: map[]
DEBU[0000] Loading workflow '/Users/jonj/projects/dynamic-uses/.github/workflows/sample.yml'
DEBU[0000] Reading workflow '/Users/jonj/projects/dynamic-uses/.github/workflows/sample.yml'
DEBU[0000] Preparing plan with all jobs
DEBU[0000] Using the only detected workflow event: push
DEBU[0000] Planning jobs for event: push
DEBU[0000] Conditional GET for notices etag=c694094f-9a86-4866-bf11-876c821d9fcb
DEBU[0000] gc: 2023-11-08 09:31:06.262245 -0700 MST m=+0.030477292  module=artifactcache
DEBU[0000] Plan Stages: [0x1400011ee10]
DEBU[0000] Stages Runs: [test]
DEBU[0000] Job.Name: test
DEBU[0000] Job.RawNeeds: {0 0    <nil> []    0 0}
DEBU[0000] Job.RawRunsOn: {8 0 !!str ${{ fromJSON('["ubuntu-latest"]') }}  <nil> []    8 14}
DEBU[0000] Job.Env: {0 0    <nil> []    0 0}
DEBU[0000] Job.If: {0 0  success()  <nil> []    0 0}
DEBU[0000] Job.Steps: echo "Hello, world!"
DEBU[0000] Job.TimeoutMinutes:
DEBU[0000] Job.Services: map[]
DEBU[0000] Job.Strategy: <nil>
DEBU[0000] Job.RawContainer: {0 0    <nil> []    0 0}
DEBU[0000] Job.Defaults.Run.Shell:
DEBU[0000] Job.Defaults.Run.WorkingDirectory:
DEBU[0000] Job.Outputs: map[]
DEBU[0000] Job.Uses:
DEBU[0000] Job.With: map[]
DEBU[0000] Job.Result:
DEBU[0000] Empty Strategy, matrixes=[map[]]
DEBU[0000] Job Matrices: [map[]]
DEBU[0000] Runner Matrices: map[]
DEBU[0000] Final matrix after applying user inclusions '[map[]]'
DEBU[0000] Loading revision from git directory
DEBU[0000] Found revision: 4af4b6a3356b02639095850fe2dce350906070ba
DEBU[0000] HEAD points to '4af4b6a3356b02639095850fe2dce350906070ba'
DEBU[0000] using github ref: refs/heads/debug-act-bug3
DEBU[0000] Found revision: 4af4b6a3356b02639095850fe2dce350906070ba
DEBU[0000] Detected CPUs: 12
[test/test] [DEBUG] evaluating expression 'success()'
[test/test] [DEBUG] expression 'success()' evaluated to 'true'
[test/test] [DEBUG] expression '${{ fromJSON('["ubuntu-latest"]') }}' rewritten to 'format('{0}', fromJSON('["ubuntu-latest"]'))'
[test/test] [DEBUG] evaluating expression 'format('{0}', fromJSON('["ubuntu-latest"]'))'
[test/test] [DEBUG] expression 'format('{0}', fromJSON('["ubuntu-latest"]'))' evaluated to '%!t(string=Array)'
[test/test] [DEBUG] expression '${{ fromJSON('["ubuntu-latest"]') }}' rewritten to 'format('{0}', fromJSON('["ubuntu-latest"]'))'
[test/test] [DEBUG] evaluating expression 'format('{0}', fromJSON('["ubuntu-latest"]'))'
[test/test] [DEBUG] expression 'format('{0}', fromJSON('["ubuntu-latest"]'))' evaluated to '%!t(string=Array)'
[test/test] 🚧  Skipping unsupported platform -- Try running with `-P Array=...`
DEBU[0000] Saving notices etag=c694094f-9a86-4866-bf11-876c821d9fcb
DEBU[0000] No new notices

Additional information

No response

Originally created by @jenseng on GitHub (Nov 8, 2023). Original GitHub issue: https://github.com/nektos/act/issues/2080 ### Bug report info ```plain text act version: 0.2.53 GOOS: darwin GOARCH: arm64 NumCPU: 12 Docker host: DOCKER_HOST environment variable is not set Sockets found: /var/run/docker.sock $HOME/.docker/run/docker.sock Config files: /Users/jonj/.actrc: -P ubuntu-latest=node:16-buster-slim -P ubuntu-22.04=node:16-bullseye-slim -P ubuntu-20.04=node:16-buster-slim -P ubuntu-18.04=node:16-buster-slim Build info: Go version: go1.21.3 Module path: command-line-arguments Main version: Main path: Main checksum: Build settings: -buildmode: exe -compiler: gc -ldflags: -X main.version=0.2.53 DefaultGODEBUG: panicnil=1 CGO_ENABLED: 1 CGO_CFLAGS: CGO_CPPFLAGS: CGO_CXXFLAGS: CGO_LDFLAGS: GOARCH: arm64 GOOS: darwin Docker Engine: Engine version: 24.0.6 Engine runtime: runc Cgroup version: 2 Cgroup driver: cgroupfs Storage driver: overlay2 Registry URI: https://index.docker.io/v1/ OS: Docker Desktop OS type: linux OS version: OS arch: aarch64 OS kernel: 6.4.16-linuxkit OS CPU: 12 OS memory: 7844 MB Security options: name=seccomp,profile=unconfined name=cgroupns ``` ### Command used with act ```sh act -vW .github/workflows/sample.yml ``` ### Describe issue If `runs-on` receives an array expression, act incorrectly evaluates it to `%!t(string=Array)`. act correctly handles string expressions, as well as static string and array yaml values. I.e. these work: * `runs-on: ubuntu-latest` * `runs-on: ${{ fromJSON('"ubuntu-latest"') }}` * `runs-on: [ubuntu-latest]` But this does not: * `runs-on: ${{ fromJSON('["ubuntu-latest"]') }}` The bug isn't specific to `fromJSON`, as the same issue occurs if the expression is an array value from a matrix, e.g. ```yaml runs-on: ${{ matrix.runner }} strategy: matrix: runner: [[ubuntu-latest], [self-hosted, my-cool-label]] ``` These scenarios all work as expected in actual GitHub Actions workflow runs. ### Link to GitHub repository https://github.com/jenseng/dynamic-uses/actions/runs/6801153354/job/18491354468 ### Workflow content ```yml name: test on: push jobs: test: # runs-on: ubuntu-latest # runs-on: ${{ fromJSON('"ubuntu-latest"') }} # runs-on: [ubuntu-latest] runs-on: ${{ fromJSON('["ubuntu-latest"]') }} steps: - run: echo "Hello, world!" ``` ### Relevant log output ```sh WARN ⚠ You are using Apple M-series chip and you have not specified container architecture, you might encounter issues while running act. If so, try running it with '--container-architecture linux/amd64'. ⚠ DEBU[0000] Loading environment from /Users/jonj/projects/dynamic-uses/.env DEBU[0000] Loading action inputs from /Users/jonj/projects/dynamic-uses/.input DEBU[0000] Loading secrets from /Users/jonj/projects/dynamic-uses/.secrets DEBU[0000] Loading vars from /Users/jonj/projects/dynamic-uses/.vars DEBU[0000] Evaluated matrix inclusions: map[] DEBU[0000] Loading workflow '/Users/jonj/projects/dynamic-uses/.github/workflows/sample.yml' DEBU[0000] Reading workflow '/Users/jonj/projects/dynamic-uses/.github/workflows/sample.yml' DEBU[0000] Preparing plan with all jobs DEBU[0000] Using the only detected workflow event: push DEBU[0000] Planning jobs for event: push DEBU[0000] Conditional GET for notices etag=c694094f-9a86-4866-bf11-876c821d9fcb DEBU[0000] gc: 2023-11-08 09:31:06.262245 -0700 MST m=+0.030477292 module=artifactcache DEBU[0000] Plan Stages: [0x1400011ee10] DEBU[0000] Stages Runs: [test] DEBU[0000] Job.Name: test DEBU[0000] Job.RawNeeds: {0 0 <nil> [] 0 0} DEBU[0000] Job.RawRunsOn: {8 0 !!str ${{ fromJSON('["ubuntu-latest"]') }} <nil> [] 8 14} DEBU[0000] Job.Env: {0 0 <nil> [] 0 0} DEBU[0000] Job.If: {0 0 success() <nil> [] 0 0} DEBU[0000] Job.Steps: echo "Hello, world!" DEBU[0000] Job.TimeoutMinutes: DEBU[0000] Job.Services: map[] DEBU[0000] Job.Strategy: <nil> DEBU[0000] Job.RawContainer: {0 0 <nil> [] 0 0} DEBU[0000] Job.Defaults.Run.Shell: DEBU[0000] Job.Defaults.Run.WorkingDirectory: DEBU[0000] Job.Outputs: map[] DEBU[0000] Job.Uses: DEBU[0000] Job.With: map[] DEBU[0000] Job.Result: DEBU[0000] Empty Strategy, matrixes=[map[]] DEBU[0000] Job Matrices: [map[]] DEBU[0000] Runner Matrices: map[] DEBU[0000] Final matrix after applying user inclusions '[map[]]' DEBU[0000] Loading revision from git directory DEBU[0000] Found revision: 4af4b6a3356b02639095850fe2dce350906070ba DEBU[0000] HEAD points to '4af4b6a3356b02639095850fe2dce350906070ba' DEBU[0000] using github ref: refs/heads/debug-act-bug3 DEBU[0000] Found revision: 4af4b6a3356b02639095850fe2dce350906070ba DEBU[0000] Detected CPUs: 12 [test/test] [DEBUG] evaluating expression 'success()' [test/test] [DEBUG] expression 'success()' evaluated to 'true' [test/test] [DEBUG] expression '${{ fromJSON('["ubuntu-latest"]') }}' rewritten to 'format('{0}', fromJSON('["ubuntu-latest"]'))' [test/test] [DEBUG] evaluating expression 'format('{0}', fromJSON('["ubuntu-latest"]'))' [test/test] [DEBUG] expression 'format('{0}', fromJSON('["ubuntu-latest"]'))' evaluated to '%!t(string=Array)' [test/test] [DEBUG] expression '${{ fromJSON('["ubuntu-latest"]') }}' rewritten to 'format('{0}', fromJSON('["ubuntu-latest"]'))' [test/test] [DEBUG] evaluating expression 'format('{0}', fromJSON('["ubuntu-latest"]'))' [test/test] [DEBUG] expression 'format('{0}', fromJSON('["ubuntu-latest"]'))' evaluated to '%!t(string=Array)' [test/test] 🚧 Skipping unsupported platform -- Try running with `-P Array=...` DEBU[0000] Saving notices etag=c694094f-9a86-4866-bf11-876c821d9fcb DEBU[0000] No new notices ``` ### Additional information _No response_

kerem

2026-03-01 21:48:03 +03:00

closed this issue
added the
kind/bug
label

kerem commented

2026-03-01 21:48:04 +03:00

Author

Owner

@jenseng commented on GitHub (Nov 8, 2023):

As a potential workaround, you can set -P array=someimage..., though that image would then be used for any runs-on array expression without considering its actual values.

@jenseng commented on GitHub (Nov 8, 2023): As a potential workaround, you can set `-P array=someimage...`, though that image would then be used for any runs-on array expression without considering its actual values.

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[GH-ISSUE #2080] runs-on does not accept array expressions #996