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nektos
runner.arch is incorrect when overriding architecture with --container-architecture
Bug report info
act version: 0.2.77
GOOS: darwin
GOARCH: arm64
NumCPU: 10
Docker host: DOCKER_HOST environment variable is not set
Sockets found:
/var/run/docker.sock
Config files:
/Users/development/Library/Application Support/act/actrc:
-P ubuntu-latest=catthehacker/ubuntu:act-latest
-P ubuntu-22.04=catthehacker/ubuntu:act-22.04
-P ubuntu-20.04=catthehacker/ubuntu:act-20.04
-P ubuntu-18.04=catthehacker/ubuntu:act-18.04
Build info:
Go version: go1.24.2
Module path: github.com/nektos/act
Main version: v0.2.78-0.20250504121323-324bab61f056
Main path: github.com/nektos/act
Main checksum:
Build settings:
-buildmode: exe
-compiler: gc
CGO_ENABLED: 1
CGO_CFLAGS:
CGO_CPPFLAGS:
CGO_CXXFLAGS:
CGO_LDFLAGS:
GOARCH: arm64
GOOS: darwin
GOARM64: v8.0
vcs: git
vcs.revision: 324bab61f056e7e103b142b4c2f8b3b34421d764
vcs.time: 2025-05-04T12:13:23Z
vcs.modified: false
Docker Engine:
Engine version: 27.5.1
Engine runtime: runc
Cgroup version: 2
Cgroup driver: cgroupfs
Storage driver: overlay2
Registry URI: https://index.docker.io/v1/
OS: OrbStack
OS type: linux
OS version:
OS arch: aarch64
OS kernel: 6.12.15-orbstack-00304-gd0ddcf70447d
OS CPU: 10
OS memory: 12008 MB
Security options:
name=seccomp,profile=builtin
name=cgroupns
Command used with act
act --container-architecture linux/amd64 -W test.yml -P catthehacker/ubuntu:act-latest
Describe issue
When using --container-architecture to specify the architecture to launch the runner with, the runner.arch variable is always the host's architecture.
Link to GitHub repository
No response
Workflow content
name: Test
on:
workflow_dispatch:
jobs:
setup-trivy:
runs-on: ubuntu-latest
steps:
- run: echo ${{ runner.arch }}
Relevant log output
INFO[0000] Using docker host 'unix:///var/run/docker.sock', and daemon socket 'unix:///var/run/docker.sock'
[Test/setup-trivy] ⭐ Run Set up job
[Test/setup-trivy] 🚀 Start image=catthehacker/ubuntu:act-latest
[Test/setup-trivy] 🐳 docker pull image=catthehacker/ubuntu:act-latest platform=linux/amd64 username= forcePull=true
[Test/setup-trivy] 🐳 docker create image=catthehacker/ubuntu:act-latest platform=linux/amd64 entrypoint=["tail" "-f" "/dev/null"] cmd=[] network="host"
[Test/setup-trivy] 🐳 docker run image=catthehacker/ubuntu:act-latest platform=linux/amd64 entrypoint=["tail" "-f" "/dev/null"] cmd=[] network="host"
[Test/setup-trivy] 🐳 docker exec cmd=[node --no-warnings -e console.log(process.execPath)] user= workdir=
[Test/setup-trivy] ✅ Success - Set up job
[Test/setup-trivy] ⭐ Run Main echo ARM64
[Test/setup-trivy] 🐳 docker exec cmd=[bash -e /var/run/act/workflow/0] user= workdir=
| ARM64
[Test/setup-trivy] ✅ Success - Main echo ARM64 [39.567708ms]
[Test/setup-trivy] ⭐ Run Complete job
[Test/setup-trivy] Cleaning up container for job setup-trivy
[Test/setup-trivy] ✅ Success - Complete job
[Test/setup-trivy] 🏁 Job succeeded
Additional information
This was previously raised in #1549 but the ticket was autoclosed.
I'm having a look into this but having a hard time tracking down where changes need to be made.
