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feat(wanda): add Platform field for cross-platform image resolution #334

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feat(wanda): add Platform field for cross-platform image resolution #334

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99d0612
feat(wanda): add Platform field for cross-platform image resolution
andrew-anyscale Dec 31, 2025
64f1c5d
tests, fixes
andrew-anyscale Dec 31, 2025
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17 changes: 15 additions & 2 deletions wanda/forge.go
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Original file line number Diff line number Diff line change
Expand Up @@ -55,14 +55,27 @@ func NewForge(config *ForgeConfig) (*Forge, error) {
return nil, fmt.Errorf("abs path for work dir: %w", err)
}

// Determine target platform for image resolution.
// If Platform is specified in config, parse it (e.g., "linux/arm64").
// Otherwise, default to the host OS/arch.
targetOS := runtime.GOOS
targetArch := runtime.GOARCH
if config.Platform != "" {
parts := strings.SplitN(config.Platform, "/", 2)
if len(parts) == 2 {
targetOS = parts[0]
targetArch = parts[1]
}
}
Comment on lines 60 to 67
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@gemini-code-assist gemini-code-assist bot Dec 31, 2025

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high

The current platform string parsing is not robust. It silently ignores malformed platform strings (e.g., "linux") by falling back to the host's platform, and can mis-parse strings like "/arm64" or "linux/". This could lead to unexpected behavior. It would be better to validate the format and return an error for invalid input.

Suggested change
if config.Platform != "" {
parts := strings.SplitN(config.Platform, "/", 2)
if len(parts) == 2 {
targetOS = parts[0]
targetArch = parts[1]
}
}
if config.Platform != "" {
parts := strings.SplitN(config.Platform, "/", 2)
if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
return nil, fmt.Errorf("invalid platform format: %q, expected \"os/arch\"", config.Platform)
}
targetOS = parts[0]
targetArch = parts[1]
}


f := &Forge{
config: config,
workDir: absWorkDir,
remoteOpts: []remote.Option{
remote.WithAuthFromKeychain(authn.DefaultKeychain),
remote.WithPlatform(crane.Platform{
OS: runtime.GOOS,
Architecture: runtime.GOARCH,
OS: targetOS,
Architecture: targetArch,
}),
},
}
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4 changes: 4 additions & 0 deletions wanda/forge_config.go
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Expand Up @@ -14,6 +14,10 @@ type ForgeConfig struct {
BuildID string
Epoch string

// Platform specifies the target platform for image resolution (e.g., "linux/arm64").
// If empty, defaults to the host OS/arch.
Platform string

RayCI bool
Rebuild bool

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9 changes: 9 additions & 0 deletions wanda/wanda/main.go
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Expand Up @@ -27,6 +27,7 @@ Flags:
func main() {
workDir := flag.String("work_dir", ".", "root directory for the build")
docker := flag.String("docker", "", "path to the docker client binary")
platform := flag.String("platform", "", "target platform for image resolution (e.g., linux/arm64)")
rayCI := flag.Bool(
"rayci", false,
"takes RAYCI_ env vars for input and run in remote mode",
Expand Down Expand Up @@ -71,13 +72,21 @@ func main() {
input = os.Getenv("RAYCI_WANDA_FILE")
}

// Platform can be set via flag or WANDA_PLATFORM env var.
// This is needed for cross-platform builds (e.g., building linux/arm64 on macOS).
targetPlatform := *platform
if targetPlatform == "" {
targetPlatform = os.Getenv("WANDA_PLATFORM")
}

config := &wanda.ForgeConfig{
WorkDir: *workDir,
DockerBin: *docker,
WorkRepo: *workRepo,
NamePrefix: *namePrefix,
BuildID: *buildID,
Epoch: *epoch,
Platform: targetPlatform,

RayCI: *rayCI,
Rebuild: *rebuild,
Expand Down