fix: add cross-platform disk detection for Windows/macOS builds

- Split detectDiskSpace() into platform-specific files with build tags
- disk_unix.go: Uses unix.Statfs for Linux and macOS
- disk_windows.go: Uses windows.GetDiskFreeSpaceEx for Windows
- Fixes Windows cross-compilation build errors

🤖 Generated with Claude Code

HOWTOSTART.md

@@ -0,0 +1,121 @@
+# How to Start a GitCaddy Runner
+
+This guide explains how to set up and start a GitCaddy Actions runner (act_runner) to execute your CI/CD workflows.
+
+## Prerequisites
+
+- A Linux, macOS, or Windows machine
+- Network access to your GitCaddy/Gitea instance
+- (Optional) Docker installed for container-based workflows
+
+## Quick Start
+
+### 1. Download the Runner
+
+Download the latest release from the [releases page](https://git.marketally.com/gitcaddy/act_runner/releases) or build from source:
+
+```bash
+git clone https://git.marketally.com/gitcaddy/act_runner.git
+cd act_runner
+make build
+```
+
+### 2. Register the Runner
+
+Get a registration token from your GitCaddy instance:
+- **Global runners**: Admin Area → Actions → Runners → Create Runner
+- **Organization runners**: Organization Settings → Actions → Runners
+- **Repository runners**: Repository Settings → Actions → Runners
+
+Then register:
+
+```bash
+./act_runner register --no-interactive \
+  --instance https://your-gitea-instance.com \
+  --token YOUR_REGISTRATION_TOKEN \
+  --name my-runner \
+  --labels linux,ubuntu-latest
+```
+
+### 3. Start the Runner
+
+```bash
+./act_runner daemon
+```
+
+## Configuration Options
+
+### Runner Labels
+
+Labels determine which jobs the runner can execute. Configure labels during registration or edit them in the admin UI.
+
+Common labels:
+- `linux`, `linux-latest` - Linux runners
+- `windows`, `windows-latest` - Windows runners
+- `macos`, `macos-latest` - macOS runners
+- `ubuntu`, `ubuntu-latest` - Ubuntu-specific
+- `self-hosted` - Self-hosted runners
+
+### Running as a Service
+
+#### Linux (systemd)
+
+```bash
+sudo cat > /etc/systemd/system/act_runner.service << 'SERVICE'
+[Unit]
+Description=GitCaddy Actions Runner
+After=network.target
+
+[Service]
+Type=simple
+User=runner
+WorkingDirectory=/opt/act_runner
+ExecStart=/opt/act_runner/act_runner daemon
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target
+SERVICE
+
+sudo systemctl enable act_runner
+sudo systemctl start act_runner
+```
+
+### Docker Support
+
+For workflows that use container actions, ensure Docker is installed and the runner user has access:
+
+```bash
+sudo usermod -aG docker $USER
+```
+
+## Capabilities Detection
+
+The runner automatically detects and reports:
+- Operating system and architecture
+- Available shells (bash, sh, powershell)
+- Installed tools (node, python, go, etc.)
+- Docker availability
+- Disk space and network bandwidth
+
+These capabilities help admins understand what each runner can handle.
+
+## Troubleshooting
+
+### Runner not connecting
+
+1. Check network connectivity to your GitCaddy instance
+2. Verify the registration token is valid
+3. Check firewall rules allow outbound HTTPS
+
+### Jobs not running
+
+1. Verify runner labels match the job's `runs-on` requirement
+2. Check runner is online in the admin panel
+3. Review runner logs: `journalctl -u act_runner -f`
+
+## More Information
+
+- [act_runner Repository](https://git.marketally.com/gitcaddy/act_runner)
+- [GitCaddy Documentation](https://git.marketally.com/gitcaddy/gitea)

go.mod

@@ -23,6 +23,8 @@ require (
 	gotest.tools/v3 v3.5.1
 )
 
+require golang.org/x/sys v0.37.0
+
 require (
 	cyphar.com/go-pathrs v0.2.1 // indirect
 	dario.cat/mergo v1.0.0 // indirect
@@ -96,7 +98,6 @@ require (
 	golang.org/x/crypto v0.43.0 // indirect
 	golang.org/x/net v0.45.0 // indirect
 	golang.org/x/sync v0.16.0 // indirect
-	golang.org/x/sys v0.37.0 // indirect
 	golang.org/x/tools v0.23.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
@@ -110,4 +111,4 @@ replace github.com/go-git/go-git/v5 => github.com/go-git/go-git/v5 v5.16.2
 replace github.com/distribution/reference v0.6.0 => github.com/distribution/reference v0.5.0
 
 // Use GitCaddy fork with capability support
-replace code.gitea.io/actions-proto-go => git.marketally.com/gitcaddy/actions-proto-go v0.5.2
+replace code.gitea.io/actions-proto-go => git.marketally.com/gitcaddy/actions-proto-go v0.5.7

go.sum

@@ -6,8 +6,8 @@ cyphar.com/go-pathrs v0.2.1 h1:9nx1vOgwVvX1mNBWDu93+vaceedpbsDqo+XuBGL40b8=
 cyphar.com/go-pathrs v0.2.1/go.mod h1:y8f1EMG7r+hCuFf/rXsKqMJrJAUoADZGNh5/vZPKcGc=
 dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
 dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
-git.marketally.com/gitcaddy/actions-proto-go v0.5.2 h1:+0tDJeyduhxpYrBNScN8w5din/0zJ/KtAh/Eo6mE9QE=
-git.marketally.com/gitcaddy/actions-proto-go v0.5.2/go.mod h1:mn7Wkqz6JbnTOHQpot3yDeHx+O5C9EGhMEE+htvHBas=
+git.marketally.com/gitcaddy/actions-proto-go v0.5.7 h1:RUbafr3Vkw2l4WfSwa+oF+Ihakbm05W0FlAmXuQrDJc=
+git.marketally.com/gitcaddy/actions-proto-go v0.5.7/go.mod h1:RPu21UoRD3zSAujoZR6LJwuVNa2uFRBveadslczCRfQ=
 gitea.com/gitea/act v0.261.7-0.20251202193638-5417d3ac6742 h1:ulcquQluJbmNASkh6ina70LvcHEa9eWYfQ+DeAZ0VEE=
 gitea.com/gitea/act v0.261.7-0.20251202193638-5417d3ac6742/go.mod h1:Pg5C9kQY1CEA3QjthjhlrqOC/QOT5NyWNjOjRHw23Ok=
 github.com/AdaLogics/go-fuzz-headers v0.0.0-20230811130428-ced1acdcaa24 h1:bvDV9vkmnHYOMsOr4WLk+Vo07yKIzd94sVoIqshQ4bU=

internal/app/cmd/daemon.go

@@ -30,6 +30,20 @@ import (
 	"gitea.com/gitea/act_runner/internal/pkg/ver"
 )
 
+const (
+	// DiskSpaceWarningThreshold is the percentage at which to warn about low disk space
+	DiskSpaceWarningThreshold = 85.0
+	// DiskSpaceCriticalThreshold is the percentage at which to log critical warnings
+	DiskSpaceCriticalThreshold = 95.0
+	// CapabilitiesUpdateInterval is how often to update capabilities (including disk space)
+	CapabilitiesUpdateInterval = 5 * time.Minute
+	// BandwidthTestInterval is how often to run bandwidth tests (hourly)
+	BandwidthTestInterval = 1 * time.Hour
+)
+
+// Global bandwidth manager - accessible for triggering manual tests
+var bandwidthManager *envcheck.BandwidthManager
+
 func runDaemon(ctx context.Context, daemArgs *daemonArgs, configFile *string) func(cmd *cobra.Command, args []string) error {
 	return func(cmd *cobra.Command, args []string) error {
 		cfg, err := config.LoadDefault(*configFile)
@@ -143,10 +157,21 @@ func runDaemon(ctx context.Context, daemArgs *daemonArgs, configFile *string) fu
 				dockerHost = dh
 			}
 		}
+
+		// Initialize bandwidth manager with the Gitea server address
+		bandwidthManager = envcheck.NewBandwidthManager(reg.Address, BandwidthTestInterval)
+		bandwidthManager.Start(ctx)
+		log.Infof("bandwidth manager started, testing against: %s", reg.Address)
+
 		capabilities := envcheck.DetectCapabilities(ctx, dockerHost)
+		// Include initial bandwidth result if available
+		capabilities.Bandwidth = bandwidthManager.GetLastResult()
 		capabilitiesJson := capabilities.ToJSON()
 		log.Infof("detected capabilities: %s", capabilitiesJson)
 
+		// Check disk space and warn if low
+		checkDiskSpaceWarnings(capabilities)
+
 		// declare the labels of the runner before fetching tasks
 		resp, err := runner.Declare(ctx, ls.Names(), capabilitiesJson)
 		if err != nil && connect.CodeOf(err) == connect.CodeUnimplemented {
@@ -160,7 +185,11 @@ func runDaemon(ctx context.Context, daemArgs *daemonArgs, configFile *string) fu
 				resp.Msg.Runner.Name, resp.Msg.Runner.Version, resp.Msg.Runner.Labels)
 		}
 
+		// Start periodic capabilities update goroutine
+		go periodicCapabilitiesUpdate(ctx, runner, ls.Names(), dockerHost)
+
 		poller := poll.New(cfg, cli, runner)
+		poller.SetBandwidthManager(bandwidthManager)
 
 		if daemArgs.Once || reg.Ephemeral {
 			done := make(chan struct{})
@@ -194,6 +223,67 @@ func runDaemon(ctx context.Context, daemArgs *daemonArgs, configFile *string) fu
 	}
 }
 
+// checkDiskSpaceWarnings logs warnings if disk space is low
+func checkDiskSpaceWarnings(capabilities *envcheck.RunnerCapabilities) {
+	if capabilities.Disk == nil {
+		return
+	}
+
+	usedPercent := capabilities.Disk.UsedPercent
+	freeGB := float64(capabilities.Disk.Free) / (1024 * 1024 * 1024)
+
+	if usedPercent >= DiskSpaceCriticalThreshold {
+		log.Errorf("CRITICAL: Disk space critically low! %.1f%% used, only %.2f GB free. Runner may fail to execute jobs!", usedPercent, freeGB)
+	} else if usedPercent >= DiskSpaceWarningThreshold {
+		log.Warnf("WARNING: Disk space running low. %.1f%% used, %.2f GB free. Consider cleaning up disk space.", usedPercent, freeGB)
+	}
+}
+
+// periodicCapabilitiesUpdate periodically updates capabilities including disk space and bandwidth
+func periodicCapabilitiesUpdate(ctx context.Context, runner *run.Runner, labelNames []string, dockerHost string) {
+	ticker := time.NewTicker(CapabilitiesUpdateInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			log.Debug("stopping periodic capabilities update")
+			if bandwidthManager != nil {
+				bandwidthManager.Stop()
+			}
+			return
+		case <-ticker.C:
+			// Detect updated capabilities (disk space changes over time)
+			capabilities := envcheck.DetectCapabilities(ctx, dockerHost)
+
+			// Include latest bandwidth result
+			if bandwidthManager != nil {
+				capabilities.Bandwidth = bandwidthManager.GetLastResult()
+			}
+
+			capabilitiesJson := capabilities.ToJSON()
+
+			// Check for disk space warnings
+			checkDiskSpaceWarnings(capabilities)
+
+			// Send updated capabilities to server
+			_, err := runner.Declare(ctx, labelNames, capabilitiesJson)
+			if err != nil {
+				log.WithError(err).Debug("failed to update capabilities")
+			} else {
+				bandwidthInfo := ""
+				if capabilities.Bandwidth != nil {
+					bandwidthInfo = fmt.Sprintf(", bandwidth: %.1f Mbps", capabilities.Bandwidth.DownloadMbps)
+				}
+				log.Debugf("capabilities updated: disk %.1f%% used, %.2f GB free%s",
+					capabilities.Disk.UsedPercent,
+					float64(capabilities.Disk.Free)/(1024*1024*1024),
+					bandwidthInfo)
+			}
+		}
+	}
+}
+
 type daemonArgs struct {
 	Once bool
 }

internal/app/poll/poller.go

@@ -18,13 +18,15 @@ import (
 	"gitea.com/gitea/act_runner/internal/app/run"
 	"gitea.com/gitea/act_runner/internal/pkg/client"
 	"gitea.com/gitea/act_runner/internal/pkg/config"
+	"gitea.com/gitea/act_runner/internal/pkg/envcheck"
 )
 
 type Poller struct {
-	client       client.Client
-	runner       *run.Runner
-	cfg          *config.Config
-	tasksVersion atomic.Int64 // tasksVersion used to store the version of the last task fetched from the Gitea.
+	client           client.Client
+	runner           *run.Runner
+	cfg              *config.Config
+	tasksVersion     atomic.Int64 // tasksVersion used to store the version of the last task fetched from the Gitea.
+	bandwidthManager *envcheck.BandwidthManager
 
 	pollingCtx      context.Context
 	shutdownPolling context.CancelFunc
@@ -57,6 +59,11 @@ func New(cfg *config.Config, client client.Client, runner *run.Runner) *Poller {
 	}
 }
 
+// SetBandwidthManager sets the bandwidth manager for on-demand testing
+func (p *Poller) SetBandwidthManager(bm *envcheck.BandwidthManager) {
+	p.bandwidthManager = bm
+}
+
 func (p *Poller) Poll() {
 	limiter := rate.NewLimiter(rate.Every(p.cfg.Runner.FetchInterval), 1)
 	wg := &sync.WaitGroup{}
@@ -157,11 +164,23 @@ func (p *Poller) fetchTask(ctx context.Context) (*runnerv1.Task, bool) {
 	reqCtx, cancel := context.WithTimeout(ctx, p.cfg.Runner.FetchTimeout)
 	defer cancel()
 
+	// Detect capabilities including current disk space
+	caps := envcheck.DetectCapabilities(ctx, p.cfg.Container.DockerHost)
+
+	// Include latest bandwidth result if available
+	if p.bandwidthManager != nil {
+		caps.Bandwidth = p.bandwidthManager.GetLastResult()
+	}
+
+	capsJson := caps.ToJSON()
+
 	// Load the version value that was in the cache when the request was sent.
 	v := p.tasksVersion.Load()
-	resp, err := p.client.FetchTask(reqCtx, connect.NewRequest(&runnerv1.FetchTaskRequest{
-		TasksVersion: v,
-	}))
+	fetchReq := &runnerv1.FetchTaskRequest{
+		TasksVersion:     v,
+		CapabilitiesJson: capsJson,
+	}
+	resp, err := p.client.FetchTask(reqCtx, connect.NewRequest(fetchReq))
 	if errors.Is(err, context.DeadlineExceeded) {
 		err = nil
 	}
@@ -174,6 +193,18 @@ func (p *Poller) fetchTask(ctx context.Context) (*runnerv1.Task, bool) {
 		return nil, false
 	}
 
+	// Check if server requested a bandwidth test
+	if resp.Msg.RequestBandwidthTest && p.bandwidthManager != nil {
+		log.Info("Server requested bandwidth test, running now...")
+		go func() {
+			result := p.bandwidthManager.RunTest(ctx)
+			if result != nil {
+				log.Infof("Bandwidth test completed: %.1f Mbps download, %.0f ms latency",
+					result.DownloadMbps, result.Latency)
+			}
+		}()
+	}
+
 	if resp.Msg.TasksVersion > v {
 		p.tasksVersion.CompareAndSwap(v, resp.Msg.TasksVersion)
 	}
@@ -182,7 +213,7 @@ func (p *Poller) fetchTask(ctx context.Context) (*runnerv1.Task, bool) {
 		return nil, false
 	}
 
-	// got a task, set `tasksVersion` to zero to focre query db in next request.
+	// got a task, set tasksVersion to zero to force query db in next request.
 	p.tasksVersion.CompareAndSwap(resp.Msg.TasksVersion, 0)
 
 	return resp.Msg.Task, true

internal/pkg/envcheck/bandwidth.go

@@ -0,0 +1,209 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package envcheck
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"sync"
+	"time"
+)
+
+// BandwidthInfo holds network bandwidth test results
+type BandwidthInfo struct {
+	DownloadMbps float64   `json:"download_mbps"`
+	UploadMbps   float64   `json:"upload_mbps,omitempty"`
+	Latency      float64   `json:"latency_ms,omitempty"`
+	TestedAt     time.Time `json:"tested_at"`
+}
+
+// BandwidthManager handles periodic bandwidth testing
+type BandwidthManager struct {
+	serverURL    string
+	lastResult   *BandwidthInfo
+	mu           sync.RWMutex
+	testInterval time.Duration
+	stopChan     chan struct{}
+}
+
+// NewBandwidthManager creates a new bandwidth manager
+func NewBandwidthManager(serverURL string, testInterval time.Duration) *BandwidthManager {
+	return &BandwidthManager{
+		serverURL:    serverURL,
+		testInterval: testInterval,
+		stopChan:     make(chan struct{}),
+	}
+}
+
+// Start begins periodic bandwidth testing
+func (bm *BandwidthManager) Start(ctx context.Context) {
+	// Run initial test
+	bm.RunTest(ctx)
+
+	// Start periodic testing
+	go func() {
+		ticker := time.NewTicker(bm.testInterval)
+		defer ticker.Stop()
+
+		for {
+			select {
+			case <-ticker.C:
+				bm.RunTest(ctx)
+			case <-bm.stopChan:
+				return
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+}
+
+// Stop stops the periodic testing
+func (bm *BandwidthManager) Stop() {
+	close(bm.stopChan)
+}
+
+// RunTest runs a bandwidth test and stores the result
+func (bm *BandwidthManager) RunTest(ctx context.Context) *BandwidthInfo {
+	result := TestBandwidth(ctx, bm.serverURL)
+
+	bm.mu.Lock()
+	bm.lastResult = result
+	bm.mu.Unlock()
+
+	return result
+}
+
+// GetLastResult returns the most recent bandwidth test result
+func (bm *BandwidthManager) GetLastResult() *BandwidthInfo {
+	bm.mu.RLock()
+	defer bm.mu.RUnlock()
+	return bm.lastResult
+}
+
+// TestBandwidth tests network bandwidth to the Gitea server
+func TestBandwidth(ctx context.Context, serverURL string) *BandwidthInfo {
+	if serverURL == "" {
+		return nil
+	}
+
+	info := &BandwidthInfo{
+		TestedAt: time.Now(),
+	}
+
+	// Test latency first
+	info.Latency = testLatency(ctx, serverURL)
+
+	// Test download speed
+	info.DownloadMbps = testDownloadSpeed(ctx, serverURL)
+
+	return info
+}
+
+func testLatency(ctx context.Context, serverURL string) float64 {
+	client := &http.Client{
+		Timeout: 10 * time.Second,
+	}
+
+	reqCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(reqCtx, "HEAD", serverURL, nil)
+	if err != nil {
+		return 0
+	}
+
+	start := time.Now()
+	resp, err := client.Do(req)
+	if err != nil {
+		return 0
+	}
+	resp.Body.Close()
+
+	latency := time.Since(start).Seconds() * 1000 // Convert to ms
+	return float64(int(latency*100)) / 100        // Round to 2 decimals
+}
+
+func testDownloadSpeed(ctx context.Context, serverURL string) float64 {
+	// Try multiple endpoints to accumulate ~1MB of data
+	endpoints := []string{
+		"/assets/css/index.css",
+		"/assets/js/index.js",
+		"/assets/img/logo.svg",
+		"/assets/img/logo.png",
+		"/",
+	}
+
+	client := &http.Client{
+		Timeout: 30 * time.Second,
+	}
+
+	var totalBytes int64
+	var totalDuration time.Duration
+	targetBytes := int64(1024 * 1024) // 1MB target
+	maxAttempts := 10                 // Limit iterations
+
+	for attempt := 0; attempt < maxAttempts && totalBytes < targetBytes; attempt++ {
+		for _, endpoint := range endpoints {
+			if totalBytes >= targetBytes {
+				break
+			}
+
+			url := serverURL + endpoint
+
+			reqCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
+			req, err := http.NewRequestWithContext(reqCtx, "GET", url, nil)
+			if err != nil {
+				cancel()
+				continue
+			}
+
+			start := time.Now()
+			resp, err := client.Do(req)
+			if err != nil {
+				cancel()
+				continue
+			}
+
+			n, _ := io.Copy(io.Discard, resp.Body)
+			resp.Body.Close()
+			cancel()
+
+			duration := time.Since(start)
+
+			if n > 0 {
+				totalBytes += n
+				totalDuration += duration
+			}
+		}
+	}
+
+	if totalBytes == 0 || totalDuration == 0 {
+		return 0
+	}
+
+	// Calculate speed in Mbps
+	seconds := totalDuration.Seconds()
+	if seconds == 0 {
+		return 0
+	}
+
+	bytesPerSecond := float64(totalBytes) / seconds
+	mbps := (bytesPerSecond * 8) / (1024 * 1024)
+
+	return float64(int(mbps*100)) / 100
+}
+
+// FormatBandwidth formats bandwidth for display
+func FormatBandwidth(mbps float64) string {
+	if mbps == 0 {
+		return "Unknown"
+	}
+	if mbps >= 1000 {
+		return fmt.Sprintf("%.1f Gbps", mbps/1000)
+	}
+	return fmt.Sprintf("%.1f Mbps", mbps)
+}

internal/pkg/envcheck/capabilities.go

@@ -4,8 +4,10 @@
 package envcheck
 
 import (
+	"bufio"
 	"context"
 	"encoding/json"
+	"os"
 	"os/exec"
 	"runtime"
 	"strings"
@@ -14,10 +16,26 @@ import (
 	"github.com/docker/docker/client"
 )
 
+// DiskInfo holds disk space information
+type DiskInfo struct {
+	Total       uint64  `json:"total_bytes"`
+	Free        uint64  `json:"free_bytes"`
+	Used        uint64  `json:"used_bytes"`
+	UsedPercent float64 `json:"used_percent"`
+}
+
+// DistroInfo holds Linux distribution information
+type DistroInfo struct {
+	ID         string `json:"id,omitempty"`          // e.g., "ubuntu", "debian", "fedora"
+	VersionID  string `json:"version_id,omitempty"`  // e.g., "24.04", "12"
+	PrettyName string `json:"pretty_name,omitempty"` // e.g., "Ubuntu 24.04 LTS"
+}
+
 // RunnerCapabilities represents the capabilities of a runner for AI consumption
 type RunnerCapabilities struct {
 	OS               string              `json:"os"`
 	Arch             string              `json:"arch"`
+	Distro           *DistroInfo         `json:"distro,omitempty"`
 	Docker           bool                `json:"docker"`
 	DockerCompose    bool                `json:"docker_compose"`
 	ContainerRuntime string              `json:"container_runtime,omitempty"`
@@ -25,6 +43,9 @@ type RunnerCapabilities struct {
 	Tools            map[string][]string `json:"tools,omitempty"`
 	Features         *CapabilityFeatures `json:"features,omitempty"`
 	Limitations      []string            `json:"limitations,omitempty"`
+	Disk             *DiskInfo           `json:"disk,omitempty"`
+	Bandwidth        *BandwidthInfo      `json:"bandwidth,omitempty"`
+	SuggestedLabels  []string            `json:"suggested_labels,omitempty"`
 }
 
 // CapabilityFeatures represents feature support flags
@@ -38,10 +59,10 @@ type CapabilityFeatures struct {
 // DetectCapabilities detects the runner's capabilities
 func DetectCapabilities(ctx context.Context, dockerHost string) *RunnerCapabilities {
 	cap := &RunnerCapabilities{
-		OS:     runtime.GOOS,
-		Arch:   runtime.GOARCH,
-		Tools:  make(map[string][]string),
-		Shell:  detectShells(),
+		OS:    runtime.GOOS,
+		Arch:  runtime.GOARCH,
+		Tools: make(map[string][]string),
+		Shell: detectShells(),
 		Features: &CapabilityFeatures{
 			ArtifactsV4:      false, // Gitea doesn't support v4 artifacts
 			Cache:            true,
@@ -54,6 +75,11 @@ func DetectCapabilities(ctx context.Context, dockerHost string) *RunnerCapabilit
 		},
 	}
 
+	// Detect Linux distribution
+	if runtime.GOOS == "linux" {
+		cap.Distro = detectLinuxDistro()
+	}
+
 	// Detect Docker
 	cap.Docker, cap.ContainerRuntime = detectDocker(ctx, dockerHost)
 	if cap.Docker {
@@ -64,9 +90,80 @@ func DetectCapabilities(ctx context.Context, dockerHost string) *RunnerCapabilit
 	// Detect common tools
 	detectTools(ctx, cap)
 
+	// Detect disk space
+	cap.Disk = detectDiskSpace()
+
+	// Generate suggested labels based on detected capabilities
+	cap.SuggestedLabels = generateSuggestedLabels(cap)
+
 	return cap
 }
 
+// detectLinuxDistro reads /etc/os-release to get distribution info
+func detectLinuxDistro() *DistroInfo {
+	file, err := os.Open("/etc/os-release")
+	if err != nil {
+		return nil
+	}
+	defer file.Close()
+
+	distro := &DistroInfo{}
+	scanner := bufio.NewScanner(file)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.HasPrefix(line, "ID=") {
+			distro.ID = strings.Trim(strings.TrimPrefix(line, "ID="), "\"")
+		} else if strings.HasPrefix(line, "VERSION_ID=") {
+			distro.VersionID = strings.Trim(strings.TrimPrefix(line, "VERSION_ID="), "\"")
+		} else if strings.HasPrefix(line, "PRETTY_NAME=") {
+			distro.PrettyName = strings.Trim(strings.TrimPrefix(line, "PRETTY_NAME="), "\"")
+		}
+	}
+
+	if distro.ID == "" {
+		return nil
+	}
+
+	return distro
+}
+
+// generateSuggestedLabels creates industry-standard labels based on capabilities
+func generateSuggestedLabels(cap *RunnerCapabilities) []string {
+	labels := []string{}
+	seen := make(map[string]bool)
+
+	addLabel := func(label string) {
+		if label != "" && !seen[label] {
+			seen[label] = true
+			labels = append(labels, label)
+		}
+	}
+
+	// OS labels
+	switch cap.OS {
+	case "linux":
+		addLabel("linux")
+		addLabel("linux-latest")
+	case "windows":
+		addLabel("windows")
+		addLabel("windows-latest")
+	case "darwin":
+		addLabel("macos")
+		addLabel("macos-latest")
+	}
+
+	// Distro labels (Linux only)
+	if cap.Distro != nil && cap.Distro.ID != "" {
+		distro := strings.ToLower(cap.Distro.ID)
+		addLabel(distro)
+		addLabel(distro + "-latest")
+	}
+
+	return labels
+}
+
+
 // ToJSON converts capabilities to JSON string for transmission
 func (c *RunnerCapabilities) ToJSON() string {
 	data, err := json.Marshal(c)

internal/pkg/envcheck/disk_unix.go

@@ -0,0 +1,32 @@
+//go:build unix
+
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package envcheck
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// detectDiskSpace detects disk space on the root filesystem (Unix version)
+func detectDiskSpace() *DiskInfo {
+	var stat unix.Statfs_t
+
+	err := unix.Statfs("/", &stat)
+	if err != nil {
+		return nil
+	}
+
+	total := stat.Blocks * uint64(stat.Bsize)
+	free := stat.Bavail * uint64(stat.Bsize)
+	used := total - free
+	usedPercent := float64(used) / float64(total) * 100
+
+	return &DiskInfo{
+		Total:       total,
+		Free:        free,
+		Used:        used,
+		UsedPercent: usedPercent,
+	}
+}

internal/pkg/envcheck/disk_windows.go

@@ -0,0 +1,31 @@
+//go:build windows
+
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package envcheck
+
+import (
+	"golang.org/x/sys/windows"
+)
+
+// detectDiskSpace detects disk space on the C: drive (Windows version)
+func detectDiskSpace() *DiskInfo {
+	var freeBytesAvailable, totalNumberOfBytes, totalNumberOfFreeBytes uint64
+
+	path := windows.StringToUTF16Ptr("C:\\")
+	err := windows.GetDiskFreeSpaceEx(path, &freeBytesAvailable, &totalNumberOfBytes, &totalNumberOfFreeBytes)
+	if err != nil {
+		return nil
+	}
+
+	used := totalNumberOfBytes - totalNumberOfFreeBytes
+	usedPercent := float64(used) / float64(totalNumberOfBytes) * 100
+
+	return &DiskInfo{
+		Total:       totalNumberOfBytes,
+		Free:        totalNumberOfFreeBytes,
+		Used:        used,
+		UsedPercent: usedPercent,
+	}
+}