fix(dev): surface registry pull errors

tools/homarr-dev/internal/tui/dev.go

@@ -154,15 +154,21 @@ func startPull(ctx context.Context, cmd *exec.Cmd, events chan<- pullEvent) tea.
 			defer reader.Close()
 			scanner := bufio.NewScanner(reader)
 			scanner.Split(splitDockerProgress)
+			lastLine := ""
 			for scanner.Scan() {
 				line := strings.TrimSpace(scanner.Text())
-				if line != "" && ctx.Err() == nil && len(events) < cap(events)-1 {
-					events <- pullEvent{line: line}
+				if line != "" {
+					lastLine = line
+					if ctx.Err() == nil && len(events) < cap(events)-1 {
+						events <- pullEvent{line: line}
+					}
 				}
 			}
 			err := cmd.Wait()
 			if err == nil {
 				err = scanner.Err()
+			} else {
+				err = pullCommandError(err, lastLine)
 			}
 			events <- pullEvent{done: true, err: err}
 		}()
@@ -170,6 +176,13 @@ func startPull(ctx context.Context, cmd *exec.Cmd, events chan<- pullEvent) tea.
 	}
 }
 
+func pullCommandError(err error, lastLine string) error {
+	if lastLine == "" {
+		return err
+	}
+	return fmt.Errorf("%w: %s", err, lastLine)
+}
+
 func waitPull(events <-chan pullEvent) tea.Cmd {
 	return func() tea.Msg {
 		event, ok := <-events
@@ -779,8 +792,8 @@ func (m prsModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				}
 			}
 			if row.kind == "remote" {
-				if row.imageState != "yes" {
-					m.status = fmt.Sprintf("PR #%d cannot start: image is %s", row.pr.Number, row.imageState)
+				if row.imageState == "checking" {
+					m.status = fmt.Sprintf("PR #%d image check is still in progress", row.pr.Number)
 					return m, nil
 				}
 				return m, m.beginPull(*row)

tools/homarr-dev/internal/tui/dev_test.go

@@ -1,6 +1,7 @@
 package tui
 
 import (
+	"errors"
 	"strings"
 	"testing"
 
@@ -83,9 +84,9 @@ func TestRemotePRBuildUsesTemporaryPRWorkflow(t *testing.T) {
 	}
 }
 
-func TestPRWithoutImageDoesNotLaunch(t *testing.T) {
+func TestPRImageCheckInProgressDoesNotLaunch(t *testing.T) {
 	m := newPRsModel()
-	m.rows = []prRow{{kind: "remote", pr: gh.PR{Number: 6441, Title: "No image"}, imageState: "no"}}
+	m.rows = []prRow{{kind: "remote", pr: gh.PR{Number: 6441, Title: "Pending image"}, imageState: "checking"}}
 	m.table.SetRows(buildTableRows(m.rows))
 
 	updated, cmd := m.Update(tea.KeyPressMsg(tea.Key{Code: tea.KeyEnter}))
@@ -93,11 +94,18 @@ func TestPRWithoutImageDoesNotLaunch(t *testing.T) {
 	if cmd != nil {
 		t.Fatal("unavailable image returned a launch command")
 	}
-	if !strings.Contains(got.status, "cannot start") {
+	if !strings.Contains(got.status, "still in progress") {
 		t.Fatalf("status = %q, want launch rejection", got.status)
 	}
 }
 
+func TestPullErrorIncludesLastDockerMessage(t *testing.T) {
+	err := pullCommandError(errors.New("exit status 1"), "manifest unknown")
+	if !strings.Contains(err.Error(), "manifest unknown") {
+		t.Fatalf("pull error = %v", err)
+	}
+}
+
 func TestDevTableRendersLocalImageSource(t *testing.T) {
 	m := newPRsModel()
 	m.rows = []prRow{{