api: fix --all returning no output on single-page results

.changes/unreleased/BUG FIXES-20260713-133903.yaml

@@ -0,0 +1,3 @@
+kind: BUG FIXES
+body: Fix `api --all` returning no output when the result fits in a single page. The response body was consumed while checking for additional pages and not restored, so single-page responses rendered empty.
+time: 2026-07-13T13:39:03-04:00

internal/commands/api/api.go

@@ -694,7 +694,10 @@ func paginateResponse(ctx context.Context, apiClient *client.Client, initial *ht
 
 	combined, nextURL, err := parsePaginationPayload(initialBody)
 	if err != nil || nextURL == nil {
-
+		// io.ReadAll above consumed initial.Body. There is nothing to paginate
+		// (single page, or the payload isn't a paginated collection), so restore
+		// the body for the caller to read.
+		initial.Body = io.NopCloser(bytes.NewReader(initialBody))
 		return initial, err
 	}
 

internal/commands/api/api_paginate_singlepage_test.go

@@ -0,0 +1,47 @@
+// Copyright IBM Corp. 2026
+// SPDX-License-Identifier: MPL-2.0
+
+package api
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/hashicorp/tfctl-cli/internal/pkg/iostreams"
+)
+
+// TestRunAPI_PaginateSinglePage covers the case where --all is set but the
+// result fits in a single page (no "next" link). The response body must still
+// be rendered; a single-page result must not come back empty just because
+// pagination was requested.
+func TestRunAPI_PaginateSinglePage(t *testing.T) {
+	t.Parallel()
+
+	server, recorder := newAPITestServer(map[string]http.HandlerFunc{
+		"GET /api/v2/workspaces": func(w http.ResponseWriter, _ *http.Request) {
+			writeJSONAPIResponse(w, http.StatusOK, map[string]any{
+				"data": []any{
+					map[string]any{"id": "ws-1", "type": "workspaces", "attributes": map[string]any{"name": "alpha"}},
+				},
+				"links": map[string]any{"next": nil},
+				"meta":  map[string]any{"pagination": map[string]any{"total-count": 1}},
+			})
+		},
+	})
+	defer server.Close()
+
+	io := iostreams.Test()
+	err := RunAPI(context.Background(), newTestOpts(t, server.URL, io, func(opts *Opts) {
+		opts.URL = mustResolveTestURL(t, opts.Client.BaseURL.String(), "/workspaces")
+		opts.All = true
+	}))
+	require.NoError(t, err)
+
+	require.Len(t, recorder.All(), 1)
+	require.Contains(t, io.Output.String(), "alpha",
+		"single-page --all result must still be rendered, got: %q", io.Output.String())
+	require.Empty(t, io.Error.String())
+}