image-builder: update TestBuildIntegrationErrors tests

This commit updates the tests for the error reporting. Since
we are now using the new "progress" module we can no longer
directly mock osStderr. So this now uses the new testutil
helper `CaptureStdio`.

Note also that the behavior of `verbose` and `term` is slightly
different - for backward compatibility in `verbose` mode the
stderr from osbuild is directly connected to the caller stderr.

For term mode this is not done to prevent spurious message from
leaking into the terminal progress and the full error is available
from the actual go error as captured output.

cmd/image-builder/main_test.go

@@ -433,7 +433,14 @@ func TestBuildIntegrationArgs(t *testing.T) {
 	}
 }
 
-func TestBuildIntegrationErrors(t *testing.T) {
+var failingOsbuild = `
+cat - > "$0".stdin
+echo "error on stdout"
+>&2 echo "error on stderr"
+exit 1
+`
+
+func TestBuildIntegrationErrorsProgressVerbose(t *testing.T) {
 	if testing.Short() {
 		t.Skip("manifest generation takes a while")
 	}
@@ -444,34 +451,60 @@ func TestBuildIntegrationErrors(t *testing.T) {
 	restore := main.MockNewRepoRegistry(testrepos.New)
 	defer restore()
 
-	var fakeStdout, fakeStderr bytes.Buffer
-	restore = main.MockOsStdout(&fakeStdout)
+	restore = main.MockOsArgs([]string{
+		"build",
+		"qcow2",
+		"--distro", "centos-9",
+		"--progress=verbose",
+	})
 	defer restore()
-	restore = main.MockOsStderr(&fakeStderr)
+
+	fakeOsbuildCmd := testutil.MockCommand(t, "osbuild", failingOsbuild)
+	defer fakeOsbuildCmd.Restore()
+
+	var err error
+	stdout, stderr := testutil.CaptureStdio(t, func() {
+		err = main.Run()
+	})
+	assert.EqualError(t, err, "running osbuild failed: exit status 1")
+
+	assert.Contains(t, stdout, "error on stdout\n")
+	assert.Contains(t, stderr, "error on stderr\n")
+}
+
+func TestBuildIntegrationErrorsProgressTerm(t *testing.T) {
+	if testing.Short() {
+		t.Skip("manifest generation takes a while")
+	}
+	if !hasDepsolveDnf() {
+		t.Skip("no osbuild-depsolve-dnf binary found")
+	}
+
+	restore := main.MockNewRepoRegistry(testrepos.New)
 	defer restore()
 
 	restore = main.MockOsArgs([]string{
 		"build",
 		"qcow2",
 		"--distro", "centos-9",
+		"--progress=term",
 	})
 	defer restore()
 
-	script := `
-cat - > "$0".stdin
->&2 echo "error on stderr"
-exit 1
-`
-	fakeOsbuildCmd := testutil.MockCommand(t, "osbuild", script)
+	fakeOsbuildCmd := testutil.MockCommand(t, "osbuild", failingOsbuild)
 	defer fakeOsbuildCmd.Restore()
 
-	err := main.Run()
-	assert.EqualError(t, err, "running osbuild failed: exit status 1")
-	// ensure errors from osbuild are passed to the user
-	// XXX: once the osbuild.Status is used, also check that stdout
-	// is available (but that cannot be done with the existing
-	// osbuild-exec.go)
-	assert.Equal(t, "error on stderr\n", fakeStderr.String())
+	var err error
+	stdout, stderr := testutil.CaptureStdio(t, func() {
+		err = main.Run()
+	})
+	assert.EqualError(t, err, `error running osbuild: exit status 1
+Output:
+error on stdout
+error on stderr
+`)
+	assert.NotContains(t, stdout, "error on stdout")
+	assert.NotContains(t, stderr, "error on stderr")
 }
 
 func TestManifestIntegrationWithSBOMWithOutputDir(t *testing.T) {

go.mod

@@ -9,7 +9,7 @@ toolchain go1.22.2
 require (
 	github.com/BurntSushi/toml v1.4.0
 	github.com/gobwas/glob v0.2.3
-	github.com/osbuild/bootc-image-builder/bib v0.0.0-20250125114430-c5d674173ba0
+	github.com/osbuild/bootc-image-builder/bib v0.0.0-20250128074618-f6403409fc97
 	github.com/osbuild/images v0.112.0
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/cobra v1.8.1

go.sum

@@ -220,6 +220,8 @@ github.com/opencontainers/selinux v1.11.0 h1:+5Zbo97w3Lbmb3PeqQtpmTkMwsW5nRI3YaL
 github.com/opencontainers/selinux v1.11.0/go.mod h1:E5dMC3VPuVvVHDYmi78qvhJp8+M586T4DlDRYpFkyec=
 github.com/osbuild/bootc-image-builder/bib v0.0.0-20250125114430-c5d674173ba0 h1:aLxeLEO/C6/mAc4O8fgmDE7uaf6EwAiW79IP2GI/bvo=
 github.com/osbuild/bootc-image-builder/bib v0.0.0-20250125114430-c5d674173ba0/go.mod h1:22erXOiwfznPLNE5Y8hp35fnE0vh5ZjWp/iIQsVnYTg=
+github.com/osbuild/bootc-image-builder/bib v0.0.0-20250128074618-f6403409fc97 h1:Xyv+vDEGCcG1qkHkdQFPBXhvM5WiMiAJm/AjBkzW4Sw=
+github.com/osbuild/bootc-image-builder/bib v0.0.0-20250128074618-f6403409fc97/go.mod h1:22erXOiwfznPLNE5Y8hp35fnE0vh5ZjWp/iIQsVnYTg=
 github.com/osbuild/images v0.112.0 h1:+pKwPniwYTRRgist6V+7DQfZEg7osddl1z4pASecq4M=
 github.com/osbuild/images v0.112.0/go.mod h1:58tzp7jV50rjaH9gMpvmQdVati0c4TaC5Op7wmSD/tY=
 github.com/ostreedev/ostree-go v0.0.0-20210805093236-719684c64e4f h1:/UDgs8FGMqwnHagNDPGOlts35QkhAZ8by3DR7nMih7M=