[8.5](backport #1252) Fixed: source uri reload for download/verify components

CHANGELOG.next.asciidoc

@@ -117,6 +117,7 @@
 - Fix a panic caused by a race condition when installing the Elastic Agent. {issues}806[806]
 - Use at least warning level for all status logs {pull}1218[1218]
 - Remove fleet event reporter and events from checkin body. {issue}993[993]
+- Fix unintended reset of source URI when downloading components {pull}1252[1252]
 
 ==== New features
 

internal/pkg/agent/operation/operator.go

@@ -141,13 +141,52 @@ func (o *Operator) Reload(rawConfig *config.Config) error {
 		return errors.New(err, "failed to unpack artifact config")
 	}
 
+	sourceURI, err := reloadSourceURI(o.logger, rawConfig)
+	if err != nil {
+		return errors.New(err, "failed to parse source URI")
+	}
+	tmp.C.SourceURI = sourceURI
+
 	if err := o.reloadComponent(o.downloader, "downloader", tmp.C); err != nil {
 		return err
 	}
 
 	return o.reloadComponent(o.verifier, "verifier", tmp.C)
 }
 
+func reloadSourceURI(logger *logger.Logger, rawConfig *config.Config) (string, error) {
+	type reloadConfig struct {
+		// SourceURI: source of the artifacts, e.g https://artifacts.elastic.co/downloads/
+		SourceURI string `json:"agent.download.sourceURI" config:"agent.download.sourceURI"`
+
+		// FleetSourceURI: source of the artifacts, e.g https://artifacts.elastic.co/downloads/ coming from fleet which uses
+		// different naming.
+		FleetSourceURI string `json:"agent.download.source_uri" config:"agent.download.source_uri"`
+	}
+	cfg := &reloadConfig{}
+	if err := rawConfig.Unpack(&cfg); err != nil {
+		return "", errors.New(err, "failed to unpack config during reload")
+	}
+
+	var newSourceURI string
+	if fleetURI := strings.TrimSpace(cfg.FleetSourceURI); fleetURI != "" {
+		// fleet configuration takes precedence
+		newSourceURI = fleetURI
+	} else if sourceURI := strings.TrimSpace(cfg.SourceURI); sourceURI != "" {
+		newSourceURI = sourceURI
+	}
+
+	if newSourceURI != "" {
+		logger.Infof("Source URI in operator changed to %q", newSourceURI)
+		return newSourceURI, nil
+	}
+
+	// source uri unset, reset to default
+	logger.Infof("Source URI in reset %q", artifact.DefaultSourceURI)
+	return artifact.DefaultSourceURI, nil
+
+}
+
 func (o *Operator) reloadComponent(component interface{}, name string, cfg *artifact.Config) error {
 	r, ok := component.(artifact.ConfigReloader)
 	if !ok {

internal/pkg/agent/operation/operator_test.go

@@ -15,10 +15,13 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/elastic/elastic-agent-client/v7/pkg/proto"
 
 	"github.com/elastic/elastic-agent/internal/pkg/agent/program"
+	"github.com/elastic/elastic-agent/internal/pkg/artifact"
+	"github.com/elastic/elastic-agent/internal/pkg/config"
 	"github.com/elastic/elastic-agent/internal/pkg/core/state"
 )
 
@@ -71,7 +74,7 @@ func TestConfigurableRun(t *testing.T) {
 	if err := operator.start(p, nil); err != nil {
 		t.Fatal(err)
 	}
-	defer operator.stop(p) // failure catch, to ensure no sub-process stays running
+	defer func() { _ = operator.stop(p) }() // failure catch, to ensure no sub-process stays running
 
 	waitFor(t, func() error {
 		items := operator.State()
@@ -87,6 +90,7 @@ func TestConfigurableRun(t *testing.T) {
 
 	// try to configure
 	cfg := make(map[string]interface{})
+	//nolint:gosec // rand is ok for test
 	tstFilePath := filepath.Join(os.TempDir(), fmt.Sprintf("tmp%d", rand.Uint32()))
 	cfg["TestFile"] = tstFilePath
 	if err := operator.pushConfig(p, cfg); err != nil {
@@ -145,7 +149,7 @@ func TestConfigurableFailed(t *testing.T) {
 	if err := operator.start(p, nil); err != nil {
 		t.Fatal(err)
 	}
-	defer operator.stop(p) // failure catch, to ensure no sub-process stays running
+	defer func() { _ = operator.stop(p) }() // failure catch, to ensure no sub-process stays running
 
 	var pid int
 	waitFor(t, func() error {
@@ -172,6 +176,7 @@ func TestConfigurableFailed(t *testing.T) {
 
 	// try to configure (with failed status)
 	cfg := make(map[string]interface{})
+	//nolint:gosec // rand is ok for test
 	tstFilePath := filepath.Join(os.TempDir(), fmt.Sprintf("tmp%d", rand.Uint32()))
 	cfg["TestFile"] = tstFilePath
 	cfg["Status"] = proto.StateObserved_FAILED
@@ -254,7 +259,7 @@ func TestConfigurableCrash(t *testing.T) {
 	if err := operator.start(p, nil); err != nil {
 		t.Fatal(err)
 	}
-	defer operator.stop(p) // failure catch, to ensure no sub-process stays running
+	defer func() { _ = operator.stop(p) }() // failure catch, to ensure no sub-process stays running
 
 	var pid int
 	waitFor(t, func() error {
@@ -272,6 +277,7 @@ func TestConfigurableCrash(t *testing.T) {
 
 	// try to configure (with failed status)
 	cfg := make(map[string]interface{})
+	//nolint:gosec // rand is ok for test
 	tstFilePath := filepath.Join(os.TempDir(), fmt.Sprintf("tmp%d", rand.Uint32()))
 	cfg["TestFile"] = tstFilePath
 	cfg["Crash"] = true
@@ -352,7 +358,7 @@ func TestConfigurableStartStop(t *testing.T) {
 	p := getProgram("configurable", "1.0")
 
 	operator := getTestOperator(t, downloadPath, installPath, p)
-	defer operator.stop(p) // failure catch, to ensure no sub-process stays running
+	defer func() { _ = operator.stop(p) }() // failure catch, to ensure no sub-process stays running
 
 	// start and stop it 3 times
 	for i := 0; i < 3; i++ {
@@ -396,11 +402,11 @@ func TestConfigurableService(t *testing.T) {
 	if err := operator.start(p, nil); err != nil {
 		t.Fatal(err)
 	}
-	defer operator.stop(p) // failure catch, to ensure no sub-process stays running
+	defer func() { _ = operator.stop(p) }() // failure catch, to ensure no sub-process stays running
 
 	// emulating a service, so we need to start the binary here in the test
 	spec := p.ProcessSpec()
-	cmd := exec.Command(spec.BinaryPath, fmt.Sprintf("%d", p.ServicePort()))
+	cmd := exec.Command(spec.BinaryPath, fmt.Sprintf("%d", p.ServicePort())) //nolint:gosec,G204 // this is fine
 	cmd.Env = append(cmd.Env, os.Environ()...)
 	cmd.Dir = filepath.Dir(spec.BinaryPath)
 	cmd.Stdout = os.Stdout
@@ -423,6 +429,7 @@ func TestConfigurableService(t *testing.T) {
 
 	// try to configure
 	cfg := make(map[string]interface{})
+	//nolint:gosec // rand is ok for test
 	tstFilePath := filepath.Join(os.TempDir(), fmt.Sprintf("tmp%d", rand.Uint32()))
 	cfg["TestFile"] = tstFilePath
 	if err := operator.pushConfig(p, cfg); err != nil {
@@ -462,6 +469,51 @@ func TestConfigurableService(t *testing.T) {
 	}
 }
 
+func TestReloadSourceURI(t *testing.T) {
+	testCases := map[string]struct {
+		IncomingConfig    map[string]interface{}
+		ExpectedSourceURI string
+	}{
+		"no-config": {
+			IncomingConfig:    map[string]interface{}{},
+			ExpectedSourceURI: artifact.DefaultSourceURI,
+		},
+		"source-uri-provided": {
+			IncomingConfig: map[string]interface{}{
+				"agent.download.sourceURI": "http://source-uri",
+			},
+			ExpectedSourceURI: "http://source-uri",
+		},
+		"fleet-source-uri-provided": {
+			IncomingConfig: map[string]interface{}{
+				"agent.download.source_uri": "http://fleet-source-uri",
+			},
+			ExpectedSourceURI: "http://fleet-source-uri",
+		},
+		"both-source-uri-provided": {
+			IncomingConfig: map[string]interface{}{
+				"agent.download.sourceURI":  "http://source-uri",
+				"agent.download.source_uri": "http://fleet-source-uri",
+			},
+			ExpectedSourceURI: "http://fleet-source-uri",
+		},
+	}
+
+	l := getLogger()
+	for testName, tc := range testCases {
+		t.Run(testName, func(t *testing.T) {
+			cfg, err := config.NewConfigFrom(tc.IncomingConfig)
+			require.NoError(t, err)
+			require.NotNil(t, cfg)
+
+			sourceUri, err := reloadSourceURI(l, cfg)
+			require.NoError(t, err)
+			require.Equal(t, tc.ExpectedSourceURI, sourceUri)
+
+		})
+	}
+}
+
 func isAvailable(name, version string) error {
 	p := getProgram(name, version)
 	spec := p.ProcessSpec()

internal/pkg/artifact/config.go

@@ -22,7 +22,7 @@ const (
 	linux   = "linux"
 	windows = "windows"
 
-	defaultSourceURI = "https://artifacts.elastic.co/downloads/"
+	DefaultSourceURI = "https://artifacts.elastic.co/downloads/"
 )
 
 type ConfigReloader interface {
@@ -139,8 +139,8 @@ func (r *Reloader) reloadSourceURI(rawConfig *config.Config) error {
 		r.cfg.SourceURI = newSourceURI
 	} else {
 		// source uri unset, reset to default
-		r.log.Infof("Source URI reset from %q to %q", r.cfg.SourceURI, defaultSourceURI)
-		r.cfg.SourceURI = defaultSourceURI
+		r.log.Infof("Source URI reset from %q to %q", r.cfg.SourceURI, DefaultSourceURI)
+		r.cfg.SourceURI = DefaultSourceURI
 	}
 
 	return nil
@@ -156,7 +156,7 @@ func DefaultConfig() *Config {
 	transport.Timeout = 10 * time.Minute
 
 	return &Config{
-		SourceURI:             defaultSourceURI,
+		SourceURI:             DefaultSourceURI,
 		TargetDirectory:       paths.Downloads(),
 		InstallPath:           paths.Install(),
 		HTTPTransportSettings: transport,