[BACKPORT 2.20.7][PLAT-15695] os rehydration fails with root install …

…dir change

Summary:
Original commit: None / D38962
Because it is possible to change the root install directory on a rehydration,
yba-installer will set the config to enable path fixup.

Also fixed a bug with the prometheus log file symlink

Test Plan: os rehydration with upgrade + root install change.

Reviewers: muthu, sanketh

Reviewed By: muthu

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D38966

managed/yba-installer/cmd/prometheus.go

@@ -31,7 +31,7 @@ type prometheusDirectories struct {
 	DataDir             string
 	PromDir             string
 	cronScript          string
-	LogDir							string
+	LogDir              string
 }
 
 func newPrometheusDirectories() prometheusDirectories {
@@ -48,7 +48,7 @@ func newPrometheusDirectories() prometheusDirectories {
 		PromDir:             common.GetSoftwareRoot() + "/prometheus",
 		cronScript: filepath.Join(
 			common.GetInstallerSoftwareDir(), common.CronDir, "managePrometheus.sh"),
-		LogDir:							 logDir,
+		LogDir: logDir,
 	}
 }
 
@@ -134,6 +134,10 @@ func (prom Prometheus) Initialize() error {
 		return err
 	}
 
+	if err := prom.createDataSymlinks(); err != nil {
+		return err
+	}
+
 	if err := prom.Start(); err != nil {
 		return err
 	}
@@ -536,12 +540,6 @@ func (prom Prometheus) createPrometheusSymlinks() error {
 		{promPkg, prom.PromDir, "consoles"},
 		{promPkg, prom.PromDir, "console_libraries"},
 	}
-	// for root the log file is in /var/log in case of SELinux
-	if (common.HasSudoAccess()) {
-		links = append(links, struct {
-			pkgDir, linkDir, binary string
-		}{prom.LogDir, filepath.Join(common.GetBaseInstall(), "data/logs"), "prometheus.log"})
-	}
 	for _, link := range links {
 		if err := common.CreateSymlink(link.pkgDir, link.linkDir, link.binary); err != nil {
 			log.Error("failed to create symlink for " + link.binary + ": " + err.Error())
@@ -559,6 +557,17 @@ func (prom Prometheus) createPrometheusSymlinks() error {
 	return nil
 }
 
+func (prom Prometheus) createDataSymlinks() error {
+	if common.HasSudoAccess() {
+		// for root the log file is in /var/log in case of SELinux
+		if err := common.CreateSymlink(prom.LogDir,
+			filepath.Join(common.GetBaseInstall(), "data/logs"), "prometheus.log"); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (prom Prometheus) migrateReplicatedDirs() error {
 	if err := common.MkdirAll(prom.DataDir, common.DirMode); err != nil {
 		return fmt.Errorf("failed to create %s: %w", prom.DataDir, err)

managed/yba-installer/cmd/service_control.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/spf13/cobra"
 	"github.com/yugabyte/yugabyte-db/managed/yba-installer/pkg/common"
+	"github.com/yugabyte/yugabyte-db/managed/yba-installer/pkg/config"
 	log "github.com/yugabyte/yugabyte-db/managed/yba-installer/pkg/logging"
 	"github.com/yugabyte/yugabyte-db/managed/yba-installer/pkg/preflight"
 	"github.com/yugabyte/yugabyte-db/managed/yba-installer/pkg/preflight/checks"
@@ -47,11 +48,20 @@ var startCmd = &cobra.Command{
 			if preflight.ShouldFail(results) {
 				log.Fatal("preflight failed")
 			}
+			if err := common.Chown(common.GetDataRoot(), "yugabyte", "yugabyte", true); err != nil {
+				log.Fatal("Failed to change ownership of data directory: " + err.Error())
+			}
 			log.Info("Initializing YBA before starting services")
 			if err := common.Initialize(); err != nil {
 				log.Fatal("Failed to initialize common components: " + err.Error())
 			}
 			for _, name := range serviceOrder {
+				if name == "yb-platform" {
+					log.Info("Generating yb-platform config with fixPaths set to true")
+					plat := services[name].(Platform)
+					plat.FixPaths = true
+					config.GenerateTemplate(plat)
+				}
 				if err := services[name].Initialize(); err != nil {
 					log.Fatal("Failed to initialize " + name + ": " + err.Error())
 				}