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reboot.go
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package system
import (
"fmt"
"os"
"os/exec"
"sort"
"strconv"
"strings"
)
// CheckRebootRequired checks if the system requires a reboot
// Returns (needsReboot bool, reason string)
func (d *Detector) CheckRebootRequired() (bool, string) {
runningKernel := d.getRunningKernel()
latestKernel := d.getLatestInstalledKernel()
// Check Debian/Ubuntu - reboot-required flag file
if _, err := os.Stat("/var/run/reboot-required"); err == nil {
d.logger.Debug("Reboot required: /var/run/reboot-required file exists")
reason := "Reboot flag file exists (/var/run/reboot-required)"
if runningKernel != latestKernel && latestKernel != "" {
reason += fmt.Sprintf(" | Running kernel: %s, Installed kernel: %s", runningKernel, latestKernel)
}
return true, reason
}
// Check RHEL/Fedora - needs-restarting utility
if needsRestart, reason := d.checkNeedsRestarting(); needsRestart {
d.logger.WithField("reason", reason).Debug("Reboot required: needs-restarting check")
if runningKernel != latestKernel && latestKernel != "" {
reason += fmt.Sprintf(" | Running kernel: %s, Installed kernel: %s", runningKernel, latestKernel)
}
return true, reason
}
// Universal kernel check - compare running vs latest installed
if runningKernel != latestKernel && latestKernel != "" {
d.logger.WithFields(map[string]interface{}{
"running": runningKernel,
"latest": latestKernel,
}).Debug("Reboot required: kernel version mismatch")
reason := fmt.Sprintf("Kernel version mismatch | Running kernel: %s, Installed kernel: %s", runningKernel, latestKernel)
return true, reason
}
d.logger.Debug("No reboot required")
return false, ""
}
// checkNeedsRestarting checks using needs-restarting command (RHEL/Fedora)
func (d *Detector) checkNeedsRestarting() (bool, string) {
// Check if needs-restarting command exists
if _, err := exec.LookPath("needs-restarting"); err != nil {
d.logger.Debug("needs-restarting command not found, skipping check")
return false, ""
}
cmd := exec.Command("needs-restarting", "-r")
if err := cmd.Run(); err != nil {
// Exit code != 0 means reboot is needed
if _, ok := err.(*exec.ExitError); ok {
return true, "needs-restarting indicates reboot needed"
}
d.logger.WithError(err).Debug("needs-restarting command failed")
}
return false, ""
}
// getRunningKernel gets the currently running kernel version
func (d *Detector) getRunningKernel() string {
cmd := exec.Command("uname", "-r")
output, err := cmd.Output()
if err != nil {
d.logger.WithError(err).Warn("Failed to get running kernel version")
return ""
}
return strings.TrimSpace(string(output))
}
// GetLatestInstalledKernel gets the latest installed kernel version (public method)
func (d *Detector) GetLatestInstalledKernel() string {
return d.getLatestInstalledKernel()
}
// getLatestInstalledKernel gets the latest installed kernel version
func (d *Detector) getLatestInstalledKernel() string {
// Try different methods based on common distro patterns
// Method 1: Debian/Ubuntu - check /boot for vmlinuz files
if latest := d.getLatestKernelFromBoot(); latest != "" {
return latest
}
// Method 2: RHEL/Fedora - use rpm to query installed kernels
if latest := d.getLatestKernelFromRPM(); latest != "" {
return latest
}
// Method 3: Try dpkg for Debian-based systems
if latest := d.getLatestKernelFromDpkg(); latest != "" {
return latest
}
d.logger.Debug("Could not determine latest installed kernel")
return ""
}
// getLatestKernelFromBoot scans /boot for vmlinuz files
func (d *Detector) getLatestKernelFromBoot() string {
entries, err := os.ReadDir("/boot")
if err != nil {
d.logger.WithError(err).Debug("Failed to read /boot directory")
return ""
}
var kernels []string
for _, entry := range entries {
name := entry.Name()
// Look for vmlinuz-* files
if strings.HasPrefix(name, "vmlinuz-") {
version := strings.TrimPrefix(name, "vmlinuz-")
// Skip generic/recovery kernels
if strings.Contains(version, "generic") || strings.Contains(version, "recovery") {
continue
}
kernels = append(kernels, version)
}
}
if len(kernels) == 0 {
return ""
}
// Sort kernels by version and return the latest
sort.Slice(kernels, func(i, j int) bool {
return compareKernelVersions(kernels[i], kernels[j]) < 0
})
return kernels[len(kernels)-1]
}
// compareKernelVersions compares two kernel version strings
// Returns: -1 if v1 < v2, 0 if v1 == v2, 1 if v1 > v2
// Handles formats like "6.14.11-2-pve" and "6.8.12-9-pve"
func compareKernelVersions(v1, v2 string) int {
// Split version into parts: "6.14.11-2-pve" -> ["6", "14", "11", "2", "pve"]
parts1 := parseKernelVersion(v1)
parts2 := parseKernelVersion(v2)
// Compare each part
maxLen := len(parts1)
if len(parts2) > maxLen {
maxLen = len(parts2)
}
for i := 0; i < maxLen; i++ {
var p1, p2 string
if i < len(parts1) {
p1 = parts1[i]
}
if i < len(parts2) {
p2 = parts2[i]
}
// Try to compare as numbers first
n1, err1 := strconv.Atoi(p1)
n2, err2 := strconv.Atoi(p2)
if err1 == nil && err2 == nil {
// Both are numbers
if n1 < n2 {
return -1
}
if n1 > n2 {
return 1
}
} else {
// At least one is not a number, compare as strings
if p1 < p2 {
return -1
}
if p1 > p2 {
return 1
}
}
}
return 0
}
// parseKernelVersion parses a kernel version string into comparable parts
// "6.14.11-2-pve" -> ["6", "14", "11", "2", "pve"]
func parseKernelVersion(version string) []string {
// Replace dots and dashes with spaces, then split
version = strings.ReplaceAll(version, ".", " ")
version = strings.ReplaceAll(version, "-", " ")
parts := strings.Fields(version)
return parts
}
// getLatestKernelFromRPM queries RPM for installed kernel packages
func (d *Detector) getLatestKernelFromRPM() string {
// Check if rpm command exists
if _, err := exec.LookPath("rpm"); err != nil {
return ""
}
cmd := exec.Command("rpm", "-q", "kernel", "--last")
output, err := cmd.Output()
if err != nil {
d.logger.WithError(err).Debug("Failed to query RPM for kernel packages")
return ""
}
lines := strings.Split(string(output), "\n")
if len(lines) > 0 && lines[0] != "" {
// Parse first line which should be the latest kernel
// Format: kernel-VERSION DATE
parts := strings.Fields(lines[0])
if len(parts) > 0 {
// Extract version from kernel-X.Y.Z
kernelPkg := parts[0]
version := strings.TrimPrefix(kernelPkg, "kernel-")
return version
}
}
return ""
}
// getLatestKernelFromDpkg queries dpkg for installed kernel packages
// FIXED: Now properly handles virtual meta-packages like linux-image-virtual
func (d *Detector) getLatestKernelFromDpkg() string {
// Check if dpkg command exists
if _, err := exec.LookPath("dpkg"); err != nil {
return ""
}
cmd := exec.Command("dpkg", "-l")
output, err := cmd.Output()
if err != nil {
d.logger.WithError(err).Debug("Failed to query dpkg for kernel packages")
return ""
}
var latestVersion string
lines := strings.Split(string(output), "
")
for _, line := range lines {
fields := strings.Fields(line)
if len(fields) < 2 {
continue
}
// Look for installed kernel image packages
if fields[0] == "ii" && strings.HasPrefix(fields[1], "linux-image-") {
// Extract version from package name
// Format: linux-image-VERSION or linux-image-X.Y.Z-N-generic
pkgName := fields[1]
version := strings.TrimPrefix(pkgName, "linux-image-")
// Skip meta packages (virtual, generic, lowlatency, cloud, etc.)
// These are wrappers that depend on actual kernel packages
metaPackages := map[string]bool{
"virtual": true, "generic": true, "lowlatency": true,
"cloud": true, "generic-hwe": true,
}
// Check if this is a meta-package
isMetaPackage := false
if metaPackages[version] {
isMetaPackage = true
} else if strings.HasPrefix(version, "generic-") {
// Handles generic-hwe-22.04, etc.
isMetaPackage = true
}
if isMetaPackage {
// Try to resolve the meta-package to its actual kernel
resolvedVersion := d.resolveMetaPackageKernel(pkgName)
if resolvedVersion != "" {
latestVersion = resolvedVersion
d.logger.WithFields(map[string]interface{}{
"metaPackage": pkgName,
"resolvedVersion": resolvedVersion,
}).Debug("Resolved kernel meta-package to actual kernel")
}
continue
}
latestVersion = version
}
}
return latestVersion
}
// resolveMetaPackageKernel resolves a meta-package (like linux-image-virtual)
// to its actual kernel package version by using apt-cache depends
func (d *Detector) resolveMetaPackageKernel(metaPackage string) string {
// Check if apt-cache command exists
if _, err := exec.LookPath("apt-cache"); err != nil {
d.logger.Debug("apt-cache command not found, cannot resolve meta-package")
return ""
}
// Use apt-cache depends to find dependencies
cmd := exec.Command("apt-cache", "depends", "--no-recommends", "--no-suggests", metaPackage)
output, err := cmd.Output()
if err != nil {
d.logger.WithError(err).Debug("Failed to resolve meta-package dependencies")
return ""
}
// Parse output for actual linux-image-* packages
// Expected format:
// linux-image-virtual
// Depends: linux-image-6.8.0-88-generic
lines := strings.Split(string(output), "
")
for _, line := range lines {
line = strings.TrimSpace(line)
// Look for the Depends: line with actual kernel package
if strings.HasPrefix(line, "Depends:") && strings.Contains(line, "linux-image-") {
// Extract package name after "Depends:"
parts := strings.Fields(line)
if len(parts) >= 2 {
kernelPkg := parts[1]
// Extract version from linux-image-X.Y.Z-BUILD-VARIANT
version := strings.TrimPrefix(kernelPkg, "linux-image-")
if version != "" && version != kernelPkg {
return version
}
}
}
}
d.logger.WithField("metaPackage", metaPackage).Debug("Could not resolve meta-package to actual kernel")
return ""
}