Merge pull request warewulf#853 from mslacken/fixBuildNoNetwork

fix SIGSEV if build host has no network

CHANGELOG.md

@@ -43,12 +43,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - The primary hostname and warewulf server fqdn are now the canonical name in
   `/etc/hosts`
-
 - Refactored `profile add` command to make it alike `node add`. #658 #659 
-
 - The ifcfg ONBOOT parameter is no longer statically `true`, so unconfigured
   interfaces may not be enabled by default. (#644)
-
+- Write log messages to stderr rather than stdout. #768
 - new subcommand `wwctl genconf` is available with following subcommands:
   * `completions` which will create the files used for bash-completion. Also
      fish an zsh completions can be generated
@@ -58,19 +56,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   * `warwulfconf print` which will print the used `warewulf.conf`. If there is no valid
      `warewulf.conf` a valid configuration is provided, prefilled with default values
      and an IP configuration derived from the network configuration of the host
-
 - All paths can now be configured in `warewulf.conf`, check the paths section of of 
    `wwctl --emptyconf genconfig warewulfconf print` for the available paths.
-
 - Added experimental dnsmasq support.
-
+- fix SIGSEV when build host has no network #907
 - Check for formal correct IP and MAC addresses for command line options and
   when reading in the configurations
 - Added template to create genders database
 - Write log messages to stderr rather than stdout. #768
 - Updates to Makefile for clarity, notably removing genconfig and replacing
   test-it with test. #890
-
 - realy reboot also without systemd
 - Specify primary network device per-node rather than per-netdev
 - refactored output `wwctl node/profile list` so that `-a` will only show all the

CONTRIBUTORS.md

@@ -26,4 +26,5 @@
 * Brian Phan <bphan@ciq.com>
 * Jeffrey Frey @jtfrey 
 * Xu Yang(Jason Yang) <jasonyangshadow@gmail.com> @JasonYangShadow
+* Matt Jolly <Kangie@footclan.ninja> @Kangie
 * Arnaud LECOMTE <contact@arnaud-lcm.com>

internal/pkg/config/root.go

@@ -6,7 +6,6 @@
 // DHCP, TFTP and NFS services that Warewulf manages.
 package config
 
-
 import (
 	"fmt"
 	"net"
@@ -20,10 +19,8 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
-
 var cachedConf RootConf
 
-
 // RootConf is the main Warewulf configuration structure. It stores
 // some information about the Warewulf server locally, and has
 // [WarewulfConf], [DHCPConf], [TFTPConf], and [NFSConf] sub-sections.
@@ -43,13 +40,12 @@ type RootConf struct {
 	MountsContainer []*MountEntry `yaml:"container mounts" default:"[{\"source\": \"/etc/resolv.conf\", \"dest\": \"/etc/resolv.conf\"}]"`
 	Paths           *BuildConfig  `yaml:"paths"`
 
-	fromFile        bool
+	fromFile bool
 }
 
-
 // New caches and returns a new [RootConf] initialized with empty
 // values, clearing replacing any previously cached value.
-func New() (*RootConf) {
+func New() *RootConf {
 	cachedConf = RootConf{}
 	cachedConf.fromFile = false
 	cachedConf.Warewulf = new(WarewulfConf)
@@ -63,10 +59,9 @@ func New() (*RootConf) {
 	return &cachedConf
 }
 
-
 // Get returns a previously cached [RootConf] if it exists, or returns
 // a new RootConf.
-func Get() (*RootConf) {
+func Get() *RootConf {
 	// NOTE: This function can be called before any log level is set
 	//       so using wwlog.Verbose or wwlog.Debug won't work
 	if reflect.ValueOf(cachedConf).IsZero() {
@@ -75,10 +70,9 @@ func Get() (*RootConf) {
 	return &cachedConf
 }
 
-
 // Read populates [RootConf] with the values from a configuration
 // file.
-func (conf *RootConf) Read(confFileName string) (error) {
+func (conf *RootConf) Read(confFileName string) error {
 	wwlog.Debug("Reading warewulf.conf from: %s", confFileName)
 	if data, err := os.ReadFile(confFileName); err != nil {
 		return err
@@ -90,9 +84,8 @@ func (conf *RootConf) Read(confFileName string) (error) {
 	}
 }
 
-
 // Parse populates [RootConf] with the values from a yaml document.
-func (conf *RootConf) Parse(data []byte) (error) {
+func (conf *RootConf) Parse(data []byte) error {
 	// ipxe binaries are merged not overwritten, store defaults separate
 	defIpxe := make(map[string]string)
 	for k, v := range conf.TFTP.IpxeBinaries {
@@ -108,7 +101,6 @@ func (conf *RootConf) Parse(data []byte) (error) {
 	return nil
 }
 
-
 // SetDynamicDefaults populates [RootConf] with plausible defaults for
 // the runtime environment.
 func (conf *RootConf) SetDynamicDefaults() (err error) {
@@ -119,12 +111,16 @@ func (conf *RootConf) SetDynamicDefaults() (err error) {
 
 		if conf.Ipaddr == "" {
 			wwlog.Verbose("Configuration has no valid network, going to dynamic values")
-			conn, _ := net.Dial("udp", "8.8.8.8:80")
-			defer conn.Close()
-			ipaddr = conn.LocalAddr().(*net.UDPAddr).IP
-			mask = ipaddr.DefaultMask()
-			sz, _ := mask.Size()
-			conf.Ipaddr = ipaddr.String() + fmt.Sprintf("/%d", sz)
+			conn, err := net.Dial("udp", "8.8.8.8:80")
+			if err == nil {
+				defer conn.Close()
+				ipaddr = conn.LocalAddr().(*net.UDPAddr).IP
+				mask = ipaddr.DefaultMask()
+				sz, _ := mask.Size()
+				conf.Ipaddr = ipaddr.String() + fmt.Sprintf("/%d", sz)
+			} else {
+				conf.Ipaddr = "192.168.1.1/24"
+			}
 		}
 		_, network, err = net.ParseCIDR(conf.Ipaddr)
 		if err == nil {
@@ -175,7 +171,6 @@ func (conf *RootConf) SetDynamicDefaults() (err error) {
 	return
 }
 
-
 // InitializedFromFile returns true if [RootConf] memory was read from
 // a file, or false otherwise.
 func (conf *RootConf) InitializedFromFile() bool {