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annotate hooks/30-hostname.in @ 5535:a0d828e25482 draft

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Add --noconfigure option With this set dhcpcd will not configure anything on the host. The expectation is that a 3rd party script will instead.
author Roy Marples <roy@marples.name>
date Wed, 04 Nov 2020 14:18:48 +0000
parents b1808edeb35d
children
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rev   line source
5102
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1 # Set the hostname from DHCP data if required
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2
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3 # A hostname can either be a short hostname or a FQDN.
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4 # hostname_fqdn=true
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5 # hostname_fqdn=false
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6 # hostname_fqdn=server
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7
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8 # A value of server means just what the server says, don't manipulate it.
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9 # This could lead to an inconsistent hostname on a DHCPv4 and DHCPv6 network
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10 # where the DHCPv4 hostname is short and the DHCPv6 has an FQDN.
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11 # DHCPv6 has no hostname option.
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12 # RFC4702 section 3.1 says FQDN should be prefered over hostname.
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13 #
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14 # As such, the default is hostname_fqdn=true so that a consistent hostname
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15 # is always assigned.
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16 : ${hostname_fqdn:=true}
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17
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18 # If we used to set the hostname, but relinquish control of it, we should
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19 # reset to the default value.
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20 : ${hostname_default=@DEFAULT_HOSTNAME@}
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21
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22 # Some systems don't have hostname(1)
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23 _hostname()
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24 {
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25 if [ -z "${1+x}" ]; then
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26 if [ -r /proc/sys/kernel/hostname ]; then
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27 read name </proc/sys/kernel/hostname && echo "$name"
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28 elif type hostname >/dev/null 2>/dev/null; then
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29 hostname
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30 elif sysctl kern.hostname >/dev/null 2>&1; then
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31 sysctl -n kern.hostname
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32 elif sysctl kernel.hostname >/dev/null 2>&1; then
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33 sysctl -n kernel.hostname
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34 else
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35 return 1
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36 fi
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37 return $?
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38 fi
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39
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40 if [ -w /proc/sys/kernel/hostname ]; then
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41 echo "$1" >/proc/sys/kernel/hostname
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42 elif [ -n "$1" ] && type hostname >/dev/null 2>&1; then
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43 hostname "$1"
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44 elif sysctl kern.hostname >/dev/null 2>&1; then
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45 sysctl -w "kern.hostname=$1" >/dev/null
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46 elif sysctl kernel.hostname >/dev/null 2>&1; then
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47 sysctl -w "kernel.hostname=$1" >/dev/null
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48 else
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49 # May fail to set a blank hostname
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50 hostname "$1"
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51 fi
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52 }
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53
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54 is_default_hostname()
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55 {
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56 case "$1" in
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57 ""|"$hostname_default"|localhost|localhost.localdomain)
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58 return 0;;
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59 esac
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60 return 1
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61 }
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62
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63 need_hostname()
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64 {
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65 # Always load the hostname variable for future use
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66 hostname="$(_hostname)"
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67 is_default_hostname "$hostname" && return 0
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68
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69 case "$force_hostname" in
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70 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) return 0;;
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71 esac
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72
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73 if [ -n "$old_fqdn" ]; then
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74 if ${hfqdn} || ! ${hshort}; then
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75 [ "$hostname" = "$old_fqdn" ]
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76 else
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77 [ "$hostname" = "${old_fqdn%%.*}" ]
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78 fi
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79 elif [ -n "$old_host_name" ]; then
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80 if ${hfqdn}; then
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81 if [ -n "$old_domain_name" ] &&
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82 [ "$old_host_name" = "${old_host_name#*.}" ]
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83 then
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84 [ "$hostname" = \
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85 "$old_host_name.$old_domain_name" ]
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86 else
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87 [ "$hostname" = "$old_host_name" ]
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88 fi
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89 elif ${hshort}; then
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90 [ "$hostname" = "${old_host_name%%.*}" ]
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91 else
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92 [ "$hostname" = "$old_host_name" ]
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93 fi
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94 else
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95 # No old hostname
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96 false
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97 fi
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98 }
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99
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100 try_hostname()
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101 {
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102 [ "$hostname" = "$1" ] && return 0
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103 if valid_domainname "$1"; then
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104 syslog info "Setting hostname: $1"
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105 _hostname "$1"
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106 else
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107 syslog err "Invalid hostname: $1"
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108 fi
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109 }
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110
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111 set_hostname()
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112 {
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113 hfqdn=false
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114 hshort=false
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115 case "$hostname_fqdn" in
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116 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|1) hfqdn=true;;
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117 ""|[Ss][Ee][Rr][Vv][Ee][Rr]) ;;
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118 *) hshort=true;;
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119 esac
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120
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121 need_hostname || return
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122
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123 if [ -n "$new_fqdn" ]; then
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124 if ${hfqdn} || ! ${hshort}; then
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125 try_hostname "$new_fqdn"
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126 else
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127 try_hostname "${new_fqdn%%.*}"
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128 fi
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129 elif [ -n "$new_host_name" ]; then
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130 if ${hfqdn}; then
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131 if [ -n "$new_domain_name" ] &&
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132 [ "$new_host_name" = "${new_host_name#*.}" ]
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133 then
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134 try_hostname "$new_host_name.$new_domain_name"
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135 else
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136 try_hostname "$new_host_name"
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137 fi
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138 elif ${hshort}; then
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139 try_hostname "${new_host_name%%.*}"
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140 else
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141 try_hostname "$new_host_name"
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142 fi
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143 elif ! is_default_hostname "$hostname"; then
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144 try_hostname "$hostname_default"
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145 fi
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146 }
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147
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148 # For ease of use, map DHCP6 names onto our DHCP4 names
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149 case "$reason" in
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150 BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6)
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151 new_fqdn="$new_dhcp6_fqdn"
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152 old_fqdn="$old_dhcp6_fqdn"
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153 ;;
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154 esac
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155
5535
a0d828e25482 Add --noconfigure option
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156 if $if_configured && $if_up && [ "$reason" != ROUTERADVERT ]; then
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157 set_hostname
bab0daa700eb linux: the default hostname is (none)
Roy Marples <roy@marples.name>
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158 fi