iankelling.org Git - distro-functions/blob - src/identify-distros

   1 #!/bin/bash
   2 # Copyright (C) 2014 Ian Kelling
   3
   4 # Licensed under the Apache License, Version 2.0 (the "License");
   5 # you may not use this file except in compliance with the License.
   6 # You may obtain a copy of the License at
   7
   8 #     http://www.apache.org/licenses/LICENSE-2.0
   9
  10 # Unless required by applicable law or agreed to in writing, software
  11 # distributed under the License is distributed on an "AS IS" BASIS,
  12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 # See the License for the specific language governing permissions and
  14 # limitations under the License.
  15
  16 distro-name() {
  17   local x
  18   if [[ -f /etc/fedora-release ]]; then
  19     echo fedora
  20   elif [[ -e /etc/os-release ]]; then
  21     sed -rn 's/^ID=(.*)/\1/p' /etc/os-release
  22   elif type -p lsb_release &>/dev/null; then
  23     # well, this is more standard, but it's 2 ms vs 200 ms
  24     x=$(lsb_release -si); echo ${x,,}
  25   else
  26     echo "unknown distro"
  27     return 1
  28   fi
  29 }
  30
  31 distro-name-compat() {
  32   local x=$(distro-name)
  33   case $x in
  34     trisquel)
  35       echo ubuntu
  36       ;;
  37     *)
  38       echo $x
  39       ;;
  40   esac
  41 }
  42
  43 distro-name-ver() {
  44   echo $(distro-name)$(debian-archive)
  45 }
  46
  47 distro-num() {
  48   # subshell keeps environment clean
  49   ( . /etc/os-release; echo ${VERSION_ID%%.*}; )
  50 }
  51
  52 debian-archive() {
  53   isdeb || return 0
  54   local archive expression pri name highpri shortest
  55   local policy="${1:-$(apt-cache policy)}" || return $?
  56   # a = archive
  57   # n = codename
  58   # o = origin
  59   # c = component (licensing component)
  60   # l = label (Debian{,-Security,-Updates})
  61   local d=$(distro-name)
  62   # goto b for archive lines we are interested in, a for lines we arent
  63   # print priority + archive name. priority is in
  64   # the previous line from the archive line.
  65   # case insensitive, because $d is lower and we are matching with first char upper
  66   read -rd '' expression <<EOF ||:
  67 /o=$d/I!b a;/l=$d/I!b a;/c=main/!b a b b;
  68 : a;s/^ *([-0-9]+).*/\1/;h;b;
  69 : b;s/^.*a=([^,]+).*/ \1/;H;x;s/\n//;p
  70 EOF
  71   while read -r pri name; do
  72     # in ubuntu, we get archives like flidas, flidas-updates, all the same pri,
  73     # so just pick the shortest one.
  74     if [[ ! $highpri ]]; then
  75       highpri=$pri;
  76       shortest=$name
  77       continue
  78     fi
  79     if [[ $pri != $highpri ]]; then
  80       break
  81     fi
  82     if (( ${#shortest} > ${#name} )); then
  83       shortest=$name
  84     fi
  85   done < <(echo "$policy" | sed -rn "$expression" | sort -rn || [[ $? == 141 ]])
  86   echo "$shortest"
  87
  88 }
  89
  90
  91 isdebian-testing() {
  92   [[ $(debian-archive) == testing ]]
  93 }
  94 # I only do testing or stable.
  95 isdebian-stable() {
  96   [[ $(debian-archive) == stable ]]
  97 }
  98
  99 debian-codename() {
 100   isdeb || return 0
 101   local policy="$(apt-cache policy)" || return $?
 102   archive=$(debian-archive "$policy")
 103   echo "$policy" | sed -rn "s/^.*a=$archive,n=([a-z]+).*/\1/p;T;q" || [[ $? == 141 ]]
 104 }
 105 debian-codename-compat() {
 106   local n=$(debian-codename)
 107   case $n in
 108     flidas)
 109       echo xenial
 110       ;;
 111     etiona)
 112       echo bionic
 113       ;;
 114     *)
 115       echo $n
 116       ;;
 117   esac
 118 }
 119
 120 isfedora() {
 121   [[ $(distro-name) == fedora ]]
 122 }
 123 isdebian() {
 124   [[ $(distro-name) == debian ]]
 125 }
 126 isarch() {
 127   [[ $(distro-name) == arch ]]
 128 }
 129 isubuntu() {
 130   [[ $(distro-name) == ubuntu ]]
 131 }
 132 istrisquel() {
 133   [[ $(distro-name) == trisquel ]]
 134 }
 135 # is debian/apt based
 136 isdeb() { command -v apt-get &>/dev/null; }