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

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to switch
   7 # its license to GPL.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23 distro-name() {
  24   local x
  25   if [[ -f /etc/fedora-release ]]; then
  26     echo fedora
  27   elif [[ -e /etc/os-release ]]; then
  28     sed -rn 's/^ID=(.*)/\1/p' /etc/os-release
  29   elif type -p lsb_release &>/dev/null; then
  30     # well, this is more standard, but it's 2 ms vs 200 ms
  31     x=$(lsb_release -si); echo ${x,,}
  32   else
  33     echo "unknown distro"
  34     return 1
  35   fi
  36 }
  37
  38 distro-name-compat() {
  39   local x=$(distro-name)
  40   case $x in
  41     trisquel)
  42       echo ubuntu
  43       ;;
  44     *)
  45       echo $x
  46       ;;
  47   esac
  48 }
  49
  50 distro-name-ver() {
  51   echo $(distro-name)$(debian-archive)
  52 }
  53
  54 distro-num() {
  55   # Subshell keeps environment clean.
  56   ( . /etc/os-release
  57     # in ubuntu the .x matters, trisquel it doesnt
  58     if [[ $ID == ubuntu ]]; then
  59       echo $VERSION_ID
  60     else
  61       echo ${VERSION_ID%%.*}
  62     fi
  63   )
  64 }
  65
  66 debian-archive() {
  67   isdeb || return 0
  68   local archive expression pri name highpri shortest
  69   local policy="${1:-$(apt-cache policy)}" || return $?
  70   # a = archive
  71   # n = codename
  72   # o = origin
  73   # c = component (licensing component)
  74   # l = label (Debian{,-Security,-Updates})
  75   local d=$(distro-name)
  76   # goto b for archive lines we are interested in, a for lines we arent
  77   # print priority + archive name. priority is in
  78   # the previous line from the archive line.
  79   # case insensitive, because $d is lower and we are matching with first char upper
  80   read -rd '' expression <<EOF ||:
  81 /o=$d/I!b a;/l=$d/I!b a;/c=main/!b a b b;
  82 : a;s/^ *([-0-9]+).*/\1/;h;b;
  83 : b;s/^.*a=([^,]+).*/ \1/;H;x;s/\n//;p
  84 EOF
  85   while read -r pri name; do
  86     # in ubuntu, we get archives like flidas, flidas-updates, all the same pri,
  87     # so just pick the shortest one.
  88     if [[ ! $highpri ]]; then
  89       highpri=$pri;
  90       shortest=$name
  91       continue
  92     fi
  93     if [[ $pri != $highpri ]]; then
  94       break
  95     fi
  96     if (( ${#shortest} > ${#name} )); then
  97       shortest=$name
  98     fi
  99   done < <(echo "$policy" | sed -rn "$expression" | sort -rn || [[ $? == 141 ]])
 100   echo "$shortest"
 101 }
 102
 103 # formatted for use in pfile() in package-manager-abstractions
 104 positive-origins() {
 105   isdeb || return 0
 106   local archive expression pri name highpri shortest
 107   local policy="${1:-$(apt-cache policy)}" || return $?
 108   # a = archive
 109   # n = codename
 110   # o = origin
 111   # c = component (licensing component)
 112   # l = label (Debian{,-Security,-Updates})
 113   read -rd '' expression <<EOF ||:
 114 /^ *([-0-9]+).*/{s/^ *([-0-9]+).*/\1/;h}
 115 /^.*o=([^,]+).*/{s/^.*o=([^,]+).*/ \1/;H;x;s/\n//;p}
 116 EOF
 117   origins=
 118   while read -r pri name; do
 119     if (( pri > 0 )); then
 120       if [[ ! $origins ]]; then
 121         origins=$name
 122       else
 123         origins+=,$name
 124       fi
 125     fi
 126   done < <(echo "$policy" | sed -rn "$expression" | sort -rn || [[ $? == 141 ]])
 127   echo $origins
 128 }
 129
 130 isdebian-testing() {
 131   [[ $(debian-archive) == testing ]]
 132 }
 133 # I only do testing or stable.
 134 isdebian-stable() {
 135   [[ $(debian-archive) == stable ]]
 136 }
 137
 138 debian-codename() {
 139   isdeb || return 0
 140   local policy="$(apt-cache policy)" || return $?
 141   archive=$(debian-archive "$policy")
 142   echo "$policy" | sed -rn "s/^.*a=$archive,n=([a-z]+).*/\1/p;T;q" || [[ $? == 141 ]]
 143 }
 144 debian-codename-compat() {
 145   local n=$(debian-codename)
 146   case $n in
 147     flidas)
 148       echo xenial
 149       ;;
 150     etiona)
 151       echo bionic
 152       ;;
 153     nabia)
 154       echo focal
 155       ;;
 156     aramo)
 157       echo jammy
 158       ;;
 159     *)
 160       echo $n
 161       ;;
 162   esac
 163 }
 164
 165 isfedora() {
 166   [[ $(distro-name) == fedora ]]
 167 }
 168 isdebian() {
 169   [[ $(distro-name) == debian ]]
 170 }
 171 isarch() {
 172   [[ $(distro-name) == arch ]]
 173 }
 174 isubuntu() {
 175   [[ $(distro-name) == ubuntu ]]
 176 }
 177 istrisquel() {
 178   [[ $(distro-name) == trisquel ]]
 179 }
 180 # is debian/apt based
 181 isdeb() { command -v apt-get &>/dev/null; }