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 ${x,,}
  32   else
  33     echo "unknown distro"
  34     return 1
  35   fi
  36 }
  37
  38 distro-name-compat() {
  39   local x
  40   x=$(distro-name)
  41   case $x in
  42     trisquel)
  43       echo ubuntu
  44       ;;
  45     *)
  46       printf "%s\n" "$x"
  47       ;;
  48   esac
  49 }
  50
  51 distro-name-ver() {
  52   printf "%s\n" "$(distro-name)$(debian-archive)"
  53 }
  54
  55 distro-num() {
  56   # Subshell keeps environment clean.
  57   ( . /etc/os-release
  58     # in ubuntu the .x matters, trisquel it doesnt
  59     if [[ $ID == ubuntu ]]; then
  60       echo $VERSION_ID
  61     else
  62       echo ${VERSION_ID%%.*}
  63     fi
  64   )
  65 }
  66
  67 debian-archive() {
  68   isdeb || return 0
  69   local archive expression pri name highpri shortest
  70   local policy="${1:-$(apt-cache policy)}" || return $?
  71   # a = archive
  72   # n = codename
  73   # o = origin
  74   # c = component (licensing component)
  75   # l = label (Debian{,-Security,-Updates})
  76   local d
  77   d=$(distro-name)
  78   # goto b for archive lines we are interested in, a for lines we arent
  79   # print priority + archive name. priority is in
  80   # the previous line from the archive line.
  81   # case insensitive, because $d is lower and we are matching with first char upper
  82   read -rd '' expression <<EOF ||:
  83 /o=$d/I!b a;/l=$d/I!b a;/c=main/!b a b b;
  84 : a;s/^ *([-0-9]+).*/\1/;h;b;
  85 : b;s/^.*a=([^,]+).*/ \1/;H;x;s/\n//;p
  86 EOF
  87   while read -r pri name; do
  88     # in ubuntu, we get archives like flidas, flidas-updates, all the same pri,
  89     # so just pick the shortest one.
  90     if [[ ! $highpri ]]; then
  91       highpri=$pri;
  92       shortest=$name
  93       continue
  94     fi
  95     if [[ $pri != "$highpri" ]]; then
  96       break
  97     fi
  98     if (( ${#shortest} > ${#name} )); then
  99       shortest=$name
 100     fi
 101   done < <(echo "$policy" | sed -rn "$expression" | sort -rn || [[ $? == 141 ]])
 102   echo "$shortest"
 103 }
 104
 105 # formatted for use in pfile() in package-manager-abstractions
 106 positive-origins() {
 107   isdeb || return 0
 108   local archive expression pri name highpri shortest policy
 109   # In theory we might want a policy subset, we could alter this to pass
 110   # it in.
 111   policy="(apt-cache policy)"
 112   # a = archive
 113   # n = codename
 114   # o = origin
 115   # c = component (licensing component)
 116   # l = label (Debian{,-Security,-Updates})
 117   read -rd '' expression <<EOF ||:
 118 /^ *([-0-9]+).*/{s/^ *([-0-9]+).*/\1/;h}
 119 /^.*o=([^,]+).*/{s/^.*o=([^,]+).*/ \1/;H;x;s/\n//;p}
 120 EOF
 121   origins=
 122   while read -r pri name; do
 123     if (( pri > 0 )); then
 124       if [[ ! $origins ]]; then
 125         origins=$name
 126       else
 127         origins+=,$name
 128       fi
 129     fi
 130   done < <(echo "$policy" | sed -rn "$expression" | sort -rn || [[ $? == 141 ]])
 131   echo $origins
 132 }
 133
 134 isdebian-testing() {
 135   [[ $(debian-archive) == testing ]]
 136 }
 137 # I only do testing or stable.
 138 isdebian-stable() {
 139   [[ $(debian-archive) == stable ]]
 140 }
 141
 142 debian-codename() {
 143   isdeb || return 0
 144   local policy
 145   policy="$(apt-cache policy)"
 146   archive=$(debian-archive "$policy")
 147   printf "%s\n" "$policy" | sed -rn "s/^.*a=$archive,n=([a-z]+).*/\1/p;T;q" || [[ $? == 141 ]]
 148 }
 149 debian-codename-compat() {
 150   local n
 151   n=$(debian-codename)
 152   case $n in
 153     flidas)
 154       echo xenial
 155       ;;
 156     etiona)
 157       echo bionic
 158       ;;
 159     nabia)
 160       echo focal
 161       ;;
 162     aramo)
 163       echo jammy
 164       ;;
 165     *)
 166       echo $n
 167       ;;
 168   esac
 169 }
 170
 171 isfedora() {
 172   [[ $(distro-name) == fedora ]]
 173 }
 174 isdebian() {
 175   [[ $(distro-name) == debian ]]
 176 }
 177 isarch() {
 178   [[ $(distro-name) == arch ]]
 179 }
 180 isubuntu() {
 181   [[ $(distro-name) == ubuntu ]]
 182 }
 183 istrisquel() {
 184   [[ $(distro-name) == trisquel ]]
 185 }
 186 # is debian/apt based
 187 isdeb() { command -v apt-get &>/dev/null; }