8c34de3ef9
This introduces a collection of bash utility functions to check the upstream kernel releases for updated sources and possibly download and rebuild them automatically. Signed-off-by: Fil <fil.bergamo@riseup.net>
294 lines
7.7 KiB
Bash
Executable File
294 lines
7.7 KiB
Bash
Executable File
#!/bin/bash -x
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# This file is part of PrawnOS (http://www.prawnos.com)
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# Copyright (c) 2018 Hal Emmerich <hal@halemmerich.com>
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# Copyright (c) 2020 Fil Bergamo <fil@filberg.eu>
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# PrawnOS is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2
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# as published by the Free Software Foundation.
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# PrawnOS is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with PrawnOS. If not, see <https://www.gnu.org/licenses/>.
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# ------------------------------------------------------
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# STATIC CONFIGURATION
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# ------------------------------------------------------
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#
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# Upstream url to be checked for source updates
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# Gets variable-expanded by filling in the version string "w.x.y"
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# through funcion expand_version_pattern()
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# Here, VER means the main version number,
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# MAJ the major revision number,
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# MIN the minor revision number
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# (e.g. "LATEST-VER.MAJ.N" + becomes "LATEST-5.4.N" for "5.4.43")
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src_url="https://linux-libre.fsfla.org/pub/linux-libre/releases/LATEST-VER.MAJ.N"
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#
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# Timeout, in seconds, for remote operations (rsyc, wget..)
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remote_timeout=15
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#
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# Number of retires after a remote operation times out
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remote_retries=2
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#
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# Seconds to wait before retrying failed remote operations
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remote_wait_retry=5
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#
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# The tool to be used to search for updates
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# can only chose between "rsync" and "wget"
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remote_tool="wget"
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#
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# The naming pattern of the actual source archive
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# on as found in ${src_url}/${src_tar_pattern}
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# follows the same variable expansion as $src_url
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src_tar_pattern="linux-libre-VER.MAJ.MIN-gnu.tar.lz"
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#
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# Then naming pattern of the signature for the source archive
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src_tar_sig_pattern="${src_tar_pattern}.sign"
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#
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# The log file path (leave empty to disable logging)
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logfile=
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# ------------------------------------------------------
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log()
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{
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[ ! -z "$logfile" ] &&
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echo "$(date +'%Y-%m-%d %H:%M:%S') $1" >> $logfile
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}
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print_err()
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{
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printf "\033[0;31m%s\n" "[ERR] $1" 1>&2
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log "[ERR] $1"
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}
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print_warn()
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{
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echo "[WRN] $1" 1>&2
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log "[WRN] $1"
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}
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print_msg()
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{
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echo "[INF] $1"
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log "[INF] $1"
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}
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die()
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{
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print_err "$1"
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[ $# -gt 1 ] && exit $2
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exit 255
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}
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# function expand_version_pattern()
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# Replace VER, MAJ, MIN in the given pattern
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# with the given 'w', 'x' and 'y' values.
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# $1 = pattern
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# $2 = main version number ('w')
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# $3 = major revision number ('x')
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# $4 = minor revision number ('y')
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expand_version_pattern()
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{
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expanded=${1//VER/$2}
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expanded=${expanded//MAJ/$3}
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echo ${expanded//MIN/$4}
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}
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# function get_running_kver()
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# Print the upstream version of the currently running kernel
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# i.e. < w.x[.y] > without any trailing distro-specific version
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get_running_kver()
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{
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uname -r | cut -d '-' -f 1
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}
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# function split_version_string()
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# Split a 'w.x.y' version string into separate values.
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# Set $PRAWNOS_KVER_VER with the main version number ('w').
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# Set $PRAWNOS_KVER_MAJ wiht the major revision number ('x').
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# Set $PRAWNOS_KVER_MIN with the minor revision number ('y').
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# Return 0 on success, return 1 on failure.
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# $1 = version string in the 'w.x.y' format
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split_version_string()
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{
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# ver=$1
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# IFS='.' read -ra vscheme <<< "$ver"
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# PRAWNOS_KVER_VER=${vscheme[0]}
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# PRAWNOS_KVER_MAJ=${vscheme[1]}
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# PRAWNOS_KVER_MIN=${vscheme[2]}
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anynum="[0-9]{1,}"
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match_ver="($anynum)\.($anynum)\.($anynum)"
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if [[ $target =~ $search_fmt ]];then
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PRAWNOS_KVER_VER=${BASH_REMATCH[1]}
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PRAWNOS_KVER_MAJ=${BASH_REMATCH[2]}
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PRAWNOS_KVER_MIN=${BASH_REMATCH[3]}
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return 0
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else
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return 1
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fi
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}
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# function rsync_list_remote()
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# List contents of remote directory via rsync.
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# Return rsync's exit code.
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# $1 = remote rsync url to be listed
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rsync_list_remote()
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{
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rsync --timeout=$remote_timeout --list-only "$1" 2>&1
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ec=$?
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# rsync exit codes 30, 35 = timeout
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case $ec in
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30|35)
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print_warn "rsync timeout while connecting to remote server"
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if [ $remote_retries -lt 1 ];then
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return $ec
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fi
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export remote_retries=$(( remote_retries - 1 ))
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print_warn "Waiting $remote_wait_retry seconds before retrying"
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sleep $remote_wait_retry
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rsync_list_remote $@
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return $?
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;;
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*)
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return $ec
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;;
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esac
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}
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# function rsync_search_url_pattern()
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# Search $src_url for the presence of a file
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# that matches $src_tar_pattern.
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# Print the bare file name matching the search.
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# $1 = main version number ('w')
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# $2 = major revision number ('x')
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rsync_search_url_pattern()
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{
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file_pattern=$(expand_version_pattern \
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"$src_url/$src_tar_pattern" $1 $2 "*")
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print_msg "Attempting to list remote file pattern $file_pattern..."
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file=$(rsync_list_remote $file_pattern)
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ec=$?
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if [ $ec -ne 0 ];then
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print_err "Failed to list remote file pattern"
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print_err "Output from rsync:"
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print_err "$file"
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return $ec
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fi
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fields=( $file )
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echo ${fields[-1]}
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}
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# function wget_search_url_pattern()
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# Search $src_url for an 'href' pointing to a file
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# that matches $src_tar_pattern.
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# Print the bare file name matching the search.
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# $1 = main version number ('w')
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# $2 = major revision number ('x')
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wget_search_url_pattern()
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{
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baseurl=$(expand_version_pattern "$src_url" "$1" "$2")
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outfile=$(tempfile)
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wget --timeout=$remote_timeout \
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--tries=$(( $remote_retries + 1 )) \
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--output-document="$outfile" \
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"$baseurl"
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ec=$?
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if [ $? -ne 0 ];then
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print_err "Failed to download url with wget."
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return $ec
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fi
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search_string=$(expand_version_pattern $src_tar_pattern "$1" "$2" "*")
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grep -o "href=\"$search_string\"" "$outfile" | grep -o "$search_string"
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rm "$outfile"
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}
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# function parse_value_from_template()
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# Match "$target" against "$template" and print
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# the first occurrence in "$target"
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# that matches the "$placeholder" part in "$template"
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# i.e. parse "$placeholder" out of "$target" using "$template"
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# $1 = template
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# $2 = target
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# $3 = placeholder
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# $4 = matching pattern
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parse_value_from_template()
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{
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template=$1
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target=$2
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phold=$3
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# replace $phold with a matching group in $template
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search_fmt=$(sed "s/$phold/($4)/g" <<< $template)
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[[ $target =~ $search_fmt ]] &&
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echo ${BASH_REMATCH[1]}
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}
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# function parse_version_from_filname()
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# Extract the version string from the given filename
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# and print it to stdout
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# $1 = filename matching $src_tar_pattern
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parse_version_from_filename()
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{
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if [ -z "$1" ];then
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print_err "Failed parsing version: empty file name received;"
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return 1
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fi
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anynum="[0-9]{1,}"
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set -x
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template_ver=$(expand_version_pattern "$src_tar_pattern" "VER" "$anynum" "$anynum")
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template_maj=$(expand_version_pattern "$src_tar_pattern" "$anynum" "MAJ" "$anynum")
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template_min=$(expand_version_pattern "$src_tar_pattern" "$anynum" "$anynum" "MIN")
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ver=$(parse_value_from_template "$template_ver" "$1" "VER" "$anynum")
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maj=$(parse_value_from_template "$template_maj" "$1" "MAJ" "$anynum")
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min=$(parse_value_from_template "$template_min" "$1" "MIN" "$anynum")
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echo "${ver}.${maj}.${min}"
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}
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# function get_latest_src_kver()
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# Check the upstream url for the latest source release.
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# Print the latest version available in the format 'w.x.y'
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# $1 = main version number ('w')
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# $2 = major revision number ('x')
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get_latest_src_kver()
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{
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case $remote_tool in
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wget)
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fname=$(wget_search_url_pattern $1 $2)
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;;
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rsync)
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fname=$(rsync_search_url_pattern $1 $2)
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;;
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*)
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print_err "Unknown remote tool: $remote_tool"
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return 1
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esac
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echo $fname
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parse_version_from_filename "$fname"
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}
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