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dnfPackageLookup.bash
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dnfPackageLookup.bash
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#!/bin/bash
# script to periodically check for new dnf package updates when the system is "deemed iddle"
# ie. less than half of the cores are in use in the 5 min load average
#
# the list of new package updates are written to the output file: /tmp/conky/dnf.packages.formatted
# conky ${color} variables are added in order to highlight packages of interest to the user
. ~/conky/monochrome/logging.bash
function usage {
cat <<-END
$(basename $0) [--package-width n] [--version-width n] [--offset n] [--interval x]
where package width is the number of characters to print for the pacakge name
version width is the number of characters to print for the version number
offset is the number of pixels between the package name and its version number
interval is the wait time between queries, use a time range compatible with the sleep command, ex. 1h
END
}
function onExitSignal {
log 'received shutdown signal, deleting output file'
rm -f ${outputDir}/dnf.packages.formatted # file read by conky, other files are left for debugging
[[ $pid ]] && kill $pid
exit 0
}
trap onExitSignal EXIT
if ! type dnf > /dev/null 2>&1; then
msg="your linux distro does not use the 'dnf' package manager\n"
msg="${msg}the package updates conky will not be operational\n"
msg="${msg}you will have to update this script to work with your distro's package manager"
logError "$msg"
exit 1
fi
packageWidth=21 # number of characters to print for the package name
versionWidth=7 # number of characters to print for the version number
offset=11 # number of pixels between the package name and its version number
interval=15m # wait time between queries to the package repository
while (( "$#" )); do
case $1 in
--offset)
[[ -z $2 ]] && { logError "provide a value for the $1 flag"; exit 1; }
offset=$2
shift 2
;;
--package-width)
[[ -z $2 ]] && { logError "provide a value for the $1 flag"; exit 1; }
packageWidth=$2
shift 2
;;
--version-width)
[[ -z $2 ]] && { logError "provide a value for the $1 flag"; exit 1; }
versionWidth=$2
shift 2
;;
--interval)
[[ -z $2 ]] && { logError "provide a value for the $1 flag"; exit 1; }
interval=$2
shift 2
;;
*)
usage
exit 1
;;
esac
done
[[ ${offset} -lt 1 ]] && { logError 'offset should be greater than 0'; exit 1; }
[[ ${packageWidth} -lt 1 ]] && { logError 'package name width should greater than 0'; exit 1; }
[[ ${versionWidth} -lt 1 ]] && { logError 'version width (--version-width) should greater than 0'; exit 1; }
log 'starting dnf repo package lookup'
log "checking for package updates every ${interval}"
log "new package updates format will be ${packageWidth} | offset ${offset} | ${versionWidth}"
outputDir=/tmp/conky
mkdir -p ${outputDir}
totalCores=$(grep -c processor /proc/cpuinfo)
halfCores=$(( totalCores / 2 ))
log "system will be deemed iddle if the 5 min cpu load average is less than ${halfCores}"
while [ true ]; do
# the output format of `uptime` changes if the machine runs for longer than a day
# 1m 5m 15m
# within a day: 12:20:31 up 37 min, 1 user, load average: 0.86, 0.73, 0.66
# more than a day: 22:54:03 up 2 days, 2:12, 1 user, load average: 0.53, 1.16, 1.40
loadAvg=$(uptime)loa
loadAvg=$(cut -d, -f2 <<< "${loadAvg#*load average: }" | tr -d ' ')
log "5 min load avg = $loadAvg"
# perform dnf lookup if the system is iddle
if [[ $loadAvg < $halfCores ]]; then
packagesRawFile=${outputDir}/dnf.updates.source # raw output from the dnf command
# sample dnf output to parse:
#
# PM Fusion for Fedora 32 - Free - Updates 5.8 kB/s | 2.9 kB 02:00
# RPM Fusion for Fedora 32 - Nonfree - Updates 0.0 B/s | 0 B 02:00
# Last metadata expiration check: 0:15:45 ago on Mon 16 Aug 2021 10:29:07 AM EDT.
# Available Upgrades
# code.x86_64 1.59.0-1628120127.el8 code
# containers-common.noarch 4:1-82.fc37 updates
dnf list updates > ${packagesRawFile}
regex='^(([[:alnum:]]|\.|_|:|-)+[[:blank:]]+){2}([[:alnum:]]|\.|_|-|[[:blank:]])+$'
packages=$(grep -cE $regex ${packagesRawFile})
if (( packages > 0 )); then
log "$packages new package update(s)"
packagesFile=${outputDir}/dnf.packages # file to list the new packages
# extract the actual packages from the raw dnf data
grep -E $regex ${packagesRawFile} > ${packagesFile}
# formatting done to the new package list for conky to display it nicely
# - package name and version is converted into a tabular layout
# - packages of interest are surrounded by a ${color} variable in order to have them highlighted
highlightRegex='kernel\|firefox\|transmission'
cat ${packagesFile} \
| sort --ignore-case \
| awk "{ printf \"%-${packageWidth}.${packageWidth}s\${offset ${offset}}%${versionWidth}.${versionWidth}s\n\", \$1, \$2 }" \
| sed "s:\($highlightRegex\):$\{color2\}\1$\{color\}:" > ${outputDir}/dnf.packages.formatted
else
log 'no updates available'
rm -f ${outputDir}/dnf.packages*
fi
else
log 'load average too high, trying again later'
fi
log "checking for updates again in ${interval}"
sleep ${interval} & pid=$!
wait
unset pid
done