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#!/usr/bin/env bash
# A script to upgrade a RHEL derivative (Fedora, CentOS, ...). If you have ansible or puppet:
# this is way more simple with an automation framework. This script works with the paradigm
# that you only have a bash available and you want to see what happens without being murdered
# by gazillions of output lines.
# This script avoids combining options, e.g. dnf -C -q instead of dnf -Cq, since
# dnf is perfectly capable of POSIX standards, but yum fails at combined parameters.
# So we'll leave it this way in case of conversion of this script to yum or extension
# to be capable of both. (tl;dr no combined options because yum sucks at POSIX standards)
ROK="\033[666D[ \033[32mOK\033[0m ]\033[u\033[K"
RWRN="\033[666D[\033[33mWARN\033[0m]\033[u\033[K"
RERR="\033[666D[\033[31mFAIL\033[0m]\033[u\033[K"
RINF="\033[666D[\033[37mINFO\033[0m]\033[u\033[K"
UPDAVAIL=1
SCMD="$(command -v snap 2>/dev/null)"
UCMD="$(command -v dnf 2>/dev/null)"
[ "$?" -ne 0 ]&&UCMD="$(command -v yum 2>/dev/null)"
[ -z "$UCMD" ]&&printf "Neither yum nor dnf found!\n" >&2&&exit 1
RETVAL=0
function radd {
[ -z "$1" ]&&return 1
printf "\033[666D\033[u\033[K \033[37m(%b)\033[0m" "$1"
}
function rbeg {
[ -z "$1" ]&&return 1
printf "[....] %b.\033[s.." "$1"
}
function rok {
case "$1" in
"") printf "%b\n" "$ROK";;
*)
printf "%b" "$ROK"
radd "$1"
printf "\n"
;;
esac
}
function rwrn {
case "$1" in
"") printf "%b\n" "$RWRN";;
*)
printf "%b" "$RWRN"
radd "$1"
printf "\n"
;;
esac
}
function rerr {
case "$1" in
"") printf "%b\n" "$RERR";;
*)
printf "%b" "$RERR"
radd "$1"
printf "\n"
;;
esac
}
function rinf {
case "$1" in
"") printf "%b\n" "$RINF";;
*)
printf "%b" "$RINF"
radd "$1"
printf "\n"
;;
esac
}
function supgrade {
printf "Listing updates...:\n"
sudo "${UCMD}" -C -q check-upgrade
case "$?" in
0|100) ;;
*) RETVAL=1;return 1;;
esac
rbeg "Upgrading system packages"
sudo "${UCMD}" -q -y upgrade
case "$?" in
0) rok;;
1)
rwrn "error occurred but was handled by dnf"
case "RETVAL" in
0) RETVAL=255;;
esac
;;
255)
rwrn "Upgrade done but updates remaining"
case "$RETVAL" in
0) RETVAL=255;;
esac
;;
*)
rerr
RETVAL=1;return 1
;;
esac
printf "Checking for outdated running services or necessity to reboot...:\n"
sudo "${UCMD}" needs-restarting
}
function snrefresh {
rbeg "Refreshing snapd snaps"
sudo "${SCMD}" refresh >/dev/null 2>&1
case "$?" in
0) rok;;
*) rerr;RETVAL=1;return 1;;
esac
}
rbeg "Updating dnf cache"
sudo "${UCMD}" -q makecache
case "$?" in
0) rok;;
100) rwrn;;
*) rerr;exit 1;;
esac
rbeg "Checking for upgrades"
sudo "${UCMD}" -C -q check-upgrade
case "$?" in
0)
rinf "No updates"
;;
100)
rok "Updates found"
UPDAVAIL=0
;;
esac
if [ "$UPDAVAIL" -eq 0 ];then
supgrade
fi
if [ ! -z "$SCMD" ];then
snrefresh
fi
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