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Use exec to redirect output to log instead of subshell

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Avoid forking a subshell by using exec to redirect output to log file.
Additional logging improvements are: Set filename at the top of script once
instead of hard-coding it throughout the script.  Log both stdout and stderr.
This commit is contained in:
Peter Ajamian 2021-05-07 16:22:45 +12:00
parent ce79f250ce
commit 029f172fe3
1 changed files with 7 additions and 6 deletions
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13
centos2rocky.sh
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@ -4,8 +4,12 @@
## Rocky is RC status. Using this script means you accept all risks of system instability. ## Rocky is RC status. Using this script means you accept all risks of system instability.
( # Path to logfile
# Pass everything to a subshell so the output can be piped to /var/log/centos2rocky.log logfile=/var/log/centos2rocky.log
# Send all output to the logfile as well as stdout.
truncate -s0 "$logfile"
exec > >(tee -a "$logfile") 2> >(tee -a "$logfile" >&2)
errcolor=$(tput setaf 1) errcolor=$(tput setaf 1)
nocolor=$(tput op) nocolor=$(tput op)
@ -81,7 +85,7 @@ final_message() {
} }
logmessage(){ logmessage(){
printf '%s\n' "${blue}A log of this installation can be found at /var/log/centos2rocky.log$nocolor" printf '%s\n' "${blue}A log of this installation can be found at $logfile$nocolor"
} }
## The actual work ## The actual work
@ -286,6 +290,3 @@ printf '\n\n\n'
cat /etc/issue | awk 'NR<=15' cat /etc/issue | awk 'NR<=15'
printf '%s\n' "$blue" "Done, please reboot your system.$nocolor" printf '%s\n' "$blue" "Done, please reboot your system.$nocolor"
logmessage logmessage
) | tee /var/log/centos2rocky.log
# Pipe output to /var/log/centos2rocky.log