93 lines
3.7 KiB
Bash
Executable File
93 lines
3.7 KiB
Bash
Executable File
#!/bin/bash
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#
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# A replacement of the logrotate's copytruncate method to use when:
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# * we haven't permission to change ownership, so the built-in copytruncate
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# method would fail (this is a bug in logrotate, I think);
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# * we haven't permission to reload the service, so the create new log method
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# doesn't work - the service would still write to the already rotated file.
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#
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# This script, when called as a prerotate script from logrotate configuration:
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# * copytruncates a file having $LOGEXT (see below) extesion and compresses it
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# (and returns with 1 exit code, thus, the logrotate will skip this file).
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# * does nothing with files having any other extensions - e.g .1, .2 and so on
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# (and returns with 0 exit code, thus, the logrotate can process this file);
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#
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# In other words, with default settings it simulates the effect of logrotate
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# configuration options below:
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# <pathname>/*.log {
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# dateext
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# dateyesterday
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# dateformat %Y-%m-%d.
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# extension log
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# compress
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# copytruncate
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# [...]
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# }
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# but doesn't stop if failed to set the permissions during copytruncate.
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#
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# The script receives the file to process as it's first command line parameter.
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# Lack of the parameter it simply does nothing.
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#
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# Author: Kovács Zoltán <kovacs.zoltan@smartfront.hu>
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# Kovács Zoltán <kovacsz@marcusconsulting.hu>
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# License: GNU/GPL v3+ (https://www.gnu.org/licenses/gpl-3.0.en.html)
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# 2023-06-18 v1.0
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# new: forked from the "SMARTERP_skeleton" repository.
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# 2020-11-09 v0.1 Initial release
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# Configurable parameters - must be consistent with the logrotate configuration.
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#
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DATESTRING="$(date "+%Y-%m-%d" -d '1 day ago')" # Yesterday goes to the filename
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LOGEXT="log" # Processes only *.$LOGEXT files
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# Messages.
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MSG_MISSINGDEP="Fatal: missing dependency"
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# Checks the dependencies.
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TR=$(which tr 2>/dev/null)
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if [ -z "$TR" ]; then echo "$MSG_MISSINGDEP tr."; exit 1 ; fi
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for item in basename cp dirname gzip
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do
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if [ -n "$(which $item)" ]
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then export $(echo $item | "$TR" '[:lower:]' '[:upper:]')=$(which $item)
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else echo "$MSG_MISSINGDEP $item." >&2; exit 1; fi
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done
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# All dependencies are available via "$THECOMMAND" (upper case) call.
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#
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# An additional bugfix (use "$(which gzip)" instead of "$GZIP"):
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# https://www.gnu.org/software/gzip/manual/html_node/Environment.html
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GZIP=""
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# Lack of the parameter (unlikely) it simply does nothing.
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# The script returns an OK status, so the logrotate will continue.
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[[ -z "$1" ]] && exit 0
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# Parses the parameter.
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LOGDIR="$("$DIRNAME" $1)"
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LOGFILE="$("$BASENAME" $1)"
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NEWFILE="${LOGFILE%.*}.$DATESTRING.${LOGFILE##*.}"
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# If the parameter doesn't point to a writeable file it simply does nothing.
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[[ ! -w "$LOGDIR/$LOGFILE" ]] && exit 0
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# If the log's folder isn't writable it simply does nothing.
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[[ ! -w "$LOGDIR" ]] && exit 0
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# If the extension doesn't match it simply does nothing.
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[[ "${LOGFILE##*.}" != "$LOGEXT" ]] && exit 0
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# Cases above must handled by the logrotate itself.
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# The script returns an OK status, so the logrotate will continue.
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# Doesn't copy if it would overwrite something.
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# Returns an error status, so the logrotate won't process this file.
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[[ -e "$LOGDIR/$NEWFILE" ]] && exit 1
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[[ -e "$LOGDIR/$NEWFILE.gz" ]] && exit 1
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# Tries to copy the current logfile.
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"$CP" -p "$LOGDIR/$LOGFILE" "$LOGDIR/$NEWFILE" # >/dev/null 2>&1
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# On error returns an error status so the logrotate won't process this file.
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[[ ! -r "$LOGDIR/$NEWFILE" ]] && exit 1
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# Done with copy. Tries to empty the current logfile. Doesn't check the result.
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: >"$LOGDIR/$LOGFILE"
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# Compresses the rotated logfile. Doesn't check the result.
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"$(which gzip)" "$LOGDIR/$NEWFILE" #>/dev/null 2>&1
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# Returns a fake error status to prevent the logrotate to process this file.
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exit 1
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# That's all, Folks! :) |