#!/usr/bin/env bash
#
#  This script will preserve the normally rotated and
#  thrown away weblogs from a default RedHat/Apache installation.
#  It will save the files with a date/time stamp in the filename,
#  bzipped, to a given directory.
#
#  Run this from crontab nightly at an off hour,
#  as bzip2 can suck up some serious CPU on huge logs:
#  0 2 * * * /opt/sbin/archiveweblogs.sh
#
# SPDX-License-Identifier: MIT

PROBLEM=66

# Set this to your backup dir.
BKP_DIR=/opt/backups/weblogs

# Default Apache/RedHat stuff
LOG_DAYS="4 3 2 1"
LOG_DIR=/var/log/httpd
LOG_FILES="access_log error_log"

# Default RedHat program locations
LS=/bin/ls
MV=/bin/mv
ID=/usr/bin/id
CUT=/bin/cut
COL=/usr/bin/column
BZ2=/usr/bin/bzip2

# Are we root?
USER=$($ID -u)
if [ "X$USER" != "X0" ]; then
  echo "PANIC: Only root can run this script!"
  exit $PROBLEM
fi

# Backup dir exists/writable?
if [ ! -x "$BKP_DIR" ]; then
  echo "PANIC: $BKP_DIR doesn't exist or isn't writable!"
  exit $PROBLEM
fi

# Move, rename and bzip2 the logs
for logday in $LOG_DAYS; do
  for logfile in $LOG_FILES; do
    MYFILE="$LOG_DIR/$logfile.$logday"
    if [ -w "$MYFILE" ]; then
      DTS=$($LS -lgo --time-style=+%Y%m%d "$MYFILE" | $COL -t | $CUT -d ' ' -f7)
      $MV "$MYFILE" "$BKP_DIR/$logfile.$DTS"
      $BZ2 "$BKP_DIR/$logfile.$DTS"
    else
      # Only spew an error if the file exits (ergo non-writable).
      if [ -f "$MYFILE" ]; then
        echo "ERROR: $MYFILE not writable. Skipping."
      fi
    fi
  done
done

exit 0