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#!/bin/bash
# Function to display usage
usage() {
echo "Usage: $0 --dir <dir1> [<dir2> ...] [--min-free-space <space_in_GiB>] [--debug]" 1>&2
}
# Function to output error messages and exit
error_msg() {
echo "Error: $1" 1>&2
exit 1
}
# Function to output debug messages
debug_msg() {
if $DEBUG_MODE; then
echo "$1"
fi
}
# Initialize variables
declare -a DIRS
MIN_FREE_SPACE=200 # Default minimum free space in GiB
DEBUG_MODE=false
PARSE_DIRS=false
# Parse command-line arguments
for arg in "$@"; do
if $PARSE_DIRS; then
if [[ "$arg" =~ ^-- ]]; then
PARSE_DIRS=false
else
DIRS+=("$arg")
continue
fi
fi
case $arg in
--dir)
PARSE_DIRS=true
;;
--min-free-space)
MIN_FREE_SPACE="$2"
shift # Remove argument value
;;
--debug)
DEBUG_MODE=true
;;
*)
if [ "$arg" != "${DIRS[-1]}" ]; then
usage
error_msg "Unknown parameter passed: $arg"
fi
;;
esac
done
# Check if at least one directory is provided and if it is indeed a directory
if [ ${#DIRS[@]} -eq 0 ]; then
usage
error_msg "No directories specified."
fi
for DIR in "${DIRS[@]}"; do
if [ ! -d "$DIR" ]; then
error_msg "'$DIR' is not a directory."
fi
done
# Check if all directories are on the same disk
PREV_DISK=""
for DIR in "${DIRS[@]}"; do
CURRENT_DISK=$(df "$DIR" | tail -n 1 | awk '{print $1}')
if [ -n "$PREV_DISK" ] && [ "$PREV_DISK" != "$CURRENT_DISK" ]; then
usage
error_msg "Directories are not on the same disk."
fi
PREV_DISK=$CURRENT_DISK
done
# Convert GiB to KiB (as df outputs in KiB)
MIN_FREE_SPACE_KiB=$((MIN_FREE_SPACE * 1024 * 1024))
# Get the free space on the disk where the directories are located
FREE_SPACE_KiB=$(df "${DIRS[0]}" | tail -n 1 | awk '{print $4}')
# Find files (not directories) in all specified directories, sort them by modification time (oldest first)
if [ $FREE_SPACE_KiB -lt $MIN_FREE_SPACE_KiB ]; then
debug_msg "Less than $MIN_FREE_SPACE GiB free, cleaning up..."
find "${DIRS[@]}" -type f -printf '%T+ %p\n' | sort | while IFS= read -r line; do
if [ $(df "${DIRS[0]}" | tail -n 1 | awk '{print $4}') -ge $MIN_FREE_SPACE_KiB ]; then
break
fi
FILE=$(echo "$line" | cut -d ' ' -f2-)
debug_msg "Deleting $FILE"
rm -f -- "$FILE"
REMAINING_SPACE_KiB=$(df "${DIRS[0]}" | tail -n 1 | awk '{print $4}')
debug_msg "Remaining space: $((REMAINING_SPACE_KiB / 1024 / 1024)) GiB"
done
else
debug_msg "Enough free space available."
fi
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