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56 lines
2 KiB
Bash
Executable file
56 lines
2 KiB
Bash
Executable file
#!/bin/bash
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# Script to perform incremental backups using rsync
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# It is often ran as crontab rule for automated backup solution
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#
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# This script will respect .rsync-filter files, which can be used
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# to define custom exclude rules for files/dirs in which it is present
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if [ $# -lt 2 ]; then
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echo "Invalid amount of arguments passed!"
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echo "Arguments: <Source path> <Backup path> [--note]"
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echo " <Source path>: directory to be backed up, usually '/'"
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echo " <Backup path>: directory to back up to (destination), usually mounted drive"
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exit
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fi
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SOURCE_DIR="$1"
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BACKUP_DIR="$2"
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DATETIME="$(date '+%Y-%m-%d_%H:%M:%S')"
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BACKUP_PATH="${BACKUP_DIR}/${DATETIME}"
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LATEST_LINK="${BACKUP_DIR}/latest"
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NOTE_FILE="${BACKUP_PATH}/note.md"
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mkdir -p "$BACKUP_DIR"
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rsync -avHAXS \
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--delete \
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--filter='dir-merge /.rsync-filter' \
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--link-dest "${LATEST_LINK}" \
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"${@:3}" "${SOURCE_DIR}/" "${BACKUP_PATH}"
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# Only attempt to override the symlink if we made new backup_path
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# user might've passed --dry-run option in which case we wouldn't
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# want to override latest symlink to non-existent location
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if [ -d "${BACKUP_PATH}" ]; then
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rm "${LATEST_LINK}" 2>/dev/null
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ln -s "$(basename "$BACKUP_PATH")" "${LATEST_LINK}"
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fi
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# Lastly, open a note file with $EDITOR insite of the backup dir,
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# so the user can put in any personal notes about this backup (such
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# as reason it was made, making it easy to identify it).
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#
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# If this command is ran with sudo (like for system wide backups),
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# open the note file with user's editor, not root's
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if [ "${SUDO_USER:-$USER}" != "$USER" ]; then
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# Run command as the original user via sudo, with -s argument, to
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# also load the user's shell, so the user's env variables ($EDITOR)
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# gets set. Then make the user run sudoedit, opening a temp file,
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# which when saved, will get written to the note file as user we're
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# sudoed as. Note: this will re-prompt for sudo password.
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NOTE_FILE="$NOTE_FILE" sudo -s --preserve-env="NOTE_FILE" -u "$SUDO_USER" sh -c 'sudoedit -u "$SUDO_USER" "$NOTE_FILE"'
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else
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$EDITOR "$NOTE_FILE"
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fi
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