script.sh

#!/usr/bin/env bash

# Set parent directory path
parent_path=$(
    cd "$(dirname "${BASH_SOURCE[0]}")"
    pwd -P
)

# Initialize variables from .env file
source "$parent_path"/.env

backup_folder="config_backup"
backup_path="$HOME/$backup_folder"
empty_commit=${empty_commit:-"yes"}
git_protocol=${git_protocol:-"https"}
git_host=${git_host:-"github.com"}
full_git_url=$git_protocol"://"$github_token"@"$git_host"/"$github_username"/"$github_repository".git"
exclude=${exclude:-"*.swp" "*.tmp" "printer-[0-9]*_[0-9]*.cfg" "*.bak" "*.bkp" "*.csv" "*.zip"}

# Check for updates
[ $(git -C "$parent_path" rev-parse HEAD) = $(git -C "$parent_path" ls-remote $(git -C "$parent_path" rev-parse --abbrev-ref @{u} | sed 's/\// /g') | cut -f1) ] && echo -e "Klipper-backup is up to date\n" || echo -e "NEW klipper-backup version available!\n"

# Check if backup folder exists, create one if it does not
if [ ! -d "$backup_path" ]; then
    mkdir -p "$backup_path"
fi

# Git commands
cd "$backup_path"
# Check if .git exists else init git repo
if [ ! -d ".git" ]; then
    mkdir .git
    echo "[init]
    defaultBranch = "$branch_name"" >>.git/config #Add desired branch name to config before init
    git init
# Check if the current checked out branch matches the branch name given in .env if not branch listed in .env
elif [[ $(git symbolic-ref --short -q HEAD) != "$branch_name" ]]; then
    echo -e "Branch: $branch_name in .env does not match the currently checked out branch of: $(git symbolic-ref --short -q HEAD)."
    # Create branch if it does not exist
    if git show-ref --quiet --verify "refs/heads/$branch_name"; then
        git checkout "$branch_name" >/dev/null
    else
        git checkout -b "$branch_name" >/dev/null
    fi
fi

# Check if username is defined in .env
if [[ "$commit_username" != "" ]]; then
    git config user.name "$commit_username"
else
    git config user.name "$(whoami)"
    sed -i "s/^commit_username=.*/commit_username=\"$(whoami)\"/" "$parent_path"/.env
fi

# Check if email is defined in .env
if [[ "$commit_email" != "" ]]; then
    git config user.email "$commit_email"
else
    unique_id=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 7 | head -n 1)
    user_email=$(whoami)@$(hostname --short)-$unique_id
    git config user.email "$user_email"
    sed -i "s/^commit_email=.*/commit_email=\"$user_email\"/" "$parent_path"/.env
fi

# Check if remote origin already exists and create if one does not
if [ -z "$(git remote get-url origin 2>/dev/null)" ]; then
    git remote add origin "$full_git_url"
fi

# Check if remote origin changed and update when it is
if [[ "$full_git_url" != $(git remote get-url origin) ]]; then
    git remote set-url origin "$full_git_url"
fi

# Check if branch exists on remote (newly created repos will not yet have a remote) and pull any new changes
if git ls-remote --exit-code --heads origin $branch_name >/dev/null 2>&1; then
    git pull origin "$branch_name"
    # Delete the pulled files so that the directory is empty again before copying the new backup
    # The pull is only needed so that the repository nows its on latest and does not require rebases or merges
    find "$backup_path" -maxdepth 1 -mindepth 1 ! -name '.git' ! -name 'README.md' -exec rm -rf {} \;
fi

cd "$HOME"
while IFS= read -r path; do
    # Check if path is a directory or not a file (needed for /* checking as /* treats the path as not a directory)
    if [[ -d "$HOME/$path" || ! -f "$HOME/$path" ]]; then
        # Check if path does not end in /* or /
        if [[ ! "$path" =~ /\*$ && ! "$path" =~ /$ ]]; then
            path="$path/*"
        elif [[ ! "$path" =~ \$ && ! "$path" =~ /\*$ ]]; then
            path="$path*"
        fi
    fi
    # Check if path contains files
    if compgen -G "$HOME/$path" >/dev/null; then
        # Iterate over every file in the path
        for file in $path; do
            # Check if it's a symbolic link
            if [ -h "$file" ]; then
                echo "Skipping symbolic link: $file"
            # Check if file is an extra backup of printer.cfg moonraker/klipper seems to like to make 4-5 of these sometimes no need to back them all up as well.
            elif [[ $(basename "$file") =~ ^printer-[0-9]+_[0-9]+\.cfg$ ]]; then
                echo "Skipping file: $file"
            else
                rsync -Rr "$file" "$backup_path/"
            fi
        done
    fi
done < <(grep -v '^#' "$parent_path/.env" | grep 'path_' | sed 's/^.*=//')

cp "$parent_path"/.gitignore "$backup_path/.gitignore"

# utilize gits native exclusion file .gitignore to add files that should not be uploaded to remote.
# Loop through exclude array and add each element to the end of .gitignore
for i in ${exclude[@]}; do
    # add new line to end of .gitignore if there is not one
    [[ $(tail -c1 "$backup_path/.gitignore" | wc -l) -eq 0 ]] && echo "" >>"$backup_path/.gitignore"
    echo $i >>"$backup_path/.gitignore"
done

# Individual commit message, if no parameter is set, use the current timestamp as commit message
if [ -n "$1" ]; then
    commit_message="$@"
else
    commit_message="New backup from $(date +"%x - %X")"
fi

cd "$backup_path"
# Create and add Readme to backup folder if it doesn't already exist
if ! [ -f "README.md" ]; then
    echo -e "# klipper-backup 💾 \nKlipper backup script for manual or automated GitHub backups \n\nThis backup is provided by [klipper-backup](https://github.com/Staubgeborener/klipper-backup)." >"$backup_path/README.md"
fi
# Untrack all files so that any new excluded files are correctly ignored and deleted from remote
git rm -r --cached . >/dev/null 2>&1
git add .
git commit -m "$commit_message"
# Check if HEAD still matches remote (Means there are no updates to push) and create a empty commit just informing that there are no new updates to push
if [[ "$empty_commit" = "yes" && $(git rev-parse HEAD) == $(git ls-remote $(git rev-parse --abbrev-ref @{u} 2>/dev/null | sed 's/\// /g') | cut -f1) ]]; then
    git commit --allow-empty -m "$commit_message - No new changes pushed"
fi
git push -u origin "$branch_name"

# Remove files except .git folder after backup so that any file deletions can be logged on next backup
find "$backup_path" -maxdepth 1 -mindepth 1 ! -name '.git' ! -name 'README.md' -exec rm -rf {} \;