#!/bin/sh -e
#
# repo sync script (env-based: REPOSYNC_*)
#

log() {
    msg="$1"
    if [ "$LOG" ]; then
        echo "$(date +'%Y-%m-%d %H:%M:%S') $msg" | tee -a "$LOGFILE"
    else
        echo "$msg"
    fi
}

run_cmd() {
    if [ "$DRY_RUN" ]; then
        log " [dry-run] $*"
    else
        log " $*"
        eval "$@"
    fi
}

syncrepo() {
    url=$1
    branch=$2
    path=$3

    [ -z "$url" ] && return 0

    if [ -z "$path" ]; then
        log "error: invalid repo format (missing path)"
        return 1
    fi

    if [ "$FORCE" ] && [ -d "$path" ]; then
        log "=> Force removing repo directory $path..."
        run_cmd "rm -rf \"$path\""
    fi

    if [ ! -d "$path/.git" ]; then
        log "=> Cloning repo into $path..."
        run_cmd "mkdir -p \"$path\""
        run_cmd "git clone --branch \"$branch\" --single-branch \"$url\" \"$path\""
    else
        log "=> Updating repo $path..."
        run_cmd "cd \"$path\" && git fetch origin \"$branch\""
        run_cmd "cd \"$path\" && git reset --hard \"origin/$branch\""
        run_cmd "cd \"$path\" && git clean -fdx"
    fi
}

usage() {
    echo "Usage: $0 [-n|-l|-f]"
    echo " -n  dry-run"
    echo " -l  logging (/var/log/reposync.log)"
    echo " -f  force sync"
    exit 1
}

# --- args ---
while [ "$1" ]; do
    case "$1" in
        -n) DRY_RUN=1;;
        -l) LOG=1;;
        -f) FORCE=1;;
        -h) usage;;
    esac
    shift
done

# --- checks ---
command -v git >/dev/null 2>&1 || {
    echo "error: git is not installed." >&2
    exit 1
}

LOGFILE="/var/log/reposync.log"

REPOS=$(env | grep '^REPOSYNC_' | sort || true)

if [ -z "$REPOS" ]; then
    echo "error: no REPOSYNC_* variables found." >&2
    exit 1
fi

echo "$REPOS" | while IFS='=' read -r name value; do
    IFS='|' read -r url branch path _ <<EOF
$value
EOF

    [ -z "$url" ] && continue

    syncrepo "$url" "$branch" "$path"
done

exit 0