quadlet-sync

#!/usr/bin/bash
# Script for simple git-ops

set -e

commit_state() {
    # Save current state
    if [ "$CURRENT_COMMIT" != "$LAST_COMMIT" ]; then
        echo -n "$CURRENT_COMMIT" > "$LAST_COMMIT_FILE"
    fi
}

WORKDIR="$HOME/.quadlet-sync"
mkdir -p "$WORKDIR" "$HOME/.config/containers"

if [ "$GIT_URL" == "" ] || [ "$GIT_SUBDIR" == "" ]; then
    echo "GIT_URL or GIT_SUBDIR not set!" && exit 1
fi

WORKDIR_GIT="$WORKDIR/git"
WORKDIR_GIT_SUBDIR="$WORKDIR_GIT/$GIT_SUBDIR"
WORKDIR_GIT_SUBDIR_QUADLETS="$WORKDIR_GIT_SUBDIR/quadlets"
TARGET_QUADLETS_DIR="$HOME/.config/containers/systemd"
LAST_COMMIT_FILE="$WORKDIR/last_commit"
touch "$LAST_COMMIT_FILE"

# Clone or pull
if [ ! -d "$WORKDIR_GIT" ]; then
    echo "Git workdir doesn't exist, cloning..."
    git clone "$GIT_URL" "$WORKDIR_GIT"
else
    if [ "$GIT_URL" != "$(git -C $WORKDIR_GIT remote get-url origin)" ]; then
        echo "GIT_URL changed! Please check the cached git dir remote!" && exit 1
    fi
    #echo "Git workdir exist, pulling latest changes..."
    git -C "$WORKDIR_GIT" pull > /dev/null
fi

# Check if subdir for this podman host exists
if [ ! -d "$WORKDIR_GIT_SUBDIR" ]; then
    echo "GIT_SUBDIR=$GIT_SUBDIR not found in git repo!" && exit 1
fi

if [ ! -d "$WORKDIR_GIT_SUBDIR_QUADLETS" ]; then
    echo "Quadlets dir not found in git repo subdir!" && exit 1
fi

# Symlink git dir to systemd path
if [ ! -d "$TARGET_QUADLETS_DIR" ]; then
    ln -s "$WORKDIR_GIT_SUBDIR_QUADLETS" "$TARGET_QUADLETS_DIR"
else
    if [ ! -L "$TARGET_QUADLETS_DIR" ]; then
        echo "Target quadlets dir is not symlink!" && exit 1
    fi
fi

# Check changed files since the last check
LAST_COMMIT=$(cat "$LAST_COMMIT_FILE")
CURRENT_COMMIT=$(git -C "$WORKDIR_GIT" rev-parse HEAD)
if [ "$LAST_COMMIT" != "" ]; then
    CHANGED_FILES=$(git -C "$WORKDIR_GIT" diff --name-only $LAST_COMMIT $CURRENT_COMMIT | grep "^$GIT_SUBDIR/" || true)
else
    CHANGED_FILES=$(git -C "$WORKDIR_GIT" ls-files | grep "^$GIT_SUBDIR/" || true)
fi

CADDY_RELOAD=""
CONTAINERS=""
if [ "$CHANGED_FILES" != "" ]; then
    echo "Following files changed:"
    for line in $CHANGED_FILES; do
        echo "  $line"
        if [[ "$line" == *".container" ]]; then
            CONTAINERS="$CONTAINERS $(basename $line)"
        fi
        if [[ "$line" == *"caddy.container" ]]; then
            CADDY_RELOAD="${CADDY_RELOAD}no"
        fi
        if [[ "$line" == *"/Caddyfile" ]]; then
            CADDY_RELOAD="${CADDY_RELOAD}yes"
        fi
    done
fi

if [ "$CONTAINERS" != "" ]; then
    # Some container relevant to current host changed - reload, restart and stop what's needed
    systemctl --user daemon-reload

    # (Re)Start added/changed containers
    NAME_FILTER=""
    for container in $CONTAINERS; do
        NAME_FILTER="$NAME_FILTER -f 'name=$container'"
    done
    UNITS=$(eval "podman quadlet list $NAME_FILTER --format '{{.UnitName}}'" | grep -v "UNIT" || true)
    for unit in $UNITS; do
        systemctl --user restart $unit
        echo "Restarted $unit"
    done

    # Stop deleted containers (possibly other non-container deleted services but there shouldn't be any)
    DELETED_UNITS=$(systemctl --user list-units --type=service --state=not-found --legend=false --plain | awk '{print $1};')
    for unit in $DELETED_UNITS; do
        systemctl --user stop $unit
        echo "Stopped $unit"
    done
else
    echo "No container files changed since the last pull."
fi

# Reload caddy if Caddyfile changed but container didn't
if [ "$CADDY_RELOAD" == "yes" ]; then
    podman exec -w /etc/caddy caddy caddy reload
fi

commit_state