snap-slack/hooks/slackpkg-pre-install.sh

#!/bin/bash
# SlackPkg Pre-install Hook for snap-slack
# Place this in /etc/slackpkg/hooks/pre-install.sh

# Configuration
SNAP_SLACK=/usr/bin/snap-slack
ENABLE_AUTO_SNAPSHOTS=1  # Set to 0 to disable automatic snapshots
MAX_PACKAGE_COUNT=100    # Maximum number of packages to include in snapshot name

# Check if snap-slack is installed
if [ ! -x "$SNAP_SLACK" ]; then
    echo "WARNING: snap-slack not found at $SNAP_SLACK, skipping pre-install snapshot"
    exit 0
fi

# Check if auto snapshots are enabled
if [ "$ENABLE_AUTO_SNAPSHOTS" != "1" ]; then
    echo "INFO: Automatic snapshots are disabled in slackpkg hook"
    exit 0
fi

# Function to create a snapshot
create_snapshot() {
    local desc="$1"
    echo "Creating snapshot before package operations: $desc"
    $SNAP_SLACK create --description "$desc"
}

# Get the operation being performed
OPERATION="$1"
shift
PACKAGES="$@"

# Create appropriate snapshot based on operation
case "$OPERATION" in
    upgrade-all)
        create_snapshot "pre-upgrade-all"
        ;;
    install|upgrade)
        # Limit the number of packages in the snapshot name for readability
        if [ "$(echo $PACKAGES | wc -w)" -gt $MAX_PACKAGE_COUNT ]; then
            PKG_COUNT=$(echo $PACKAGES | wc -w)
            create_snapshot "pre-$OPERATION-$PKG_COUNT-packages"
        else
            create_snapshot "pre-$OPERATION-$(echo $PACKAGES | tr ' ' '-')"
        fi
        ;;
    remove)
        if [ "$(echo $PACKAGES | wc -w)" -gt $MAX_PACKAGE_COUNT ]; then
            PKG_COUNT=$(echo $PACKAGES | wc -w)
            create_snapshot "pre-remove-$PKG_COUNT-packages"
        else
            create_snapshot "pre-remove-$(echo $PACKAGES | tr ' ' '-')"
        fi
        ;;
    *)
        # For other operations, create a generic snapshot
        create_snapshot "pre-slackpkg-operation"
        ;;
esac

exit 0