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2026-05-25 03:31:08 +02:00
parent dbd6bf0324
commit a1a17e81a1
332 changed files with 174509 additions and 1106 deletions
@@ -0,0 +1,708 @@
+#!/usr/bin/env bash
+
+#########################################################################################
+#### gcp-snapshot-manager.sh — Create, rotate, list, audit, and restore GCP          ####
+#### persistent disk snapshots via gcloud CLI. Automated retention and fleet ops      ####
+#### Requires: bash 4+, gcloud CLI, jq                                              ####
+####                                                                                 ####
+#### Author: Phil Connor                                                             ####
+#### Contact: contact@mylinux.work                                                   ####
+#### License: MIT                                                                    ####
+#### Version 1.01                                                                    ####
+####                                                                                 ####
+#### Usage:                                                                          ####
+####   ./gcp-snapshot-manager.sh --snapshot --all                                     ####
+####                                                                                 ####
+#### See --help for all options.                                                     ####
+#########################################################################################
+
+set -euo pipefail
+
+# ── Colors (pre-initialized) ─────────────────────────────────────────
+RED="" GREEN="" YELLOW="" BLUE="" CYAN="" BOLD="" DIM="" RESET=""
+
+setup_colors() {
+    if [[ "${COLOR:-auto}" == "never" ]]; then
+        return
+    fi
+    if [[ "${COLOR:-auto}" == "always" ]] || [[ -t 1 ]]; then
+        RED='\033[0;31m'
+        GREEN='\033[0;32m'
+        YELLOW='\033[0;33m'
+        BLUE='\033[0;34m'
+        CYAN='\033[0;36m'
+        BOLD='\033[1m'
+        DIM='\033[2m'
+        RESET='\033[0m'
+    fi
+}
+
+# ── Logging ───────────────────────────────────────────────────────────
+log()     { echo -e "${BLUE}[INFO]${RESET} $*"; }
+warn()    { echo -e "${YELLOW}[WARN]${RESET} $*" >&2; }
+err()     { echo -e "${RED}[ERROR]${RESET} $*" >&2; }
+verbose() { if [[ "$VERBOSE" == "true" ]]; then echo -e "${DIM}[DEBUG]${RESET} $*"; fi; }
+die()     { err "$*"; exit 1; }
+
+section_header() {
+    echo ""
+    echo -e "  ${BOLD}${CYAN}── $1 ──${RESET}"
+    echo ""
+}
+
+field() {
+    printf "  ${BOLD}%-22s${RESET} %s\n" "$1" "$2"
+}
+
+field_color() {
+    printf "  ${BOLD}%-22s${RESET} %b\n" "$1" "$2"
+}
+
+elapsed() {
+    local end_time
+    end_time=$(date +%s)
+    echo "$(( end_time - START_TIME ))s"
+}
+
+# ── Defaults ──────────────────────────────────────────────────────────
+RUN_MODE=""
+ALSO_ROTATE="false"
+INSTANCE_NAME=""
+ZONE=""
+TARGET_ALL="false"
+SNAPSHOT_NAME=""
+KEEP="${GSM_KEEP:-3}"
+PREFIX="${GSM_PREFIX:-auto}"
+MAX_AGE="${GSM_MAX_AGE:-7}"
+OUTPUT_FORMAT="${GSM_FORMAT:-text}"
+DRY_RUN="true"
+FORCE="false"
+VERBOSE="${VERBOSE:-false}"
+COLOR="${COLOR:-auto}"
+GCP_PROJECT=""
+
+# ── State ─────────────────────────────────────────────────────────────
+SCRIPT_NAME="$(basename "$0")"
+readonly SCRIPT_NAME
+START_TIME=""
+SNAP_CREATED=0
+SNAP_DELETED=0
+SNAP_ERRORS=0
+
+# ── Dependency and credential checks ────────────────────────────────
+check_deps() {
+    command -v gcloud &>/dev/null || die "gcloud CLI is required"
+    command -v jq &>/dev/null || die "jq is required"
+}
+
+check_credentials() {
+    local account
+    account=$(gcloud auth list --filter="status:ACTIVE" --format="value(account)" 2>/dev/null)
+    [[ -z "$account" ]] && die "No active gcloud credentials — run 'gcloud auth login'"
+
+    if [[ -n "$GCP_PROJECT" ]]; then
+        gcloud config set project "$GCP_PROJECT" --quiet 2>/dev/null \
+            || die "Cannot set project: ${GCP_PROJECT}"
+    else
+        GCP_PROJECT=$(gcloud config get-value project 2>/dev/null)
+        [[ -z "$GCP_PROJECT" || "$GCP_PROJECT" == "(unset)" ]] && die "No project set — use --project or 'gcloud config set project'"
+    fi
+
+    log "Project: ${GCP_PROJECT}"
+}
+
+# ── Instance helpers ─────────────────────────────────────────────────
+get_all_instances() {
+    gcloud compute instances list --project "$GCP_PROJECT" --format=json 2>/dev/null
+}
+
+get_boot_disk() {
+    local instance="$1" zone="$2"
+    gcloud compute instances describe "$instance" --zone "$zone" --project "$GCP_PROJECT" \
+        --format='json(disks)' 2>/dev/null \
+        | jq -r '.disks[] | select(.boot == true) | .source' 2>/dev/null \
+        | rev | cut -d/ -f1 | rev
+}
+
+get_instance_zone() {
+    local instance_json="$1"
+    echo "$instance_json" | jq -r '.zone' | rev | cut -d/ -f1 | rev
+}
+
+# ── Snapshot helpers ─────────────────────────────────────────────────
+list_snapshots() {
+    gcloud compute snapshots list --project "$GCP_PROJECT" --format=json 2>/dev/null
+}
+
+managed_snapshots() {
+    list_snapshots | jq --arg pfx "$PREFIX" \
+        '[.[] | select(.name | startswith($pfx))]'
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          SNAPSHOT
+# ══════════════════════════════════════════════════════════════════════
+do_snapshot() {
+    local instances_json
+    instances_json=$(get_all_instances)
+
+    local instances
+    if [[ "$TARGET_ALL" == "true" ]]; then
+        instances="$instances_json"
+    elif [[ -n "$INSTANCE_NAME" ]]; then
+        instances=$(echo "$instances_json" | jq --arg n "$INSTANCE_NAME" '[.[] | select(.name == $n)]')
+    else
+        die "Specify --instance NAME or --all"
+    fi
+
+    local count
+    count=$(echo "$instances" | jq 'length')
+    [[ "$count" -eq 0 ]] && die "No instances found"
+
+    local target_label="$INSTANCE_NAME"
+    [[ "$TARGET_ALL" == "true" ]] && target_label="all (${count} instances)"
+
+    section_header "Creating Snapshots"
+    field "Target:" "$target_label"
+    field "Prefix:" "$PREFIX"
+    echo ""
+
+    echo "$instances" | jq -c '.[]' | while IFS= read -r inst; do
+        local name zone disk_name snap_name
+        name=$(echo "$inst" | jq -r '.name')
+        zone=$(get_instance_zone "$inst")
+        disk_name=$(get_boot_disk "$name" "$zone")
+        snap_name="${PREFIX}-${name}-$(date +%Y%m%d-%H%M%S)"
+
+        if [[ -z "$disk_name" ]]; then
+            echo -e "  ${RED}✗${RESET} ${name} (${zone})  no boot disk found"
+            ((SNAP_ERRORS++)) || true
+            continue
+        fi
+
+        verbose "Snapshotting ${name} disk ${disk_name} in ${zone}"
+
+        if gcloud compute snapshots create "$snap_name" \
+            --source-disk="$disk_name" \
+            --source-disk-zone="$zone" \
+            --project "$GCP_PROJECT" \
+            --labels="managed-by=gcp-snapshot-manager,source-instance=${name}" \
+            --quiet 2>/dev/null; then
+            echo -e "  ${GREEN}✓${RESET} ${name} (${zone})  ${snap_name}"
+            ((SNAP_CREATED++)) || true
+        else
+            echo -e "  ${RED}✗${RESET} ${name} (${zone})  failed"
+            ((SNAP_ERRORS++)) || true
+        fi
+
+        sleep 1
+    done
+
+    echo ""
+    field_color "Created:" "${GREEN}${SNAP_CREATED}${RESET}"
+    if [[ "$SNAP_ERRORS" -gt 0 ]]; then
+        field_color "Errors:" "${RED}${SNAP_ERRORS}${RESET}"
+    fi
+
+    if [[ "$ALSO_ROTATE" == "true" ]]; then
+        do_rotate
+    fi
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          ROTATE
+# ══════════════════════════════════════════════════════════════════════
+do_rotate() {
+    section_header "Rotating Snapshots"
+    field "Keep:" "$KEEP per instance"
+    field "Prefix:" "$PREFIX"
+    if [[ "$DRY_RUN" == "true" && "$FORCE" != "true" ]]; then
+        field "Mode:" "DRY RUN (use --force to delete)"
+    else
+        field "Mode:" "LIVE — deletions are permanent"
+    fi
+    echo ""
+
+    local snaps
+    snaps=$(managed_snapshots)
+
+    local instance_names
+    instance_names=$(echo "$snaps" | jq -r '.[].labels["source-instance"] // empty' | sort -u)
+
+    if [[ -z "$instance_names" ]]; then
+        log "No managed snapshots found matching prefix '${PREFIX}'"
+        return
+    fi
+
+    while IFS= read -r inst; do
+        [[ -z "$inst" ]] && continue
+        local inst_snaps
+        inst_snaps=$(echo "$snaps" | jq --arg inst "$inst" \
+            '[.[] | select(.labels["source-instance"] == $inst)] | sort_by(.creationTimestamp) | reverse')
+        local total
+        total=$(echo "$inst_snaps" | jq 'length')
+
+        if (( total <= KEEP )); then
+            verbose "${inst}: ${total} snapshots, keeping all"
+            continue
+        fi
+
+        local to_delete
+        to_delete=$(echo "$inst_snaps" | jq --argjson k "$KEEP" '.[$k:]')
+        local del_count
+        del_count=$(echo "$to_delete" | jq 'length')
+
+        echo "$to_delete" | jq -c '.[]' | while IFS= read -r snap; do
+            local sname
+            sname=$(echo "$snap" | jq -r '.name')
+
+            if [[ "$DRY_RUN" == "true" && "$FORCE" != "true" ]]; then
+                echo -e "  ${DIM}[DRY RUN]${RESET} would delete ${sname}"
+            else
+                if gcloud compute snapshots delete "$sname" \
+                    --project "$GCP_PROJECT" --quiet 2>/dev/null; then
+                    echo -e "  ${YELLOW}✓${RESET} deleted ${sname}"
+                    ((SNAP_DELETED++)) || true
+                else
+                    echo -e "  ${RED}✗${RESET} failed to delete ${sname}"
+                    ((SNAP_ERRORS++)) || true
+                fi
+            fi
+        done
+
+        log "${inst}: ${total} total, keeping ${KEEP}, removing ${del_count}"
+    done <<< "$instance_names"
+
+    echo ""
+    field_color "Deleted:" "${YELLOW}${SNAP_DELETED}${RESET}"
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          LIST
+# ══════════════════════════════════════════════════════════════════════
+do_list() {
+    section_header "All Snapshots"
+
+    local snaps
+    snaps=$(list_snapshots)
+    local count
+    count=$(echo "$snaps" | jq 'length')
+
+    if [[ "$count" -eq 0 ]]; then
+        log "No snapshots found"
+        return
+    fi
+
+    printf "  %-40s %-10s %-12s %-16s %s\n" \
+        "NAME" "SIZE_GB" "AGE" "SOURCE_DISK" "SOURCE_INSTANCE"
+    printf "  %s\n" "$(printf '%.0s─' {1..100})"
+
+    local now
+    now=$(date +%s)
+
+    echo "$snaps" | jq -c '.[]' | while IFS= read -r snap; do
+        local name size_gb created source_disk source_inst age_str
+        name=$(echo "$snap" | jq -r '.name')
+        size_gb=$(echo "$snap" | jq -r '.diskSizeGb // 0')
+        created=$(echo "$snap" | jq -r '.creationTimestamp // ""')
+        source_disk=$(echo "$snap" | jq -r '.sourceDisk // ""' | rev | cut -d/ -f1 | rev)
+        source_inst=$(echo "$snap" | jq -r '.labels["source-instance"] // "manual"')
+
+        if [[ -n "$created" ]]; then
+            local snap_epoch
+            snap_epoch=$(date -d "$created" +%s 2>/dev/null || echo 0)
+            if [[ "$snap_epoch" -gt 0 ]]; then
+                local age_days=$(( (now - snap_epoch) / 86400 ))
+                age_str="${age_days}d"
+            else
+                age_str="unknown"
+            fi
+        else
+            age_str="unknown"
+        fi
+
+        printf "  %-40s %-10s %-12s %-16s %s\n" \
+            "${name:0:39}" "$size_gb" "$age_str" "${source_disk:0:15}" "${source_inst:0:20}"
+    done
+
+    echo ""
+    field "Total snapshots:" "$count"
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          AUDIT
+# ══════════════════════════════════════════════════════════════════════
+do_audit() {
+    section_header "Snapshot Audit"
+
+    local instances_json
+    instances_json=$(get_all_instances)
+    local snaps
+    snaps=$(list_snapshots)
+    local now
+    now=$(date +%s)
+
+    printf "  %-24s %-14s %-24s %-8s %-8s %s\n" \
+        "INSTANCE" "ZONE" "LATEST_SNAPSHOT" "AGE" "COUNT" "STATUS"
+    printf "  %s\n" "$(printf '%.0s─' {1..100})"
+
+    echo "$instances_json" | jq -c '.[]' | while IFS= read -r inst; do
+        local name zone
+        name=$(echo "$inst" | jq -r '.name')
+        zone=$(get_instance_zone "$inst")
+
+        local inst_snaps snap_count
+        inst_snaps=$(echo "$snaps" | jq --arg inst "$name" \
+            '[.[] | select(.labels["source-instance"] == $inst)]')
+        snap_count=$(echo "$inst_snaps" | jq 'length')
+
+        if [[ "$snap_count" -eq 0 ]]; then
+            printf "  %-24s %-14s %-24s %-8s %-8s %b%s%b\n" \
+                "${name:0:23}" "${zone:0:13}" "(none)" "—" "0" \
+                "$RED" "✗ Unprotected" "$RESET"
+            continue
+        fi
+
+        local latest_name latest_date age_str status color
+        latest_name=$(echo "$inst_snaps" | jq -r 'sort_by(.creationTimestamp) | last | .name // ""')
+        latest_date=$(echo "$inst_snaps" | jq -r 'sort_by(.creationTimestamp) | last | .creationTimestamp // ""')
+
+        if [[ -n "$latest_date" ]]; then
+            local snap_epoch
+            snap_epoch=$(date -d "$latest_date" +%s 2>/dev/null || echo 0)
+            if [[ "$snap_epoch" -gt 0 ]]; then
+                local age_days=$(( (now - snap_epoch) / 86400 ))
+                age_str="${age_days}d"
+                if (( age_days > MAX_AGE )); then
+                    status="⚠ Stale"; color="$YELLOW"
+                else
+                    status="✓ OK"; color="$GREEN"
+                fi
+            else
+                age_str="unknown"; status="✓ OK"; color="$GREEN"
+            fi
+        else
+            age_str="unknown"; status="✓ OK"; color="$GREEN"
+        fi
+
+        printf "  %-24s %-14s %-24s %-8s %-8s %b%s%b\n" \
+            "${name:0:23}" "${zone:0:13}" "${latest_name:0:23}" \
+            "$age_str" "$snap_count" "$color" "$status" "$RESET"
+    done
+
+    echo ""
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          RESTORE
+# ══════════════════════════════════════════════════════════════════════
+do_restore() {
+    [[ -z "$INSTANCE_NAME" ]] && die "--restore requires --instance NAME"
+    [[ -z "$SNAPSHOT_NAME" ]] && die "--restore requires --snapshot-name NAME"
+    [[ -z "$ZONE" ]] && die "--restore requires --zone ZONE"
+
+    section_header "Restore from Snapshot"
+    field "Instance:" "$INSTANCE_NAME"
+    field "Snapshot:" "$SNAPSHOT_NAME"
+    field "Zone:" "$ZONE"
+    echo ""
+
+    if [[ "$FORCE" != "true" ]]; then
+        warn "This will stop the instance and replace its boot disk. Use --force to confirm."
+        return
+    fi
+
+    log "Creating disk from snapshot..."
+    local disk_name="restored-${INSTANCE_NAME}-$(date +%Y%m%d-%H%M%S)"
+
+    if gcloud compute disks create "$disk_name" \
+        --source-snapshot="$SNAPSHOT_NAME" \
+        --zone="$ZONE" \
+        --project "$GCP_PROJECT" \
+        --quiet 2>/dev/null; then
+        echo -e "  ${GREEN}✓${RESET} Disk created: ${disk_name}"
+    else
+        die "Failed to create disk from snapshot"
+    fi
+
+    log "Stopping instance..."
+    gcloud compute instances stop "$INSTANCE_NAME" \
+        --zone="$ZONE" --project "$GCP_PROJECT" --quiet 2>/dev/null \
+        || die "Failed to stop instance"
+
+    local old_disk
+    old_disk=$(get_boot_disk "$INSTANCE_NAME" "$ZONE")
+
+    log "Detaching old boot disk..."
+    gcloud compute instances detach-disk "$INSTANCE_NAME" \
+        --disk="$old_disk" --zone="$ZONE" --project "$GCP_PROJECT" \
+        --quiet 2>/dev/null || die "Failed to detach old disk"
+
+    log "Attaching restored disk..."
+    gcloud compute instances attach-disk "$INSTANCE_NAME" \
+        --disk="$disk_name" --zone="$ZONE" --boot \
+        --project "$GCP_PROJECT" --quiet 2>/dev/null \
+        || die "Failed to attach restored disk"
+
+    log "Starting instance..."
+    gcloud compute instances start "$INSTANCE_NAME" \
+        --zone="$ZONE" --project "$GCP_PROJECT" --quiet 2>/dev/null
+    echo -e "  ${GREEN}✓${RESET} Instance started with restored disk"
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          STATUS
+# ══════════════════════════════════════════════════════════════════════
+do_status() {
+    local instances_json
+    instances_json=$(get_all_instances)
+    local snaps
+    snaps=$(list_snapshots)
+    local now
+    now=$(date +%s)
+
+    local total_instances=0 total_snaps=0 total_gb=0
+    local protected=0 stale=0 unprotected=0
+
+    while IFS= read -r inst; do
+        [[ -z "$inst" ]] && continue
+        ((total_instances++)) || true
+
+        local name
+        name=$(echo "$inst" | jq -r '.name')
+
+        local inst_snaps snap_count
+        inst_snaps=$(echo "$snaps" | jq --arg inst "$name" \
+            '[.[] | select(.labels["source-instance"] == $inst)]')
+        snap_count=$(echo "$inst_snaps" | jq 'length')
+        total_snaps=$(( total_snaps + snap_count ))
+
+        local gb
+        gb=$(echo "$inst_snaps" | jq '[.[].diskSizeGb // 0 | tonumber] | add // 0')
+        total_gb=$(( total_gb + gb ))
+
+        if [[ "$snap_count" -eq 0 ]]; then
+            ((unprotected++)) || true
+            continue
+        fi
+
+        local latest_date
+        latest_date=$(echo "$inst_snaps" | jq -r \
+            'sort_by(.creationTimestamp) | last | .creationTimestamp // ""')
+
+        if [[ -n "$latest_date" ]]; then
+            local snap_epoch
+            snap_epoch=$(date -d "$latest_date" +%s 2>/dev/null || echo 0)
+            if [[ "$snap_epoch" -gt 0 ]]; then
+                local age_days=$(( (now - snap_epoch) / 86400 ))
+                if (( age_days > MAX_AGE )); then
+                    ((stale++)) || true
+                else
+                    ((protected++)) || true
+                fi
+            else
+                ((protected++)) || true
+            fi
+        else
+            ((protected++)) || true
+        fi
+    done < <(echo "$instances_json" | jq -c '.[]')
+
+    if [[ "$OUTPUT_FORMAT" == "prometheus" ]]; then
+        cat <<EOF
+# HELP gcp_snapshot_instances_total Total GCP Compute Engine instances
+# TYPE gcp_snapshot_instances_total gauge
+gcp_snapshot_instances_total ${total_instances}
+# HELP gcp_snapshot_total Total snapshots across all instances
+# TYPE gcp_snapshot_total gauge
+gcp_snapshot_total ${total_snaps}
+# HELP gcp_snapshot_storage_gb Total snapshot storage in GB
+# TYPE gcp_snapshot_storage_gb gauge
+gcp_snapshot_storage_gb ${total_gb}
+# HELP gcp_snapshot_protected_instances Instances with recent snapshots
+# TYPE gcp_snapshot_protected_instances gauge
+gcp_snapshot_protected_instances ${protected}
+# HELP gcp_snapshot_stale_instances Instances with snapshots older than threshold
+# TYPE gcp_snapshot_stale_instances gauge
+gcp_snapshot_stale_instances ${stale}
+# HELP gcp_snapshot_unprotected_instances Instances with no snapshots
+# TYPE gcp_snapshot_unprotected_instances gauge
+gcp_snapshot_unprotected_instances ${unprotected}
+# HELP gcp_snapshot_max_age_days Stale threshold in days
+# TYPE gcp_snapshot_max_age_days gauge
+gcp_snapshot_max_age_days ${MAX_AGE}
+# HELP gcp_snapshot_retention_count Retention count setting
+# TYPE gcp_snapshot_retention_count gauge
+gcp_snapshot_retention_count ${KEEP}
+EOF
+        return
+    fi
+
+    section_header "Fleet Snapshot Status"
+    field "Instances:" "$total_instances"
+    field "Total snapshots:" "$total_snaps"
+    field "Total storage:" "${total_gb} GB"
+    field_color "Protected:" "${GREEN}${protected}${RESET}"
+    if [[ "$stale" -gt 0 ]]; then
+        field_color "Stale (>${MAX_AGE}d):" "${YELLOW}${stale}${RESET}"
+    else
+        field_color "Stale (>${MAX_AGE}d):" "${GREEN}0${RESET}"
+    fi
+    if [[ "$unprotected" -gt 0 ]]; then
+        field_color "Unprotected:" "${RED}${unprotected}${RESET}"
+    else
+        field_color "Unprotected:" "${GREEN}0${RESET}"
+    fi
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          HELP
+# ══════════════════════════════════════════════════════════════════════
+show_help() {
+    cat <<EOF
+${BOLD}${SCRIPT_NAME}${RESET} — GCP Snapshot Manager
+
+Create, rotate, list, audit, and restore GCP persistent disk snapshots
+via gcloud CLI.
+
+${BOLD}MODES${RESET}
+  --snapshot          Create snapshots of instance boot disks
+  --rotate            Prune old managed snapshots
+  --list              List all snapshots
+  --audit             Check snapshot coverage and staleness
+  --restore           Restore an instance from a snapshot
+  --status            Fleet-wide snapshot summary
+
+${BOLD}TARGETING${RESET}
+  --instance NAME     Target a specific instance
+  --zone ZONE         Instance zone (required for some operations)
+  --all               Target all instances
+
+${BOLD}OPTIONS${RESET}
+  --keep N            Snapshots to retain per instance (default: 3)
+  --prefix STR        Managed snapshot name prefix (default: auto)
+  --max-age DAYS      Stale threshold for audit (default: 7)
+  --snapshot-name N   Snapshot name for restore
+  --format FMT        Output: text, prometheus (default: text)
+  --project PROJECT   GCP project ID
+  --dry-run           Preview deletions without executing (default)
+  --force             Execute deletions / skip confirmations
+  --verbose           Debug output
+  --no-color          Disable colored output
+  --help              Show this help message
+
+${BOLD}ENVIRONMENT VARIABLES${RESET}
+  GSM_KEEP             Default retention count
+  GSM_PREFIX           Default snapshot name prefix
+  GSM_MAX_AGE          Default stale threshold (days)
+  GSM_FORMAT           Default output format
+  VERBOSE              Enable verbose output (true/false)
+  COLOR                Color mode: auto, always, never
+
+${BOLD}EXAMPLES${RESET}
+  # Snapshot a single instance
+  ${SCRIPT_NAME} --snapshot --instance web-01 --zone us-central1-a
+
+  # Snapshot all instances
+  ${SCRIPT_NAME} --snapshot --all
+
+  # Snapshot and rotate in one run
+  ${SCRIPT_NAME} --snapshot --rotate --all --keep 3 --force
+
+  # Dry-run rotation
+  ${SCRIPT_NAME} --rotate --all --keep 3
+
+  # Execute rotation
+  ${SCRIPT_NAME} --rotate --all --keep 3 --force
+
+  # List all snapshots
+  ${SCRIPT_NAME} --list
+
+  # Audit fleet snapshot health
+  ${SCRIPT_NAME} --audit
+
+  # Restore an instance
+  ${SCRIPT_NAME} --restore --instance web-01 --zone us-central1-a --snapshot-name auto-web-01-20260411
+
+  # Prometheus metrics output
+  ${SCRIPT_NAME} --status --format prometheus
+
+${BOLD}EXIT CODES${RESET}
+  0   Success
+  1   Runtime error
+EOF
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          PARSE ARGS
+# ══════════════════════════════════════════════════════════════════════
+parse_args() {
+    while [[ $# -gt 0 ]]; do
+        case "$1" in
+            --snapshot)       RUN_MODE="snapshot"; shift ;;
+            --rotate)
+                if [[ "$RUN_MODE" == "snapshot" ]]; then
+                    ALSO_ROTATE="true"
+                else
+                    RUN_MODE="rotate"
+                fi
+                shift ;;
+            --list)           RUN_MODE="list"; shift ;;
+            --audit)          RUN_MODE="audit"; shift ;;
+            --restore)        RUN_MODE="restore"; shift ;;
+            --status)         RUN_MODE="status"; shift ;;
+            --instance)       INSTANCE_NAME="${2:?--instance requires a name}"; shift 2 ;;
+            --zone)           ZONE="${2:?--zone requires a value}"; shift 2 ;;
+            --all)            TARGET_ALL="true"; shift ;;
+            --keep)           KEEP="${2:?--keep requires a number}"; shift 2 ;;
+            --prefix)         PREFIX="${2:?--prefix requires a string}"; shift 2 ;;
+            --max-age)        MAX_AGE="${2:?--max-age requires days}"; shift 2 ;;
+            --snapshot-name)  SNAPSHOT_NAME="${2:?--snapshot-name requires a value}"; shift 2 ;;
+            --format)         OUTPUT_FORMAT="${2:?--format requires a value}"; shift 2 ;;
+            --project)        GCP_PROJECT="${2:?--project requires a value}"; shift 2 ;;
+            --dry-run)        DRY_RUN="true"; shift ;;
+            --force)          FORCE="true"; shift ;;
+            --verbose)        VERBOSE="true"; shift ;;
+            --no-color)       COLOR="never"; shift ;;
+            --help|-h)        setup_colors; show_help; exit 0 ;;
+            *)                die "Unknown option: $1 (see --help)" ;;
+        esac
+    done
+}
+
+# ══════════════════════════════════════════════════════════════════════
+#                          MAIN
+# ══════════════════════════════════════════════════════════════════════
+main() {
+    parse_args "$@"
+    setup_colors
+
+    if [[ -z "$RUN_MODE" ]]; then
+        err "No mode specified"
+        echo ""
+        show_help
+        exit 1
+    fi
+
+    check_deps
+    check_credentials
+
+    START_TIME=$(date +%s)
+
+    case "$RUN_MODE" in
+        snapshot) do_snapshot ;;
+        rotate)   do_rotate ;;
+        list)     do_list ;;
+        audit)    do_audit ;;
+        restore)  do_restore ;;
+        status)   do_status ;;
+        *)        die "Unknown mode: ${RUN_MODE}" ;;
+    esac
+
+    if [[ "$OUTPUT_FORMAT" != "prometheus" ]]; then
+        echo ""
+        field "Duration:" "$(elapsed)"
+    fi
+}
+
+main "$@"