#!/usr/bin/env bash
# jetstack/cert-manager v1.21.1 - base variant: crds-enabled
# Path: fetch this entry's retained objects, check their SHA-256, then apply
# them with kubectl. It uses curl, shasum, awk and kubectl. It needs no cub
# CLI and no ConfigHub account.
# Generated by scripts/generate-public-site.mjs from this entry's listing:
# https://confighub.github.io/helm-expt/site/listings/jetstack-cert-manager-v1-21-1-crds-enabled.json
# Entry page: https://confighub.github.io/helm-expt/site/charts/jetstack-cert-manager-v1-21-1.html
set -euo pipefail

say() { printf '\n>> %s\n' "$*"; }

for tool in curl awk kubectl; do
  if ! command -v "$tool" >/dev/null 2>&1; then
    printf '%s is required and was not found.\n' "$tool" >&2
    exit 1
  fi
done
if command -v shasum >/dev/null 2>&1; then
  sha256_of() { shasum -a 256 "$1" | awk '{print $1}'; }
elif command -v sha256sum >/dev/null 2>&1; then
  sha256_of() { sha256sum "$1" | awk '{print $1}'; }
else
  printf 'shasum is required and was not found.\n' >&2
  exit 1
fi

work=./jetstack-cert-manager-v1-21-1-crds-enabled-objects
objects_url=https://raw.githubusercontent.com/confighub/helm-expt/main/recipes/jetstack/cert-manager/v1.21.1/revisions/crds-enabled/r001/rendered/release-objects.yaml
objects_sha256=b086f94f9123688449e03f4a7af2071f8f97ad4ccafa226c375fc2bb44a6c2db

say "Fetch the retained objects into $work/objects.yaml"
mkdir -p "$work"
curl -fsSL -o "$work/objects.yaml" "$objects_url"

say "Check the file against the SHA-256 in the listing"
fetched_sha256="$(sha256_of "$work/objects.yaml")"
if [ "$fetched_sha256" != "$objects_sha256" ]; then
  printf 'The file differs from the listing, so the script stops. Nothing was applied.\n  listing: %s\n  fetched: %s\n' "$objects_sha256" "$fetched_sha256" >&2
  exit 1
fi
printf 'The file matches: sha256 %s\n' "$fetched_sha256"

say "Split the file into its 46 objects. The cluster is untouched so far"
rm -rf "$work/docs" "$work/crds" "$work/rest"
mkdir -p "$work/docs" "$work/crds" "$work/rest"
awk -v dir="$work/docs" 'BEGIN { n = 0; f = sprintf("%s/doc-%04d.yaml", dir, n) } /^---[ \t]*$/ { close(f); n++; f = sprintf("%s/doc-%04d.yaml", dir, n); next } { print > f }' "$work/objects.yaml"
for n in 0004 0005 0006 0007 0008 0009; do mv "$work/docs/doc-$n.yaml" "$work/crds/"; done
for n in 0001 0002 0003 0010 0011 0012 0013 0014 0015 0016 0017 0018; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
for n in 0019 0020 0021 0022 0023 0024 0025 0026 0027 0028 0029 0030; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
for n in 0031 0032 0033 0034 0035 0036 0037 0038 0039 0040 0041 0042; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
for n in 0043 0044 0045 0046; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
ls "$work/crds" "$work/rest"

say "Check that kubectl reaches a cluster"
if ! kubectl get --raw /version >/dev/null 2>&1; then
  printf 'kubectl cannot reach a cluster. Point it at a throwaway cluster and re-run this script.\n' >&2
  exit 1
fi
kubectl config current-context 2>/dev/null || true

say "Create the cert-manager namespace if it does not exist"
if ! kubectl get namespace cert-manager >/dev/null 2>&1; then
  kubectl create namespace cert-manager
fi

say "Create the kube-system namespace if it does not exist"
if ! kubectl get namespace kube-system >/dev/null 2>&1; then
  kubectl create namespace kube-system
fi

wait_for_crd() {
  crd_name="$1"
  deadline=$(( $(date +%s) + 180 ))
  until kubectl get "crd/${crd_name}" >/dev/null 2>&1; do
    if [ "$(date +%s)" -ge "$deadline" ]; then
      printf "CRD %s did not appear within 180 seconds.\n" "$crd_name" >&2
      return 1
    fi
    sleep 2
  done
  kubectl wait --for=condition=Established --timeout=120s "crd/${crd_name}"
}

say "Check the 6 CRDs this file holds"
missing_crds=0
if ! kubectl get crd/challenges.acme.cert-manager.io >/dev/null 2>&1; then
  missing_crds=1
fi
if ! kubectl get crd/orders.acme.cert-manager.io >/dev/null 2>&1; then
  missing_crds=1
fi
if ! kubectl get crd/certificaterequests.cert-manager.io >/dev/null 2>&1; then
  missing_crds=1
fi
if ! kubectl get crd/certificates.cert-manager.io >/dev/null 2>&1; then
  missing_crds=1
fi
if ! kubectl get crd/clusterissuers.cert-manager.io >/dev/null 2>&1; then
  missing_crds=1
fi
if ! kubectl get crd/issuers.cert-manager.io >/dev/null 2>&1; then
  missing_crds=1
fi
if [ "$missing_crds" -eq 1 ]; then
  say "A CRD is missing, so apply the file's CRDs first"
  kubectl apply --server-side -f "$work/crds"
  crd_outcome="were applied first"
elif kubectl diff --server-side -f "$work/crds" >/dev/null 2>&1; then
  say "The CRDs already exist and match this file. The script leaves them under their current owner"
  crd_outcome="already existed and matched, so the script left them alone"
elif [ "${APPLY_CRDS:-0}" = "1" ]; then
  say "The existing CRDs differ from this file. APPLY_CRDS=1 is set, so the script applies the file's CRDs"
  kubectl apply --server-side -f "$work/crds"
  crd_outcome="differed and were applied, because APPLY_CRDS=1 was set"
else
  say "The CRDs already exist and differ from this file, or another tool owns them"
  cat <<'EOF_CRDS'
This script does not change CRDs it did not just create.
If this is an upgrade, the objects that follow may need the newer CRDs.
To let this script apply the file's CRDs, re-run with:
  APPLY_CRDS=1 bash try-objects.sh
EOF_CRDS
  exit 1
fi
wait_for_crd challenges.acme.cert-manager.io
wait_for_crd orders.acme.cert-manager.io
wait_for_crd certificaterequests.cert-manager.io
wait_for_crd certificates.cert-manager.io
wait_for_crd clusterissuers.cert-manager.io
wait_for_crd issuers.cert-manager.io

say "Apply the other 40 objects"
kubectl apply -f "$work/rest"

say "Done. The 6 CRDs $crd_outcome. kubectl applied the other 40 objects of this entry's retained file."
say "The script stops here. It did not wait for any workload to start"
say "Not run by this script: 1 step of this entry's plan. The entry page says who runs it."
cat <<'EOF_NOT_RUN'
   - Prune protection for the six keep-annotated CRDs. The six cert-manager CRDs render into this base and each carries helm.sh/resource-policy keep.
EOF_NOT_RUN