#!/usr/bin/env bash
#
# JbTecWiz Support Centre -- generated fix script
#
# Fault : "NO_PUBKEY" or "repository is not signed" -- package updates refuse to run
# Fix   : Import the key for the RHEL family
# Source: https://jbtecwiz.com/support/lnx-sec-repo-key
#
# Run as     : Root shell
# Expect     : 20 minutes
# Risk       : medium
# Reversible : yes
#
# WHEN THIS IS THE RIGHT FIX
#   dnf reports a failed GPG check.
#
# HOW TO UNDO IT
#   sudo rpm -e gpg-pubkey-<id> removes an imported key.
#
# Walks the fix one step at a time and asks before each. Steps with no
# command are yours to do -- it prints those and waits. DRYRUN=1 prints
# without executing; UNATTENDED=1 does not ask.
#
# --------------------------------------------------------------------
# NO WARRANTY - USE AT YOUR OWN RISK
#
# This script is provided by JbTecWiz as-is and with no warranty of any
# kind, express or implied. You run it entirely at your own risk.
#
# JbTecWiz accepts no liability for any loss or damage arising from its
# use, including but not limited to data loss, downtime, or configuration
# changes that turn out to be wrong for your system.
#
# You are responsible for reading this script before running it, for
# satisfying yourself that it suits the machine in front of you, and for
# having a working backup first. Some steps cannot be undone.
# --------------------------------------------------------------------

set -uo pipefail
DRYRUN="${DRYRUN:-0}"
UNATTENDED="${UNATTENDED:-0}"
failed=0

# - THIS SCRIPT WILL NOT RUN UNTIL YOU EDIT IT -
cat >&2 <<'EOF'

  This script needs editing before it can run.
  Replace each of these with a real value:
    example.com   (a placeholder domain)

  Then delete this block near the top of the script.

EOF
exit 2

if [ "$(id -u)" -ne 0 ]; then
  echo "  This fix is documented as needing root. Re-run with sudo." >&2
  exit 3
fi

rule() { printf "\n%s\n" "$(printf '-%.0s' $(seq 1 70))"; if [ $# -gt 0 ]; then echo "$1"; fi; }
prose() { echo "$1" | fold -s -w 74 | sed "s/^/  /"; }

# Returns 0 when the caller should run the command, 1 when it should not.
# A manual step always returns 1 -- there is nothing for the caller to run.
step() {  # step <n> <do> <why> <manual|cmd> [command lines...]
  local n="$1" dotext="$2" why="$3" mode="$4"; shift 4
  rule "  Step $n of 5"
  prose "$dotext"
  if [ -n "$why" ]; then echo; prose "$why"; fi
  if [ "$mode" = "manual" ]; then
    echo; echo "  -> Do this yourself, then press Enter to carry on."
    if [ "$UNATTENDED" = "0" ] && [ "$DRYRUN" = "0" ]; then read -r _; fi
    return 1
  fi
  echo; printf "    %s\n" "$@"; echo
  if [ "$DRYRUN" = "1" ]; then echo "  (dry run -- not executed)"; return 1; fi
  if [ "$UNATTENDED" = "0" ]; then
    read -r -p "  Run this step? [Y]es / [S]kip / [Q]uit " a
    case "$a" in
      [Qq]*) echo "  Stopped at your request."; exit 0 ;;
      [Ss]*) echo "  Skipped."; return 1 ;;
    esac
  fi
  return 0
}

rule
echo "  "NO_PUBKEY" or "repository is not signed" -- package updates refuse to run"
echo "  Import the key for the RHEL family"
echo
echo "  Risk: medium   Reversible   20 minutes"
echo
prose 'No warranty. Use at your own risk - JbTecWiz accepts no liability. Read it before you run it, and have a backup.'
rule
echo
if [ "$UNATTENDED" = "0" ] && [ "$DRYRUN" = "0" ]; then
  read -r -p "  Ready? [y/N] " go
  case "$go" in [Yy]*) ;; *) echo "  Nothing was changed."; exit 0;; esac
fi

if step 1 'See which repository and which key.' '' cmd 'sudo dnf repolist -v | grep -E '\''Repo-id|Repo-gpgkey'\''' 'grep -r gpgkey /etc/yum.repos.d/'; then
  sudo dnf repolist -v | grep -E 'Repo-id|Repo-gpgkey'
  grep -r gpgkey /etc/yum.repos.d/
  if [ $? -ne 0 ]; then
    failed=$((failed+1))
    echo "  Step 1 failed. The rest of the fix may depend on it." >&2
  fi
fi

if step 2 'Import the key from the vendor'\''s HTTPS location.' '' cmd 'sudo rpm --import https://download.example.com/RPM-GPG-KEY-example'; then
  sudo rpm --import https://download.example.com/RPM-GPG-KEY-example
  if [ $? -ne 0 ]; then
    failed=$((failed+1))
    echo "  Step 2 failed. The rest of the fix may depend on it." >&2
  fi
fi

if step 3 'Check the fingerprint against what the vendor publishes before trusting it.' '' cmd 'rpm -qa gpg-pubkey* --qf '\''%{summary} %{version}-%{release}\n'\'''; then
  rpm -qa gpg-pubkey* --qf '%{summary} %{version}-%{release}\n'
  if [ $? -ne 0 ]; then
    failed=$((failed+1))
    echo "  Step 3 failed. The rest of the fix may depend on it." >&2
  fi
fi

if step 4 'Clear the metadata cache, which can hold the failed state.' '' cmd 'sudo dnf clean all' 'sudo dnf makecache'; then
  sudo dnf clean all
  sudo dnf makecache
  if [ $? -ne 0 ]; then
    failed=$((failed+1))
    echo "  Step 4 failed. The rest of the fix may depend on it." >&2
  fi
fi

step 5 'Do not set gpgcheck=0 in the repository file. It removes the guarantee that the packages came from the vendor at all.' '' manual || true

rule "  Confirm it worked"
prose 'dnf check-update runs without a GPG error.'
if [ "$DRYRUN" = "0" ]; then
  sudo dnf check-update | head
fi

rule
if [ "$failed" -gt 0 ]; then
  echo "  Finished with $failed failed step(s)."
  echo "  Read the full write-up at https://jbtecwiz.com/support/lnx-sec-repo-key"
else
  echo "  Finished."
fi
echo
prose 'To undo: sudo rpm -e gpg-pubkey-<id> removes an imported key.'
rule