certbot/tools/snap/generate_dnsplugins_postrefreshhook.sh

#!/bin/bash
# Generate the hooks/post-refresh file for a DNS plugin
# Usage: bash generate_dnsplugins_postrefreshhook.sh path/to/dns/plugin
# For example, from the certbot home directory:
#   tools/snap/generate_dnsplugins_postrefreshhook.sh certbot-dns-dnsimple
set -eu

PLUGIN_PATH=$1
mkdir -p "${PLUGIN_PATH}/snap/hooks"
cat <<EOF > "${PLUGIN_PATH}/snap/hooks/post-refresh"
#!/bin/sh -e
# This file is generated by tools/generate_dnsplugins_postrefreshhook.sh and should not be edited manually.

# get certbot version
if [ ! -f "\$SNAP/certbot-shared/certbot-version.txt" ]; then
  echo "No certbot version available; not doing version comparison check" >> "\$SNAP_DATA/debuglog"
  exit 0
fi
cb_installed=\$(cat \$SNAP/certbot-shared/certbot-version.txt)

# get required certbot version for plugin. certbot version must be at least the plugin's
# version. note that this is not the required version in setup.py, but the version number itself.
cb_required=\$(grep -oP "version = '\K.*(?=')" \$SNAP/setup.py)


\$SNAP/bin/python3 -c "import sys; from packaging import version; sys.exit(1) if\
  version.parse('\$cb_installed') < version.parse('\$cb_required') else sys.exit(0)" || exit_code=\$?
if [ "\$exit_code" -eq 1 ]; then
  echo "Certbot is version \$cb_installed but needs to be at least \$cb_required before" \\
    "this plugin can be updated; will try again on next refresh."
  exit 1
fi
EOF