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Filename : cloud-init-base.postinst
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#!/bin/sh

set -e

# shellcheck source=/dev/null
. /usr/share/debconf/confmodule

set -f # disable pathname expansion
db_capb escape # to support carriage return / multi-line values

debug() {
   [ "${_CI_UPGRADE_DEBUG:-0}" = "0" ] && return 0
   echo "$@" 1>&2 || :
}

update_cfg() {
   # takes filename, header, new object (in yaml), optionally 'remover'
   # and merges new into existing object in filename, and then updates file
   # remover a string that means "delete existing entry"
   python3 -c '
import sys, yaml

def update(src, cand):
    if not (isinstance(src, dict) and isinstance(cand, dict)):
        return cand
    for k, v in cand.items():
        # if the candidate has _ as value, delete source
        if v == REMOVER:
            if k in src:
                del src[k]
            continue
        if k not in src:
            src[k] = v
        else:
            src[k] = update(src[k], v)
    return src

(fname, header, newyaml) = sys.argv[1:4]
REMOVER = object
if len(sys.argv) == 5:
   REMOVER = sys.argv[4]
newcfg = yaml.safe_load(newyaml)

with open(fname, "r") as fp:
    cfg = yaml.safe_load(fp)
if not cfg: cfg = {}

cfg = update(cfg, newcfg)

with open(fname, "w") as fp:
    fp.write(header + "\n")
    fp.write(yaml.dump(cfg))' "$@"
}

# MAAS 3.6 no longer provides debconf settings, but instead uses curtin to
# write /etc/cloud/cloud.cfg,d/95-cloudconfig-* files directly. When 3.6 is out
# of support, cloud-init-base can drop support for handling any debconf values.
handle_preseed_maas() {
   local cfg_file="/etc/cloud/cloud.cfg.d/90_dpkg_maas.cfg"
   local md_url="" creds_all="" c_key="" t_key="" t_sec="";

   if process_debconf_setting maas-metadata-url; then
       md_url="$RET"
   fi
   if process_debconf_setting maas-metadata-credentials; then
       creds_all="$RET"
   fi

   # nothing to do
   [ -n "$md_url" ] || [ -n "$creds_all" ] || return 0

   # change a url query string format into : delimited
   if [ -n "$creds_all" ] && [ "${creds_all#*&}" != "${creds_all}" ]; then
      # the command here ends up looking like:
      # python3 -c '...' 'oauth_consumer_key=v1&oauth_token_key=v2...' \
      #   oauth_consumer_key oauth_token_key oauth_token_secret
      creds_all=$(python3 -c 'from six.moves.urllib.parse import parse_qs;
import sys;
keys = parse_qs(sys.argv[1])
for k in sys.argv[2:]:
   sys.stdout.write("%s:" % keys.get(k,[""])[0])' "$creds_all" \
   oauth_consumer_key oauth_token_key oauth_token_secret
)
   fi

   # now, if non-empty creds_all is: consumer_key:token_key:token_secret
   # shellcheck disable=SC2086
   if [ -n "$creds_all" ]; then
      OIFS="$IFS"; IFS=:; set -- $creds_all; IFS="$OIFS"
      c_key=$1; t_key=$2; t_sec=$3
   fi

   if [ "$md_url" = "_" ] && [ "${c_key}:${t_key}:${t_sec}" = "_:_:_" ]; then
      # if all these values were '_', the delete value, just delete the file.
      rm -f "$cfg_file"
   else
      local header="# written by cloud-init-base debian package per preseed entries
# cloud-init-base/{maas-metadata-url,/maas-metadata-credentials}"

      local pair="" k="" v="" pload="" orig_umask=""
      for pair in "metadata_url:$md_url" "consumer_key:${c_key}" \
         "token_key:${t_key}" "token_secret:$t_sec"; do
         k=${pair%%:*}
         v=${pair#"${k}":}
         [ -n "$v" ] && pload="${pload} $k: \"$v\","
      done

      # '_' would indicate "delete", otherwise, existing entries are left
      orig_umask=$(umask)
      umask 066
      : >> "$cfg_file" && chmod 600 "$cfg_file"
      update_cfg "$cfg_file" "$header" "datasource: { MAAS: { ${pload%,} } }" _
      umask "${orig_umask}"
   fi
}

handle_preseed_local_cloud_config() {
   local ccfg=""
   local cfg_file="/etc/cloud/cloud.cfg.d/90_dpkg_local_cloud_config.cfg"
   local header="# written by cloud-init-base debian package per preseed entry
# cloud-init-base/local-cloud-config"

   if process_debconf_setting local-cloud-config; then
      ccfg="$RET"
   fi

   if [ "$ccfg" = "_" ]; then
      rm -f "$cfg_file"
   elif [ -n "$ccfg" ]; then
      { echo "$header"; echo "$ccfg"; } > "$cfg_file"
   fi
}

# This handles the upgrade path from cloud-init to cloud-init-base.
# 24.04 is the last LTS series to be released with cloud-init, so this code
# can be removed in 26.10, to ensure the upgrade path from 24.04->26.04 is
# not broken. 
process_debconf_setting() {
    local old="cloud-init/$1" new="cloud-init-base/$1" old_val="" new_val=""
    if db_get "$old" && [ -n "${RET}" ]; then
       old_val="$RET"
    fi
    if db_get "$new" && [ -n "${RET}" ]; then
       new_val="$RET"
    fi
    if [ -n "$new_val" ]; then
        echo "Encountered debconf setting for $new."
        if [ -n "$old_val" ]; then
            echo "Ignoring debconf $old setting due to $new."
            db_set "$old" "" || :
        fi
        # now clear the database of the values, as they've been consumed
        db_unregister "$new" || :
        RET="$new_val"
        return 0
    fi
    if [ -n "$old_val" ]; then
        echo "Encountered debconf setting for $old."
        # We set empty string as cloud-init-base can't db_unregister cloud-init
        # debconf settings. Instead, set this value empty which is ignored.
        db_set "$old" "" || :
        RET="$old_val"
        return 0
    fi
    return 1
}

if [ "$1" = "configure" ]; then
   if process_debconf_setting datasources; then
      datasources="$RET"
   fi
   if [ -n "$datasources" ]; then
      cat > /etc/cloud/cloud.cfg.d/90_dpkg.cfg <<EOF
# to update this file, run dpkg-reconfigure cloud-init-base
datasource_list: [ $datasources ]
EOF
   fi

   # if there are maas settings pre-seeded apply them
   handle_preseed_maas

   # if there is generic cloud-config preseed, apply them
   handle_preseed_local_cloud_config
fi


# Automatically added by dh_python3
if command -v py3compile >/dev/null 2>&1; then
	py3compile -p cloud-init-base  || true
fi
if command -v pypy3compile >/dev/null 2>&1; then
	pypy3compile -p cloud-init-base  || true
fi

# End automatically added section
# Automatically added by dh_installdeb/13.31ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init/cloud-config.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/cloud-final.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/cloud-init-blocknet.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/cloud-init-container.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/cloud-init-local.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/cloud-init-nonet.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/cloud-init.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/init/cloud-log-shutdown.conf 0.7.9-243-ge74d775-0ubuntu2\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/NetworkManager/dispatcher.d/hook-network-manager 23.3\~4ga31370af-0ubuntu1\~ -- "$@"
dpkg-maintscript-helper rm_conffile /etc/cloud/clean.d/README 24.1\~4\~ -- "$@"
# End automatically added section
# Automatically added by dh_installsystemd/13.31ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# The following line should be removed in trixie or trixie+1
	deb-systemd-helper unmask 'cloud-config.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'cloud-config.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'cloud-config.service' >/dev/null || true
	else
		# Update the statefile to add new symlinks (if any), which need to be
		# cleaned up on purge. Also remove old symlinks.
		deb-systemd-helper update-state 'cloud-config.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.31ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# The following line should be removed in trixie or trixie+1
	deb-systemd-helper unmask 'cloud-final.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'cloud-final.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'cloud-final.service' >/dev/null || true
	else
		# Update the statefile to add new symlinks (if any), which need to be
		# cleaned up on purge. Also remove old symlinks.
		deb-systemd-helper update-state 'cloud-final.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.31ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# The following line should be removed in trixie or trixie+1
	deb-systemd-helper unmask 'cloud-init-hotplugd.socket' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'cloud-init-hotplugd.socket'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'cloud-init-hotplugd.socket' >/dev/null || true
	else
		# Update the statefile to add new symlinks (if any), which need to be
		# cleaned up on purge. Also remove old symlinks.
		deb-systemd-helper update-state 'cloud-init-hotplugd.socket' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.31ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# The following line should be removed in trixie or trixie+1
	deb-systemd-helper unmask 'cloud-init-local.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'cloud-init-local.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'cloud-init-local.service' >/dev/null || true
	else
		# Update the statefile to add new symlinks (if any), which need to be
		# cleaned up on purge. Also remove old symlinks.
		deb-systemd-helper update-state 'cloud-init-local.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.31ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# The following line should be removed in trixie or trixie+1
	deb-systemd-helper unmask 'cloud-init-main.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'cloud-init-main.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'cloud-init-main.service' >/dev/null || true
	else
		# Update the statefile to add new symlinks (if any), which need to be
		# cleaned up on purge. Also remove old symlinks.
		deb-systemd-helper update-state 'cloud-init-main.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installsystemd/13.31ubuntu1
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
	# The following line should be removed in trixie or trixie+1
	deb-systemd-helper unmask 'cloud-init-network.service' >/dev/null || true

	# was-enabled defaults to true, so new installations run enable.
	if deb-systemd-helper --quiet was-enabled 'cloud-init-network.service'; then
		# Enables the unit on first installation, creates new
		# symlinks on upgrades if the unit file has changed.
		deb-systemd-helper enable 'cloud-init-network.service' >/dev/null || true
	else
		# Update the statefile to add new symlinks (if any), which need to be
		# cleaned up on purge. Also remove old symlinks.
		deb-systemd-helper update-state 'cloud-init-network.service' >/dev/null || true
	fi
fi
# End automatically added section