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#!/bin/sh -e
. /usr/share/debconf/confmodule
set -f # disable pathname expansion
db_capb escape # to support carriage return / multi-line values
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"
python -c '
import sys, yaml
def update(src, cand):
if not (isinstance(src, dict) and isinstance(cand, dict)):
return cand
for k, v in cand.iteritems():
# 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.load(newyaml)
with open(fname, "r") as fp:
cfg = yaml.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))' "$@"
}
handle_preseed_maas() {
local cfg_file="/etc/cloud/cloud.cfg.d/90_dpkg_maas.cfg"
local md_url="" creds_all="" c_key="" t_key="" t_sec="" c_sec="";
db_get "cloud-init/maas-metadata-url" && md_url="$RET" || :
db_get "cloud-init/maas-metadata-credentials" && creds_all="$RET" || :
# nothing to do
[ -n "$md_url" -o -n "$creds_all" ] || return 0
# change a url query string format into : delimited
if [ -n "$creds_all" -a "${creds_all#*&}" != "${creds_all}" ]; then
creds_all=$(python -c 'from urlparse import parse_qs; import sys;
keys = parse_qs(sys.argv[1])
for k in sys.argv[2:]:
sys.stdout.write("%s:" % keys.get(k,[""])[0])' "$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
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" = "_" -a "${c_key}:${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 debian package per preseed entries
# cloud-init/{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
# now clear the database of the values, as they've been consumed
db_unregister "cloud-init/maas-metadata-url" || :
db_unregister "cloud-init/maas-metadata-credentials" || :
}
handle_preseed_local_cloud_config() {
local ccfg="" debconf_name="cloud-init/local-cloud-config"
local cfg_file="/etc/cloud/cloud.cfg.d/90_dpkg_local_cloud_config.cfg"
local header="# written by cloud-init debian package per preseed entry
# $debconf_name"
db_get "${debconf_name}" && ccfg="$RET" || :
if [ "$ccfg" = "_" ]; then
rm -f "$cfg_file"
elif [ -n "$ccfg" ]; then
{ echo "$header"; echo "$ccfg"; } > "$cfg_file"
fi
db_unregister "${debconf_name}" || :
}
if [ "$1" = "configure" ] && [ -z "$2" ]; then
# 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
#DEBHELPER#
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