# lib/config - Configuration file manipulation functions
# These functions have no external dependencies and the following side-effects:
#
# CONFIG_AWK_CMD is defined, default is ``awk``
# Meta-config files contain multiple INI-style configuration files
# using a specific new section header to delimit them:
# [[group-name|file-name]]
# group-name refers to the group of configuration file changes to be processed
# at a particular time. These are called phases in ``stack.sh`` but
# group here as these functions are not DevStack-specific.
# file-name is the destination of the config file
# Save trace setting
C_XTRACE=$(set +o | grep xtrace)
set +o xtrace
# Allow the awk command to be overridden on legacy platforms
CONFIG_AWK_CMD=${CONFIG_AWK_CMD:-awk}
# Get the section for the specific group and config file
# get_meta_section infile group configfile
function get_meta_section {
local file=1ドル
local matchgroup=2ドル
local configfile=3ドル
[[ -r $file ]] || return 0
[[ -z $configfile ]] && return 0
$CONFIG_AWK_CMD -v matchgroup=$matchgroup -v configfile=$configfile '
BEGIN { group = "" }
/^\[\[.+\|.*\]\]/ {
if (group == "") {
gsub("[][]", "", 1ドル);
split(1,ドル a, "|");
if (a[1] == matchgroup && a[2] == configfile) {
group=a[1]
}
} else {
group=""
next
{
if (group != "")
print 0ドル
' $file
# Get a list of config files for a specific group
# get_meta_section_files infile group
function get_meta_section_files {
$CONFIG_AWK_CMD -v matchgroup=$matchgroup '
if (a[1] == matchgroup)
print a[2]
# Merge the contents of a meta-config file into its destination config file
# If configfile does not exist it will be created.
# merge_config_file infile group configfile
function merge_config_file {
# note in the awk below, \x27 is ascii for ' -- this avoids
# having to do nasty quoting games
get_meta_section $file $matchgroup $configfile | \
$CONFIG_AWK_CMD -v configfile=$configfile '
BEGIN {
section = ""
last_section = ""
section_count = 0
/^\[.+\]/ {
section=1ドル
/^ *\#/ {
/^[^ \t]+/ {
# get offset of first '=' in 0ドル
eq_idx = index(0,ドル "=")
# extract attr & value from 0ドル
attr = substr(0,ドル 1, eq_idx - 1)
value = substr(0,ドル eq_idx + 1)
# only need to strip trailing whitespace from attr
sub(/[ \t]*$/, "", attr)
# need to strip leading & trailing whitespace from value
sub(/^[ \t]*/, "", value)
sub(/[ \t]*$/, "", value)
# cfg_attr_count: number of config lines per [section, attr]
# cfg_attr: three dimensional array to keep all the config lines per [section, attr]
# cfg_section: keep the section names in the same order as they appear in local.conf
# cfg_sec_attr_name: keep the attr names in the same order as they appear in local.conf
if (! (section, attr) in cfg_attr_count) {
if (section != last_section) {
cfg_section[section_count++] = section
last_section = section
attr_count = cfg_sec_attr_count[section_count - 1]++
cfg_sec_attr_name[section_count - 1, attr_count] = attr
cfg_attr[section, attr, 0] = value
cfg_attr_count[section, attr] = 1
lno = cfg_attr_count[section, attr]++
cfg_attr[section, attr, lno] = value
END {
# Process each section in order
for (sno = 0; sno < section_count; sno++) {
section = cfg_section[sno]
# The ini routines simply append a config item immediately
# after the section header. To keep the same order as defined
# in local.conf, invoke the ini routines in the reverse order
for (attr_no = cfg_sec_attr_count[sno] - 1; attr_no >=0; attr_no--) {
attr = cfg_sec_attr_name[sno, attr_no]
if (cfg_attr_count[section, attr] == 1)
print "iniset " configfile " " section " " attr " \x27" cfg_attr[section, attr, 0] "\x27"
else {
# For multiline, invoke the ini routines in the reverse order
count = cfg_attr_count[section, attr]
print "iniset " configfile " " section " " attr " \x27" cfg_attr[section, attr, count - 1] "\x27"
for (l = count -2; l >= 0; l--)
print "iniadd_literal " configfile " " section " " attr " \x27" cfg_attr[section, attr, l] "\x27"
' | while read a; do eval "$a"; done
# Merge all of the files specified by group
# merge_config_group infile group [group ...]
function merge_config_group {
local localfile=1ドル; shift
local matchgroups=$@
[[ -r $localfile ]] || return 0
local configfile group
for group in $matchgroups; do
for configfile in $(get_meta_section_files $localfile $group); do
if [[ -d $(dirname $(eval "echo $configfile")) ]]; then
merge_config_file $localfile $group $configfile
fi
done
# Restore xtrace
$C_XTRACE
# Local variables:
# mode: shell-script
# End:
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