* Provides net_add_parse_vars function to install net_parse_vars hook when an interface comes online
* Provides net_parse_vars function to search and replace network related variables in a string
---
modules.d/40network/net-lib.sh | 56 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
index f9b461b..f006874 100644
--- a/modules.d/40network/net-lib.sh
+++ b/modules.d/40network/net-lib.sh
@@ -366,3 +366,59 @@ linkup() {
&& wait_for_if_up $1 2>/dev/null
}
+# net_parse_vars STRING IFUP
+# parse vars in STRING
+# IFUP may contain the interface that came online, triggering this hook
+net_parse_vars() {
+ local cur="$1" ifup="$2" var val iface
+
+ var="${cur#*%\{}"
+ var="${var%%\}*}"
+
+ while [ "${var}" != "${cur}" ] ; do
+ case "${var}" in
+ mac.*)
+ iface="${var##mac.}"
+ [ "${ifup}" = "${iface}" ] || exit
+ val="$(ip link show dev "${iface}" | sed -nre '/ether/s/^.*ether ([0-9a-f:]*) .*$/\1/' -e 's/://')"
+ ;;
+ hostname)
+ val="$(hostname)"
+ [ "${val}" = '(none)' ] && die 'No hostname (yet)'
+ ;;
+ *)
+ die "Unsupported cmdline variable '${var}'"
+ ;;
+ esac
+
+ cur="$(echo "${cur}" | sed "s/%{${var}}/${val}/")"
+ unset val
+
+ var="${cur#*%\{}"
+ var="${var%%\}*}"
+ done
+
+ echo "${cur}"
+}
+
+# net_add_parse_vars STRING LIB FUNCTION
+# add initqueue/online hook to parse vars in STRING
+# execute FUNCTION from LIB afterwards
+net_add_parse_vars() {
+ local string="$1" lib="$2" func="$3" jobid="$(cat /proc/sys/kernel/random/uuid)"
+
+ cat <<- EOF > "${hookdir}"/initqueue/online/40network.parse."${jobid}".sh
+ . /lib/"${lib}".sh
+
+ string="\$(net_parse_vars "${string}" "\$@")"
+ ${func} "\${string}"
+ unset string
+
+ > /tmp/40network.parse.finished."${jobid}"
+ EOF
+
+ cat <<- EOF > "${hookdir}"/initqueue/finished/40network.parse.wait."${jobid}".sh
+ echo "Waiting for nfs_parse_vars (${jobid}) to complete ..."
+ [ -f /tmp/40network.parse.finished."${jobid}" ]
+ EOF
+}
--
1.8.2.1
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