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ctdb-scripts: Factor out possible creation of rt_tables file

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Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Jose A. Rivera <jarrpa@samba.org>
Reviewed-by: Michael Adam <obnox@samba.org>
This commit is contained in:
Martin Schwenke
2015-08-17 13:39:10 +10:00
committed by Michael Adam
parent 677467682a
commit c58d582ffb
1 changed files with 23 additions and 21 deletions
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44
ctdb/config/events.d/13.per_ip_routing
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@ -93,6 +93,19 @@ ipv4_host_addr_to_net ()
######################################################################
ensure_rt_tables ()
{
rt_tables="$CTDB_ETCDIR/iproute2/rt_tables"
# This file should always exist. Even if this didn't exist on the
# system, adding a route will have created it. What if we startup
# and immediately shutdown? Let's be sure.
if [ ! -f "$rt_tables" ] ; then
mkdir -p "${rt_tables%/*}" # dirname
touch "$rt_tables"
fi
}
# Setup a table id to use for the given IP. We don't need to know it,
# it just needs to exist in /etc/iproute2/rt_tables. Fail if no free
# table id could be found in the configured range.
@ -100,12 +113,7 @@ ensure_table_id_for_ip ()
{
_ip=$1
_f="$CTDB_ETCDIR/iproute2/rt_tables"
# This file should always exist, but...
if [ ! -f "$_f" ] ; then
mkdir -p $(dirname "$_f")
touch "$_f"
fi
ensure_rt_tables
# Maintain a table id for each IP address we've ever seen in
# rt_tables. We use a "ctdb." prefix on the label.
@ -117,7 +125,7 @@ ensure_table_id_for_ip ()
(
# Note that die() just gets us out of the subshell...
flock --timeout 30 0 || \
die "ensure_table_id_for_ip: failed to lock file $_f"
die "ensure_table_id_for_ip: failed to lock file $rt_tables"
_new=$CTDB_PER_IP_ROUTING_TABLE_ID_LOW
while read _t _l ; do
@ -140,44 +148,38 @@ ensure_table_id_for_ip ()
# If the new table id is legal then add it to the file and
# print it.
if [ $_new -le $CTDB_PER_IP_ROUTING_TABLE_ID_HIGH ] ; then
printf "%d\t%s\n" "$_new" "$_label" >>"$_f"
printf "%d\t%s\n" "$_new" "$_label" >>"$rt_tables"
return 0
else
return 1
fi
) <"$_f"
) <"$rt_tables"
}
# Clean up all the table ids that we might own.
clean_up_table_ids ()
{
_f="$CTDB_ETCDIR/iproute2/rt_tables"
# Even if this didn't exist on the system, adding a route will
# have created it. What if we startup and immediately shutdown?
if [ ! -f "$_f" ] ; then
mkdir -p $(dirname "$_f")
touch "$_f"
fi
ensure_rt_tables
(
# Note that die() just gets us out of the subshell...
flock --timeout 30 0 || \
die "clean_up_table_ids: failed to lock file $_f"
die "clean_up_table_ids: failed to lock file $rt_tables"
# Delete any items from the file that have a table id in our
# range or a label matching our label. Preserve comments.
_tmp="${_f}.$$.ctdb"
_tmp="${rt_tables}.$$.ctdb"
awk -v min="$CTDB_PER_IP_ROUTING_TABLE_ID_LOW" \
-v max="$CTDB_PER_IP_ROUTING_TABLE_ID_HIGH" \
-v pre="$table_id_prefix" \
'/^#/ || \
!(min <= $1 && $1 <= max) && \
!(index($2, pre) == 1) \
{ print $0 }' "$_f" >"$_tmp"
{ print $0 }' "$rt_tables" >"$_tmp"
mv "$_tmp" "$_f"
mv "$_tmp" "$rt_tables"
# The lock is gone - don't do anything else here
) <"$_f"
) <"$rt_tables"
}
######################################################################