Refactor postinstall script so it has a separate script for connecting to the RAID

[invirt/packages/xvm-iscsi-config.git] / xvm-iscsi-connect

diff --git a/xvm-iscsi-connect b/xvm-iscsi-connect
new file mode 100755 (executable)
index 0000000..b0701d0
--- /dev/null
+++ b/xvm-iscsi-connect
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+set -e
+
+good_nodes=""
+
+for i in $(invirt-getconf --ls iscsi.targets); do
+    # Extract the portal to talk to
+    portal_ip=$(invirt-getconf iscsi.targets.$i.ip)
+
+    # Extract the interfaces we should talk to this portal
+    # on. Unfortunately, we have to ask about all the interfaces
+    # simultaneously, because iscsiadm deletes all existing mentions
+    # of a portal when you run discovery again.
+    ifaces=$(for j in $(invirt-getconf --ls iscsi.targets.$i.ifaces); do invirt-getconf iscsi.targets.$i.ifaces.$j; done)
+
+    echo "Connecting to $portal_ip via $ifaces"
+
+    # Use SendTargets to discover the available targets on the given portal.
+    iscsiadm -m discovery -t st -p $portal_ip:3260 $(for iface in $ifaces; do echo -I $iface; done)
+
+    # Because of protocol limitations (see
+    # http://www.pdl.cmu.edu/mailinglists/ips/mail/msg05174.html), the
+    # discovery attempt may have returned additional targets that are
+    # unreachable via this interface/portal. Make a list of discovered
+    # target, portal, interface combinations so we can later remove
+    # extraneous ones.
+    for iface in $ifaces; do
+       good_nodes="$good_nodes "$(echo /etc/iscsi/nodes/*/$portal_ip,3260,1/$iface)
+    done
+
+    # If the discovery attempt did not log into the target, explicitly do so now.
+    for iface in $ifaces; do
+       iscsiadm -m node -p $portal_ip:3260 -I $iface -l
+    done
+done
+
+# Find all the nodes we now know about that we weren't supposed to
+bad_nodes=$(find /etc/iscsi/nodes -type f | grep -Fxvf <(echo "$good_nodes" | sed 's/ /\n/g'))
+# and delete them.
+echo "Removing "$(echo $bad_nodes | wc -w)" extraneous discovered targets"
+for node in $bad_nodes; do
+    echo "Removing $node"
+
+    # Remove the node entry
+    rm $node;
+
+    # Remove the cached results of the discovery so iscsiadm doesn't
+    # get confused
+    find /etc/iscsi/send_targets -lname "${node%/*}" -delete
+done