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List:       openembedded-core
Subject:    [OE-core] [PATCH] image.bbclass: add function to disable SSH DNS Lookup for Qemu
From:       sgw () linux ! intel ! com (Saul Wold)
Date:       2014-03-31 17:37:38
Message-ID: 1396287458-12576-1-git-send-email-sgw () linux ! intel ! com
[Download RAW message or body]

This function disables the reverse DNS lookup on QEMU targets to reduce the
delay when using static IP address. By disabling DNS lookup we can save a great
deal of time during automated testing on the autobuilder (on the order of ~400
seconds per ssh tranaction). This is seen when using the testimage, there is a
delay getting logged-in from the server to target.

It's enabled for all qemu imgaes by default and can be overridden by setting
the SSH_DISABLE_DNS_LOOKUP variable.

[YOCTO #5954]

Signed-off-by: Saul Wold <sgw at linux.intel.com>
---
 meta/classes/image.bbclass | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 29309f5..ea035fe 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -304,6 +304,16 @@ ssh_allow_empty_password () {
 	fi
 }
 
+# Disable DNS lookups, the SSH_DISABLE_DNS_LOOKUP can be overridden to allow
+# distros to choose not to take this change
+SSH_DISABLE_DNS_LOOKUP ?= " ssh_disable_dns_lookup ; "
+ROOTFS_POSTPROCESS_COMMAND_append_qemuall = "${SSH_DISABLE_DNS_LOOKUP}"
+ssh_disable_dns_lookup () {
+	if [ -e ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config ]; then
+		sed -i -e 's:#UseDNS yes:UseDNS no:' ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config
+	fi
+}
+
 # Enable postinst logging if debug-tweaks is enabled
 postinst_enable_logging () {
 	mkdir -p ${IMAGE_ROOTFS}${sysconfdir}/default
-- 
1.8.3.1


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