[oe-commits] Saul Wold : image.bbclass: add function to disable SSH DNS Lookup for Qemu

[git at git.openembedded.org]

Module: openembedded-core.git
Branch: master
Commit: c93eeecb15c4acac9226a3394c93d7e99a809d6b
URL:    http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=c93eeecb15c4acac9226a3394c93d7e99a809d6b

Author: Saul Wold <sgw at linux.intel.com>
Date:   Mon Mar 31 10:37:38 2014 -0700

image.bbclass: add function to disable SSH DNS Lookup for Qemu

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>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>

---

 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