From 094453f443ed592d814dfb4182a0a02f0a2552e4 Mon Sep 17 00:00:00 2001
From: Scott Garman <scott.a.garman@intel.com>
Date: Fri, 9 Sep 2011 02:59:27 -0700
Subject: runqemu: improve auto-detection of rootfs filenames

This refactors the way rootfs filenames are auto-detected when you
run the runqemu script without an explicit rootfs filename argument.
It allows the script to use rootfs files generated by hob, and when
there are mutliple rootfs files to choose from, it will pick the
most recently created one.

Fixes [YOCTO #1437].

Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
 scripts/runqemu | 35 +++++++++++++++--------------------
 1 file changed, 15 insertions(+), 20 deletions(-)

diff --git a/scripts/runqemu b/scripts/runqemu
index 364fa1cb14..0f943b5fec 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -239,31 +239,24 @@ machine2=`echo $MACHINE | tr 'a-z' 'A-Z' | sed 's/-/_/'`
 # Defaults used when these vars need to be inferred
 QEMUX86_DEFAULT_KERNEL=bzImage-qemux86.bin
 QEMUX86_DEFAULT_FSTYPE=ext3
-QEMUX86_DEFAULT_ROOTFS="core-image-sato-sdk core-image-sato core-image-lsb core-image-basic core-image-minimal"
 
 QEMUX86_64_DEFAULT_KERNEL=bzImage-qemux86-64.bin
 QEMUX86_64_DEFAULT_FSTYPE=ext3
-QEMUX86_64_DEFAULT_ROOTFS="core-image-sato-sdk core-image-sato core-image-lsb core-image-basic core-image-minimal"
 
 QEMUARM_DEFAULT_KERNEL=zImage-qemuarm.bin
 QEMUARM_DEFAULT_FSTYPE=ext3
-QEMUARM_DEFAULT_ROOTFS="core-image-sato-sdk core-image-sato core-image-lsb core-image-basic core-image-minimal"
 
 QEMUMIPS_DEFAULT_KERNEL=vmlinux-qemumips.bin
 QEMUMIPS_DEFAULT_FSTYPE=ext3
-QEMUMIPS_DEFAULT_ROOTFS="core-image-sato-sdk core-image-sato core-image-lsb core-image-basic core-image-minimal"
 
 QEMUPPC_DEFAULT_KERNEL=zImage-qemuppc.bin
 QEMUPPC_DEFAULT_FSTYPE=ext3
-QEMUPPC_DEFAULT_ROOTFS="core-image-sato-sdk core-image-sato core-image-lsb core-image-basic core-image-minimal"
 
 AKITA_DEFAULT_KERNEL=zImage-akita.bin
 AKITA_DEFAULT_FSTYPE=jffs2
-AKITA_DEFAULT_ROOTFS="core-image-sato"
 
 SPITZ_DEFAULT_KERNEL=zImage-spitz.bin
 SPITZ_DEFAULT_FSTYPE=ext3
-SPITZ_DEFAULT_ROOTFS="core-image-sato"
 
 setup_tmpdir() {
     if [ -z "$TMPDIR" ]; then
@@ -300,26 +293,28 @@ setup_sysroot() {
     fi 
 }
 
-# Locate a rootfs image based on defaults defined above
+# Locate a rootfs image to boot which matches our expected
+# machine and fstype. 
 findimage() {
     where=$1
     machine=$2
     extension=$3
-    names=$4
 
-    for name in $names; do
-        fullname=$where/$name-$machine.$extension
-        if [ -e "$fullname" ]; then
-            ROOTFS=$fullname
+    # Sort rootfs candidates by modification time - the most
+    # recently created one is the one we most likely want to boot.
+    filenames=`ls -t $where/*core-image*$machine.$extension 2>/dev/null | xargs`
+    for name in $filenames; do
+        if [[ "$name" =~ core-image-sato-sdk ||
+              "$name" =~ core-image-sato     ||
+              "$name" =~ core-image-lsb      ||
+              "$name" =~ core-image-basic    ||
+              "$name" =~ core-image-minimal ]]; then
+            ROOTFS=$name
             return
-        fi
-    done
-
-    echo "Couldn't find image in $where. Attempted image names were:"
-    for name in $names; do
-        echo $name-$machine.$extension
+        fi	
     done
 
+    echo "Couldn't find a $machine rootfs image in $where."
     exit 1
 }
 
@@ -376,7 +371,7 @@ if [ -z "$ROOTFS" ]; then
     setup_tmpdir
     T=$TMPDIR/deploy/images
     eval rootfs_list=\$${machine2}_DEFAULT_ROOTFS
-    findimage $T $MACHINE $FSTYPE "$rootfs_list"
+    findimage $T $MACHINE $FSTYPE
 
     if [ -z "$ROOTFS" ]; then
         echo "Error: Unable to determine default rootfs for MACHINE [$MACHINE]"
-- 
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