[OE-core] [PATCH v2] ddimage: Support Mac OS

[Darren Hart]

Update the ddimage script to allow it to work on Mac OS too. The biggest
difference is sysfs vs diskutil and in the syntax of the stat command
between Mac OS and Linux, unfortunately. Workarounds using ls, cut, and
columns got really fragile really quickly. Relying on stat and switching
on uname seemed the more robust solution.

Signed-off-by: Darren Hart <dvhart at linux.intel.com>
Cc: Koen Kooi <koen at dominion.thruhere.net>
---

v2: Correct disk3 to disk2 in the default blacklist per Koen's feedback

 scripts/contrib/ddimage | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/scripts/contrib/ddimage b/scripts/contrib/ddimage
index 93ebeaf..a503f11 100755
--- a/scripts/contrib/ddimage
+++ b/scripts/contrib/ddimage
@@ -1,7 +1,8 @@
 #!/bin/sh
 
-#BLACKLIST_DEVICES="/dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde"
-BLACKLIST_DEVICES="/dev/sda"
+# Default to avoiding the first two disks on typical Linux and Mac OS installs
+# Better safe than sorry :-)
+BLACKLIST_DEVICES="/dev/sda /dev/sdb /dev/disk1 /dev/disk2"
 
 # 1MB blocksize
 BLOCKSIZE=1048576
@@ -14,9 +15,15 @@ image_details() {
 	IMG=$1
 	echo "Image details"
 	echo "============="
-	echo "    image: $(stat --printf '%N\n' $IMG)"
-	echo "     size: $(stat -L --printf '%s bytes\n' $IMG)"
-	echo " modified: $(stat -L --printf '%y\n' $IMG)"
+	echo "    image: $(basename $IMG)"
+	# stat format is different on Mac OS and Linux
+	if [ "$(uname)" = "Darwin" ]; then
+		echo "     size: $(stat -L -f '%z bytes' $IMG)"
+		echo " modified: $(stat -L -f '%Sm' $IMG)"
+	else
+		echo "     size: $(stat -L -c '%s bytes' $IMG)"
+		echo " modified: $(stat -L -c '%y' $IMG)"
+	fi
 	echo "     type: $(file -L -b $IMG)"
 	echo ""
 }
@@ -27,6 +34,14 @@ device_details() {
 
 	echo "Device details"
 	echo "=============="
+
+	# Collect disk info using diskutil on Mac OS
+	if [ "$(uname)" = "Darwin" ]; then
+		diskutil info $DEVICE | egrep "(Device Node|Media Name|Total Size)"
+		return
+	fi
+
+	# Default / Linux information collection
 	echo "  device: $DEVICE"
 	if [ -f "/sys/class/block/$DEV/device/vendor" ]; then
 		echo "  vendor: $(cat /sys/class/block/$DEV/device/vendor)"
-- 
1.9.1