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Date: Tue, 6 May 2014 12:23:11 +0200
From: Stefan Hajnoczi <stefanha@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] iotests: Use configured python
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To: Max Reitz <mreitz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel@nongnu.org

On Mon, May 05, 2014 at 06:25:38PM +0200, Max Reitz wrote:
> On 05.05.2014 14:26, Stefan Hajnoczi wrote:
> >On Sat, May 03, 2014 at 04:47:08PM +0200, Max Reitz wrote:
> >>@@ -56,22 +57,22 @@ for IMGOPTS in "compat=0.10" "compat=1.1"; do
> >>      echo === Create image with unknown header extension ===
> >>      echo
> >>      _make_test_img 64M
> >>-    ./qcow2.py "$TEST_IMG" add-header-ext 0x12345678 "This is a test header extension"
> >>-    ./qcow2.py "$TEST_IMG" dump-header
> >>+    $PYTHON qcow2.py "$TEST_IMG" add-header-ext 0x12345678 "This is a test header extension"
> >>+    $PYTHON qcow2.py "$TEST_IMG" dump-header
> >Please use "$PYTHON" to humor the people who like to put spaces in their
> >path names.
> 
> Following on Peter's explanation, me using ./configure
> --python=python2 results in PYTHON='python2 -B', which probably
> won't work so well with quotes around it.

You have a point, let's take the patch as-is.

> >>@@ -215,9 +222,16 @@ do
> >>          start=`_wallclock`
> >>          $timestamp && echo -n "        ["`date "+%T"`"]"
> >>-        [ ! -x $seq ] && chmod u+x $seq # ensure we can run it
> >>+
> >>+        if [ "$(head -n 1 $seq)" == "#!/usr/bin/env python" ]; then
> >>+            run_command="$PYTHON $seq"
> >The code generally uses the older `` notation instead of $().  Please
> >use ``.
> 
> If I'd send a v2 with ``, Eric would probably want me to send a v3
> with $(). ;-)
> 
> I personally don't really care what to use, but so far nobody has
> picked on me for using $(), whereas Eric once criticized my use of
> `` (which I had taken over from other tests).

Personally I'm a $() man.  Just pointed it out for consistency but it
seems nobody really likes `` anyway :-).

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan