[Xen-devel] Re: [PATCH] Expand non absolute paths in domain config to xen dir

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

Bastian Blank wrote:
> Hi folks
>
> The attached patch changes the behaviour of xm create to expand the
> values of kernel, ramdisk and device_model with the correct path within
> the xen dir if relative, like /usr/lib/xen/boot and /usr/lib/xen/bin.
>
> The old behaviour was unreliable as it used the working dir.
Why does that make it unreliable?

This patch will break a large number of existing configs that rely on 
relative path being the CWD.
I frequently make use of this behavior.

Regards,

Anthony Liguori

> This change makes it possible to use only relative paths for supplied
> parts like hvmloader and qemu-dm and don't rely on a known location.
>
> Bastian
>
>
>
> ------------------------------------------------------------------------
>
> diff -r 38f9bd7a4ce6 tools/python/xen/xm/create.py
> --- a/tools/python/xen/xm/create.py     Tue Oct 03 11:39:22 2006 +0100
> +++ b/tools/python/xen/xm/create.py     Tue Oct 03 19:45:29 2006 +0000
> @@ -460,6 +460,14 @@ def strip(pre, s):
>      else:
>          return s
>  
> +def abspath(file, dir):
> +    if file[0] == '/':
> +        return file
> +
> +    import xen.util.auxbin
> +    path = xen.util.auxbin.libpath()
> +    return os.path.join(path, dir, file)
> +
>  def configure_image(vals):
>      """Create the image config.
>      """
> @@ -467,9 +475,9 @@ def configure_image(vals):
>          return None
>      config_image = [ vals.builder ]
>      if vals.kernel:
> -        config_image.append([ 'kernel', os.path.abspath(vals.kernel) ])
> +        config_image.append([ 'kernel', abspath(vals.kernel, 'boot') ])
>      if vals.ramdisk:
> -        config_image.append([ 'ramdisk', os.path.abspath(vals.ramdisk) ])
> +        config_image.append([ 'ramdisk', abspath(vals.ramdisk, 'boot') ])
>      if vals.cmdline_ip:
>          cmdline_ip = strip('ip=', vals.cmdline_ip)
>          config_image.append(['ip', cmdline_ip])
> @@ -631,13 +639,15 @@ def configure_hvm(config_image, vals):
>  def configure_hvm(config_image, vals):
>      """Create the config for HVM devices.
>      """
> -    args = [ 'device_model', 'pae', 'vcpus', 'boot', 'fda', 'fdb',
> +    args = [ 'pae', 'vcpus', 'boot', 'fda', 'fdb',
>               'localtime', 'serial', 'stdvga', 'isa', 'nographic', 'soundhw',
>               'vnc', 'vncdisplay', 'vncunused', 'vncconsole', 'sdl', 'display',
>               'acpi', 'apic', 'xauthority', 'usb', 'usbdevice' ]
>      for a in args:
>          if (vals.__dict__[a]):
>              config_image.append([a, vals.__dict__[a]])
> +    if vals.device_model:
> +        config_image.append([ 'device_model', abspath(vals.device_model, 
> 'bin') ])
>  
>  def run_bootloader(vals, config_image):
>      if not os.access(vals.bootloader, os.X_OK):
>
>
> ------------------------------------------------------------------------
>
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