Re: [Qemu-devel] [PATCH v4] module: Use QEMU_MODULE_DIR as a search path

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Jul 04, 2018 at 02:10:10PM -0400, ryang wrote:
> The current paths for modules are CONFIG_QEMU_MODDIR and paths relative
> to the executable. Qemu and its modules can be installed and executed in
> paths that are different from these search paths. This change allows
> a search path to be specified by environment variable.
> 
> An example usage for this is postmarketOS[1]. This is a build environment
> for Alpine Linux. It sets up Alpine Linux in a chroot environment.
> Alpine's Qemu packages are installed in the chroot. The Alpine Linux Qemu
> package is used to test compiled Alpine Linux system images. This way there
> isn't a reliance on the which ever version of Qemu the host system / distro
> provides.
> 
> postmarketOS executes Qemu on host system outside of the chroot
> The Qemu module search path needs to point to the location of the
> chroot relative to the host system.
> 
> e.g.
> The root of the Alpine Linux chroot is:
> ~/.local/var/pmbootstrap/chroot_native/
> 
> Alpine's Qemu is installed at
> ~/.local/var/pmbootstrap/chroot_native/usr/bin/
> 
> The Qemu module search path needs to be:
> QEMU_MODULE_DIR=~/.local/var/pmbootstrap/chroot_native/usr/lib/qemu/
> 
> [1] https://postmarketos.org/
> 
> Signed-off-by: ryang <decatf@gmail.com>
> ---
> 
> v2:
>  - fix checkpatch errors
> v3:
>  - initialize n_dirs variable
> v4:
>  - change env variable suffix from _PATH to _DIR
>  - renamed search_path to search_dir and make it const
> 
>  util/module.c | 22 ++++++++++++++--------
>  1 file changed, 14 insertions(+), 8 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

Regards,
Daniel
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