Re: [Qemu-devel] [PATCH] arch_init: Remove unnecessary default_config_files table

[Eduardo Habkost <ehabkost@redhat.com>]

On Wed, Jan 18, 2017 at 10:17:17AM +0100, Paolo Bonzini wrote:
> 
> 
> On 17/01/2017 19:00, Eduardo Habkost wrote:
> > The existing default_config_files table in arch_init.c has a
> > single entry, making it completely unnecessary. The whole code
> > can be replaced by a single qemu_read_config_file() call in vl.c.
> > 
> > Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> > ---
> >  include/qemu/config-file.h |  4 ----
> >  arch_init.c                | 27 ---------------------------
> >  vl.c                       | 18 ++++++++++++++----
> >  3 files changed, 14 insertions(+), 35 deletions(-)
> > 
> > diff --git a/include/qemu/config-file.h b/include/qemu/config-file.h
> > index 8d4b2b6d94..c80d5c8a33 100644
> > --- a/include/qemu/config-file.h
> > +++ b/include/qemu/config-file.h
> > @@ -23,8 +23,4 @@ int qemu_read_config_file(const char *filename);
> >  void qemu_config_parse_qdict(QDict *options, QemuOptsList **lists,
> >                               Error **errp);
> >  
> > -/* Read default QEMU config files
> > - */
> > -int qemu_read_default_config_files(bool userconfig);
> > -
> >  #endif /* QEMU_CONFIG_FILE_H */
> > diff --git a/arch_init.c b/arch_init.c
> > index 5cc58b2c35..e9b6d62d18 100644
> > --- a/arch_init.c
> > +++ b/arch_init.c
> > @@ -84,33 +84,6 @@ int graphic_depth = 32;
> >  
> >  const uint32_t arch_type = QEMU_ARCH;
> >  
> > -static struct defconfig_file {
> > -    const char *filename;
> > -    /* Indicates it is an user config file (disabled by -no-user-config) */
> > -    bool userconfig;
> > -} default_config_files[] = {
> > -    { CONFIG_QEMU_CONFDIR "/qemu.conf",                   true },
> > -    { NULL }, /* end of list */
> > -};
> > -
> > -int qemu_read_default_config_files(bool userconfig)
> > -{
> > -    int ret;
> > -    struct defconfig_file *f;
> > -
> > -    for (f = default_config_files; f->filename; f++) {
> > -        if (!userconfig && f->userconfig) {
> > -            continue;
> > -        }
> > -        ret = qemu_read_config_file(f->filename);
> > -        if (ret < 0 && ret != -ENOENT) {
> > -            return ret;
> > -        }
> > -    }
> > -
> > -    return 0;
> > -}
> > -
> >  struct soundhw {
> >      const char *name;
> >      const char *descr;
> > diff --git a/vl.c b/vl.c
> > index c643d3ff3a..b563f9b924 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -2990,6 +2990,18 @@ static int global_init_func(void *opaque, QemuOpts *opts, Error **errp)
> >      return 0;
> >  }
> >  
> > +static int qemu_read_default_config_file(void)
> > +{
> > +    int ret;
> > +
> > +    ret = qemu_read_config_file(CONFIG_QEMU_CONFDIR "/qemu.conf");
> > +    if (ret < 0 && ret != -ENOENT) {
> > +        return ret;
> > +    }
> > +
> > +    return 0;
> > +}
> > +
> >  int main(int argc, char **argv, char **envp)
> >  {
> >      int i;
> > @@ -3117,10 +3129,8 @@ int main(int argc, char **argv, char **envp)
> >          }
> >      }
> >  
> > -    if (defconfig) {
> > -        int ret;
> > -        ret = qemu_read_default_config_files(userconfig);
> > -        if (ret < 0) {
> > +    if (defconfig && userconfig) {
> > +        if (qemu_read_default_config_file() < 0) {
> >              exit(1);
> >          }
> >      }
> > 
> 
> Looks good!  Please include it yourself in your next pull request.
> 
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> 
> Though maybe we should just remove .conf file support completely...
> who's using it?!?

You mean removing /etc/qemu.conf, or removing -readconfig
completely?

The former doesn't seem to be used often. The latter looks very
useful for people trying to write scripts around QEMU and to
avoid command-line length limits, so I will be surprised if
nobody is using it.

-- 
Eduardo