[Mesa-dev] [PATCH v2] meson, install_megadrivers: Also remove stale symlinks

[Gert Wollny]

Am Montag, den 06.08.2018, 16:59 +0100 schrieb Eric Engestrom:
> On Monday, 2018-08-06 09:41:48 +0200, Gert Wollny wrote:
> > os.path.exists doesn't return True for stale symlinks, but they are
> > in
> > the way later, when a link/file with the same name is to be
> > created.
> > For instance it is conceivable that the pointed to file is replaced
> > by
> > a file with a new name, and then the symlink is dead.
> > 
> > To handle this check specifically for all existing symlinks to be
> > removed. (This bugged me for some time with a link libXvMCr600.so
> > always being in the way of installing this file)
> > 
> > v2: use only os.path.lexist and replace all instances
> >     of os.path.exist (Dylan Baker)
> > 
> > Fixes: f7f1b30f81e842db6057591470ce3cb6d4fb2795
> >   ("meson: extend install_megadrivers script to handle
> > symmlinking")
> > 
> > Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
> > ---
> >  bin/install_megadrivers.py | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/bin/install_megadrivers.py
> > b/bin/install_megadrivers.py
> > index 8d9ed9c6dc..3a31fddd89 100755
> > --- a/bin/install_megadrivers.py
> > +++ b/bin/install_megadrivers.py
> > @@ -42,14 +42,14 @@ def main():
> >  
> >      master = os.path.join(to, os.path.basename(args.megadriver))
> >  
> > -    if not os.path.exists(to):
> > +    if not os.path.lexists(to):
> >          os.makedirs(to)

> 
> I'm not convinced on this one: if the `to` destination is a symlink
> but the destination of the symlink doesn't exist, we shouldn't just
> consider that the folder has already been created and is ready for
> use.
You're right, I guess it was too early this morning, so that I just
changed all instances of os.exists mechnically, 


> 
> I think here we should either just ignore that case, or if we want to
> handle it then it should be:
>   if not exists(to):
>       if lexists(to):
>           unlink(to)
>       makedirs(to)
Fixes like this locally. 

best, 
Gert

> 
> The other two below are
> Reviewed-by: Eric Engestrom <eric.engestrom at intel.com>
> 
> >      shutil.copy(args.megadriver, master)
> >  
> >      for driver in args.drivers:
> >          abs_driver = os.path.join(to, driver)
> >  
> > -        if os.path.exists(abs_driver):
> > +        if os.path.lexists(abs_driver):
> >              os.unlink(abs_driver)
> >          print('installing {} to {}'.format(args.megadriver,
> > abs_driver))
> >          os.link(master, abs_driver)
> > @@ -60,7 +60,7 @@ def main():
> >  
> >              name, ext = os.path.splitext(driver)
> >              while ext != '.so':
> > -                if os.path.exists(name):
> > +                if os.path.lexists(name):
> >                      os.unlink(name)
> >                  os.symlink(driver, name)
> >                  name, ext = os.path.splitext(name)
> > -- 
> > 2.16.4
> > 
> > _______________________________________________
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