bug#20081: patch-source-shebangs crashes on broken symlink

[Tomáš Čech]

On Wed, Mar 11, 2015 at 06:32:30PM +0100, Andreas Enge wrote:
> On Wed, Mar 11, 2015 at 04:02:11PM +0100, Tomáš Čech wrote:
> > I'm trying to create package for taskwarrior.
> > Source tarball contain symlinks to nonexisting file `task':
>
> I would argue that this is not a bug in guix, but in the tarball.
> You can remove the link with an additional phase before 'configure, see, for
> instance, the dvdisaster package in cdrom.scm.

I agree with you that the fishy part is in tarball, but we could make
build more robust. Getting backtrace is not nice way to end a build.

And we alone are getting into this problem it is not usual to
preprocess source files before compilation.

I already worked around the bug to confirm I correctly identified the cause.

S_W