[Bug 747095] New: Disable g-ir-scanner cache on build

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747095

            Bug ID: 747095
           Summary: Disable g-ir-scanner cache on build
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bilboed at bilboed.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

During compilation g-ir-scanner will use the user-local cache
(.cache/g-ir-scanner/). The problem is that it can create conflicts like this : 

Traceback (most recent call last):
  File "/usr/bin/g-ir-scanner", line 55, in <module>
    sys.exit(scanner_main(sys.argv))
  File "/usr/lib/gobject-introspection/giscanner/scannermain.py", line 476, in
scanner_main
    transformer = create_transformer(namespace, options)
  File "/usr/lib/gobject-introspection/giscanner/scannermain.py", line 343, in
create_transformer
    identifier_filter_cmd=options.identifier_filter_cmd)
  File "/usr/lib/gobject-introspection/giscanner/transformer.py", line 54, in
__init__
    self._cachestore = CacheStore()
  File "/usr/lib/gobject-introspection/giscanner/cachestore.py", line 86, in
__init__
    self._check_cache_version()
  File "/usr/lib/gobject-introspection/giscanner/cachestore.py", line 122, in
_check_cache_version
    shutil.move(versiontmp, version)
  File "/usr/lib/python2.7/shutil.py", line 302, in move
    copy2(src, real_dst)
  File "/usr/lib/python2.7/shutil.py", line 130, in copy2
    copyfile(src, dst)
  File "/usr/lib/python2.7/shutil.py", line 82, in copyfile
    with open(src, 'rb') as fsrc:
IOError: [Errno 2] No such file or directory:
'/var/lib/jenkins/.cache/g-ir-scanner/.cache-version.tmp'
Makefile:2002: recipe for target 'Gst-1.0.gir' failed


We should just disable cache usage during compilation, it's only really needed
for installed .gir/.typelib

This can be fixed by specifying GI_SCANNER_DISABLE_CACHE env variable for
internal compilation

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