Failure mode when a script fails is too verbose

Here's the output when a subcommand fails.

I think we shouldn't show all the backtrace goop since it obscures the 
command line.

________ running '/usr/bin/python src/tools/gyp/gyp_chromium' in 
'/work/chromium'
Package gtk+-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-2.0' found
Package gthread-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gthread-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gthread-2.0' found
Traceback (most recent call last):
  File "src/tools/gyp/gyp_chromium", line 34, in <module>
    sys.exit(gyp.main(args))
  File "src/tools/gyp/pylib/gyp/__init__.py", line 272, in main
Updating projects from gyp files...
    params)
  File "src/tools/gyp/pylib/gyp/__init__.py", line 76, in Load
    depth, generator_input_info)
  File "src/tools/gyp/pylib/gyp/input.py", line 1721, in Load
    LoadTargetBuildFile(build_file, data, aux_data, variables, includes, 
depth)
  File "src/tools/gyp/pylib/gyp/input.py", line 286, in LoadTargetBuildFile
    includes, depth)
  File "src/tools/gyp/pylib/gyp/input.py", line 286, in LoadTargetBuildFile
    includes, depth)
  File "src/tools/gyp/pylib/gyp/input.py", line 286, in LoadTargetBuildFile
    includes, depth)
  File "src/tools/gyp/pylib/gyp/input.py", line 244, in LoadTargetBuildFile
    build_file_path)
  File "src/tools/gyp/pylib/gyp/input.py", line 732, in 
ProcessVariablesAndConditionsInDict
    build_file)
  File "src/tools/gyp/pylib/gyp/input.py", line 748, in 
ProcessVariablesAndConditionsInList
    build_file)
  File "src/tools/gyp/pylib/gyp/input.py", line 725, in 
ProcessVariablesAndConditionsInDict
    build_file, key)
  File "src/tools/gyp/pylib/gyp/input.py", line 732, in 
ProcessVariablesAndConditionsInDict
    build_file)
  File "src/tools/gyp/pylib/gyp/input.py", line 752, in 
ProcessVariablesAndConditionsInList
    expanded = ExpandVariables(item, is_late, variables, build_file)
  File "src/tools/gyp/pylib/gyp/input.py", line 431, in ExpandVariables
    (contents, p.returncode))
Exception: Call to 'pkg-config --cflags gtk+-2.0 gthread-2.0' returned exit 
status 1. while loading dependencies of /work/chromium/src/base/base.gyp 
while loading dependencies of /work/chromium/src/app/app.gyp while loading 
dependencies of /work/chromium/src/build/all.gyp while trying to load 
src/build/all.gyp
failed to run command: /usr/bin/python src/tools/gyp/gyp_chromium
Original issue reported on code.google.com by evan@chromium.org on 11 Sep 2009 at 6:28
clar / gyp

Failure mode when a script fails is too verbose #78
