[GRASS-dev] r.unpack: unhelpful error message when projection info does not match

[Markus Neteler]

Hi,

the error (example UTM map import into LAEA location):

r.unpack landcover_1m.pack
ERROR: Projection information does not match. Aborting.

is rather unhelpful. The code is:

    # check projection compatibility in a rather crappy way
    if not grass.compare_key_value_text_files('PROJ_INFO',
os.path.join(mset_dir, '..', 'PERMANENT', 'PROJ_INFO')) or \
            not grass.compare_key_value_text_files('PROJ_UNITS',
os.path.join(mset_dir, '..', 'PERMANENT', 'PROJ_UNITS')):
        if flags['o']:
            grass.warning(_("Projection information does not match.
Proceeding..."))
        else:
            grass.fatal(_("Projection information does not match. Aborting."))

I would suggest to print a "diff -u file1 file2" rather than nothing
as now (perhaps Python offers a nice way to show the wrong keys to the
user).
Or are there other options?

Markus