#!/usr/bin/env python

# Report significant differences in the buildhistory repository since a specific revision
#
# Copyright (C) 2013 Intel Corporation
# Author: Paul Eggleton <paul.eggleton@linux.intel.com>

import sys
import os
from distutils.version import LooseVersion

# Ensure PythonGit is installed (buildhistory_analysis needs it)
try:
    import git
except ImportError:
    print("Please install GitPython (python-git) 0.3.1 or later in order to use this script")
    sys.exit(1)

def main():
    if LooseVersion(git.__version__) < '0.3.1':
        sys.stderr.write("Version of GitPython is too old, please install GitPython (python-git) 0.3.1 or later in order to use this script\n")
        sys.exit(1)

    if len(sys.argv) < 3 or '--help' in sys.argv:
        print("Report significant differences in the buildhistory repository")
        print("Syntax: %s <buildhistory-path> <since-revision> [to-revision]" % os.path.basename(sys.argv[0]))
        print("If to-revision is not specified, it defaults to HEAD")
        sys.exit(1)

    # Set path to OE lib dir so we can import the buildhistory_analysis module
    basepath = os.path.abspath(os.path.dirname(os.path.abspath(sys.argv[0])) + '/..')
    newpath = basepath + '/meta/lib'
    # Set path to bitbake lib dir so the buildhistory_analysis module can load bb.utils
    if os.path.exists(basepath + '/bitbake/lib/bb'):
        bitbakepath = basepath + '/bitbake'
    else:
        # look for bitbake/bin dir in PATH
        bitbakepath = None
        for pth in os.environ['PATH'].split(':'):
            if os.path.exists(os.path.join(pth, '../lib/bb')):
                bitbakepath = os.path.abspath(os.path.join(pth, '..'))
                break
        if not bitbakepath:
            sys.stderr.write("Unable to find bitbake by searching parent directory of this script or PATH\n")
            sys.exit(1)

    sys.path[0:0] = [newpath, bitbakepath + '/lib']
    import oe.buildhistory_analysis

    buildhistory_dir = sys.argv[1]
    if not os.path.exists(buildhistory_dir):
        sys.stderr.write('Specified buildhistory directory "%s" does not exist\n' % buildhistory_dir)
        sys.exit(1)

    if len(sys.argv) > 3:
        torev = sys.argv[3]
    else:
        torev = 'HEAD'

    import gitdb
    try:
        changes = oe.buildhistory_analysis.process_changes(buildhistory_dir, sys.argv[2], torev)
    except gitdb.exc.BadObject as e:
        sys.stderr.write('Specified git revision "%s" is not valid\n' % e.args[0])
        sys.exit(1)

    for chg in changes:
        print('%s' % chg)

    sys.exit(0)


if __name__ == "__main__":
    main()