printdeps.py

#!/usr/bin/env nix-shell
#!nix-shell -i python -p python2

import gclient_eval

# Normally set in gclient.py
target_os = [ "android" ]
target_cpu = [ "arm64" ]
builtin_vars={
    'checkout_android': 'android' in target_os,
    'checkout_chromeos': 'chromeos' in target_os,
    'checkout_fuchsia': 'fuchsia' in target_os,
    'checkout_ios': 'ios' in target_os,
    'checkout_linux': 'unix' in target_os,
    'checkout_mac': 'mac' in target_os,
    'checkout_win': 'win' in target_os,

    'checkout_arm': 'arm' in target_cpu,
    'checkout_arm64': 'arm64' in target_cpu,
    'checkout_x86': 'x86' in target_cpu,
    'checkout_mips': 'mips' in target_cpu,
    'checkout_mips64': 'mips64' in target_cpu,
    'checkout_ppc': 'ppc' in target_cpu,
    'checkout_s390': 's390' in target_cpu,
    'checkout_x64': 'x64' in target_cpu,

    'host_os': 'linux', # See _PLATFORM_MARPPING in tools/gclient.py
    'host_cpu': 'x64', # See tools/detect_host_arch.py. Luckily this variable is not really currently used much
}

f = open('flat').read()
v = gclient_eval.Parse(f, validate_syntax=True, filename='DEPS',
                       vars_override={}, builtin_vars=builtin_vars)

merged_vars = dict(v['vars'])
merged_vars.update(builtin_vars)

for dep, fields in v['deps'].iteritems():
    # Skip dependency if its condition evaluates to False
    if 'condition' in fields:
        if not gclient_eval.EvaluateCondition(fields['condition'], merged_vars):
            continue

    if fields['dep_type'] == "git":
        url, rev = fields['url'].split('@')
        print url, rev

    elif fields['dep_type'] == "cipd":
        for p in fields['packages']:
            package, version = p['package'], p['version']
            print package, version

    else:
        raise ValueError("Unrecognized dep_type", fields['dep_type'])