xref: /gem5/site_scons/site_tools/git.py

# Copyright (c) 2013, 2015-2017 ARM Limited
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#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
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# to a hardware implementation of the functionality of the software
# licensed hereunder.  You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
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# modified or unmodified, in source code or in binary form.
#
# Copyright (c) 2011 Advanced Micro Devices, Inc.
# Copyright (c) 2009 The Hewlett-Packard Development Company
# Copyright (c) 2004-2005 The Regents of The University of Michigan
# All rights reserved.
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# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
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import os

import gem5_scons.util
from m5.util import readCommand

git_style_message = """
You're missing the gem5 style or commit message hook. These hooks help
to ensure that your code follows gem5's style rules on git commit.
This script will now install the hook in your .git/hooks/ directory.
Press enter to continue, or ctrl-c to abort: """

def install_style_hooks(env):
    try:
        gitdir = env.Dir(readCommand(
            ["git", "rev-parse", "--git-dir"]).strip("\n"))
    except Exception, e:
        print "Warning: Failed to find git repo directory: %s" % e
        return

    git_hooks = gitdir.Dir("hooks")
    def hook_exists(hook_name):
        hook = git_hooks.File(hook_name)
        return hook.exists()

    def hook_install(hook_name, script):
        hook = git_hooks.File(hook_name)
        if hook.exists():
            print "Warning: Can't install %s, hook already exists." % hook_name
            return

        if hook.islink():
            print "Warning: Removing broken symlink for hook %s." % hook_name
            os.unlink(hook.get_abspath())

        if not git_hooks.exists():
            os.mkdir(git_hooks.get_abspath())
            git_hooks.clear()

        abs_symlink_hooks = git_hooks.islink() and \
            os.path.isabs(os.readlink(git_hooks.get_abspath()))

        # Use a relative symlink if the hooks live in the source directory,
        # and the hooks directory is not a symlink to an absolute path.
        if hook.is_under(env.root) and not abs_symlink_hooks:
            script_path = os.path.relpath(
                os.path.realpath(script.get_abspath()),
                os.path.realpath(hook.Dir(".").get_abspath()))
        else:
            script_path = script.get_abspath()

        try:
            os.symlink(script_path, hook.get_abspath())
        except:
            print "Error updating git %s hook" % hook_name
            raise

    if hook_exists("pre-commit") and hook_exists("commit-msg"):
        return

    print git_style_message,
    try:
        raw_input()
    except:
        print "Input exception, exiting scons.\n"
        sys.exit(1)

    git_style_script = env.root.Dir("util").File("git-pre-commit.py")
    git_msg_script = env.root.Dir("ext").File("git-commit-msg")

    hook_install("pre-commit", git_style_script)
    hook_install("commit-msg", git_msg_script)

def generate(env):
    if exists(env) and not gem5_scons.util.ignore_style():
        install_style_hooks(env)

def exists(env):
    return env.Entry('#.git').exists()