rebuild_check.py - mozsearch

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# This Source Code Form is subject to the terms of the Mozilla Public

# License, v. 2.0. If a copy of the MPL was not distributed with this

# file, You can obtain one at http://mozilla.org/MPL/2.0/.

import errno

import os

def mtime(path):

    try:

        return os.stat(path).st_mtime

    except OSError as e:

        if e.errno == errno.ENOENT:

            return -1

        raise

def rebuild_check(args):

    target = args[0]

    deps = args[1:]

    t = mtime(target)

    if t < 0:

        print(target)

        return

    newer = []

    removed = []

    for dep in deps:

        deptime = mtime(dep)

        if deptime < 0:

            removed.append(dep)

        elif deptime > t:

            newer.append(dep)

    def format_filelist(filelist):

        if not filelist:

            return None

        limit = 5

        length = len(filelist)

        if length < limit:

            return ", ".join(filelist)

        truncated = filelist[:limit]

        remaining = length - limit

        return "%s (and %d other files)" % (", ".join(truncated), remaining)

    newer = format_filelist(newer)

    removed = format_filelist(removed)

    if newer and removed:

        print(

            "Rebuilding %s because %s changed and %s was removed"

            % (target, newer, removed)

    elif newer:

        print("Rebuilding %s because %s changed" % (target, newer))

    elif removed:

        print("Rebuilding %s because %s was removed" % (target, removed))

    else:

        print("Rebuilding %s for an unknown reason" % target)

if __name__ == "__main__":

    import sys

    rebuild_check(sys.argv[1:])