gecko-dev/config/rebuild_check.py

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Python
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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/.
from __future__ import absolute_import, print_function, unicode_literals
import os
import errno
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:])