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Issue python#14642: Add "hg touch" extension, and "make touch" target.
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# -*- Makefile -*- | ||
# Define dependencies of generated files that are checked into hg. | ||
# The syntax of this file uses make rule dependencies, without actions | ||
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Python/importlib.h: Lib/importlib/_bootstrap.py Python/freeze_importlib.py | ||
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Include/ast.h: Parser/Python.asdl Parser/asdl.py Parser/asdl_c.py | ||
Python/Python-ast.c: Include/ast.h | ||
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Python/opcode_targets.h: Python/makeopcodetargets.py Lib/opcode.py | ||
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Objects/typeslots.inc: Include/typeslots.h Objects/typeslots.py |
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"""Bring time stamps of generated checked-in files into the right order | ||
A versioned configuration file .hgtouch specifies generated files, in the | ||
syntax of make rules. | ||
output: input1 input2 | ||
In addition to the dependency syntax, #-comments are supported. | ||
""" | ||
import os | ||
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def parse_config(repo): | ||
configfile = repo.wjoin(".hgtouch") | ||
if not os.path.exists(configfile): | ||
return {} | ||
result = {} | ||
with open(configfile) as f: | ||
for line in f: | ||
# strip comments | ||
line = line.split('#')[0].strip() | ||
if ':' not in line: | ||
continue | ||
outputs, inputs = line.split(':', 1) | ||
outputs = outputs.split() | ||
inputs = inputs.split() | ||
for o in outputs: | ||
try: | ||
result[o].extend(inputs) | ||
except KeyError: | ||
result[o] = inputs | ||
return result | ||
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def check_rule(ui, repo, modified, output, inputs): | ||
f_output = repo.wjoin(output) | ||
try: | ||
o_time = os.stat(f_output).st_mtime | ||
except OSError: | ||
ui.warn("Generated file %s does not exist\n" % output) | ||
return False | ||
need_touch = False | ||
backdate = None | ||
backdate_source = None | ||
for i in inputs: | ||
f_i = repo.wjoin(i) | ||
try: | ||
i_time = os.stat(f_i).st_mtime | ||
except OSError: | ||
ui.warn(".hgtouch input file %s does not exist\n" % i) | ||
return False | ||
if i in modified: | ||
# input is modified. Need to backdate at least to i_time | ||
if backdate is None or backdate > i_time: | ||
backdate = i_time | ||
backdate_source = i | ||
continue | ||
if o_time <= i_time: | ||
# generated file is older, touch | ||
need_touch = True | ||
if backdate is not None: | ||
ui.warn("Input %s for file %s locally modified\n" % (backdate_source, output)) | ||
# set to 1s before oldest modified input | ||
backdate -= 1 | ||
os.utime(f_output, (backdate, backdate)) | ||
return False | ||
if need_touch: | ||
ui.note("Touching %s\n" % output) | ||
os.utime(f_output, None) | ||
return True | ||
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def do_touch(ui, repo): | ||
modified = repo.status()[0] | ||
dependencies = parse_config(repo) | ||
success = True | ||
# try processing all rules in topological order | ||
hold_back = {} | ||
while dependencies: | ||
output, inputs = dependencies.popitem() | ||
# check whether any of the inputs is generated | ||
for i in inputs: | ||
if i in dependencies: | ||
hold_back[output] = inputs | ||
continue | ||
success = check_rule(ui, repo, modified, output, inputs) | ||
# put back held back rules | ||
dependencies.update(hold_back) | ||
hold_back = {} | ||
if hold_back: | ||
ui.warn("Cyclic dependency involving %s\n" % (' '.join(hold_back.keys()))) | ||
return False | ||
return success | ||
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def touch(ui, repo): | ||
"touch generated files that are older than their sources after an update." | ||
do_touch(ui, repo) | ||
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cmdtable = { | ||
"touch": (touch, [], | ||
"touch generated files according to the .hgtouch configuration") | ||
} |