|
| 1 | +"""Bring time stamps of generated checked-in files into the right order |
| 2 | +
|
| 3 | +A versioned configuration file .hgtouch specifies generated files, in the |
| 4 | +syntax of make rules. |
| 5 | +
|
| 6 | + output: input1 input2 |
| 7 | +
|
| 8 | +In addition to the dependency syntax, #-comments are supported. |
| 9 | +""" |
| 10 | +import os |
| 11 | + |
| 12 | +def parse_config(repo): |
| 13 | + configfile = repo.wjoin(".hgtouch") |
| 14 | + if not os.path.exists(configfile): |
| 15 | + return {} |
| 16 | + result = {} |
| 17 | + with open(configfile) as f: |
| 18 | + for line in f: |
| 19 | + # strip comments |
| 20 | + line = line.split('#')[0].strip() |
| 21 | + if ':' not in line: |
| 22 | + continue |
| 23 | + outputs, inputs = line.split(':', 1) |
| 24 | + outputs = outputs.split() |
| 25 | + inputs = inputs.split() |
| 26 | + for o in outputs: |
| 27 | + try: |
| 28 | + result[o].extend(inputs) |
| 29 | + except KeyError: |
| 30 | + result[o] = inputs |
| 31 | + return result |
| 32 | + |
| 33 | +def check_rule(ui, repo, modified, output, inputs): |
| 34 | + f_output = repo.wjoin(output) |
| 35 | + try: |
| 36 | + o_time = os.stat(f_output).st_mtime |
| 37 | + except OSError: |
| 38 | + ui.warn("Generated file %s does not exist\n" % output) |
| 39 | + return False |
| 40 | + need_touch = False |
| 41 | + backdate = None |
| 42 | + backdate_source = None |
| 43 | + for i in inputs: |
| 44 | + f_i = repo.wjoin(i) |
| 45 | + try: |
| 46 | + i_time = os.stat(f_i).st_mtime |
| 47 | + except OSError: |
| 48 | + ui.warn(".hgtouch input file %s does not exist\n" % i) |
| 49 | + return False |
| 50 | + if i in modified: |
| 51 | + # input is modified. Need to backdate at least to i_time |
| 52 | + if backdate is None or backdate > i_time: |
| 53 | + backdate = i_time |
| 54 | + backdate_source = i |
| 55 | + continue |
| 56 | + if o_time <= i_time: |
| 57 | + # generated file is older, touch |
| 58 | + need_touch = True |
| 59 | + if backdate is not None: |
| 60 | + ui.warn("Input %s for file %s locally modified\n" % (backdate_source, output)) |
| 61 | + # set to 1s before oldest modified input |
| 62 | + backdate -= 1 |
| 63 | + os.utime(f_output, (backdate, backdate)) |
| 64 | + return False |
| 65 | + if need_touch: |
| 66 | + ui.note("Touching %s\n" % output) |
| 67 | + os.utime(f_output, None) |
| 68 | + return True |
| 69 | + |
| 70 | +def do_touch(ui, repo): |
| 71 | + modified = repo.status()[0] |
| 72 | + dependencies = parse_config(repo) |
| 73 | + success = True |
| 74 | + # try processing all rules in topological order |
| 75 | + hold_back = {} |
| 76 | + while dependencies: |
| 77 | + output, inputs = dependencies.popitem() |
| 78 | + # check whether any of the inputs is generated |
| 79 | + for i in inputs: |
| 80 | + if i in dependencies: |
| 81 | + hold_back[output] = inputs |
| 82 | + continue |
| 83 | + success = check_rule(ui, repo, modified, output, inputs) |
| 84 | + # put back held back rules |
| 85 | + dependencies.update(hold_back) |
| 86 | + hold_back = {} |
| 87 | + if hold_back: |
| 88 | + ui.warn("Cyclic dependency involving %s\n" % (' '.join(hold_back.keys()))) |
| 89 | + return False |
| 90 | + return success |
| 91 | + |
| 92 | +def touch(ui, repo): |
| 93 | + "touch generated files that are older than their sources after an update." |
| 94 | + do_touch(ui, repo) |
| 95 | + |
| 96 | +cmdtable = { |
| 97 | + "touch": (touch, [], |
| 98 | + "touch generated files according to the .hgtouch configuration") |
| 99 | +} |
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