| Martin v. Loewis | cfc1cc2 | 2012-04-27 16:10:21 +0200 | [diff] [blame^] | 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 | } |