Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/setuptools/_distutils/dep_util.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """distutils.dep_util |
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2 |
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3 Utility functions for simple, timestamp-based dependency of files |
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4 and groups of files; also, function based entirely on such |
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5 timestamp dependency analysis.""" |
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6 |
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7 import os |
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8 from distutils.errors import DistutilsFileError |
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9 |
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10 |
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11 def newer (source, target): |
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12 """Return true if 'source' exists and is more recently modified than |
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13 'target', or if 'source' exists and 'target' doesn't. Return false if |
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14 both exist and 'target' is the same age or younger than 'source'. |
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15 Raise DistutilsFileError if 'source' does not exist. |
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16 """ |
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17 if not os.path.exists(source): |
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18 raise DistutilsFileError("file '%s' does not exist" % |
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19 os.path.abspath(source)) |
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20 if not os.path.exists(target): |
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21 return 1 |
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22 |
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23 from stat import ST_MTIME |
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24 mtime1 = os.stat(source)[ST_MTIME] |
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25 mtime2 = os.stat(target)[ST_MTIME] |
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26 |
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27 return mtime1 > mtime2 |
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28 |
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29 # newer () |
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30 |
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31 |
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32 def newer_pairwise (sources, targets): |
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33 """Walk two filename lists in parallel, testing if each source is newer |
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34 than its corresponding target. Return a pair of lists (sources, |
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35 targets) where source is newer than target, according to the semantics |
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36 of 'newer()'. |
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37 """ |
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38 if len(sources) != len(targets): |
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39 raise ValueError("'sources' and 'targets' must be same length") |
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40 |
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41 # build a pair of lists (sources, targets) where source is newer |
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42 n_sources = [] |
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43 n_targets = [] |
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44 for i in range(len(sources)): |
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45 if newer(sources[i], targets[i]): |
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46 n_sources.append(sources[i]) |
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47 n_targets.append(targets[i]) |
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48 |
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49 return (n_sources, n_targets) |
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50 |
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51 # newer_pairwise () |
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52 |
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53 |
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54 def newer_group (sources, target, missing='error'): |
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55 """Return true if 'target' is out-of-date with respect to any file |
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56 listed in 'sources'. In other words, if 'target' exists and is newer |
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57 than every file in 'sources', return false; otherwise return true. |
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58 'missing' controls what we do when a source file is missing; the |
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59 default ("error") is to blow up with an OSError from inside 'stat()'; |
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60 if it is "ignore", we silently drop any missing source files; if it is |
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61 "newer", any missing source files make us assume that 'target' is |
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62 out-of-date (this is handy in "dry-run" mode: it'll make you pretend to |
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63 carry out commands that wouldn't work because inputs are missing, but |
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64 that doesn't matter because you're not actually going to run the |
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65 commands). |
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66 """ |
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67 # If the target doesn't even exist, then it's definitely out-of-date. |
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68 if not os.path.exists(target): |
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69 return 1 |
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70 |
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71 # Otherwise we have to find out the hard way: if *any* source file |
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72 # is more recent than 'target', then 'target' is out-of-date and |
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73 # we can immediately return true. If we fall through to the end |
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74 # of the loop, then 'target' is up-to-date and we return false. |
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75 from stat import ST_MTIME |
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76 target_mtime = os.stat(target)[ST_MTIME] |
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77 for source in sources: |
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78 if not os.path.exists(source): |
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79 if missing == 'error': # blow up when we stat() the file |
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80 pass |
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81 elif missing == 'ignore': # missing source dropped from |
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82 continue # target's dependency list |
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83 elif missing == 'newer': # missing source means target is |
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84 return 1 # out-of-date |
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85 |
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86 source_mtime = os.stat(source)[ST_MTIME] |
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87 if source_mtime > target_mtime: |
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88 return 1 |
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89 else: |
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90 return 0 |
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91 |
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92 # newer_group () |