Mercurial > hg > fetch
annotate fetch/main.py @ 8:cf00d46b1bfb
pretend like we have a pluggable system to start debugging it
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Sun, 18 Sep 2011 18:46:31 -0700 |
| parents | 4d3d0e1324f5 |
| children | f8575a78ec06 |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python |
| 2 | |
| 3 """ | |
| 4 fetch stuff from the interwebs | |
| 5 """ | |
| 6 | |
| 7 import os | |
| 8 import sys | |
| 9 import optparse | |
| 10 | |
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11 __all__ = ['Fetcher', 'Fetch', 'main'] |
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12 |
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13 def which(executable, path=os.environ['PATH']): |
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14 """python equivalent of which; should really be in the stdlib""" |
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15 # XXX from https://github.com/mozautomation/mozmill/blob/master/mozrunner/mozrunner/utils.py |
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16 dirs = path.split(os.pathsep) |
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17 for dir in dirs: |
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18 if os.path.isfile(os.path.join(dir, fileName)): |
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19 return os.path.join(dir, fileName) |
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20 |
| 7 | 21 |
| 0 | 22 class Fetcher(object): |
| 23 """abstract base class for resource fetchers""" | |
| 24 | |
| 25 @classmethod | |
| 26 def match(cls, _type): | |
| 27 return _type == cls.type | |
| 28 | |
| 29 def __init__(self, url): | |
| 30 self.url = url | |
| 31 | |
| 32 def __call__(self, dest): | |
| 33 raise NotImplementedError | |
| 34 | |
| 7 | 35 ### standard dispatchers - always available |
| 0 | 36 |
| 7 | 37 import tarfile |
| 0 | 38 import urllib2 |
| 7 | 39 from StringIO import StringIO |
| 0 | 40 |
| 5 | 41 class FileFetcher(Fetcher): |
| 0 | 42 """fetch a single file""" |
| 43 | |
| 44 type = 'file' | |
| 45 | |
| 46 @classmethod | |
| 47 def download(cls, url): | |
| 48 return urllib2.urlopen(url).read() | |
| 49 | |
| 50 def __call__(self, dest): | |
| 51 if os.path.isdir(dest): | |
| 5 | 52 filename = self.url.rsplit('/', 1)[-1] |
| 0 | 53 dest = os.path.join(dest, filename) |
| 54 f = file(dest, 'w') | |
| 55 f.write(self.download(self.url)) | |
| 56 f.close() | |
| 57 | |
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58 |
| 5 | 59 class TarballFetcher(FileFetcher): |
| 0 | 60 """fetch and extract a tarball""" |
| 61 | |
| 62 type = 'tar' | |
| 63 | |
| 7 | 64 def __call__(self, dest): |
| 65 assert os.path.isdir(dest) | |
| 66 buffer = StringIO() | |
| 67 buffer.write(self.download(self.url)) | |
| 68 buffer.seek(0) | |
| 69 tf = tarfile.open(mode='r', fileobj=buffer) | |
| 70 tf.extract(dest) | |
| 71 | |
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72 fetchers = [FileFetcher, TarballFetcher] |
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73 |
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74 ### VCS fetchers using executable |
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75 |
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76 if which('hg'): |
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77 pass # TODO: wrap HgFetcher |
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78 |
| 5 | 79 class HgFetcher(Fetcher): |
| 0 | 80 """checkout a mercurial repository""" |
| 81 | |
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82 type = 'hg' |
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83 |
| 5 | 84 class GitFetcher(Fetcher): |
| 0 | 85 """checkout a git repository""" |
| 86 | |
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87 type = 'git' |
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88 |
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89 |
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90 fetcher_names = [cls.__name__ for cls in fetchers] |
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91 __all__ += fetcher_names |
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92 |
| 0 | 93 |
| 94 class Fetch(object): | |
| 95 | |
| 96 def __init__(self, fetchers, relative_to=None, strict=True): | |
| 97 self.fetchers = fetchers | |
| 98 self.relative_to = relative_to | |
| 99 self.strict = strict | |
| 100 | |
| 101 def fetcher(self, _type): | |
| 102 """find the fetcher for the appropriate type""" | |
| 103 for fetcher in fetchers: | |
| 104 if fetcher.match(_type): | |
| 105 return fetcher | |
| 106 | |
| 107 def __call__(self, url, destination, type, **options): | |
| 108 fetcher = self.fetcher(type) | |
| 109 assert fetcher is not None | |
| 110 fetcher = fetcher(url, **options) | |
| 111 fetcher(destination) | |
| 112 | |
| 113 def fetch(self, *items): | |
| 2 | 114 |
| 115 if self.strict: | |
| 116 # ensure all the required fetchers are available | |
| 117 types = set([i['type'] for i in items]) | |
| 118 assert not [i for i in types | |
| 119 if [True for fetcher in fetchers if fetcher.match(i)]] | |
| 120 | |
| 0 | 121 for item in items: |
| 4 | 122 |
| 123 # fix up relative paths | |
| 5 | 124 dest = item['dest'] |
| 4 | 125 if not os.path.isabs(dest): |
| 126 if self.relative_to: | |
| 127 dest = os.path.join(self.relative_to, dest) | |
| 128 else: | |
| 129 dest = os.path.join(os.path.dirname(os.path.abspath(item['manifest'])), dest) | |
| 130 | |
| 131 # fetch the items | |
| 132 self(item['url'], destination=dest, type=item['type'], **item['options']) | |
| 133 | |
| 0 | 134 |
| 135 format_string = "[URL] [destination] [type] <options>" | |
| 136 def read_manifests(*manifests): | |
| 137 """ | |
| 138 read some manifests and return the items | |
| 139 | |
| 140 Format: | |
| 141 %s | |
| 142 """ % format_string | |
| 143 | |
| 144 # sanity check | |
| 2 | 145 assert not [i for i in manifests if not os.path.exists(i)] |
| 0 | 146 |
| 147 retval = [] | |
| 148 | |
| 149 for manifest in manifests: | |
| 150 for line in file(i).readlines(): | |
| 151 line = line.strip() | |
| 3 | 152 if line.startswith('#') or not line: |
| 153 continue | |
| 0 | 154 line = line.split() |
| 155 if len(line) not in (3,4): | |
| 156 raise Exception("Format should be: %s; line %s" % (format_string, line)) | |
| 157 options = {} | |
| 158 if len(line) == 4: | |
| 159 option_string = line.pop().rstrip(',') | |
| 160 try: | |
| 161 options = dict([[j.strip() for j in i.split('=', 1)] | |
| 162 for i in option_string.split(',')]) | |
| 163 except: | |
| 164 raise Exception("Options format should be: key=value,key2=value2,...; got %s" % option_string) | |
| 165 | |
| 166 url, dest, _type = line | |
| 167 retval.append(dict(url=url, dest=dest, type=_type, options=options, manifest=manifest)) | |
| 168 return retval | |
| 169 | |
| 2 | 170 def main(args=sys.argv[1:]): |
| 0 | 171 |
| 172 # parse command line options | |
| 173 usage = '%prog [options] manifest [manifest] [...]' | |
| 174 | |
| 175 # description formatter | |
| 176 class PlainDescriptionFormatter(optparse.IndentedHelpFormatter): | |
| 177 def format_description(self, description): | |
| 178 if description: | |
| 179 return description + '\n' | |
| 180 else: | |
| 181 return '' | |
| 182 | |
| 183 parser = optparse.OptionParser(usage=usage, description=__doc__, formatter=PlainDescriptionFormatter()) | |
| 184 parser.add_option('-o', '--output', | |
| 185 help="output relative to this location vs. the manifest location") | |
| 186 parser.add_option('-d', '--dest', | |
| 187 action='append', | |
| 188 help="output only these destinations") | |
| 189 parser.add_option('-s', '--strict', | |
| 190 action='store_true', default=False, | |
| 191 help="fail on error") | |
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pretend like we have a pluggable system to start debugging it
Jeff Hammel <jhammel@mozilla.com>
parents:
7
diff
changeset
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192 parser.add_option('--list-fetchers', dest='list_fetchers', |
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193 action='store_true', default=False, |
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194 help='list available fetchers and exit') |
| 0 | 195 options, args = parser.parse_args(args) |
| 196 | |
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197 if options.list_fetchers: |
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198 for name in fetcher_names: |
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199 print name |
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200 parser.exit() |
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201 |
| 0 | 202 if not args: |
| 203 parser.print_help() | |
| 204 parser.exit() | |
| 205 | |
| 206 items = read_manifests(*args) | |
| 207 fetch = Fetch(fetchers, strict=options.strict) | |
| 208 | |
| 209 # download the files | |
| 210 fetch.fetch(*items) | |
| 211 | |
| 212 if __name__ == '__main__': | |
| 213 main() | |
| 214 |