Mercurial > hg > fetch
annotate fetch.py @ 26:d495b610046a
more stubbing; tests work again
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Mon, 14 Nov 2011 21:25:56 -0800 |
| parents | e628ce3ae49f |
| children | 423b67ff4512 |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python |
| 2 | |
| 3 """ | |
| 4 fetch stuff from the interwebs | |
| 5 """ | |
| 6 | |
| 7 import os | |
| 23 | 8 import shutil |
| 0 | 9 import sys |
| 10 import optparse | |
| 11 | |
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12 __all__ = ['Fetcher', 'Fetch', 'main'] |
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13 |
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14 def which(executable, path=os.environ['PATH']): |
| 15 | 15 """python equivalent of which; should really be in the stdlib""" |
| 16 dirs = path.split(os.pathsep) | |
| 17 for dir in dirs: | |
| 18 if os.path.isfile(os.path.join(dir, executable)): | |
| 19 return os.path.join(dir, executable) | |
| 7 | 20 |
| 0 | 21 class Fetcher(object): |
| 15 | 22 """abstract base class for resource fetchers""" |
| 0 | 23 |
| 15 | 24 @classmethod |
| 25 def match(cls, _type): | |
| 26 return _type == cls.type | |
| 0 | 27 |
| 23 | 28 def __init__(self, url, clobber=True): |
| 17 | 29 self.subpath = None |
| 30 if '#' in url: | |
| 31 url, self.subpath = url.rsplit('#') | |
| 25 | 32 if self.subpath: |
| 33 self.subpath = self.subpath.split('/') | |
| 15 | 34 self.url = url |
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35 self._clobber = clobber |
| 0 | 36 |
| 15 | 37 def __call__(self, dest): |
| 17 | 38 raise NotImplementedError("Should be called by implementing class") |
| 39 | |
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40 def clobber(self, dest): |
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41 """clobbers if self._clobber is set""" |
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42 if self._clobber and os.path.exists(dest): |
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43 if os.path.isfile(dest): |
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44 os.remove(dest) |
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45 else: |
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46 shutil.rmtree(dest) |
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47 |
| 17 | 48 @classmethod |
| 49 def doc(cls): | |
| 50 """return docstring for the instance""" | |
| 51 retval = getattr(cls, '__doc__', '').strip() | |
| 52 return ' '.join(retval.split()) | |
| 0 | 53 |
| 7 | 54 ### standard dispatchers - always available |
| 0 | 55 |
| 7 | 56 import tarfile |
| 0 | 57 import urllib2 |
| 7 | 58 from StringIO import StringIO |
| 0 | 59 |
| 5 | 60 class FileFetcher(Fetcher): |
| 15 | 61 """fetch a single file""" |
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62 # Note: subpath and clobber for single files are ignored |
| 0 | 63 |
| 15 | 64 type = 'file' |
| 0 | 65 |
| 15 | 66 @classmethod |
| 67 def download(cls, url): | |
| 68 return urllib2.urlopen(url).read() | |
| 0 | 69 |
| 15 | 70 def __call__(self, dest): |
| 25 | 71 |
| 15 | 72 if os.path.isdir(dest): |
| 73 filename = self.url.rsplit('/', 1)[-1] | |
| 74 dest = os.path.join(dest, filename) | |
| 75 f = file(dest, 'w') | |
| 76 f.write(self.download(self.url)) | |
| 77 f.close() | |
| 0 | 78 |
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79 |
| 5 | 80 class TarballFetcher(FileFetcher): |
| 15 | 81 """fetch and extract a tarball""" |
| 0 | 82 |
| 15 | 83 type = 'tar' |
| 0 | 84 |
| 15 | 85 def __call__(self, dest): |
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86 if self.clobber: |
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87 shutil.rmtree(dest) |
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88 if os.path.exists(dest): |
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89 assert os.path.isdir(dest), "Destination must be a directory" |
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90 else: |
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91 os.mkdirs(dest) |
| 17 | 92 if self.subpath: |
| 93 raise NotImplementedError("should extract only a subpath of a tarball but I haven't finished it yet") | |
| 15 | 94 buffer = StringIO() |
| 95 buffer.write(self.download(self.url)) | |
| 96 buffer.seek(0) | |
| 97 tf = tarfile.open(mode='r', fileobj=buffer) | |
| 98 tf.extract(dest) | |
| 7 | 99 |
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100 fetchers = [FileFetcher, TarballFetcher] |
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101 |
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102 ### VCS fetchers |
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103 |
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104 import subprocess |
| 19 | 105 try: |
| 106 from subprocess import check_call as call | |
| 107 except ImportErorr: | |
| 108 raise # we need check_call, kinda | |
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109 |
| 17 | 110 class VCSFetcher(Fetcher): |
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111 |
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112 command = None |
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113 |
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114 def call(*args, **kwargs): |
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115 assert command is not None, "Abstract base class" |
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116 call([self.command] + list(args), **kwargs) |
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117 |
| 17 | 118 def __init__(self, url, export=True): |
| 119 """ | |
| 120 - export : whether to strip the versioning information | |
| 121 """ | |
| 122 Fetcher.__init__(self, url) | |
| 123 self.export = export | |
| 124 | |
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125 def __call__(self, dest): |
| 25 | 126 |
| 127 if self.subpath or self.export: | |
| 128 # can only export with a subpath | |
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129 self.export(dest, subpath=self.subpath) |
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130 return |
| 25 | 131 |
| 132 if os.path.exists(dest): | |
| 133 assert os.path.isdir(dest) | |
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134 self.clone(dest) |
| 25 | 135 |
| 136 def export(self, dest): | |
| 137 """ | |
| 138 export a clone of the directory | |
| 139 """ | |
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140 dest = os.path.abspath(dest) |
| 25 | 141 tmpdir = tempfile.mkdtmp() |
| 142 self.clone(tmpdir) | |
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143 path = tmpdir |
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144 if self.subpath: |
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145 path = os.path.join([tmpdir] + self.subpath) |
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146 assert os.path.exists(path), "subpath %s of %s not found" % (os.path.sep.join(self.subpath), self.url) |
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147 self.clobber(dest) |
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148 if os.path.isdir(path): |
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149 if os.path.exists(dest): |
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150 assert os.path.isdir(dest), "source is a directory; destination is a file" |
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151 else: |
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152 os.makedirs(dest) |
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153 else: |
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154 if os.path.exists(dest): |
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155 assert os.path.isfile(dest), "" |
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156 else: |
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157 directory, filename = os.path.split(dest) |
| 25 | 158 shutil.rmtree(tmpdir) |
| 159 | |
| 160 def clone(self, dest): | |
| 161 """ | |
| 162 clones into a directory | |
| 163 """ | |
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164 raise NotImplementedError("Abstract base class") |
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165 |
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166 def update(self, dest): |
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167 """ |
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168 updates a checkout |
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169 """ |
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170 raise NotImplementedError("Abstract base class") |
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171 |
| 25 | 172 |
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173 if which('hg'): |
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174 |
| 17 | 175 class HgFetcher(VCSFetcher): |
| 15 | 176 """checkout a mercurial repository""" |
| 177 type = 'hg' | |
| 0 | 178 |
| 19 | 179 def __init__(self, url, export=True): |
| 180 VCSFetcher.__init__(self, url, export=True) | |
| 181 self.hg = which('hg') | |
| 25 | 182 assert self.hg, "'hg' command not found" |
| 19 | 183 |
| 15 | 184 def __call__(self, dest): |
| 23 | 185 if os.path.exists(dest): |
| 15 | 186 assert os.path.isdir(dest) and os.path.exists(os.path.join(dest, '.hg')) |
| 19 | 187 call([self.hg, 'pull', self.url], cwd=dest) |
| 188 call([self.hg, 'update'], cwd=dest) | |
| 189 else: | |
| 23 | 190 if not os.path.exists(dest): |
| 191 os.mkdirs(dest) | |
| 192 call([self.hg, 'clone', self.url, dest]) | |
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193 |
| 15 | 194 fetchers.append(HgFetcher) |
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195 |
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196 |
| 15 | 197 if which('git'): |
| 17 | 198 |
| 15 | 199 class GitFetcher(Fetcher): |
| 200 """checkout a git repository""" | |
| 201 type = 'git' | |
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202 |
| 20 | 203 def __init__(self, url, export=True): |
| 204 VCSFetcher.__init__(self, url, export=True) | |
| 23 | 205 self.git = which('git') |
| 206 | |
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207 def __call__(self, dest): |
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208 if os.path.exists(dest): |
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209 assert os.path.isdir(dest) and os.path.exists(os.path.join(dest, '.git')) |
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210 call([self.git, 'pull', self.url], cwd=dest) |
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211 call([self.hg, 'update'], cwd=dest) |
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212 else: |
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213 if not os.path.exists(dest): |
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214 os.mkdirs(dest) |
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215 call([self.hg, 'clone', self.url, dest]) |
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216 |
| 20 | 217 |
| 218 fetchers.append(GitFetcher) | |
| 17 | 219 |
| 16 | 220 __all__ += [i.__name__ for i in fetchers] |
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221 |
| 0 | 222 class Fetch(object): |
| 223 | |
| 21 | 224 def __init__(self, fetchers=fetchers[:], relative_to=None, strict=True): |
| 15 | 225 self.fetchers = fetchers |
| 226 self.relative_to = relative_to | |
| 227 self.strict = strict | |
| 0 | 228 |
| 15 | 229 def fetcher(self, _type): |
| 230 """find the fetcher for the appropriate type""" | |
| 231 for fetcher in fetchers: | |
| 232 if fetcher.match(_type): | |
| 233 return fetcher | |
| 0 | 234 |
| 15 | 235 def __call__(self, url, destination, type, **options): |
| 236 fetcher = self.fetcher(type) | |
| 237 assert fetcher is not None, "No fetcher found for type '%s'" % type | |
| 238 fetcher = fetcher(url, **options) | |
| 239 fetcher(destination) | |
| 2 | 240 |
| 15 | 241 def fetch(self, *items): |
| 2 | 242 |
| 15 | 243 if self.strict: |
| 244 # ensure all the required fetchers are available | |
| 245 types = set([i['type'] for i in items]) | |
| 246 assert not [i for i in types | |
| 247 if [True for fetcher in fetchers if fetcher.match(i)]] | |
| 4 | 248 |
| 15 | 249 for item in items: |
| 4 | 250 |
| 15 | 251 # fix up relative paths |
| 252 dest = item['dest'] | |
| 253 if not os.path.isabs(dest): | |
| 254 relative_to = self.relative_to or os.path.dirname(os.path.abspath(item['manifest'])) | |
| 255 dest = os.path.join(relative_to, dest) | |
| 4 | 256 |
| 15 | 257 # fetch the items |
| 258 self(item['url'], destination=dest, type=item['type'], **item['options']) | |
| 0 | 259 |
| 21 | 260 |
| 0 | 261 format_string = "[URL] [destination] [type] <options>" |
| 262 def read_manifests(*manifests): | |
| 15 | 263 """ |
| 264 read some manifests and return the items | |
| 265 | |
| 266 Format: | |
| 267 %s | |
| 268 """ % format_string | |
| 0 | 269 |
| 15 | 270 # sanity check |
| 271 assert not [i for i in manifests if not os.path.exists(i)] | |
| 0 | 272 |
| 15 | 273 retval = [] |
| 0 | 274 |
| 15 | 275 for manifest in manifests: |
| 276 for line in file(i).readlines(): | |
| 277 line = line.strip() | |
| 278 if line.startswith('#') or not line: | |
| 279 continue | |
| 280 line = line.split() | |
| 281 if len(line) not in (3,4): | |
| 282 raise Exception("Format should be: %s; line %s" % (format_string, line)) | |
| 283 options = {} | |
| 284 if len(line) == 4: | |
| 285 option_string = line.pop().rstrip(',') | |
| 286 try: | |
| 287 options = dict([[j.strip() for j in i.split('=', 1)] | |
| 288 for i in option_string.split(',')]) | |
| 289 except: | |
| 290 raise Exception("Options format should be: key=value,key2=value2,...; got %s" % option_string) | |
| 0 | 291 |
| 15 | 292 url, dest, _type = line |
| 293 retval.append(dict(url=url, dest=dest, type=_type, options=options, manifest=manifest)) | |
| 294 return retval | |
| 0 | 295 |
| 2 | 296 def main(args=sys.argv[1:]): |
| 0 | 297 |
| 15 | 298 # parse command line options |
| 299 usage = '%prog [options] manifest [manifest] [...]' | |
| 0 | 300 |
| 15 | 301 class PlainDescriptionFormatter(optparse.IndentedHelpFormatter): |
| 302 def format_description(self, description): | |
| 303 if description: | |
| 304 return description + '\n' | |
| 305 else: | |
| 306 return '' | |
| 0 | 307 |
| 15 | 308 parser = optparse.OptionParser(usage=usage, description=__doc__, formatter=PlainDescriptionFormatter()) |
| 309 parser.add_option('-o', '--output', | |
| 310 help="output relative to this location vs. the manifest location") | |
| 17 | 311 parser.add_option('-d', '--dest', # XXX unused |
| 15 | 312 action='append', |
| 313 help="output only these destinations") | |
| 314 parser.add_option('-s', '--strict', | |
| 315 action='store_true', default=False, | |
| 316 help="fail on error") | |
| 317 parser.add_option('--list-fetchers', dest='list_fetchers', | |
| 318 action='store_true', default=False, | |
| 319 help='list available fetchers and exit') | |
| 320 options, args = parser.parse_args(args) | |
| 0 | 321 |
| 15 | 322 if options.list_fetchers: |
| 17 | 323 types = set() |
| 324 for fetcher in fetchers: | |
| 325 if fetcher.type in types: | |
| 326 continue # occluded, should probably display separately | |
| 327 print '%s : %s' % (fetcher.type, fetcher.doc()) | |
| 328 types.add(fetcher.type) | |
| 15 | 329 parser.exit() |
|
8
cf00d46b1bfb
pretend like we have a pluggable system to start debugging it
Jeff Hammel <jhammel@mozilla.com>
parents:
7
diff
changeset
|
330 |
| 15 | 331 if not args: |
| 17 | 332 # TODO: could read from stdin |
| 15 | 333 parser.print_help() |
| 334 parser.exit() | |
| 0 | 335 |
| 15 | 336 items = read_manifests(*args) |
| 16 | 337 fetch = Fetch(fetchers, strict=options.strict) |
| 0 | 338 |
| 15 | 339 # download the files |
| 340 fetch.fetch(*items) | |
| 0 | 341 |
| 342 if __name__ == '__main__': | |
| 15 | 343 main() |
| 0 | 344 |