Mercurial > hg > fetch
annotate fetch.py @ 31:60e0e932570e
fix one error but not the one i was aiming for
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Tue, 15 Nov 2011 11:45:46 -0800 |
| parents | 1c963875e6cd |
| children | 46d5bd33311d |
| rev | line source |
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| 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 |
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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 self.clobber() |
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87 if os.path.exists(dest): |
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88 assert os.path.isdir(dest), "Destination must be a directory" |
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89 else: |
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90 os.mkdirs(dest) |
| 17 | 91 if self.subpath: |
| 92 raise NotImplementedError("should extract only a subpath of a tarball but I haven't finished it yet") | |
| 15 | 93 buffer = StringIO() |
| 94 buffer.write(self.download(self.url)) | |
| 95 buffer.seek(0) | |
| 96 tf = tarfile.open(mode='r', fileobj=buffer) | |
| 97 tf.extract(dest) | |
| 7 | 98 |
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99 fetchers = [FileFetcher, TarballFetcher] |
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100 |
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101 ### VCS fetchers |
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102 |
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103 import subprocess |
| 19 | 104 try: |
| 105 from subprocess import check_call as call | |
| 106 except ImportErorr: | |
| 107 raise # we need check_call, kinda | |
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108 |
| 17 | 109 class VCSFetcher(Fetcher): |
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110 |
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111 command = None |
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112 |
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113 def call(*args, **kwargs): |
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114 assert command is not None, "Abstract base class" |
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115 call([self.command] + list(args), **kwargs) |
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116 |
| 17 | 117 def __init__(self, url, export=True): |
| 118 """ | |
| 119 - export : whether to strip the versioning information | |
| 120 """ | |
| 121 Fetcher.__init__(self, url) | |
| 122 self.export = export | |
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123 self.prog = self.type # name of app program |
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124 self.vcs_dir = '.' + self.type # subdirectory for version control |
| 17 | 125 |
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126 def __call__(self, dest): |
| 25 | 127 |
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128 self.clobber(dest) |
| 25 | 129 if self.subpath or self.export: |
| 130 # can only export with a subpath | |
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131 self.export(dest, subpath=self.subpath) |
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132 return |
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133 |
| 25 | 134 if os.path.exists(dest): |
| 135 assert os.path.isdir(dest) | |
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136 else: |
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137 self.clone(dest) |
| 25 | 138 |
| 139 def export(self, dest): | |
| 140 """ | |
| 141 export a clone of the directory | |
| 142 """ | |
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143 dest = os.path.abspath(dest) |
| 25 | 144 tmpdir = tempfile.mkdtmp() |
| 145 self.clone(tmpdir) | |
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146 path = tmpdir |
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147 if self.subpath: |
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148 path = os.path.join([tmpdir] + self.subpath) |
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149 assert os.path.exists(path), "subpath %s of %s not found" % (os.path.sep.join(self.subpath), self.url) |
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150 self.clobber(dest) |
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151 if os.path.isdir(path): |
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152 if os.path.exists(dest): |
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153 assert os.path.isdir(dest), "source is a directory; destination is a file" |
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154 else: |
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155 os.makedirs(dest) |
| 27 | 156 shutil.copytree(path, dest) |
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157 else: |
| 27 | 158 if not os.path.exists(dest): |
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159 directory, filename = os.path.split(dest) |
| 27 | 160 if os.path.exists(directory): |
| 161 assert os.path.isdir(directory), "%s is not a directory" % directory | |
| 162 else: | |
| 163 os.makedirs(directory) | |
| 164 shutil.copy(path, dest) | |
| 25 | 165 shutil.rmtree(tmpdir) |
| 166 | |
| 167 def clone(self, dest): | |
| 168 """ | |
| 169 clones into a directory | |
| 170 """ | |
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171 raise NotImplementedError("Abstract base class") |
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172 |
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173 def update(self, dest): |
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174 """ |
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175 updates a checkout |
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176 """ |
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177 raise NotImplementedError("Abstract base class") |
| 25 | 178 |
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179 def versioned(self, directory): |
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180 return os.path.exists(os.path.join(directory, self.vcs_dir)) |
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181 |
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182 |
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183 if which('hg'): |
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184 |
| 17 | 185 class HgFetcher(VCSFetcher): |
| 15 | 186 """checkout a mercurial repository""" |
| 187 type = 'hg' | |
| 0 | 188 |
| 19 | 189 def __init__(self, url, export=True): |
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190 VCSFetcher.__init__(self, url, export=export) |
| 19 | 191 self.hg = which('hg') |
| 25 | 192 assert self.hg, "'hg' command not found" |
| 19 | 193 |
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194 def clone(self, dest): |
| 23 | 195 if os.path.exists(dest): |
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196 assert os.path.isdir(dest) |
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197 call([self.hg, 'clone', self.url, dest]) |
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198 |
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199 def update(self, dest): |
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200 assert os.path.versioned(dest) |
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201 assert os.path.exists(dest) |
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202 call([self.hg, 'pull', self.url], cwd=dest) |
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203 call([self.hg, 'update', '-C'], cwd=dest) |
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204 |
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205 |
| 15 | 206 fetchers.append(HgFetcher) |
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207 |
| 15 | 208 if which('git'): |
| 17 | 209 |
| 15 | 210 class GitFetcher(Fetcher): |
| 211 """checkout a git repository""" | |
| 212 type = 'git' | |
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213 |
| 20 | 214 def __init__(self, url, export=True): |
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215 VCSFetcher.__init__(self, url, export=export) |
| 23 | 216 self.git = which('git') |
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217 assert self.git, "'git' command not found" |
| 23 | 218 |
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219 def update(self, dest): |
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220 assert os.path.isdir(dest) |
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221 assert os.path.versioned(dest) |
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222 call([self.git, 'pull', self.url], cwd=dest) |
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223 call([self.git, 'update'], cwd=dest) |
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224 |
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225 def clone(self, dest): |
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226 if not os.path.exists(dest): |
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227 os.makedirs(dest) |
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228 call([self.git, 'clone', self.url, dest]) |
| 20 | 229 |
| 230 fetchers.append(GitFetcher) | |
| 17 | 231 |
| 16 | 232 __all__ += [i.__name__ for i in fetchers] |
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233 |
| 0 | 234 class Fetch(object): |
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235 |
| 21 | 236 def __init__(self, fetchers=fetchers[:], relative_to=None, strict=True): |
| 15 | 237 self.fetchers = fetchers |
| 238 self.relative_to = relative_to | |
| 239 self.strict = strict | |
| 0 | 240 |
| 15 | 241 def fetcher(self, _type): |
| 242 """find the fetcher for the appropriate type""" | |
| 243 for fetcher in fetchers: | |
| 244 if fetcher.match(_type): | |
| 245 return fetcher | |
| 0 | 246 |
| 15 | 247 def __call__(self, url, destination, type, **options): |
| 248 fetcher = self.fetcher(type) | |
| 249 assert fetcher is not None, "No fetcher found for type '%s'" % type | |
| 250 fetcher = fetcher(url, **options) | |
| 251 fetcher(destination) | |
| 2 | 252 |
| 15 | 253 def fetch(self, *items): |
| 2 | 254 |
| 15 | 255 if self.strict: |
| 256 # ensure all the required fetchers are available | |
| 257 types = set([i['type'] for i in items]) | |
| 258 assert not [i for i in types | |
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259 if not [True for fetcher in fetchers |
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260 if fetcher.match(i)]] |
| 4 | 261 |
| 15 | 262 for item in items: |
| 4 | 263 |
| 15 | 264 # fix up relative paths |
| 265 dest = item['dest'] | |
| 266 if not os.path.isabs(dest): | |
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267 relative_to = self.relative_to |
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268 if not relative_to: |
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269 if isinstance(item['manifest'], basestring): |
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270 relative_to = os.path.dirname(os.path.abspath(item['manifest'])) |
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271 else: |
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272 relative_to = os.getcwd() |
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273 dest = os.path.normpath(os.path.join(relative_to, dest)) |
| 4 | 274 |
| 15 | 275 # fetch the items |
| 276 self(item['url'], destination=dest, type=item['type'], **item['options']) | |
| 0 | 277 |
| 21 | 278 |
| 0 | 279 format_string = "[URL] [destination] [type] <options>" |
| 280 def read_manifests(*manifests): | |
| 15 | 281 """ |
| 282 read some manifests and return the items | |
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283 |
| 15 | 284 Format: |
| 285 %s | |
| 286 """ % format_string | |
| 0 | 287 |
| 15 | 288 retval = [] |
| 0 | 289 |
| 15 | 290 for manifest in manifests: |
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291 if isinstance(manifest, basestring): |
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292 assert os.path.exists(manifest), "manifest '%s' not found" % manifest |
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293 f = file(manifest) |
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294 else: |
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295 f = manifest |
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296 |
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297 for line in f.readlines(): |
| 15 | 298 line = line.strip() |
| 299 if line.startswith('#') or not line: | |
| 300 continue | |
| 301 line = line.split() | |
| 302 if len(line) not in (3,4): | |
| 303 raise Exception("Format should be: %s; line %s" % (format_string, line)) | |
| 304 options = {} | |
| 305 if len(line) == 4: | |
| 306 option_string = line.pop().rstrip(',') | |
| 307 try: | |
| 308 options = dict([[j.strip() for j in i.split('=', 1)] | |
| 309 for i in option_string.split(',')]) | |
| 310 except: | |
| 311 raise Exception("Options format should be: key=value,key2=value2,...; got %s" % option_string) | |
| 0 | 312 |
| 15 | 313 url, dest, _type = line |
| 314 retval.append(dict(url=url, dest=dest, type=_type, options=options, manifest=manifest)) | |
| 315 return retval | |
| 0 | 316 |
| 2 | 317 def main(args=sys.argv[1:]): |
| 0 | 318 |
| 15 | 319 # parse command line options |
| 320 usage = '%prog [options] manifest [manifest] [...]' | |
| 0 | 321 |
| 15 | 322 class PlainDescriptionFormatter(optparse.IndentedHelpFormatter): |
| 323 def format_description(self, description): | |
| 324 if description: | |
| 325 return description + '\n' | |
| 326 else: | |
| 327 return '' | |
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328 |
| 15 | 329 parser = optparse.OptionParser(usage=usage, description=__doc__, formatter=PlainDescriptionFormatter()) |
| 330 parser.add_option('-o', '--output', | |
| 331 help="output relative to this location vs. the manifest location") | |
| 17 | 332 parser.add_option('-d', '--dest', # XXX unused |
| 15 | 333 action='append', |
| 334 help="output only these destinations") | |
| 335 parser.add_option('-s', '--strict', | |
| 336 action='store_true', default=False, | |
| 337 help="fail on error") | |
| 338 parser.add_option('--list-fetchers', dest='list_fetchers', | |
| 339 action='store_true', default=False, | |
| 340 help='list available fetchers and exit') | |
| 341 options, args = parser.parse_args(args) | |
| 0 | 342 |
| 15 | 343 if options.list_fetchers: |
| 17 | 344 types = set() |
| 345 for fetcher in fetchers: | |
| 346 if fetcher.type in types: | |
| 347 continue # occluded, should probably display separately | |
| 348 print '%s : %s' % (fetcher.type, fetcher.doc()) | |
| 349 types.add(fetcher.type) | |
| 15 | 350 parser.exit() |
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351 |
| 15 | 352 if not args: |
| 17 | 353 # TODO: could read from stdin |
| 15 | 354 parser.print_help() |
| 355 parser.exit() | |
| 0 | 356 |
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357 # sanity check |
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358 assert not [i for i in args if not os.path.exists(i)] |
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359 |
| 15 | 360 items = read_manifests(*args) |
| 16 | 361 fetch = Fetch(fetchers, strict=options.strict) |
| 0 | 362 |
| 15 | 363 # download the files |
| 364 fetch.fetch(*items) | |
| 0 | 365 |
| 366 if __name__ == '__main__': | |
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367 main() |
| 0 | 368 |