Mercurial > hg > fetch
annotate fetch.py @ 42:6e978ddf5135
self._export vs self.export, the function
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Tue, 15 Nov 2011 14:24:51 -0800 |
| parents | e103ae19c2a0 |
| children | 9e6c0f9725e3 |
| 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 |
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28 def __init__(self, url): |
| 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 |
| 0 | 35 |
| 15 | 36 def __call__(self, dest): |
| 17 | 37 raise NotImplementedError("Should be called by implementing class") |
| 38 | |
| 39 @classmethod | |
| 40 def doc(cls): | |
| 41 """return docstring for the instance""" | |
| 42 retval = getattr(cls, '__doc__', '').strip() | |
| 43 return ' '.join(retval.split()) | |
| 0 | 44 |
| 7 | 45 ### standard dispatchers - always available |
| 0 | 46 |
| 7 | 47 import tarfile |
| 0 | 48 import urllib2 |
| 7 | 49 from StringIO import StringIO |
| 0 | 50 |
| 5 | 51 class FileFetcher(Fetcher): |
| 15 | 52 """fetch a single file""" |
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53 # Note: subpath for single files is ignored |
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54 |
| 15 | 55 type = 'file' |
| 0 | 56 |
| 15 | 57 @classmethod |
| 58 def download(cls, url): | |
| 59 return urllib2.urlopen(url).read() | |
| 0 | 60 |
| 15 | 61 def __call__(self, dest): |
| 25 | 62 |
| 15 | 63 if os.path.isdir(dest): |
| 64 filename = self.url.rsplit('/', 1)[-1] | |
| 65 dest = os.path.join(dest, filename) | |
| 66 f = file(dest, 'w') | |
| 67 f.write(self.download(self.url)) | |
| 68 f.close() | |
| 0 | 69 |
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70 |
| 5 | 71 class TarballFetcher(FileFetcher): |
| 15 | 72 """fetch and extract a tarball""" |
| 0 | 73 |
| 15 | 74 type = 'tar' |
| 0 | 75 |
| 15 | 76 def __call__(self, dest): |
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77 if os.path.exists(dest): |
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78 assert os.path.isdir(dest), "Destination must be a directory" |
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79 else: |
| 35 | 80 os.makedirs(dest) |
| 15 | 81 buffer = StringIO() |
| 82 buffer.write(self.download(self.url)) | |
| 83 buffer.seek(0) | |
| 84 tf = tarfile.open(mode='r', fileobj=buffer) | |
| 38 | 85 members = tf.getmembers() |
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86 if self.subpath: |
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87 |
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88 # build list of files to extract |
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89 _members = [] |
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90 |
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91 toppath = None |
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92 for member in members: |
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93 split = member.name.split(os.path.sep) |
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94 if toppath: |
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95 # ensure that for subpaths that only one top level directory exists |
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96 # XXX needed? |
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97 assert toppath == split[0], "Multiple top-level archives found" |
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98 else: |
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99 toppath = split[0] |
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100 if split and split[1:len(self.subpath)+1] == self.subpath: |
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101 member.name = os.path.sep.join(split[1:]) |
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102 _members.append(member) |
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103 |
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104 members = _members |
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105 |
| 38 | 106 for member in members: |
| 107 tf.extract(member, dest) | |
| 7 | 108 |
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109 fetchers = [FileFetcher, TarballFetcher] |
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110 |
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111 ### VCS fetchers |
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112 |
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113 import subprocess |
| 19 | 114 try: |
| 115 from subprocess import check_call as call | |
| 116 except ImportErorr: | |
| 117 raise # we need check_call, kinda | |
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118 |
| 17 | 119 class VCSFetcher(Fetcher): |
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120 |
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121 command = None # name of the VCS command (currently unused) |
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122 |
| 17 | 123 def __init__(self, url, export=True): |
| 124 """ | |
| 125 - export : whether to strip the versioning information | |
| 126 """ | |
| 127 Fetcher.__init__(self, url) | |
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128 self._export = export |
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129 self.prog = self.type # name of app program |
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130 self.vcs_dir = '.' + self.type # subdirectory for version control |
| 17 | 131 |
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132 def call(*args, **kwargs): |
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133 assert command is not None, "Abstract base class" |
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134 call([self.command] + list(args), **kwargs) |
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135 |
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136 def __call__(self, dest): |
| 25 | 137 |
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138 if self.subpath or self._export: |
| 25 | 139 # can only export with a subpath |
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140 self.export(dest, subpath=self.subpath) |
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141 return |
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142 |
| 25 | 143 if os.path.exists(dest): |
| 144 assert os.path.isdir(dest) | |
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145 else: |
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146 self.clone(dest) |
| 25 | 147 |
| 148 def export(self, dest): | |
| 149 """ | |
| 150 export a clone of the directory | |
| 151 """ | |
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152 dest = os.path.abspath(dest) |
| 25 | 153 tmpdir = tempfile.mkdtmp() |
| 154 self.clone(tmpdir) | |
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155 path = tmpdir |
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156 if self.subpath: |
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157 path = os.path.join([tmpdir] + self.subpath) |
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158 assert os.path.exists(path), "subpath %s of %s not found" % (os.path.sep.join(self.subpath), self.url) |
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159 if os.path.isdir(path): |
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160 if os.path.exists(dest): |
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161 assert os.path.isdir(dest), "source is a directory; destination is a file" |
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162 else: |
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163 os.makedirs(dest) |
| 27 | 164 shutil.copytree(path, dest) |
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165 else: |
| 27 | 166 if not os.path.exists(dest): |
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167 directory, filename = os.path.split(dest) |
| 27 | 168 if os.path.exists(directory): |
| 169 assert os.path.isdir(directory), "%s is not a directory" % directory | |
| 170 else: | |
| 171 os.makedirs(directory) | |
| 172 shutil.copy(path, dest) | |
| 25 | 173 shutil.rmtree(tmpdir) |
| 174 | |
| 175 def clone(self, dest): | |
| 176 """ | |
| 177 clones into a directory | |
| 178 """ | |
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179 raise NotImplementedError("Abstract base class") |
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180 |
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181 def update(self, dest): |
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182 """ |
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183 updates a checkout |
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184 """ |
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185 raise NotImplementedError("Abstract base class") |
| 25 | 186 |
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187 def versioned(self, directory): |
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188 return os.path.exists(os.path.join(directory, self.vcs_dir)) |
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189 |
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190 |
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191 if which('hg'): |
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192 |
| 17 | 193 class HgFetcher(VCSFetcher): |
| 15 | 194 """checkout a mercurial repository""" |
| 195 type = 'hg' | |
| 0 | 196 |
| 19 | 197 def __init__(self, url, export=True): |
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198 VCSFetcher.__init__(self, url, export=export) |
| 19 | 199 self.hg = which('hg') |
| 25 | 200 assert self.hg, "'hg' command not found" |
| 19 | 201 |
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202 def clone(self, dest): |
| 23 | 203 if os.path.exists(dest): |
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204 assert os.path.isdir(dest) |
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205 call([self.hg, 'clone', self.url, dest]) |
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206 |
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207 def update(self, dest): |
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208 assert os.path.versioned(dest) |
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209 assert os.path.exists(dest) |
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210 call([self.hg, 'pull', self.url], cwd=dest) |
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211 call([self.hg, 'update', '-C'], cwd=dest) |
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212 |
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213 |
| 15 | 214 fetchers.append(HgFetcher) |
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215 |
| 15 | 216 if which('git'): |
| 17 | 217 |
| 15 | 218 class GitFetcher(Fetcher): |
| 219 """checkout a git repository""" | |
| 220 type = 'git' | |
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221 |
| 20 | 222 def __init__(self, url, export=True): |
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223 VCSFetcher.__init__(self, url, export=export) |
| 23 | 224 self.git = which('git') |
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225 assert self.git, "'git' command not found" |
| 23 | 226 |
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227 def update(self, dest): |
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228 assert os.path.isdir(dest) |
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229 assert os.path.versioned(dest) |
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230 call([self.git, 'pull', self.url], cwd=dest) |
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231 call([self.git, 'update'], cwd=dest) |
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232 |
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233 def clone(self, dest): |
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234 if not os.path.exists(dest): |
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235 os.makedirs(dest) |
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236 call([self.git, 'clone', self.url, dest]) |
| 20 | 237 |
| 238 fetchers.append(GitFetcher) | |
| 17 | 239 |
| 16 | 240 __all__ += [i.__name__ for i in fetchers] |
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241 |
| 0 | 242 class Fetch(object): |
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243 |
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244 def __init__(self, fetchers=fetchers[:], relative_to=None, strict=True, clobber=True): |
| 15 | 245 self.fetchers = fetchers |
| 246 self.relative_to = relative_to | |
| 247 self.strict = strict | |
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248 self._clobber = clobber |
| 0 | 249 |
| 15 | 250 def fetcher(self, _type): |
| 251 """find the fetcher for the appropriate type""" | |
| 252 for fetcher in fetchers: | |
| 253 if fetcher.match(_type): | |
| 254 return fetcher | |
| 0 | 255 |
| 15 | 256 def __call__(self, url, destination, type, **options): |
| 257 fetcher = self.fetcher(type) | |
| 258 assert fetcher is not None, "No fetcher found for type '%s'" % type | |
| 259 fetcher = fetcher(url, **options) | |
| 260 fetcher(destination) | |
| 2 | 261 |
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262 def clobber(self, dest): |
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263 """clobbers if self._clobber is set""" |
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264 if self._clobber and os.path.exists(dest): |
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265 if os.path.isfile(dest): |
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266 os.remove(dest) |
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267 else: |
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268 shutil.rmtree(dest) |
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269 |
| 15 | 270 def fetch(self, *items): |
| 2 | 271 |
| 15 | 272 if self.strict: |
| 273 # ensure all the required fetchers are available | |
| 274 types = set([i['type'] for i in items]) | |
| 275 assert not [i for i in types | |
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276 if not [True for fetcher in fetchers |
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277 if fetcher.match(i)]] |
| 4 | 278 |
| 15 | 279 for item in items: |
| 4 | 280 |
| 15 | 281 # fix up relative paths |
| 282 dest = item['dest'] | |
| 283 if not os.path.isabs(dest): | |
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284 relative_to = self.relative_to |
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285 if not relative_to: |
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286 if isinstance(item['manifest'], basestring): |
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287 relative_to = os.path.dirname(os.path.abspath(item['manifest'])) |
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288 else: |
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289 relative_to = os.getcwd() |
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290 dest = os.path.normpath(os.path.join(relative_to, dest)) |
| 4 | 291 |
| 15 | 292 # fetch the items |
| 293 self(item['url'], destination=dest, type=item['type'], **item['options']) | |
| 0 | 294 |
| 21 | 295 |
| 0 | 296 format_string = "[URL] [destination] [type] <options>" |
| 297 def read_manifests(*manifests): | |
| 15 | 298 """ |
| 299 read some manifests and return the items | |
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300 |
| 15 | 301 Format: |
| 302 %s | |
| 303 """ % format_string | |
| 0 | 304 |
| 15 | 305 retval = [] |
| 0 | 306 |
| 15 | 307 for manifest in manifests: |
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308 if isinstance(manifest, basestring): |
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309 assert os.path.exists(manifest), "manifest '%s' not found" % manifest |
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310 f = file(manifest) |
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311 else: |
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312 f = manifest |
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313 |
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314 for line in f.readlines(): |
| 15 | 315 line = line.strip() |
| 316 if line.startswith('#') or not line: | |
| 317 continue | |
| 318 line = line.split() | |
| 319 if len(line) not in (3,4): | |
| 320 raise Exception("Format should be: %s; line %s" % (format_string, line)) | |
| 321 options = {} | |
| 322 if len(line) == 4: | |
| 323 option_string = line.pop().rstrip(',') | |
| 324 try: | |
| 325 options = dict([[j.strip() for j in i.split('=', 1)] | |
| 326 for i in option_string.split(',')]) | |
| 327 except: | |
| 328 raise Exception("Options format should be: key=value,key2=value2,...; got %s" % option_string) | |
| 0 | 329 |
| 15 | 330 url, dest, _type = line |
| 331 retval.append(dict(url=url, dest=dest, type=_type, options=options, manifest=manifest)) | |
| 332 return retval | |
| 0 | 333 |
| 2 | 334 def main(args=sys.argv[1:]): |
| 0 | 335 |
| 15 | 336 # parse command line options |
| 337 usage = '%prog [options] manifest [manifest] [...]' | |
| 0 | 338 |
| 15 | 339 class PlainDescriptionFormatter(optparse.IndentedHelpFormatter): |
| 340 def format_description(self, description): | |
| 341 if description: | |
| 342 return description + '\n' | |
| 343 else: | |
| 344 return '' | |
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345 |
| 15 | 346 parser = optparse.OptionParser(usage=usage, description=__doc__, formatter=PlainDescriptionFormatter()) |
| 347 parser.add_option('-o', '--output', | |
| 348 help="output relative to this location vs. the manifest location") | |
| 17 | 349 parser.add_option('-d', '--dest', # XXX unused |
| 15 | 350 action='append', |
| 351 help="output only these destinations") | |
| 352 parser.add_option('-s', '--strict', | |
| 353 action='store_true', default=False, | |
| 354 help="fail on error") | |
| 355 parser.add_option('--list-fetchers', dest='list_fetchers', | |
| 356 action='store_true', default=False, | |
| 357 help='list available fetchers and exit') | |
| 358 options, args = parser.parse_args(args) | |
| 0 | 359 |
| 15 | 360 if options.list_fetchers: |
| 17 | 361 types = set() |
| 362 for fetcher in fetchers: | |
| 363 if fetcher.type in types: | |
| 364 continue # occluded, should probably display separately | |
| 365 print '%s : %s' % (fetcher.type, fetcher.doc()) | |
| 366 types.add(fetcher.type) | |
| 15 | 367 parser.exit() |
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368 |
| 15 | 369 if not args: |
| 17 | 370 # TODO: could read from stdin |
| 15 | 371 parser.print_help() |
| 372 parser.exit() | |
| 0 | 373 |
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374 # sanity check |
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375 assert not [i for i in args if not os.path.exists(i)] |
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376 |
| 15 | 377 items = read_manifests(*args) |
| 32 | 378 fetch = Fetch(fetchers, relative_to=options.output, strict=options.strict) |
| 0 | 379 |
| 15 | 380 # download the files |
| 381 fetch.fetch(*items) | |
| 0 | 382 |
| 383 if __name__ == '__main__': | |
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384 main() |
| 0 | 385 |