Mercurial > hg > fetch
annotate fetch.py @ 44:b98c8a8a881b
import tempfile
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Tue, 15 Nov 2011 14:27:23 -0800 |
| parents | 9e6c0f9725e3 |
| children | 87c22bbcda2b |
| rev | line source |
|---|---|
| 0 | 1 #!/usr/bin/env python |
| 2 | |
| 3 """ | |
| 4 fetch stuff from the interwebs | |
| 5 """ | |
| 6 | |
| 44 | 7 import optparse |
| 0 | 8 import os |
| 23 | 9 import shutil |
| 0 | 10 import sys |
| 44 | 11 import tempfile |
| 0 | 12 |
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13 __all__ = ['Fetcher', 'Fetch', 'main'] |
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14 |
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15 def which(executable, path=os.environ['PATH']): |
| 15 | 16 """python equivalent of which; should really be in the stdlib""" |
| 17 dirs = path.split(os.pathsep) | |
| 18 for dir in dirs: | |
| 19 if os.path.isfile(os.path.join(dir, executable)): | |
| 20 return os.path.join(dir, executable) | |
| 7 | 21 |
| 0 | 22 class Fetcher(object): |
| 15 | 23 """abstract base class for resource fetchers""" |
| 0 | 24 |
| 15 | 25 @classmethod |
| 26 def match(cls, _type): | |
| 27 return _type == cls.type | |
| 0 | 28 |
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29 def __init__(self, url): |
| 17 | 30 self.subpath = None |
| 31 if '#' in url: | |
| 32 url, self.subpath = url.rsplit('#') | |
| 25 | 33 if self.subpath: |
| 34 self.subpath = self.subpath.split('/') | |
| 15 | 35 self.url = url |
| 0 | 36 |
| 15 | 37 def __call__(self, dest): |
| 17 | 38 raise NotImplementedError("Should be called by implementing class") |
| 39 | |
| 40 @classmethod | |
| 41 def doc(cls): | |
| 42 """return docstring for the instance""" | |
| 43 retval = getattr(cls, '__doc__', '').strip() | |
| 44 return ' '.join(retval.split()) | |
| 0 | 45 |
| 7 | 46 ### standard dispatchers - always available |
| 0 | 47 |
| 7 | 48 import tarfile |
| 0 | 49 import urllib2 |
| 7 | 50 from StringIO import StringIO |
| 0 | 51 |
| 5 | 52 class FileFetcher(Fetcher): |
| 15 | 53 """fetch a single file""" |
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54 # Note: subpath for single files is ignored |
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55 |
| 15 | 56 type = 'file' |
| 0 | 57 |
| 15 | 58 @classmethod |
| 59 def download(cls, url): | |
| 60 return urllib2.urlopen(url).read() | |
| 0 | 61 |
| 15 | 62 def __call__(self, dest): |
| 25 | 63 |
| 15 | 64 if os.path.isdir(dest): |
| 65 filename = self.url.rsplit('/', 1)[-1] | |
| 66 dest = os.path.join(dest, filename) | |
| 67 f = file(dest, 'w') | |
| 68 f.write(self.download(self.url)) | |
| 69 f.close() | |
| 0 | 70 |
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71 |
| 5 | 72 class TarballFetcher(FileFetcher): |
| 15 | 73 """fetch and extract a tarball""" |
| 0 | 74 |
| 15 | 75 type = 'tar' |
| 0 | 76 |
| 15 | 77 def __call__(self, dest): |
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78 if os.path.exists(dest): |
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79 assert os.path.isdir(dest), "Destination must be a directory" |
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80 else: |
| 35 | 81 os.makedirs(dest) |
| 15 | 82 buffer = StringIO() |
| 83 buffer.write(self.download(self.url)) | |
| 84 buffer.seek(0) | |
| 85 tf = tarfile.open(mode='r', fileobj=buffer) | |
| 38 | 86 members = tf.getmembers() |
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87 if self.subpath: |
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88 |
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89 # build list of files to extract |
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90 _members = [] |
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91 |
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92 toppath = None |
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93 for member in members: |
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94 split = member.name.split(os.path.sep) |
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95 if toppath: |
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96 # ensure that for subpaths that only one top level directory exists |
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97 # XXX needed? |
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98 assert toppath == split[0], "Multiple top-level archives found" |
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99 else: |
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100 toppath = split[0] |
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101 if split and split[1:len(self.subpath)+1] == self.subpath: |
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102 member.name = os.path.sep.join(split[1:]) |
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103 _members.append(member) |
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104 |
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105 members = _members |
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106 |
| 38 | 107 for member in members: |
| 108 tf.extract(member, dest) | |
| 7 | 109 |
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110 fetchers = [FileFetcher, TarballFetcher] |
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111 |
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112 ### VCS fetchers |
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113 |
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114 import subprocess |
| 19 | 115 try: |
| 116 from subprocess import check_call as call | |
| 117 except ImportErorr: | |
| 118 raise # we need check_call, kinda | |
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119 |
| 17 | 120 class VCSFetcher(Fetcher): |
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121 |
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122 command = None # name of the VCS command (currently unused) |
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123 |
| 17 | 124 def __init__(self, url, export=True): |
| 125 """ | |
| 126 - export : whether to strip the versioning information | |
| 127 """ | |
| 128 Fetcher.__init__(self, url) | |
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129 self._export = export |
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130 self.prog = self.type # name of app program |
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131 self.vcs_dir = '.' + self.type # subdirectory for version control |
| 17 | 132 |
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133 def call(*args, **kwargs): |
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134 assert command is not None, "Abstract base class" |
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135 call([self.command] + list(args), **kwargs) |
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136 |
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137 def __call__(self, dest): |
| 25 | 138 |
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139 if self.subpath or self._export: |
| 25 | 140 # can only export with a subpath |
| 43 | 141 self.export(dest) |
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142 return |
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143 |
| 25 | 144 if os.path.exists(dest): |
| 145 assert os.path.isdir(dest) | |
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146 else: |
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147 self.clone(dest) |
| 25 | 148 |
| 149 def export(self, dest): | |
| 150 """ | |
| 151 export a clone of the directory | |
| 152 """ | |
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153 dest = os.path.abspath(dest) |
| 25 | 154 tmpdir = tempfile.mkdtmp() |
| 155 self.clone(tmpdir) | |
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156 path = tmpdir |
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157 if self.subpath: |
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158 path = os.path.join([tmpdir] + self.subpath) |
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159 assert os.path.exists(path), "subpath %s of %s not found" % (os.path.sep.join(self.subpath), self.url) |
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160 if os.path.isdir(path): |
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161 if os.path.exists(dest): |
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162 assert os.path.isdir(dest), "source is a directory; destination is a file" |
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163 else: |
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164 os.makedirs(dest) |
| 27 | 165 shutil.copytree(path, dest) |
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166 else: |
| 27 | 167 if not os.path.exists(dest): |
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168 directory, filename = os.path.split(dest) |
| 27 | 169 if os.path.exists(directory): |
| 170 assert os.path.isdir(directory), "%s is not a directory" % directory | |
| 171 else: | |
| 172 os.makedirs(directory) | |
| 173 shutil.copy(path, dest) | |
| 25 | 174 shutil.rmtree(tmpdir) |
| 175 | |
| 176 def clone(self, dest): | |
| 177 """ | |
| 178 clones into a directory | |
| 179 """ | |
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180 raise NotImplementedError("Abstract base class") |
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181 |
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182 def update(self, dest): |
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183 """ |
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184 updates a checkout |
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185 """ |
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186 raise NotImplementedError("Abstract base class") |
| 25 | 187 |
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188 def versioned(self, directory): |
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189 return os.path.exists(os.path.join(directory, self.vcs_dir)) |
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190 |
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191 |
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192 if which('hg'): |
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193 |
| 17 | 194 class HgFetcher(VCSFetcher): |
| 15 | 195 """checkout a mercurial repository""" |
| 196 type = 'hg' | |
| 0 | 197 |
| 19 | 198 def __init__(self, url, export=True): |
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199 VCSFetcher.__init__(self, url, export=export) |
| 19 | 200 self.hg = which('hg') |
| 25 | 201 assert self.hg, "'hg' command not found" |
| 19 | 202 |
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203 def clone(self, dest): |
| 23 | 204 if os.path.exists(dest): |
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205 assert os.path.isdir(dest) |
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206 call([self.hg, 'clone', self.url, dest]) |
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207 |
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208 def update(self, dest): |
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209 assert os.path.versioned(dest) |
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210 assert os.path.exists(dest) |
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211 call([self.hg, 'pull', self.url], cwd=dest) |
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212 call([self.hg, 'update', '-C'], cwd=dest) |
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213 |
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214 |
| 15 | 215 fetchers.append(HgFetcher) |
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216 |
| 15 | 217 if which('git'): |
| 17 | 218 |
| 15 | 219 class GitFetcher(Fetcher): |
| 220 """checkout a git repository""" | |
| 221 type = 'git' | |
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222 |
| 20 | 223 def __init__(self, url, export=True): |
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224 VCSFetcher.__init__(self, url, export=export) |
| 23 | 225 self.git = which('git') |
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226 assert self.git, "'git' command not found" |
| 23 | 227 |
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228 def update(self, dest): |
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229 assert os.path.isdir(dest) |
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230 assert os.path.versioned(dest) |
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231 call([self.git, 'pull', self.url], cwd=dest) |
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232 call([self.git, 'update'], cwd=dest) |
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233 |
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234 def clone(self, dest): |
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235 if not os.path.exists(dest): |
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236 os.makedirs(dest) |
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237 call([self.git, 'clone', self.url, dest]) |
| 20 | 238 |
| 239 fetchers.append(GitFetcher) | |
| 17 | 240 |
| 16 | 241 __all__ += [i.__name__ for i in fetchers] |
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242 |
| 0 | 243 class Fetch(object): |
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244 |
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245 def __init__(self, fetchers=fetchers[:], relative_to=None, strict=True, clobber=True): |
| 15 | 246 self.fetchers = fetchers |
| 247 self.relative_to = relative_to | |
| 248 self.strict = strict | |
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249 self._clobber = clobber |
| 0 | 250 |
| 15 | 251 def fetcher(self, _type): |
| 252 """find the fetcher for the appropriate type""" | |
| 253 for fetcher in fetchers: | |
| 254 if fetcher.match(_type): | |
| 255 return fetcher | |
| 0 | 256 |
| 15 | 257 def __call__(self, url, destination, type, **options): |
| 258 fetcher = self.fetcher(type) | |
| 259 assert fetcher is not None, "No fetcher found for type '%s'" % type | |
| 260 fetcher = fetcher(url, **options) | |
| 261 fetcher(destination) | |
| 2 | 262 |
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263 def clobber(self, dest): |
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264 """clobbers if self._clobber is set""" |
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265 if self._clobber and os.path.exists(dest): |
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266 if os.path.isfile(dest): |
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267 os.remove(dest) |
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268 else: |
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269 shutil.rmtree(dest) |
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270 |
| 15 | 271 def fetch(self, *items): |
| 2 | 272 |
| 15 | 273 if self.strict: |
| 274 # ensure all the required fetchers are available | |
| 275 types = set([i['type'] for i in items]) | |
| 276 assert not [i for i in types | |
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277 if not [True for fetcher in fetchers |
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278 if fetcher.match(i)]] |
| 4 | 279 |
| 15 | 280 for item in items: |
| 4 | 281 |
| 15 | 282 # fix up relative paths |
| 283 dest = item['dest'] | |
| 284 if not os.path.isabs(dest): | |
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285 relative_to = self.relative_to |
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286 if not relative_to: |
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287 if isinstance(item['manifest'], basestring): |
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288 relative_to = os.path.dirname(os.path.abspath(item['manifest'])) |
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289 else: |
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290 relative_to = os.getcwd() |
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291 dest = os.path.normpath(os.path.join(relative_to, dest)) |
| 4 | 292 |
| 15 | 293 # fetch the items |
| 294 self(item['url'], destination=dest, type=item['type'], **item['options']) | |
| 0 | 295 |
| 21 | 296 |
| 0 | 297 format_string = "[URL] [destination] [type] <options>" |
| 298 def read_manifests(*manifests): | |
| 15 | 299 """ |
| 300 read some manifests and return the items | |
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301 |
| 15 | 302 Format: |
| 303 %s | |
| 304 """ % format_string | |
| 0 | 305 |
| 15 | 306 retval = [] |
| 0 | 307 |
| 15 | 308 for manifest in manifests: |
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309 if isinstance(manifest, basestring): |
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310 assert os.path.exists(manifest), "manifest '%s' not found" % manifest |
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311 f = file(manifest) |
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312 else: |
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313 f = manifest |
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314 |
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315 for line in f.readlines(): |
| 15 | 316 line = line.strip() |
| 317 if line.startswith('#') or not line: | |
| 318 continue | |
| 319 line = line.split() | |
| 320 if len(line) not in (3,4): | |
| 321 raise Exception("Format should be: %s; line %s" % (format_string, line)) | |
| 322 options = {} | |
| 323 if len(line) == 4: | |
| 324 option_string = line.pop().rstrip(',') | |
| 325 try: | |
| 326 options = dict([[j.strip() for j in i.split('=', 1)] | |
| 327 for i in option_string.split(',')]) | |
| 328 except: | |
| 329 raise Exception("Options format should be: key=value,key2=value2,...; got %s" % option_string) | |
| 0 | 330 |
| 15 | 331 url, dest, _type = line |
| 332 retval.append(dict(url=url, dest=dest, type=_type, options=options, manifest=manifest)) | |
| 333 return retval | |
| 0 | 334 |
| 2 | 335 def main(args=sys.argv[1:]): |
| 0 | 336 |
| 15 | 337 # parse command line options |
| 338 usage = '%prog [options] manifest [manifest] [...]' | |
| 0 | 339 |
| 15 | 340 class PlainDescriptionFormatter(optparse.IndentedHelpFormatter): |
| 341 def format_description(self, description): | |
| 342 if description: | |
| 343 return description + '\n' | |
| 344 else: | |
| 345 return '' | |
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346 |
| 15 | 347 parser = optparse.OptionParser(usage=usage, description=__doc__, formatter=PlainDescriptionFormatter()) |
| 348 parser.add_option('-o', '--output', | |
| 349 help="output relative to this location vs. the manifest location") | |
| 17 | 350 parser.add_option('-d', '--dest', # XXX unused |
| 15 | 351 action='append', |
| 352 help="output only these destinations") | |
| 353 parser.add_option('-s', '--strict', | |
| 354 action='store_true', default=False, | |
| 355 help="fail on error") | |
| 356 parser.add_option('--list-fetchers', dest='list_fetchers', | |
| 357 action='store_true', default=False, | |
| 358 help='list available fetchers and exit') | |
| 359 options, args = parser.parse_args(args) | |
| 0 | 360 |
| 15 | 361 if options.list_fetchers: |
| 17 | 362 types = set() |
| 363 for fetcher in fetchers: | |
| 364 if fetcher.type in types: | |
| 365 continue # occluded, should probably display separately | |
| 366 print '%s : %s' % (fetcher.type, fetcher.doc()) | |
| 367 types.add(fetcher.type) | |
| 15 | 368 parser.exit() |
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369 |
| 15 | 370 if not args: |
| 17 | 371 # TODO: could read from stdin |
| 15 | 372 parser.print_help() |
| 373 parser.exit() | |
| 0 | 374 |
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375 # sanity check |
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376 assert not [i for i in args if not os.path.exists(i)] |
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377 |
| 15 | 378 items = read_manifests(*args) |
| 32 | 379 fetch = Fetch(fetchers, relative_to=options.output, strict=options.strict) |
| 0 | 380 |
| 15 | 381 # download the files |
| 382 fetch.fetch(*items) | |
| 0 | 383 |
| 384 if __name__ == '__main__': | |
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385 main() |
| 0 | 386 |