Mercurial > hg > fetch
annotate fetch.py @ 54:c62e80b8615a
account for paths that do not exit for the FileFetcher
| author | Jeff Hammel <jhammel@mozilla.com> |
|---|---|
| date | Tue, 15 Nov 2011 16:20:01 -0800 |
| parents | 81fe0523a078 |
| children |
| 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 |
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22 def copytree(src, dst): |
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23 """ |
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24 replacement for shutil.copytree because of this nonsense from help(shutil.copytree): |
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25 "The destination directory must not already exist." |
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26 """ |
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27 |
| 47 | 28 assert os.path.exists(src), "'%s' does not exist" % src |
| 29 | |
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30 # if its a file, just copy it |
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31 if os.path.isfile(src): |
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32 shutil.copy2(src, dst) |
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33 return |
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34 |
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35 # otherwise a directory |
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36 assert os.path.isdir(src) |
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37 if os.path.exists(dst): |
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38 assert os.path.isdir(dst), "%s is a file, %s is a directory" % (src, dst) |
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39 else: |
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40 os.makedirs(dst) |
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41 |
| 47 | 42 src = os.path.realpath(src) |
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43 for dirpath, dirnames, filenames in os.walk(src): |
| 47 | 44 for d in dirnames: |
| 48 | 45 path = os.path.join(dirpath, d) |
| 46 _dst = os.path.join(dst, os.path.relpath(path, src)) # XXX depends on python 2.5 relpath | |
| 47 if os.path.exists(_dst): | |
| 48 assert os.path.isdir(_dst), "%s is a file, %s is a directory" % (src, dst) | |
| 49 else: | |
| 50 os.makedirs(_dst) | |
| 47 | 51 for f in filenames: |
| 52 path = os.path.join(dirpath, f) | |
| 48 | 53 _dst = os.path.join(dst, os.path.relpath(path, src)) # XXX depends on python 2.5 relpath |
| 54 shutil.copy2(path, _dst) | |
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55 |
| 0 | 56 class Fetcher(object): |
| 15 | 57 """abstract base class for resource fetchers""" |
| 0 | 58 |
| 15 | 59 @classmethod |
| 60 def match(cls, _type): | |
| 61 return _type == cls.type | |
| 0 | 62 |
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63 def __init__(self, url): |
| 17 | 64 self.subpath = None |
| 65 if '#' in url: | |
| 66 url, self.subpath = url.rsplit('#') | |
| 25 | 67 if self.subpath: |
| 68 self.subpath = self.subpath.split('/') | |
| 15 | 69 self.url = url |
| 0 | 70 |
| 15 | 71 def __call__(self, dest): |
| 17 | 72 raise NotImplementedError("Should be called by implementing class") |
| 73 | |
| 74 @classmethod | |
| 75 def doc(cls): | |
| 76 """return docstring for the instance""" | |
| 77 retval = getattr(cls, '__doc__', '').strip() | |
| 78 return ' '.join(retval.split()) | |
| 0 | 79 |
| 7 | 80 ### standard dispatchers - always available |
| 0 | 81 |
| 7 | 82 import tarfile |
| 0 | 83 import urllib2 |
| 7 | 84 from StringIO import StringIO |
| 0 | 85 |
| 5 | 86 class FileFetcher(Fetcher): |
| 15 | 87 """fetch a single file""" |
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88 # Note: subpath for single files is ignored |
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89 |
| 15 | 90 type = 'file' |
| 0 | 91 |
| 15 | 92 @classmethod |
| 93 def download(cls, url): | |
| 94 return urllib2.urlopen(url).read() | |
| 0 | 95 |
| 15 | 96 def __call__(self, dest): |
| 25 | 97 |
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98 dirname = os.path.dirname(dest) |
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99 if not os.path.exists(dirname): |
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100 os.makedirs(dirname) |
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101 |
| 15 | 102 if os.path.isdir(dest): |
| 103 filename = self.url.rsplit('/', 1)[-1] | |
| 104 dest = os.path.join(dest, filename) | |
| 105 f = file(dest, 'w') | |
| 106 f.write(self.download(self.url)) | |
| 107 f.close() | |
| 0 | 108 |
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109 |
| 5 | 110 class TarballFetcher(FileFetcher): |
| 15 | 111 """fetch and extract a tarball""" |
| 0 | 112 |
| 15 | 113 type = 'tar' |
| 0 | 114 |
| 15 | 115 def __call__(self, dest): |
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116 if os.path.exists(dest): |
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117 assert os.path.isdir(dest), "Destination must be a directory" |
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118 else: |
| 35 | 119 os.makedirs(dest) |
| 15 | 120 buffer = StringIO() |
| 121 buffer.write(self.download(self.url)) | |
| 122 buffer.seek(0) | |
| 123 tf = tarfile.open(mode='r', fileobj=buffer) | |
| 38 | 124 members = tf.getmembers() |
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125 if self.subpath: |
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126 |
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127 # build list of files to extract |
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128 _members = [] |
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129 |
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130 toppath = None |
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131 for member in members: |
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132 split = member.name.split(os.path.sep) |
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133 if toppath: |
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134 # ensure that for subpaths that only one top level directory exists |
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135 # XXX needed? |
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136 assert toppath == split[0], "Multiple top-level archives found" |
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137 else: |
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138 toppath = split[0] |
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139 if split and split[1:len(self.subpath)+1] == self.subpath: |
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140 member.name = os.path.sep.join(split[1:]) |
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141 _members.append(member) |
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142 |
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143 members = _members |
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144 |
| 38 | 145 for member in members: |
| 146 tf.extract(member, dest) | |
| 7 | 147 |
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148 fetchers = [FileFetcher, TarballFetcher] |
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149 |
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150 ### VCS fetchers |
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151 |
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152 import subprocess |
| 19 | 153 try: |
| 154 from subprocess import check_call as call | |
| 155 except ImportErorr: | |
| 156 raise # we need check_call, kinda | |
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157 |
| 17 | 158 class VCSFetcher(Fetcher): |
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159 |
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160 command = None # name of the VCS command (currently unused) |
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161 |
| 17 | 162 def __init__(self, url, export=True): |
| 163 """ | |
| 164 - export : whether to strip the versioning information | |
| 165 """ | |
| 166 Fetcher.__init__(self, url) | |
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167 self._export = export |
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168 self.prog = self.type # name of app program |
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169 self.vcs_dir = '.' + self.type # subdirectory for version control |
| 17 | 170 |
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171 def call(*args, **kwargs): |
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172 assert command is not None, "Abstract base class" |
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173 call([self.command] + list(args), **kwargs) |
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174 |
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175 def __call__(self, dest): |
| 25 | 176 |
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177 if self.subpath or self._export: |
| 25 | 178 # can only export with a subpath |
| 43 | 179 self.export(dest) |
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180 return |
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181 |
| 25 | 182 if os.path.exists(dest): |
| 183 assert os.path.isdir(dest) | |
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184 else: |
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185 self.clone(dest) |
| 25 | 186 |
| 187 def export(self, dest): | |
| 188 """ | |
| 189 export a clone of the directory | |
| 190 """ | |
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191 dest = os.path.abspath(dest) |
| 45 | 192 tmpdir = tempfile.mkdtemp() |
| 25 | 193 self.clone(tmpdir) |
| 47 | 194 if self.vcs_dir: |
| 195 shutil.rmtree(os.path.join(tmpdir, self.vcs_dir)) | |
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196 path = tmpdir |
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197 if self.subpath: |
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198 path = os.path.join(*([tmpdir] + self.subpath)) |
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199 assert os.path.exists(path), "subpath %s of %s not found" % (os.path.sep.join(self.subpath), self.url) |
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200 if os.path.isdir(path): |
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201 if os.path.exists(dest): |
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202 assert os.path.isdir(dest), "source is a directory; destination is a file" |
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203 else: |
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204 os.makedirs(dest) |
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205 copytree(path, dest) |
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206 else: |
| 27 | 207 if not os.path.exists(dest): |
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208 directory, filename = os.path.split(dest) |
| 27 | 209 if os.path.exists(directory): |
| 210 assert os.path.isdir(directory), "%s is not a directory" % directory | |
| 211 else: | |
| 212 os.makedirs(directory) | |
| 213 shutil.copy(path, dest) | |
| 25 | 214 shutil.rmtree(tmpdir) |
| 215 | |
| 216 def clone(self, dest): | |
| 217 """ | |
| 218 clones into a directory | |
| 219 """ | |
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220 raise NotImplementedError("Abstract base class") |
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221 |
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222 def update(self, dest): |
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223 """ |
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224 updates a checkout |
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225 """ |
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226 raise NotImplementedError("Abstract base class") |
| 25 | 227 |
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228 def versioned(self, directory): |
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229 return os.path.exists(os.path.join(directory, self.vcs_dir)) |
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230 |
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231 |
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232 if which('hg'): |
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233 |
| 17 | 234 class HgFetcher(VCSFetcher): |
| 15 | 235 """checkout a mercurial repository""" |
| 236 type = 'hg' | |
| 0 | 237 |
| 19 | 238 def __init__(self, url, export=True): |
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239 VCSFetcher.__init__(self, url, export=export) |
| 19 | 240 self.hg = which('hg') |
| 25 | 241 assert self.hg, "'hg' command not found" |
| 19 | 242 |
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243 def clone(self, dest): |
| 23 | 244 if os.path.exists(dest): |
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245 assert os.path.isdir(dest) |
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246 call([self.hg, 'clone', self.url, dest]) |
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247 |
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248 def update(self, dest): |
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249 assert os.path.versioned(dest) |
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250 assert os.path.exists(dest) |
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251 call([self.hg, 'pull', self.url], cwd=dest) |
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252 call([self.hg, 'update', '-C'], cwd=dest) |
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253 |
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254 |
| 15 | 255 fetchers.append(HgFetcher) |
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256 |
| 15 | 257 if which('git'): |
| 17 | 258 |
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259 class GitFetcher(VCSFetcher): |
| 15 | 260 """checkout a git repository""" |
| 261 type = 'git' | |
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262 |
| 20 | 263 def __init__(self, url, export=True): |
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264 VCSFetcher.__init__(self, url, export=export) |
| 23 | 265 self.git = which('git') |
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266 assert self.git, "'git' command not found" |
| 23 | 267 |
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268 def update(self, dest): |
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269 assert os.path.isdir(dest) |
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270 assert os.path.versioned(dest) |
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271 call([self.git, 'pull', self.url], cwd=dest) |
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272 call([self.git, 'update'], cwd=dest) |
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273 |
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274 def clone(self, dest): |
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275 if not os.path.exists(dest): |
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276 os.makedirs(dest) |
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277 call([self.git, 'clone', self.url, dest]) |
| 20 | 278 |
| 279 fetchers.append(GitFetcher) | |
| 17 | 280 |
| 16 | 281 __all__ += [i.__name__ for i in fetchers] |
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282 |
| 0 | 283 class Fetch(object): |
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284 |
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285 def __init__(self, fetchers=fetchers[:], relative_to=None, strict=True, clobber=True): |
| 15 | 286 self.fetchers = fetchers |
| 287 self.relative_to = relative_to | |
| 288 self.strict = strict | |
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289 self._clobber = clobber |
| 0 | 290 |
| 15 | 291 def fetcher(self, _type): |
| 292 """find the fetcher for the appropriate type""" | |
| 293 for fetcher in fetchers: | |
| 294 if fetcher.match(_type): | |
| 295 return fetcher | |
| 0 | 296 |
| 15 | 297 def __call__(self, url, destination, type, **options): |
| 298 fetcher = self.fetcher(type) | |
| 299 assert fetcher is not None, "No fetcher found for type '%s'" % type | |
| 300 fetcher = fetcher(url, **options) | |
| 301 fetcher(destination) | |
| 2 | 302 |
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303 def clobber(self, dest): |
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304 """clobbers if self._clobber is set""" |
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305 if self._clobber and os.path.exists(dest): |
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306 if os.path.isfile(dest): |
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307 os.remove(dest) |
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308 else: |
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309 shutil.rmtree(dest) |
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310 |
| 15 | 311 def fetch(self, *items): |
| 2 | 312 |
| 15 | 313 if self.strict: |
| 314 # ensure all the required fetchers are available | |
| 315 types = set([i['type'] for i in items]) | |
| 316 assert not [i for i in types | |
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317 if not [True for fetcher in fetchers |
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318 if fetcher.match(i)]] |
| 4 | 319 |
| 15 | 320 for item in items: |
| 4 | 321 |
| 15 | 322 # fix up relative paths |
| 323 dest = item['dest'] | |
| 324 if not os.path.isabs(dest): | |
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325 relative_to = self.relative_to |
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326 if not relative_to: |
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327 if isinstance(item['manifest'], basestring): |
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328 relative_to = os.path.dirname(os.path.abspath(item['manifest'])) |
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329 else: |
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330 relative_to = os.getcwd() |
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331 dest = os.path.normpath(os.path.join(relative_to, dest)) |
| 4 | 332 |
| 15 | 333 # fetch the items |
| 334 self(item['url'], destination=dest, type=item['type'], **item['options']) | |
| 0 | 335 |
| 21 | 336 |
| 0 | 337 format_string = "[URL] [destination] [type] <options>" |
| 338 def read_manifests(*manifests): | |
| 15 | 339 """ |
| 340 read some manifests and return the items | |
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341 |
| 15 | 342 Format: |
| 343 %s | |
| 344 """ % format_string | |
| 0 | 345 |
| 15 | 346 retval = [] |
| 0 | 347 |
| 15 | 348 for manifest in manifests: |
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349 if isinstance(manifest, basestring): |
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350 assert os.path.exists(manifest), "manifest '%s' not found" % manifest |
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351 f = file(manifest) |
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352 else: |
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353 f = manifest |
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354 |
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355 for line in f.readlines(): |
| 15 | 356 line = line.strip() |
| 357 if line.startswith('#') or not line: | |
| 358 continue | |
| 359 line = line.split() | |
| 360 if len(line) not in (3,4): | |
| 361 raise Exception("Format should be: %s; line %s" % (format_string, line)) | |
| 362 options = {} | |
| 363 if len(line) == 4: | |
| 364 option_string = line.pop().rstrip(',') | |
| 365 try: | |
| 366 options = dict([[j.strip() for j in i.split('=', 1)] | |
| 367 for i in option_string.split(',')]) | |
| 368 except: | |
| 369 raise Exception("Options format should be: key=value,key2=value2,...; got %s" % option_string) | |
| 0 | 370 |
| 15 | 371 url, dest, _type = line |
| 372 retval.append(dict(url=url, dest=dest, type=_type, options=options, manifest=manifest)) | |
| 373 return retval | |
| 0 | 374 |
| 2 | 375 def main(args=sys.argv[1:]): |
| 0 | 376 |
| 15 | 377 # parse command line options |
| 378 usage = '%prog [options] manifest [manifest] [...]' | |
| 0 | 379 |
| 15 | 380 class PlainDescriptionFormatter(optparse.IndentedHelpFormatter): |
| 381 def format_description(self, description): | |
| 382 if description: | |
| 383 return description + '\n' | |
| 384 else: | |
| 385 return '' | |
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386 |
| 15 | 387 parser = optparse.OptionParser(usage=usage, description=__doc__, formatter=PlainDescriptionFormatter()) |
| 388 parser.add_option('-o', '--output', | |
| 389 help="output relative to this location vs. the manifest location") | |
| 17 | 390 parser.add_option('-d', '--dest', # XXX unused |
| 15 | 391 action='append', |
| 392 help="output only these destinations") | |
| 393 parser.add_option('-s', '--strict', | |
| 394 action='store_true', default=False, | |
| 395 help="fail on error") | |
| 396 parser.add_option('--list-fetchers', dest='list_fetchers', | |
| 397 action='store_true', default=False, | |
| 398 help='list available fetchers and exit') | |
| 399 options, args = parser.parse_args(args) | |
| 0 | 400 |
| 15 | 401 if options.list_fetchers: |
| 17 | 402 types = set() |
| 403 for fetcher in fetchers: | |
| 404 if fetcher.type in types: | |
| 405 continue # occluded, should probably display separately | |
| 406 print '%s : %s' % (fetcher.type, fetcher.doc()) | |
| 407 types.add(fetcher.type) | |
| 15 | 408 parser.exit() |
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409 |
| 15 | 410 if not args: |
| 17 | 411 # TODO: could read from stdin |
| 15 | 412 parser.print_help() |
| 413 parser.exit() | |
| 0 | 414 |
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415 # sanity check |
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416 assert not [i for i in args if not os.path.exists(i)] |
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417 |
| 15 | 418 items = read_manifests(*args) |
| 32 | 419 fetch = Fetch(fetchers, relative_to=options.output, strict=options.strict) |
| 0 | 420 |
| 15 | 421 # download the files |
| 422 fetch.fetch(*items) | |
| 0 | 423 |
| 424 if __name__ == '__main__': | |
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425 main() |