repo errors
1.同步源码repo sync的时候出现以下错误
```
error: Failed connect to android.googlesource.com:443; Connection timed out while accessing
fatal: HTTP request failed
可以尝试ping一下android.googlesource.com，如果ping不通的话，可以修改hosts。方法为，在终端中输入：
[plain]view plaincopy
sudo gedit /etc/hosts
在host文件中增加以下内容：
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74.125.31.82 www.googlesource.com
74.125.31.82 android.googlesource.com
203.208.46.172 cache.pack.google.com
59.24.3.173 cache.pack.google.com
注意，一定要检查该域名是否能ping通，ping不通的话再改，本人就是本来能ping通的，改完就出错了
执行的操作
repo init -u https://github.com/CyanogenMod/android.git -b cm-13.0
Traceback (most recent call last): File "/work/information/source_code/google/abc/.repo/repo/main.py", line 414, in _Main(sys.argv[1:]) File "/work/information/source_code/google/abc/.repo/repo/main.py", line 390, in _Main result = repo._Run(argv) or 0 File "/work/information/source_code/google/abc/.repo/repo/main.py", line 138, in _Run result = cmd.Execute(copts, cargs) File "/work/information/source_code/google/abc/.repo/repo/subcmds/init.py", line 347, in Execute self._SyncManifest(opt) File "/work/information/source_code/google/abc/.repo/repo/subcmds/init.py", line 203, in _SyncManifest m.Sync_LocalHalf(syncbuf) File "/work/information/source_code/google/abc/.repo/repo/project.py", line 1120, in Sync_LocalHalf upstream_gain = self._revlist(not_rev(HEAD), revid) File "/work/information/source_code/google/abc/.repo/repo/project.py", line 2006, in _revlist return self.work_git.rev_list(*a, **kw) File "/work/information/source_code/google/abc/.repo/repo/project.py", line 2155, in rev_list p.stderr)) error.GitError: manifests rev-list ('^HEAD', '4c2be345d6bfc25db87f23749912ae9d98d2ad62', '--'): fatal: bad revision '^HEAD'
解决办法；
删除.repo 目录下的 除 repo 文件夹之外的其它所有文件，重新执行inti和sync
可以执行： rm -rf .repo/manifest*
