How to checkout specific revision (e.g. an old one) with gclient?

[Van Thu]

Hi, I am new to chromium.

I follow the instruction from http://www.chromium.org/developers/how-tos/get-the-code, to get the code,

as I am on linux (Ubuntu 12.04), I get the code with the following steps:

fetch --nohooks chromium --nosvn=True # as I am not a committer

./build/install-build-deps.sh
gclient sync

in the src directory (I've checkout'ed), I do 'gclient sync --revision src@1000', but the return is: 'Checked out revision 31256.' 
On the link, I see "Using the last known good revision (LKGR)", so I think that if safesync_url is the problem, it makes gclient ignores --revision options, so I delete the 'safesync_url' from '.gclient' file, the content of '.gclient' becomes
  1 solutions = [
  2   { "name"        : "src",
  3     "url"         : "http://src.chromium.org/svn/trunk/src",
  4     "deps_file"   : "DEPS",
  5     "managed"     : True,
  6     "custom_deps" : {
  7     },
  8   },
  9 ]
 10 cache_dir = None

And, I do 'gclient sync --revision src@1000' again, but result is still the same.

So, What would be the problem?, this is really annoying.

[Robert Flack]

Change managed to False and then gclient sync will only update the sub repositories to the necessary versions for the version of 'src' you have checked out, and you can manually checkout whatever revision you want in src.

See http://dev.chromium.org/developers/how-tos/get-the-code#Managed_mode

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[Stefan Zager]

Robert's comment about 'managed' is correct, but that .gclient file
looks wrong. Unless you have a very good reason, you should not be
using an svn-based checkout. I'm surprised that running 'fetch' would
produce that .gclient file.

I suggest you make sure your copy of depot_tools is up-to-date, and try running:

fetch --nohooks --dry-run chromium --nosvn=True

Take a look at the 'gclient config' command it spits out; if it
doesn't contain this URL:

https://chromium.googlesource.com/chromium/src.git

... then please file a bug.

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