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Infrastructure FAQ

Why do some DEPS / .gclient URLs use http://, https://, svn:// ?

We would like .gclient files to function correctly for users both inside and outside Google.

In order to facilitate this, whenever a DEPS file lists repositories, read-only publicly accessible URLs are preferred.

These typically being with http://

For example: - read-only URL for base from chromium. - read-only nacl main repo

Sometimes svn:// and https:// URLs are used.

There are two main reasons:

Google Code (nativeclient, naclport, etc) only supports http:// and https://.

Chromium's primary svn mirror ( does http:// only.

Chromium's svn servers (, chrome-svn) support only svn://.

How do I make changes outside src/native_client?

If the repository is internal only, make changes as usual, use gcl in each repository.

You can use ==svn info== to get information about the repository you're currently in.

For public repositories, you may need to make sure you've got a writable client.

(gclient can use svn switch to switch from read-only to writable in most cases preserving patches).

To make a particular repository checkout writable, add a section like the following to you .gclient file:

"custom_deps" : {

"native_client/third_party/foo": "",


This overrides the URL specified for foo in native_client/DEPS

How can I make gclient not check everything out?

Modify your .gclient file to add a custom_deps section, listing None for the paths to exclude:

"custom_deps" : {

"src/data/esctf": None,

"src/data/mozilla_js_tests": None,

"src/data/page_cycler": None,

"src/data/tab_switching": None,

"src/data/saved_caches": None,

"src/data/selenium_core": None,

"src/tools/grit/grit/test/data": None,


Note: the above instruction is not useful because most of the checkout time is consumed by downloading all the necessary toolchains and unpacking them. To manually disable one of the toolchains from downloading, first download all of them in the initial checkout.

shell$ ls native_client/toolchain

To disable updating one of them, for example, pnacl_linux_x86_64, change the test in file:

shell$ echo manual > native_client/toolchain/pnacl_linux_x86_64/SOURCE_URL

All subsequent gclient syncs would (hopefully) assume that this toolchain is up-to-date.

I keep getting patch failure on the trybots, what do I do?

Patches typically fail on the trybots because of version mismatch between what is in the patch and the revision that the trybot wants to patch against.

If your client is really old, do a gclient update before submitting try jobs to bring it in sync.

The trybot uses (last known good revision), to decide what to patch against.

This is intended to allow you to submit try jobs, even when the tree is red.

If you ever need to apply a patch which does not work against the default on the try bot, you can add various flags to gcl try:

I get strange error messages when compiling on Windows, what do I do?

Be sure to install all the service packs listed for chromium:

The toolchain in native_client appears to be out of date. How do I safely update it?

If you make changes to the untrusted or shared code, you need to update the toolchain revision(s) after your change is committed and the toolchain build is green. (If the toolchain build is red, you will need to check in a fix right away or simply rollback your change). For example, we updated the ppapi revision in DEPS, which required updates to the code under src/shared. This needs a toolchain revision update. So we have: PPAPI DEPS revision: Follow-up fix revision: There are two families of toolchains that generally need to be updated in nactive_client/DEPS: arm_toolchain_version and x86_toolchain_version. It is recommended to update them both to the same revision at a time. To perform this straightforward toolchain revision update:

To perform toolchain revision update for only one family (i.e. arm_toolchain_version or x86_toolchain_version) you will need only the 'OK' for that family in toolchain tarballs availability and buildber green status only of a subset of the rows (subject to frequent change):

TODO: describe the update procedure for NaCl SDK (requires updating toolchain DEPS in the Chrome tree, pushing the new manifest).