I realized that the actual problem is this command:

C:\\Users\\rob\\Projects\\depot_tools_win\\win_tools-2_7_6_bin\\python\\bin\\python.exe
 
c:\\Users\\rob\\Projects\\google\\v8\\v8\\third_party\\depot_tools\\win_toolchain\\get_toolchain_if_necessary.py
 
--output-json 
c:\\Users\\rob\\Projects\\google\\v8\\v8\\build\\win_toolchain.json 
3bc0ec615cf20ee342f3bc29bc991b5ad66d8d2c

the output is just:
Please follow the instructions at 
https://chromium.googlesource.com/chromium/src/+/master/docs/windows_build_instructions.md

On Saturday, October 6, 2018 at 1:21:33 AM UTC-7, r...@controlzee.com wrote:
>
> Hello!
>
> I'm trying to fetch and build v8 on Windows 10. As far as I know I have 
> all the correct prerequisites.
>
> When I run fetch v8, when it gets to the closure compiler it prompts me 
> with:
> Username for 'https://chrome-internal.googlesource.com':
>
> Whether I enter a user name or leave it blank, I get an exception in 
> fetch.py.
>
> I've deleted the v8 directory completely and tried multiple times, but I 
> always get the same result.
>
> Can anyone tell me what I'm doing wrong?
>
> Thanks,
>
> Rob
>
> Here's the complete output of my last run:
>
> C:\Users\rob\Projects\google>fetch v8
> Running: 
> 'C:\Users\rob\Projects\depot_tools_win\win_tools-2_7_6_bin\python\bin\python.exe'
>  
> 'C:\Users\rob\Projects\depot_tools_win\gclient.py' root
> Running: 
> 'C:\Users\rob\Projects\depot_tools_win\win_tools-2_7_6_bin\python\bin\python.exe'
>  
> 'C:\Users\rob\Projects\depot_tools_win\gclient.py' config --spec 'solutions 
> = [
>   {
>     "url": "https://chromium.googlesource.com/v8/v8.git";,
>     "managed": False,
>     "name": "v8",
>     "deps_file": "DEPS",
>     "custom_deps": {},
>   },
> ]
> '
> Running: 
> 'C:\Users\rob\Projects\depot_tools_win\win_tools-2_7_6_bin\python\bin\python.exe'
>  
> 'C:\Users\rob\Projects\depot_tools_win\gclient.py' sync --with_branch_heads
>
> ________ running 'git -c core.deltaBaseCacheLimit=512m clone --no-checkout 
> --progress https://chromium.googlesource.com/v8/v8.git 
> C:\Users\rob\Projects\google\_gclient_v8_kfdtq7' 
> in 'C:\Users\rob\Projects\google'
> Cloning into 'C:\Users\rob\Projects\google\_gclient_v8_kfdtq7'...
> remote: Sending approximately 390.83 MiB ...
> remote: Counting objects: 7660, done
> remote: Total 599446 (delta 504070), reused 599446 (delta 504070)
> Receiving objects: 100% (599446/599446), 390.80 MiB | 21.66 MiB/s, done.
> Resolving deltas:  97% (489729/504070)
> [0:01:00] Still working on:
> [0:01:00]   v8
> Resolving deltas: 100% (504070/504070), done.
>
> [0:01:10] Still working on:
> [0:01:10]   v8
>
> [0:01:20] Still working on:
> [0:01:20]   v8
> Syncing projects:   0% ( 0/ 2)
> [0:01:24] Still working on:
> [0:01:24]   v8
> Syncing projects: 100% (22/22), done.
>
> ________ running 'download_from_google_storage --no_resume 
> --platform=win32 --no_auth --bucket chromium-clang-format -s 
> v8/buildtools/win/clang-format.exe.sha1' in 'C:\Users\rob\Projects\google'
> 0> Downloading v8/buildtools/win/clang-format.exe...
> Downloading 1 files took 7.899000 second(s)
> Running hooks:  26% ( 8/30) luci-go_win
> ________ running 'download_from_google_storage --no_resume 
> --platform=win32 --no_auth --bucket chromium-luci -d 
> v8/tools/luci-go/win64' in 'C:\Users\rob\Projects\google'
> 0> Downloading v8/tools/luci-go/win64\isolate.exe...
> Downloading 1 files took 7.446000 second(s)
> Running hooks:  36% (11/30) gn_win
> ________ running 'download_from_google_storage --no_resume 
> --platform=win32 --no_auth --bucket chromium-gn -s 
> v8/buildtools/win/gn.exe.sha1' in 'C:\Users\rob\Projects\google'
> 0> Downloading v8/buildtools/win/gn.exe...
> Downloading 1 files took 11.748000 second(s)
> Hook 'download_from_google_storage --no_resume --platform=win32 --no_auth 
> --bucket chromium-gn -s v8/buildtools/win/gn.exe.sha1' took 11.96 secs
> Running hooks:  46% (14/30) wasm_spec_tests
> ________ running 'download_from_google_storage --no_resume --no_auth -u 
> --bucket v8-wasm-spec-tests -s v8/test/wasm-spec-tests/tests.tar.gz.sha1' 
> in 'C:\Users\rob\Projects\google'
> 0> Downloading v8/test/wasm-spec-tests/tests.tar.gz...
> 0> Extracting 72 entries from v8/test/wasm-spec-tests/tests.tar.gz to 
> v8/test/wasm-spec-tests/tests
> Downloading 1 files took 14.183000 second(s)
> Hook 'download_from_google_storage --no_resume --no_auth -u --bucket 
> v8-wasm-spec-tests -s v8/test/wasm-spec-tests/tests.tar.gz.sha1' took 14.68 
> secs
> Running hooks:  50% (15/30) closure_compiler
> ________ running 'download_from_google_storage --no_resume --no_auth -u 
> --bucket chromium-v8-closure-compiler -s 
> v8/src/inspector/build/closure-compiler.tar.gz.sha1' in 
> 'C:\Users\rob\Projects\google'
> 0> Downloading v8/src/inspector/build/closure-compiler.tar.gz...
> 0> Extracting 4 entries from 
> v8/src/inspector/build/closure-compiler.tar.gz to 
> v8/src/inspector/build/closure-compiler
> Downloading 1 files took 14.433000 second(s)
> Hook 'download_from_google_storage --no_resume --no_auth -u --bucket 
> chromium-v8-closure-compiler -s 
> v8/src/inspector/build/closure-compiler.tar.gz.sha1' took 14.95 secs
> Username for 'https://chrome-internal.googlesource.com':
>
> ________ running 
> 'C:\Users\rob\Projects\depot_tools_win\win_tools-2_7_6_bin\python\bin\python.exe
>  
> v8/build/vs_toolchain.py update' in 'C:\Users\rob\Projects\google'
>
>
>
> Please follow the instructions at 
> https://chromium.googlesource.com/chromium/src/+/master/docs/windows_build_instructions.md
>
>
> Traceback (most recent call last):
>   File "v8/build/vs_toolchain.py", line 468, in <module>
>     sys.exit(main())
>   File "v8/build/vs_toolchain.py", line 464, in main
>     return commands[sys.argv[1]](*sys.argv[2:])
>   File "v8/build/vs_toolchain.py", line 410, in Update
>     subprocess.check_call(get_toolchain_args)
>   File 
> "C:\Users\rob\Projects\depot_tools_win\win_tools-2_7_6_bin\python\bin\lib\subprocess.py",
>  
> line 540, in check_call
>     raise CalledProcessError(retcode, cmd)
> subprocess.CalledProcessError: Command 
> '['C:\\Users\\rob\\Projects\\depot_tools_win\\win_tools-2_7_6_bin\\python\\bin\\python.exe',
>  
> 'C:\\Users\\rob\\Projects\\google\\v8\\third_party\\depot_tools\\win_toolchain\\get_toolchain_if_necessary.py',
>  
> '--output-json', 
> 'C:\\Users\\rob\\Projects\\google\\v8\\build\\win_toolchain.json', 
> '3bc0ec615cf20ee342f3bc29bc991b5ad66d8d2c']' returned non-zero exit status 1
> Error: Command 
> 'C:\\Users\\rob\\Projects\\depot_tools_win\\win_tools-2_7_6_bin\\python\\bin\\python.exe
>  
> v8/build/vs_toolchain.py update' returned non-zero exit status 1 in 
> C:\Users\rob\Projects\google
> Hook 
> ''C:\Users\rob\Projects\depot_tools_win\win_tools-2_7_6_bin\python\bin\python.exe'
>  
> v8/build/vs_toolchain.py update' took 43.10 secs
> Traceback (most recent call last):
>   File "C:\Users\rob\Projects\depot_tools_win\\fetch.py", line 306, in 
> <module>
>     sys.exit(main())
>   File "C:\Users\rob\Projects\depot_tools_win\\fetch.py", line 301, in main
>     return run(options, spec, root)
>   File "C:\Users\rob\Projects\depot_tools_win\\fetch.py", line 295, in run
>     return checkout.init()
>   File "C:\Users\rob\Projects\depot_tools_win\\fetch.py", line 137, in init
>     self.run_gclient(*sync_cmd)
>   File "C:\Users\rob\Projects\depot_tools_win\\fetch.py", line 82, in 
> run_gclient
>     return self.run(cmd_prefix + cmd, **kwargs)
>   File "C:\Users\rob\Projects\depot_tools_win\\fetch.py", line 71, in run
>     subprocess.check_call(cmd, **kwargs)
>   File 
> "C:\Users\rob\Projects\depot_tools_win\win_tools-2_7_6_bin\python\bin\lib\subprocess.py",
>  
> line 540, in check_call
>     raise CalledProcessError(retcode, cmd)
> subprocess.CalledProcessError: Command 
> '('C:\\Users\\rob\\Projects\\depot_tools_win\\win_tools-2_7_6_bin\\python\\bin\\python.exe',
>  
> 'C:\\Users\\rob\\Projects\\depot_tools_win\\gclient.py', 'sync', 
> '--with_branch_heads')' returned non-zero exit status 2
>

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