It looks like the location for tooltool that this code uses (https://raw.githubusercontent.com/mozilla/build-tooltool/master/tooltool.py) has changed.

https://github.com/mozilla/build-tooltool/commit/8d739683dbab92c1d8734425da3661be9e61944b

Error output:

➜  mozilla-source-2 hg:(03bf514a9721 default tip) ✗ ./mach android-emulator                                                                              
 0:01.07 Fetching and installing AVD. This may take a few minutes...
Error running mach:

    ['android-emulator']

The error occurred in code that was called by the mach command. This is either
a bug in the called code itself or in the way that mach is calling it.
You can invoke |./mach busted| to check if this issue is already on file. If it
isn't, please use |./mach busted file| to report it. If |./mach busted| is
misbehaving, you can also inspect the dependencies of bug 1543241.

If filing a bug, please include the full output of mach, including this error
message.

The details of the failure are as follows:

HTTPError: HTTP Error 404: Not Found

  File "/Users/aerickson/hg/mozilla-source-2/mobile/android/mach_commands.py", line 662, in emulator
    emulator.update_avd(force_update)
  File "/Users/aerickson/hg/mozilla-source-2/testing/mozbase/mozrunner/mozrunner/devices/android_device.py", line 529, in update_avd
    _tooltool_fetch()
  File "/Users/aerickson/hg/mozilla-source-2/testing/mozbase/mozrunner/mozrunner/devices/android_device.py", line 867, in _tooltool_fetch
    _download_file(TOOLTOOL_URL, 'tooltool.py', EMULATOR_HOME_DIR)
  File "/Users/aerickson/hg/mozilla-source-2/testing/mozbase/mozrunner/mozrunner/devices/android_device.py", line 830, in _download_file
    f = urllib.request.urlopen(url)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 435, in open
    response = meth(req, response)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 548, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 473, in error
    return self._call_chain(*args)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/usr/local/Cellar/python@2/2.7.16/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 556, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
➜  mozilla-source-2 hg:(03bf514a9721 default tip) ✗ 

New location is: https://raw.githubusercontent.com/mozilla/release-services/master/src/tooltool/client/tooltool.py

I have a fix. Will post shortly.

That file is available in-tree, although at some odd locations:

./python/mozbuild/mozbuild/action/tooltool.py
./testing/mozharness/external_tools/tooltool.py

it'd be fine to put it at another location, or use one of those, if that's more reliable than fetching it on every task.

Backed out changeset 67463f3dd222 (Bug 1545860) for flake lint failure on android_device.py

Push with failure: https://treeherder.mozilla.org/#/jobs?repo=autoland&revision=67463f3dd222b254016a8bd210d9f5e3052bf1d8&selectedJob=241838079

Backout link: https://hg.mozilla.org/integration/autoland/rev/efe40065f0ea38258a80f80b2330e63104281c51

Failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=241838079&repo=autoland&lineNumber=288

[vcs 2019-04-22T18:01:22.043Z] TinderboxPrint:<a href=https://hg.mozilla.org/integration/autoland/rev/67463f3dd222b254016a8bd210d9f5e3052bf1d8 title='Built from autoland revision 67463f3dd222b254016a8bd210d9f5e3052bf1d8'>67463f3dd222b254016a8bd210d9f5e3052bf1d8</a>
[task 2019-04-22T18:01:22.043Z] executing ['bash', '-cx', 'cd $GECKO_PATH && ./mach lint -l flake8 -f treeherder -f json:/builds/worker/mozlint.json']
[task 2019-04-22T18:01:22.045Z] + cd /builds/worker/checkouts/gecko
[task 2019-04-22T18:01:22.045Z] + ./mach lint -l flake8 -f treeherder -f json:/builds/worker/mozlint.json
[task 2019-04-22T18:01:23.026Z] New python executable in /builds/worker/checkouts/gecko/obj-x86_64-pc-linux-gnu/_virtualenvs/init/bin/python2.7
[task 2019-04-22T18:01:23.026Z] Also creating executable in /builds/worker/checkouts/gecko/obj-x86_64-pc-linux-gnu/_virtualenvs/init/bin/python
[task 2019-04-22T18:01:24.744Z] Installing setuptools, pip, wheel...done.
[task 2019-04-22T18:01:26.155Z] running build_ext
[task 2019-04-22T18:01:26.155Z] building 'psutil._psutil_linux' extension
[task 2019-04-22T18:01:26.155Z] creating build
[task 2019-04-22T18:01:26.155Z] creating build/temp.linux-x86_64-2.7
[task 2019-04-22T18:01:26.155Z] creating build/temp.linux-x86_64-2.7/psutil
[task 2019-04-22T18:01:26.155Z] x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=543 -DPSUTIL_LINUX=1 -I/usr/include/python2.7 -c psutil/_psutil_common.c -o build/temp.linux-x86_64-2.7/psutil/_psutil_common.o
[task 2019-04-22T18:01:26.155Z] x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=543 -DPSUTIL_LINUX=1 -I/usr/include/python2.7 -c psutil/_psutil_posix.c -o build/temp.linux-x86_64-2.7/psutil/_psutil_posix.o
[task 2019-04-22T18:01:26.155Z] x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=543 -DPSUTIL_LINUX=1 -I/usr/include/python2.7 -c psutil/_psutil_linux.c -o build/temp.linux-x86_64-2.7/psutil/_psutil_linux.o
[task 2019-04-22T18:01:26.155Z] creating build/lib.linux-x86_64-2.7
[task 2019-04-22T18:01:26.155Z] creating build/lib.linux-x86_64-2.7/psutil
[task 2019-04-22T18:01:26.155Z] x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/psutil/_psutil_common.o build/temp.linux-x86_64-2.7/psutil/_psutil_posix.o build/temp.linux-x86_64-2.7/psutil/_psutil_linux.o -o build/lib.linux-x86_64-2.7/psutil/_psutil_linux.so
[task 2019-04-22T18:01:26.155Z] building 'psutil._psutil_posix' extension
[task 2019-04-22T18:01:26.155Z] x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=543 -DPSUTIL_LINUX=1 -I/usr/include/python2.7 -c psutil/_psutil_common.c -o build/temp.linux-x86_64-2.7/psutil/_psutil_common.o
[task 2019-04-22T18:01:26.155Z] x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -fPIC -DPSUTIL_POSIX=1 -DPSUTIL_VERSION=543 -DPSUTIL_LINUX=1 -I/usr/include/python2.7 -c psutil/_psutil_posix.c -o build/temp.linux-x86_64-2.7/psutil/_psutil_posix.o
[task 2019-04-22T18:01:26.155Z] x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions -Wl,-Bsymbolic-functions -Wl,-z,relro -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wl,-Bsymbolic-functions -Wl,-z,relro -Wdate-time -D_FORTIFY_SOURCE=2 -g -fstack-protector-strong -Wformat -Werror=format-security build/temp.linux-x86_64-2.7/psutil/_psutil_common.o build/temp.linux-x86_64-2.7/psutil/_psutil_posix.o -o build/lib.linux-x86_64-2.7/psutil/_psutil_posix.so
[task 2019-04-22T18:01:26.155Z] copying build/lib.linux-x86_64-2.7/psutil/_psutil_linux.so -> psutil
[task 2019-04-22T18:01:26.155Z] copying build/lib.linux-x86_64-2.7/psutil/_psutil_posix.so -> psutil
[task 2019-04-22T18:01:26.155Z]
[task 2019-04-22T18:01:26.155Z] Error processing command. Ignoring because optional. (optional:packages.txt:comm/build/virtualenv_packages.txt)
[task 2019-04-22T18:04:02.809Z] TEST-UNEXPECTED-ERROR | /builds/worker/checkouts/gecko/testing/mozbase/mozrunner/mozrunner/devices/android_device.py:30:100 | line too long (114 > 99 characters) (E501)
[taskcluster 2019-04-22 18:04:03.290Z] === Task Finished ===
[taskcluster 2019-04-22 18:04:04.065Z] Unsuccessful task run with exit code: 1 completed in 486.569 seconds

fix flake error

Pushed by gbrown@mozilla.com:
https://hg.mozilla.org/integration/autoland/rev/b3ff6570a179
fix tooltool url, r2 r=bc,gbrown

https://hg.mozilla.org/mozilla-central/rev/b3ff6570a179