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diff --git a/testing/mozharness/mozharness/base/errors.py b/testing/mozharness/mozharness/base/errors.py
new file mode 100755
index 0000000000..e8b8084163
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+++ b/testing/mozharness/mozharness/base/errors.py
@@ -0,0 +1,162 @@
+#!/usr/bin/env python
+# ***** BEGIN LICENSE BLOCK *****
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+# ***** END LICENSE BLOCK *****
+"""Generic error lists.
+
+Error lists are used to parse output in mozharness.base.log.OutputParser.
+
+Each line of output is matched against each substring or regular expression
+in the error list.  On a match, we determine the 'level' of that line,
+whether IGNORE, DEBUG, INFO, WARNING, ERROR, CRITICAL, or FATAL.
+
+TODO: Context lines (requires work on the OutputParser side)
+
+TODO: We could also create classes that generate these, but with the
+appropriate level (please don't die on any errors; please die on any
+warning; etc.) or platform or language or whatever.
+"""
+
+import re
+
+from mozharness.base.log import CRITICAL, DEBUG, ERROR, WARNING
+
+
+# Exceptions
+class VCSException(Exception):
+    pass
+
+
+# ErrorLists {{{1
+BaseErrorList = [{"substr": r"""command not found""", "level": ERROR}]
+
+HgErrorList = BaseErrorList + [
+    {
+        "regex": re.compile(r"""^abort:"""),
+        "level": ERROR,
+        "explanation": "Automation Error: hg not responding",
+    },
+    {
+        "substr": r"""unknown exception encountered""",
+        "level": ERROR,
+        "explanation": "Automation Error: python exception in hg",
+    },
+    {
+        "substr": r"""failed to import extension""",
+        "level": WARNING,
+        "explanation": "Automation Error: hg extension missing",
+    },
+]
+
+GitErrorList = BaseErrorList + [
+    {"substr": r"""Permission denied (publickey).""", "level": ERROR},
+    {"substr": r"""fatal: The remote end hung up unexpectedly""", "level": ERROR},
+    {"substr": r"""does not appear to be a git repository""", "level": ERROR},
+    {"substr": r"""error: src refspec""", "level": ERROR},
+    {"substr": r"""invalid author/committer line -""", "level": ERROR},
+    {"substr": r"""remote: fatal: Error in object""", "level": ERROR},
+    {
+        "substr": r"""fatal: sha1 file '<stdout>' write error: Broken pipe""",
+        "level": ERROR,
+    },
+    {"substr": r"""error: failed to push some refs to """, "level": ERROR},
+    {"substr": r"""remote: error: denying non-fast-forward """, "level": ERROR},
+    {"substr": r"""! [remote rejected] """, "level": ERROR},
+    {"regex": re.compile(r"""remote:.*No such file or directory"""), "level": ERROR},
+]
+
+PythonErrorList = BaseErrorList + [
+    {"regex": re.compile(r"""Warning:.*Error: """), "level": WARNING},
+    {"regex": re.compile(r"""package.*> Error:"""), "level": ERROR},
+    {"substr": r"""Traceback (most recent call last)""", "level": ERROR},
+    {"substr": r"""SyntaxError: """, "level": ERROR},
+    {"substr": r"""TypeError: """, "level": ERROR},
+    {"substr": r"""NameError: """, "level": ERROR},
+    {"substr": r"""ZeroDivisionError: """, "level": ERROR},
+    {"regex": re.compile(r"""raise \w*Exception: """), "level": CRITICAL},
+    {"regex": re.compile(r"""raise \w*Error: """), "level": CRITICAL},
+]
+
+VirtualenvErrorList = [
+    {"substr": r"""not found or a compiler error:""", "level": WARNING},
+    {"regex": re.compile(r"""\d+: error: """), "level": ERROR},
+    {"regex": re.compile(r"""\d+: warning: """), "level": WARNING},
+    {
+        "regex": re.compile(r"""Downloading .* \(.*\): *([0-9]+%)? *[0-9\.]+[kmKM]b"""),
+        "level": DEBUG,
+    },
+] + PythonErrorList
+
+RustErrorList = [
+    {"regex": re.compile(r"""^error(?:\[E\d+\])?: """), "level": ERROR},
+    {"substr": r"""thread 'main' panicked at""", "level": ERROR},
+]
+
+# We may need to have various MakefileErrorLists for differing amounts of
+# warning-ignoring-ness.
+MakefileErrorList = (
+    BaseErrorList
+    + PythonErrorList
+    + RustErrorList
+    + [
+        {"substr": r""": error: """, "level": ERROR},
+        {"substr": r"""No rule to make target """, "level": ERROR},
+        {"regex": re.compile(r"""akefile.*was not found\."""), "level": ERROR},
+        {"regex": re.compile(r"""Stop\.$"""), "level": ERROR},
+        {
+            "regex": re.compile(r"""make\[\d+\]: \*\*\* \[.*\] Error \d+"""),
+            "level": ERROR,
+        },
+        {"regex": re.compile(r""":\d+: warning:"""), "level": WARNING},
+        {"regex": re.compile(r"""make(?:\[\d+\])?: \*\*\*/"""), "level": ERROR},
+        {"substr": r"""Warning: """, "level": WARNING},
+    ]
+)
+
+TarErrorList = BaseErrorList + [
+    {"substr": r"""(stdin) is not a bzip2 file.""", "level": ERROR},
+    {"regex": re.compile(r"""Child returned status [1-9]"""), "level": ERROR},
+    {"substr": r"""Error exit delayed from previous errors""", "level": ERROR},
+    {"substr": r"""stdin: unexpected end of file""", "level": ERROR},
+    {"substr": r"""stdin: not in gzip format""", "level": ERROR},
+    {"substr": r"""Cannot exec: No such file or directory""", "level": ERROR},
+    {"substr": r""": Error is not recoverable: exiting now""", "level": ERROR},
+]
+
+ZipErrorList = BaseErrorList + [
+    {
+        "substr": r"""zip warning:""",
+        "level": WARNING,
+    },
+    {
+        "substr": r"""zip error:""",
+        "level": ERROR,
+    },
+    {
+        "substr": r"""Cannot open file: it does not appear to be a valid archive""",
+        "level": ERROR,
+    },
+]
+
+ZipalignErrorList = BaseErrorList + [
+    {
+        "regex": re.compile(r"""Unable to open .* as a zip archive"""),
+        "level": ERROR,
+    },
+    {
+        "regex": re.compile(r"""Output file .* exists"""),
+        "level": ERROR,
+    },
+    {
+        "substr": r"""Input and output can't be the same file""",
+        "level": ERROR,
+    },
+]
+
+
+# __main__ {{{1
+if __name__ == "__main__":
+    """TODO: unit tests."""
+    pass