upstream/mercurial-mirror Files · contrib/automation/hgautomation/__init__.py

dirs: resolve fuzzer OOM situation by disallowing deep directory hierarchies...

dirs: resolve fuzzer OOM situation by disallowing deep directory hierarchies It seems like 2048 directories ought to be enough for any reasonable use of Mercurial? A previous version of this patch scanned for slashes before any allocations occurred. That approach is slower than this in the happy path, but much faster than this in the case that too many slashes are encountered. We may want to revisit it in the future using memchr() so it'll be well-optimized by the libc we're using. .. bc: Mercurial will now defend against OOMs by refusing to operate on paths with 2048 or more components. This means that _extremely_ deep path hierarchies will be rejected, but we anticipate nobody is using hierarchies this deep. Differential Revision: https://phab.mercurial-scm.org/D7411

Augie Fackler - - Load All Authors

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      # __init__.py - High-level automation interfaces

      #

      # Copyright 2019 Gregory Szorc <gregory.szorc@gmail.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      # no-check-code because Python 3 native.

      import pathlib

      import secrets

      from .aws import AWSConnection

      class HGAutomation:

          """High-level interface for Mercurial automation.

          Holds global state, provides access to other primitives, etc.

          """

          def __init__(self, state_path: pathlib.Path):

              self.state_path = state_path

              state_path.mkdir(exist_ok=True)

          def default_password(self):

              """Obtain the default password to use for remote machines.

              A new password will be generated if one is not stored.

              """

              p = self.state_path / 'default-password'

              try:

                  with p.open('r', encoding='ascii') as fh:

                      data = fh.read().strip()

                      if data:

                          return data

              except FileNotFoundError:

                  pass

              password = secrets.token_urlsafe(24)

              with p.open('w', encoding='ascii') as fh:

                  fh.write(password)

                  fh.write('\n')

              p.chmod(0o0600)

              return password

          def aws_connection(self, region: str, ensure_ec2_state: bool = True):

              """Obtain an AWSConnection instance bound to a specific region."""

              return AWSConnection(self, region, ensure_ec2_state=ensure_ec2_state)

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				# __init__.py - High-level automation interfaces
				#
				# Copyright 2019 Gregory Szorc <gregory.szorc@gmail.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				# no-check-code because Python 3 native.

				import pathlib
				import secrets

				from .aws import AWSConnection


				class HGAutomation:
				"""High-level interface for Mercurial automation.

				Holds global state, provides access to other primitives, etc.
				"""

				def __init__(self, state_path: pathlib.Path):
				self.state_path = state_path

				state_path.mkdir(exist_ok=True)

				def default_password(self):
				"""Obtain the default password to use for remote machines.

				A new password will be generated if one is not stored.
				"""
				p = self.state_path / 'default-password'

				try:
				with p.open('r', encoding='ascii') as fh:
				data = fh.read().strip()

				if data:
				return data

				except FileNotFoundError:
				pass

				password = secrets.token_urlsafe(24)

				with p.open('w', encoding='ascii') as fh:
				fh.write(password)
				fh.write('\n')

				p.chmod(0o0600)

				return password

				def aws_connection(self, region: str, ensure_ec2_state: bool = True):
				"""Obtain an AWSConnection instance bound to a specific region."""

				return AWSConnection(self, region, ensure_ec2_state=ensure_ec2_state)