123 lines
4.7 KiB
Python
123 lines
4.7 KiB
Python
# Copyright (C) 2021 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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This source defines a self-contained function to fetch a perfetto prebuilt.
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This function is copy/pasted by //tools/roll-prebuilts in different places:
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- Into the //tools/{trace_processor, traceconv} scripts, which are just plain
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wrappers around executables.
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- Into the //tools/{heap_profiler, record_android_trace} scripts, which contain
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some other hand-written python code.
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In both cases toll-prebuilts copies this source (together with a manifest) into
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a section annotated with "BEGIN_SECTION_GENERATED_BY(roll-prebuilts)" / END... .
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The automated-copy-paste is to keep those script hermetic, so people can just
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download and run them without checking out the repo.
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The manifest argument looks as follows in the generated files:
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PERFETTO_PREBUILT_MANIFEST = [{
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'tool': 'trace_to_text',
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'arch': 'mac-amd64',
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'file_name': 'trace_to_text',
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'file_size': 7087080,
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'url': https://commondatastorage.googleapis.com/.../trace_to_text',
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'sha256': 7d957c005b0dc130f5bd855d6cec27e060d38841b320d04840afc569f9087490',
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'platform': 'darwin',
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'machine': 'x86_64'
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},
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...
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]
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The intended usage is:
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bin_path = get_perfetto_prebuilt('trace_processor_shell')
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subprocess.call(bin_path, ...)
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"""
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from logging import exception
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PERFETTO_PREBUILT_MANIFEST = []
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# COPIED_SECTION_START_MARKER
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# DO NOT EDIT. If you wish to make edits to this code, you need to change only
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# //tools/get_perfetto_prebuilt.py and run /tools/roll-prebuilts to regenerate
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# all the others scripts this is embedded into.
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def get_perfetto_prebuilt(tool_name, soft_fail=False, arch=None):
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""" Downloads the prebuilt, if necessary, and returns its path on disk. """
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# The first time this is invoked, it downloads the |url| and caches it into
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# ~/.perfetto/prebuilts/$tool_name. On subsequent invocations it just runs the
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# cached version.
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def download_or_get_cached(file_name, url, sha256):
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import os, hashlib, subprocess
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dir = os.path.join(
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os.path.expanduser('~'), '.local', 'share', 'perfetto', 'prebuilts')
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os.makedirs(dir, exist_ok=True)
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bin_path = os.path.join(dir, file_name)
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sha256_path = os.path.join(dir, file_name + '.sha256')
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needs_download = True
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# Avoid recomputing the SHA-256 on each invocation. The SHA-256 of the last
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# download is cached into file_name.sha256, just check if that matches.
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if os.path.exists(bin_path) and os.path.exists(sha256_path):
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with open(sha256_path, 'rb') as f:
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digest = f.read().decode()
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if digest == sha256:
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needs_download = False
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if needs_download:
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# Either the filed doesn't exist or the SHA256 doesn't match.
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tmp_path = bin_path + '.tmp'
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print('Downloading ' + url)
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subprocess.check_call(['curl', '-f', '-L', '-#', '-o', tmp_path, url])
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with open(tmp_path, 'rb') as fd:
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actual_sha256 = hashlib.sha256(fd.read()).hexdigest()
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if actual_sha256 != sha256:
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raise Exception('Checksum mismatch for %s (actual: %s, expected: %s)' %
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(url, actual_sha256, sha256))
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os.chmod(tmp_path, 0o755)
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os.rename(tmp_path, bin_path)
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with open(sha256_path, 'w') as f:
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f.write(sha256)
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return bin_path
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# --- end of download_or_get_cached() ---
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# --- get_perfetto_prebuilt() function starts here. ---
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import os, platform, sys
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plat = sys.platform.lower()
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machine = platform.machine().lower()
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manifest_entry = None
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for entry in PERFETTO_PREBUILT_MANIFEST:
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# If the caller overrides the arch, just match that (for Android prebuilts).
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if arch and entry.get('arch') == arch:
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manifest_entry = entry
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break
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# Otherwise guess the local machine arch.
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if entry.get('tool') == tool_name and entry.get(
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'platform') == plat and machine in entry.get('machine', []):
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manifest_entry = entry
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break
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if manifest_entry is None:
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if soft_fail:
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return None
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raise Exception(
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('No prebuilts available for %s-%s\n' % (plat, machine)) +
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'See https://perfetto.dev/docs/contributing/build-instructions')
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return download_or_get_cached(
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file_name=manifest_entry['file_name'],
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url=manifest_entry['url'],
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sha256=manifest_entry['sha256'])
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