poky/meta/lib/oe/reproducible.py - openbmc/openbmc - Gitiles

 #
 # SPDX-License-Identifier: GPL-2.0-only
 #
 import os
 import subprocess
 import bb

 # For reproducible builds, this code sets the default SOURCE_DATE_EPOCH in each
 # component's build environment. The format is number of seconds since the
 # system epoch.
 #
 # Upstream components (generally) respect this environment variable,
 # using it in place of the "current" date and time.
 # See https://reproducible-builds.org/specs/source-date-epoch/
 #
 # The default value of SOURCE_DATE_EPOCH comes from the function
 # get_source_date_epoch_value which reads from the SDE_FILE, or if the file
 # is not available will use the fallback of SOURCE_DATE_EPOCH_FALLBACK.
 #
 # The SDE_FILE is normally constructed from the function
 # create_source_date_epoch_stamp which is typically added as a postfuncs to
 # the do_unpack task.  If a recipe does NOT have do_unpack, it should be added
 # to a task that runs after the source is available and before the
 # do_deploy_source_date_epoch task is executed.
 #
 # If a recipe wishes to override the default behavior it should set it's own
 # SOURCE_DATE_EPOCH or override the do_deploy_source_date_epoch_stamp task
 # with recipe-specific functionality to write the appropriate
 # SOURCE_DATE_EPOCH into the SDE_FILE.
 #
 # SOURCE_DATE_EPOCH is intended to be a reproducible value.  This value should
 # be reproducible for anyone who builds the same revision from the same
 # sources.
 #
 # There are 4 ways the create_source_date_epoch_stamp function determines what
 # becomes SOURCE_DATE_EPOCH:
 #
 # 1. Use the value from __source_date_epoch.txt file if this file exists.
 #    This file was most likely created in the previous build by one of the
 #    following methods 2,3,4.
 #    Alternatively, it can be provided by a recipe via SRC_URI.
 #
 # If the file does not exist:
 #
 # 2. If there is a git checkout, use the last git commit timestamp.
 #    Git does not preserve file timestamps on checkout.
 #
 # 3. Use the mtime of "known" files such as NEWS, CHANGLELOG, ...
 #    This works for well-kept repositories distributed via tarball.
 #
 # 4. Use the modification time of the youngest file in the source tree, if
 #    there is one.
 #    This will be the newest file from the distribution tarball, if any.
 #
 # 5. Fall back to a fixed timestamp (SOURCE_DATE_EPOCH_FALLBACK).
 #
 # Once the value is determined, it is stored in the recipe's SDE_FILE.

 def get_source_date_epoch_from_known_files(d, sourcedir):
     source_date_epoch = None
     newest_file = None
     known_files = set(["NEWS", "ChangeLog", "Changelog", "CHANGES"])
     for file in known_files:
         filepath = os.path.join(sourcedir, file)
         if os.path.isfile(filepath):
             mtime = int(os.lstat(filepath).st_mtime)
             # There may be more than one "known_file" present, if so, use the youngest one
             if not source_date_epoch or mtime > source_date_epoch:
                 source_date_epoch = mtime
                 newest_file = filepath
     if newest_file:
         bb.debug(1, "SOURCE_DATE_EPOCH taken from: %s" % newest_file)
     return source_date_epoch

 def find_git_folder(d, sourcedir):
     # First guess: WORKDIR/git
     # This is the default git fetcher unpack path
     workdir = d.getVar('WORKDIR')
     gitpath = os.path.join(workdir, "git/.git")
     if os.path.isdir(gitpath):
         return gitpath

     # Second guess: ${S}
     gitpath = os.path.join(sourcedir, ".git")
     if os.path.isdir(gitpath):
         return gitpath

     # Perhaps there was a subpath or destsuffix specified.
     # Go looking in the WORKDIR
     exclude = set(["build", "image", "license-destdir", "patches", "pseudo",
                    "recipe-sysroot", "recipe-sysroot-native", "sysroot-destdir", "temp"])
     for root, dirs, files in os.walk(workdir, topdown=True):
         dirs[:] = [d for d in dirs if d not in exclude]
         if '.git' in dirs:
             return os.path.join(root, ".git")

     bb.warn("Failed to find a git repository in WORKDIR: %s" % workdir)
     return None

 def get_source_date_epoch_from_git(d, sourcedir):
     if not "git://" in d.getVar('SRC_URI') and not "gitsm://" in d.getVar('SRC_URI'):
         return None

     gitpath = find_git_folder(d, sourcedir)
     if not gitpath:
         return None

     # Check that the repository has a valid HEAD; it may not if subdir is used
     # in SRC_URI
     p = subprocess.run(['git', '--git-dir', gitpath, 'rev-parse', 'HEAD'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
     if p.returncode != 0:
         bb.debug(1, "%s does not have a valid HEAD: %s" % (gitpath, p.stdout.decode('utf-8')))
         return None

     bb.debug(1, "git repository: %s" % gitpath)
     p = subprocess.run(['git', '--git-dir', gitpath, 'log', '-1', '--pretty=%ct'], check=True, stdout=subprocess.PIPE)
     return int(p.stdout.decode('utf-8'))

 def get_source_date_epoch_from_youngest_file(d, sourcedir):
     if sourcedir == d.getVar('WORKDIR'):
        # These sources are almost certainly not from a tarball
        return None

     # Do it the hard way: check all files and find the youngest one...
     source_date_epoch = None
     newest_file = None
     for root, dirs, files in os.walk(sourcedir, topdown=True):
         files = [f for f in files if not f[0] == '.']

         for fname in files:
             filename = os.path.join(root, fname)
             try:
                 mtime = int(os.lstat(filename).st_mtime)
             except ValueError:
                 mtime = 0
             if not source_date_epoch or mtime > source_date_epoch:
                 source_date_epoch = mtime
                 newest_file = filename

     if newest_file:
         bb.debug(1, "Newest file found: %s" % newest_file)
     return source_date_epoch

 def fixed_source_date_epoch(d):
     bb.debug(1, "No tarball or git repo found to determine SOURCE_DATE_EPOCH")
     source_date_epoch = d.getVar('SOURCE_DATE_EPOCH_FALLBACK')
     if source_date_epoch:
         bb.debug(1, "Using SOURCE_DATE_EPOCH_FALLBACK")
         return int(source_date_epoch)
     return 0

 def get_source_date_epoch(d, sourcedir):
     return (
         get_source_date_epoch_from_git(d, sourcedir) or
         get_source_date_epoch_from_known_files(d, sourcedir) or
         get_source_date_epoch_from_youngest_file(d, sourcedir) or
         fixed_source_date_epoch(d)       # Last resort
     )

 def epochfile_read(epochfile, d):
     cached, efile = d.getVar('__CACHED_SOURCE_DATE_EPOCH') or (None, None)
     if cached and efile == epochfile:
         return cached

     if cached and epochfile != efile:
         bb.debug(1, "Epoch file changed from %s to %s" % (efile, epochfile))

     source_date_epoch = int(d.getVar('SOURCE_DATE_EPOCH_FALLBACK'))
     try:
         with open(epochfile, 'r') as f:
             s = f.read()
             try:
                 source_date_epoch = int(s)
             except ValueError:
                 bb.warn("SOURCE_DATE_EPOCH value '%s' is invalid. Reverting to SOURCE_DATE_EPOCH_FALLBACK" % s)
                 source_date_epoch = int(d.getVar('SOURCE_DATE_EPOCH_FALLBACK'))
         bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
     except FileNotFoundError:
         bb.debug(1, "Cannot find %s. SOURCE_DATE_EPOCH will default to %d" % (epochfile, source_date_epoch))

     d.setVar('__CACHED_SOURCE_DATE_EPOCH', (str(source_date_epoch), epochfile))
     return str(source_date_epoch)

 def epochfile_write(source_date_epoch, epochfile, d):

     bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
     bb.utils.mkdirhier(os.path.dirname(epochfile))

     tmp_file = "%s.new" % epochfile
     with open(tmp_file, 'w') as f:
         f.write(str(source_date_epoch))
     os.rename(tmp_file, epochfile)
	#
	# SPDX-License-Identifier: GPL-2.0-only
	#
	import os
	import subprocess
	import bb

	# For reproducible builds, this code sets the default SOURCE_DATE_EPOCH in each
	# component's build environment. The format is number of seconds since the
	# system epoch.
	#
	# Upstream components (generally) respect this environment variable,
	# using it in place of the "current" date and time.
	# See https://reproducible-builds.org/specs/source-date-epoch/
	#
	# The default value of SOURCE_DATE_EPOCH comes from the function
	# get_source_date_epoch_value which reads from the SDE_FILE, or if the file
	# is not available will use the fallback of SOURCE_DATE_EPOCH_FALLBACK.
	#
	# The SDE_FILE is normally constructed from the function
	# create_source_date_epoch_stamp which is typically added as a postfuncs to
	# the do_unpack task. If a recipe does NOT have do_unpack, it should be added
	# to a task that runs after the source is available and before the
	# do_deploy_source_date_epoch task is executed.
	#
	# If a recipe wishes to override the default behavior it should set it's own
	# SOURCE_DATE_EPOCH or override the do_deploy_source_date_epoch_stamp task
	# with recipe-specific functionality to write the appropriate
	# SOURCE_DATE_EPOCH into the SDE_FILE.
	#
	# SOURCE_DATE_EPOCH is intended to be a reproducible value. This value should
	# be reproducible for anyone who builds the same revision from the same
	# sources.
	#
	# There are 4 ways the create_source_date_epoch_stamp function determines what
	# becomes SOURCE_DATE_EPOCH:
	#
	# 1. Use the value from __source_date_epoch.txt file if this file exists.
	# This file was most likely created in the previous build by one of the
	# following methods 2,3,4.
	# Alternatively, it can be provided by a recipe via SRC_URI.
	#
	# If the file does not exist:
	#
	# 2. If there is a git checkout, use the last git commit timestamp.
	# Git does not preserve file timestamps on checkout.
	#
	# 3. Use the mtime of "known" files such as NEWS, CHANGLELOG, ...
	# This works for well-kept repositories distributed via tarball.
	#
	# 4. Use the modification time of the youngest file in the source tree, if
	# there is one.
	# This will be the newest file from the distribution tarball, if any.
	#
	# 5. Fall back to a fixed timestamp (SOURCE_DATE_EPOCH_FALLBACK).
	#
	# Once the value is determined, it is stored in the recipe's SDE_FILE.

	def get_source_date_epoch_from_known_files(d, sourcedir):
	source_date_epoch = None
	newest_file = None
	known_files = set(["NEWS", "ChangeLog", "Changelog", "CHANGES"])
	for file in known_files:
	filepath = os.path.join(sourcedir, file)
	if os.path.isfile(filepath):
	mtime = int(os.lstat(filepath).st_mtime)
	# There may be more than one "known_file" present, if so, use the youngest one
	if not source_date_epoch or mtime > source_date_epoch:
	source_date_epoch = mtime
	newest_file = filepath
	if newest_file:
	bb.debug(1, "SOURCE_DATE_EPOCH taken from: %s" % newest_file)
	return source_date_epoch

	def find_git_folder(d, sourcedir):
	# First guess: WORKDIR/git
	# This is the default git fetcher unpack path
	workdir = d.getVar('WORKDIR')
	gitpath = os.path.join(workdir, "git/.git")
	if os.path.isdir(gitpath):
	return gitpath

	# Second guess: ${S}
	gitpath = os.path.join(sourcedir, ".git")
	if os.path.isdir(gitpath):
	return gitpath

	# Perhaps there was a subpath or destsuffix specified.
	# Go looking in the WORKDIR
	exclude = set(["build", "image", "license-destdir", "patches", "pseudo",
	"recipe-sysroot", "recipe-sysroot-native", "sysroot-destdir", "temp"])
	for root, dirs, files in os.walk(workdir, topdown=True):
	dirs[:] = [d for d in dirs if d not in exclude]
	if '.git' in dirs:
	return os.path.join(root, ".git")

	bb.warn("Failed to find a git repository in WORKDIR: %s" % workdir)
	return None

	def get_source_date_epoch_from_git(d, sourcedir):
	if not "git://" in d.getVar('SRC_URI') and not "gitsm://" in d.getVar('SRC_URI'):
	return None

	gitpath = find_git_folder(d, sourcedir)
	if not gitpath:
	return None

	# Check that the repository has a valid HEAD; it may not if subdir is used
	# in SRC_URI
	p = subprocess.run(['git', '--git-dir', gitpath, 'rev-parse', 'HEAD'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
	if p.returncode != 0:
	bb.debug(1, "%s does not have a valid HEAD: %s" % (gitpath, p.stdout.decode('utf-8')))
	return None

	bb.debug(1, "git repository: %s" % gitpath)
	p = subprocess.run(['git', '--git-dir', gitpath, 'log', '-1', '--pretty=%ct'], check=True, stdout=subprocess.PIPE)
	return int(p.stdout.decode('utf-8'))

	def get_source_date_epoch_from_youngest_file(d, sourcedir):
	if sourcedir == d.getVar('WORKDIR'):
	# These sources are almost certainly not from a tarball
	return None

	# Do it the hard way: check all files and find the youngest one...
	source_date_epoch = None
	newest_file = None
	for root, dirs, files in os.walk(sourcedir, topdown=True):
	files = [f for f in files if not f[0] == '.']

	for fname in files:
	filename = os.path.join(root, fname)
	try:
	mtime = int(os.lstat(filename).st_mtime)
	except ValueError:
	mtime = 0
	if not source_date_epoch or mtime > source_date_epoch:
	source_date_epoch = mtime
	newest_file = filename

	if newest_file:
	bb.debug(1, "Newest file found: %s" % newest_file)
	return source_date_epoch

	def fixed_source_date_epoch(d):
	bb.debug(1, "No tarball or git repo found to determine SOURCE_DATE_EPOCH")
	source_date_epoch = d.getVar('SOURCE_DATE_EPOCH_FALLBACK')
	if source_date_epoch:
	bb.debug(1, "Using SOURCE_DATE_EPOCH_FALLBACK")
	return int(source_date_epoch)
	return 0

	def get_source_date_epoch(d, sourcedir):
	return (
	get_source_date_epoch_from_git(d, sourcedir) or
	get_source_date_epoch_from_known_files(d, sourcedir) or
	get_source_date_epoch_from_youngest_file(d, sourcedir) or
	fixed_source_date_epoch(d) # Last resort
	)

	def epochfile_read(epochfile, d):
	cached, efile = d.getVar('__CACHED_SOURCE_DATE_EPOCH') or (None, None)
	if cached and efile == epochfile:
	return cached

	if cached and epochfile != efile:
	bb.debug(1, "Epoch file changed from %s to %s" % (efile, epochfile))

	source_date_epoch = int(d.getVar('SOURCE_DATE_EPOCH_FALLBACK'))
	try:
	with open(epochfile, 'r') as f:
	s = f.read()
	try:
	source_date_epoch = int(s)
	except ValueError:
	bb.warn("SOURCE_DATE_EPOCH value '%s' is invalid. Reverting to SOURCE_DATE_EPOCH_FALLBACK" % s)
	source_date_epoch = int(d.getVar('SOURCE_DATE_EPOCH_FALLBACK'))
	bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
	except FileNotFoundError:
	bb.debug(1, "Cannot find %s. SOURCE_DATE_EPOCH will default to %d" % (epochfile, source_date_epoch))

	d.setVar('__CACHED_SOURCE_DATE_EPOCH', (str(source_date_epoch), epochfile))
	return str(source_date_epoch)

	def epochfile_write(source_date_epoch, epochfile, d):

	bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
	bb.utils.mkdirhier(os.path.dirname(epochfile))

	tmp_file = "%s.new" % epochfile
	with open(tmp_file, 'w') as f:
	f.write(str(source_date_epoch))
	os.rename(tmp_file, epochfile)