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- # reproducible_build.bbclass
- #
- # Sets SOURCE_DATE_EPOCH in each component's build environment.
- # 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/
- #
- # After sources are unpacked but before they are patched, we set a reproducible value for SOURCE_DATE_EPOCH.
- # This value should be reproducible for anyone who builds the same revision from the same sources.
- #
- # There are 4 ways we determine 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.
- #
- # Once the value of SOURCE_DATE_EPOCH is determined, it is stored in the recipe's SDE_FILE.
- # If none of these mechanisms are suitable, replace the do_deploy_source_date_epoch task
- # with recipe-specific functionality to write the appropriate SOURCE_DATE_EPOCH into the SDE_FILE.
- #
- # If this file is found by other tasks, the value is exported in the SOURCE_DATE_EPOCH variable.
- # SOURCE_DATE_EPOCH is set for all tasks that might use it (do_configure, do_compile, do_package, ...)
- BUILD_REPRODUCIBLE_BINARIES ??= '1'
- inherit ${@oe.utils.ifelse(d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1', 'reproducible_build_simple', '')}
- SDE_DIR ="${WORKDIR}/source-date-epoch"
- SDE_FILE = "${SDE_DIR}/__source_date_epoch.txt"
- SDE_DEPLOYDIR = "${WORKDIR}/deploy-source-date-epoch"
- SSTATETASKS += "do_deploy_source_date_epoch"
- do_deploy_source_date_epoch () {
- mkdir -p ${SDE_DEPLOYDIR}
- if [ -e ${SDE_FILE} ]; then
- echo "Deploying SDE from ${SDE_FILE} -> ${SDE_DEPLOYDIR}."
- cp -p ${SDE_FILE} ${SDE_DEPLOYDIR}/__source_date_epoch.txt
- else
- echo "${SDE_FILE} not found!"
- fi
- }
- python do_deploy_source_date_epoch_setscene () {
- sstate_setscene(d)
- bb.utils.mkdirhier(d.getVar('SDE_DIR'))
- sde_file = os.path.join(d.getVar('SDE_DEPLOYDIR'), '__source_date_epoch.txt')
- if os.path.exists(sde_file):
- target = d.getVar('SDE_FILE')
- bb.debug(1, "Moving setscene SDE file %s -> %s" % (sde_file, target))
- os.rename(sde_file, target)
- else:
- bb.debug(1, "%s not found!" % sde_file)
- }
- do_deploy_source_date_epoch[dirs] = "${SDE_DEPLOYDIR}"
- do_deploy_source_date_epoch[sstate-plaindirs] = "${SDE_DEPLOYDIR}"
- addtask do_deploy_source_date_epoch_setscene
- addtask do_deploy_source_date_epoch before do_configure after do_patch
- python create_source_date_epoch_stamp() {
- import oe.reproducible
- epochfile = d.getVar('SDE_FILE')
- # If it exists we need to regenerate as the sources may have changed
- if os.path.isfile(epochfile):
- bb.debug(1, "Deleting existing SOURCE_DATE_EPOCH from: %s" % epochfile)
- os.remove(epochfile)
- source_date_epoch = oe.reproducible.get_source_date_epoch(d, d.getVar('S'))
- bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
- bb.utils.mkdirhier(d.getVar('SDE_DIR'))
- with open(epochfile, 'w') as f:
- f.write(str(source_date_epoch))
- }
- def get_source_date_epoch_value(d):
- cached = d.getVar('__CACHED_SOURCE_DATE_EPOCH')
- if cached:
- return cached
- epochfile = d.getVar('SDE_FILE')
- source_date_epoch = 0
- if os.path.isfile(epochfile):
- 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 0" % s)
- source_date_epoch = 0
- bb.debug(1, "SOURCE_DATE_EPOCH: %d" % source_date_epoch)
- else:
- 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))
- return str(source_date_epoch)
- export SOURCE_DATE_EPOCH ?= "${@get_source_date_epoch_value(d)}"
- BB_HASHBASE_WHITELIST += "SOURCE_DATE_EPOCH"
- python () {
- if d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1':
- d.appendVarFlag("do_unpack", "postfuncs", " create_source_date_epoch_stamp")
- }
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