diff options
Diffstat (limited to 'meta/classes/reproducible_build.bbclass')
| -rw-r--r-- | meta/classes/reproducible_build.bbclass | 53 |
1 files changed, 34 insertions, 19 deletions
diff --git a/meta/classes/reproducible_build.bbclass b/meta/classes/reproducible_build.bbclass index 378121903d..96bb012243 100644 --- a/meta/classes/reproducible_build.bbclass +++ b/meta/classes/reproducible_build.bbclass @@ -1,17 +1,38 @@ # reproducible_build.bbclass # -# Sets SOURCE_DATE_EPOCH in each component's build environment. +# 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/ # -# 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. +# 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 (or set to 0) 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 we determine SOURCE_DATE_EPOCH: +# 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. +# 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: @@ -22,20 +43,16 @@ # 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. +# 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. +# 5. Fall back to a fixed timestamp (SOURCE_DATE_EPOCH_FALLBACK). # -# 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, ...) +# Once the value is determined, it is stored in the recipe's SDE_FILE. BUILD_REPRODUCIBLE_BINARIES ??= '1' -inherit ${@oe.utils.ifelse(d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1', 'reproducible_build_simple', '')} +inherit reproducible_build_simple SDE_DIR = "${WORKDIR}/source-date-epoch" SDE_FILE = "${SDE_DIR}/__source_date_epoch.txt" @@ -92,6 +109,9 @@ python create_source_date_epoch_stamp() { os.rename(tmp_file, epochfile) } +# Generate the stamp after do_unpack runs +do_unpack[postfuncs] += "create_source_date_epoch_stamp" + def get_source_date_epoch_value(d): cached = d.getVar('__CACHED_SOURCE_DATE_EPOCH') if cached: @@ -120,8 +140,3 @@ def get_source_date_epoch_value(d): export SOURCE_DATE_EPOCH ?= "${@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") -} |