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-rw-r--r--meta/classes/reproducible_build.bbclass53
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 @@
1# reproducible_build.bbclass 1# reproducible_build.bbclass
2# 2#
3# Sets SOURCE_DATE_EPOCH in each component's build environment. 3# Sets the default SOURCE_DATE_EPOCH in each component's build environment.
4# The format is number of seconds since the system epoch.
5#
4# Upstream components (generally) respect this environment variable, 6# Upstream components (generally) respect this environment variable,
5# using it in place of the "current" date and time. 7# using it in place of the "current" date and time.
6# See https://reproducible-builds.org/specs/source-date-epoch/ 8# See https://reproducible-builds.org/specs/source-date-epoch/
7# 9#
8# After sources are unpacked but before they are patched, we set a reproducible value for SOURCE_DATE_EPOCH. 10# The default value of SOURCE_DATE_EPOCH comes from the function
9# This value should be reproducible for anyone who builds the same revision from the same sources. 11# get_source_date_epoch_value which reads from the SDE_FILE, or if the file
12# is not available (or set to 0) will use the fallback of
13# SOURCE_DATE_EPOCH_FALLBACK.
14#
15# The SDE_FILE is normally constructed from the function
16# create_source_date_epoch_stamp which is typically added as a postfuncs to
17# the do_unpack task. If a recipe does NOT have do_unpack, it should be added
18# to a task that runs after the source is available and before the
19# do_deploy_source_date_epoch task is executed.
20#
21# If a recipe wishes to override the default behavior it should set it's own
22# SOURCE_DATE_EPOCH or override the do_deploy_source_date_epoch_stamp task
23# with recipe-specific functionality to write the appropriate
24# SOURCE_DATE_EPOCH into the SDE_FILE.
25#
26# SOURCE_DATE_EPOCH is intended to be a reproducible value. This value should
27# be reproducible for anyone who builds the same revision from the same
28# sources.
10# 29#
11# There are 4 ways we determine SOURCE_DATE_EPOCH: 30# There are 4 ways the create_source_date_epoch_stamp function determines what
31# becomes SOURCE_DATE_EPOCH:
12# 32#
13# 1. Use the value from __source_date_epoch.txt file if this file exists. 33# 1. Use the value from __source_date_epoch.txt file if this file exists.
14# This file was most likely created in the previous build by one of the following methods 2,3,4. 34# This file was most likely created in the previous build by one of the
35# following methods 2,3,4.
15# Alternatively, it can be provided by a recipe via SRC_URI. 36# Alternatively, it can be provided by a recipe via SRC_URI.
16# 37#
17# If the file does not exist: 38# If the file does not exist:
@@ -22,20 +43,16 @@
22# 3. Use the mtime of "known" files such as NEWS, CHANGLELOG, ... 43# 3. Use the mtime of "known" files such as NEWS, CHANGLELOG, ...
23# This works for well-kept repositories distributed via tarball. 44# This works for well-kept repositories distributed via tarball.
24# 45#
25# 4. Use the modification time of the youngest file in the source tree, if there is one. 46# 4. Use the modification time of the youngest file in the source tree, if
47# there is one.
26# This will be the newest file from the distribution tarball, if any. 48# This will be the newest file from the distribution tarball, if any.
27# 49#
28# 5. Fall back to a fixed timestamp. 50# 5. Fall back to a fixed timestamp (SOURCE_DATE_EPOCH_FALLBACK).
29# 51#
30# Once the value of SOURCE_DATE_EPOCH is determined, it is stored in the recipe's SDE_FILE. 52# Once the value is determined, it is stored in the recipe's SDE_FILE.
31# If none of these mechanisms are suitable, replace the do_deploy_source_date_epoch task
32# with recipe-specific functionality to write the appropriate SOURCE_DATE_EPOCH into the SDE_FILE.
33#
34# If this file is found by other tasks, the value is exported in the SOURCE_DATE_EPOCH variable.
35# SOURCE_DATE_EPOCH is set for all tasks that might use it (do_configure, do_compile, do_package, ...)
36 53
37BUILD_REPRODUCIBLE_BINARIES ??= '1' 54BUILD_REPRODUCIBLE_BINARIES ??= '1'
38inherit ${@oe.utils.ifelse(d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1', 'reproducible_build_simple', '')} 55inherit reproducible_build_simple
39 56
40SDE_DIR = "${WORKDIR}/source-date-epoch" 57SDE_DIR = "${WORKDIR}/source-date-epoch"
41SDE_FILE = "${SDE_DIR}/__source_date_epoch.txt" 58SDE_FILE = "${SDE_DIR}/__source_date_epoch.txt"
@@ -92,6 +109,9 @@ python create_source_date_epoch_stamp() {
92 os.rename(tmp_file, epochfile) 109 os.rename(tmp_file, epochfile)
93} 110}
94 111
112# Generate the stamp after do_unpack runs
113do_unpack[postfuncs] += "create_source_date_epoch_stamp"
114
95def get_source_date_epoch_value(d): 115def get_source_date_epoch_value(d):
96 cached = d.getVar('__CACHED_SOURCE_DATE_EPOCH') 116 cached = d.getVar('__CACHED_SOURCE_DATE_EPOCH')
97 if cached: 117 if cached:
@@ -120,8 +140,3 @@ def get_source_date_epoch_value(d):
120 140
121export SOURCE_DATE_EPOCH ?= "${@get_source_date_epoch_value(d)}" 141export SOURCE_DATE_EPOCH ?= "${@get_source_date_epoch_value(d)}"
122BB_HASHBASE_WHITELIST += "SOURCE_DATE_EPOCH" 142BB_HASHBASE_WHITELIST += "SOURCE_DATE_EPOCH"
123
124python () {
125 if d.getVar('BUILD_REPRODUCIBLE_BINARIES') == '1':
126 d.appendVarFlag("do_unpack", "postfuncs", " create_source_date_epoch_stamp")
127}