[ptxdist] [PATCH v2 1/4] config/setup: make reproducible builds configurable

["Baeuerle, Florian" <Florian.Baeuerle@allegion.com>]

Some of ptxdist's packages use SOURCE_DATE_EPOCH to make the build
results predictable. Make this behaviour more configurable via a newly
introduced ptxdist setup options.

By default, this will set SOURCE_DATE_EPOCH to the year and month of the
used OSELAS Toolchain version. If the used toolchain is not an
OSELAS-Toolchain, the PTXdist version is used as a fallback.

Signed-off-by: Florian Bäuerle <florian.baeuerle@allegion.com>
---
 config/setup/Kconfig                 | 47 ++++++++++++++++++++++++++
 config/setup/ptxdistrc.default       |  5 +++
 scripts/lib/ptxd_lib_reproducible.sh | 49 +++++++++++++++++++++++++++-
 3 files changed, 100 insertions(+), 1 deletion(-)

diff --git a/config/setup/Kconfig b/config/setup/Kconfig
index 990da03a1..10adb970d 100644
--- a/config/setup/Kconfig
+++ b/config/setup/Kconfig
@@ -264,6 +264,53 @@ config SETUP_DISABLE_LOCAL_CHECK
 	  may fail under certain circumstances.
 	  Disable this check at your own risk.
 
+config SETUP_DISABLE_REPRODUCIBLE
+	bool
+	prompt "disable reproducible builds"
+	help
+	  By default ptxdist will build some packages in a
+	  reproducible way by injecting fake timestamps, user and
+	  host name into the build.
+
+if !SETUP_DISABLE_REPRODUCIBLE
+
+choice
+	prompt "Fake timestamps source"
+	default SETUP_REPRODUCIBLE_TIMESTAMP_TOOLCHAIN
+
+	config SETUP_REPRODUCIBLE_TIMESTAMP_TOOLCHAIN
+		bool
+		prompt "toolchain version"
+
+	config SETUP_REPRODUCIBLE_TIMESTAMP_PTXDIST
+		bool
+		prompt "ptxdist version"
+
+	config SETUP_REPRODUCIBLE_TIMESTAMP_CUSTOM
+		bool
+		prompt "custom timestamp"
+
+endchoice
+
+config SETUP_REPRODUCIBLE_TIMESTAMP
+	string
+	default "toolchain" if SETUP_REPRODUCIBLE_TIMESTAMP_TOOLCHAIN
+	default "ptxdist" if SETUP_REPRODUCIBLE_TIMESTAMP_PTXDIST
+	default "custom" if SETUP_REPRODUCIBLE_TIMESTAMP_CUSTOM
+
+if SETUP_REPRODUCIBLE_TIMESTAMP_CUSTOM
+
+config SETUP_REPRODUCIBLE_TIMESTAMP_STRING
+	string
+	prompt "Fake timestamp"
+	default "2018-11-01 UTC"
+	help
+	  Supply a custom fake timestamp to be injected to the build.
+	  The timestamp is passed to 'date --date'.
+
+endif
+endif
+
 config SETUP_ENV_WHITELIST
 	string "environment variable whitelist (space separated)"
 	help
diff --git a/config/setup/ptxdistrc.default b/config/setup/ptxdistrc.default
index 397b78eb7..8aa7dcc9a 100644
--- a/config/setup/ptxdistrc.default
+++ b/config/setup/ptxdistrc.default
@@ -61,6 +61,11 @@ PTXCONF_SETUP_JAVA_SDK="/usr/lib/jvm/default-java"
 # Developer Options 
 #
 # PTXCONF_SETUP_DISABLE_LOCAL_CHECK is not set
+# PTXCONF_SETUP_DISABLE_REPRODUCIBLE is not set
+PTXCONF_SETUP_REPRODUCIBLE_TIMESTAMP_TOOLCHAIN=y
+# PTXCONF_SETUP_REPRODUCIBLE_TIMESTAMP_PTXDIST is not set
+# PTXCONF_SETUP_REPRODUCIBLE_TIMESTAMP_CUSTOM is not set
+PTXCONF_SETUP_REPRODUCIBLE_TIMESTAMP="toolchain"
 PTXCONF_SETUP_ENV_WHITELIST=""
 # PTXCONF_SETUP_COMMON_CACHE is not set
 # PTXCONF_SETUP_GEN_DEP_TREE is not set
diff --git a/scripts/lib/ptxd_lib_reproducible.sh b/scripts/lib/ptxd_lib_reproducible.sh
index e2e664ba8..98c528ac2 100644
--- a/scripts/lib/ptxd_lib_reproducible.sh
+++ b/scripts/lib/ptxd_lib_reproducible.sh
@@ -8,8 +8,55 @@
 # see the README file.
 #
 
+ptxd_timestamp_ptxdist() {
+    ptxd_reply="${PTXDIST_VERSION_YEAR}-${PTXDIST_VERSION_MONTH}-01 UTC"
+}
+
+ptxd_timestamp_toolchain() {
+    local oselas_ptxconfig="$(readlink -f "${PTXDIST_TOOLCHAIN}/ptxconfig")"
+
+    if [ -e "${oselas_ptxconfig}" ]; then
+        local oselas_version="$(source "${oselas_ptxconfig}" && echo ${PTXCONF_CONFIGFILE_VERSION})"
+        local orig_IFS="${IFS}"
+        local IFS="."
+        set -- ${oselas_version}
+        IFS="${orig_IFS}"
+        ptxd_reply="${1}-${2}-01 UTC"
+    else
+        echo "${PTXDIST_LOG_PROMPT}warning: cannot deduce timestamp from toolchain, falling back to PTXdist version for reproducible timestamp"
+        ptxd_timestamp_ptxdist
+    fi
+}
+
+ptxd_timestamp_custom() {
+    local ts="${PTXCONF_SETUP_REPRODUCIBLE_TIMESTAMP_STRING}"
+
+    if ! date --date "${ts}" > /dev/null 2>&1; then
+        echo "${PTXDIST_LOG_PROMPT}warning: '${ts}' is not a valid timestamp, falling back to toolchain for reproducible timestamp"
+        ptxd_timestamp_toolchain
+    else
+        ptxd_reply="${ts}"
+    fi
+}
+
 ptxd_lib_reproducible() {
-    SOURCE_DATE_EPOCH="$(echo $(date --date="${PTXDIST_VERSION_YEAR}-${PTXDIST_VERSION_MONTH}-01 UTC" "+%s"))"
+    if [ "${PTXCONF_SETUP_DISABLE_REPRODUCIBLE}" = "y" ]; then
+        ptxd_timestamp_ptxdist
+    else
+        case "${PTXCONF_SETUP_REPRODUCIBLE_TIMESTAMP}" in
+            "custom")
+                ptxd_timestamp_custom
+                ;;
+            "ptxdist")
+                ptxd_timestamp_ptxdist
+                ;;
+            *)
+                ptxd_timestamp_toolchain
+                ;;
+        esac
+    fi
+
+    SOURCE_DATE_EPOCH="$(echo $(date --date="${ptxd_reply}" "+%s"))"
     export SOURCE_DATE_EPOCH
 
     PTXDIST_BUILD_TIMESTAMP="$(echo $(date --utc --date @${SOURCE_DATE_EPOCH} +%Y-%m-%dT%H:%M+0000))"
-- 
2.19.2

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