Added vars RANDOM_SEED, LIBFAKETIME_PATH + misc.

All environment variables necessary for creating reproducible builds
should now be present.  If libfaketime is not linked then the only
reproducibility-related variables SOURCE_DATE_EPOCH and RANDOM_SEED (gcc
flag -frandom-seed) will be used.  -frandom-seed will be added in a
later commit.

2 files changed, 33 insertions, 14 deletions

diff --git a/libreboot b/libreboot
index f02de202..a89b78e5 100755
--- a/libreboot
+++ b/libreboot
@@ -63,6 +63,7 @@ libreboot_usage() {
 	printf "  TOOLS_FORCE - Tools to always perform actions for\n" >&2
 	printf "  RELEASE_KEY - GPG key to use for release\n" >&2
 	printf "  VBOOT_KEYS_PATH - Path to the vboot keys\n" >&2
+	printf "  LIBFAKETIME_PATH - Path to the libfaketime shared library\n" >&2
 	printf "  TASKS - Number of simultaneous tasks to run\n" >&2
 	printf "  VERSION - Version string to use\n" >&2
 
@@ -172,21 +173,18 @@ libreboot_setup_variables() {
 	local vboot_tools_path="$(project_install_path 'vboot' 'tools')"
 	local version_path="${root}/${DOTVERSION}"
 	local epoch_path="${root}/${DOTEPOCH}"
+	local rnd_seed_path="${root}/${DOTRNDSEED}"
 
-	if [[ -z "${TASKS}" ]]; then
-		TASKS=1
-	fi
-
-	if [[ -z "${VERSION}" ]]; then
-		if git_check "${root}"; then
-			VERSION="${BUILD_SYSTEM}-$(git_describe "${root}" 2> /dev/null || echo 'git')"
-		elif [[ -f "${version_path}" ]]; then
-			VERSION="$(cat "${version_path}")"
+	# Used by GCC, e.g., -frandom-seed="${RANDOM_SEED}"
+	if [[ -z "${RANDOM_SEED}" ]]; then
+		if [[ -f "${rnd_seed_path}" ]]; then
+			RANDOM_SEED="$(cat "${rnd_seed_path}")"
 		else
-			VERSION="${BUILD_SYSTEM}"
+			RANDOM_SEED="${RANDOM}" # True randomness is unnecessary
 		fi
 	fi
 
+	# Also used by GCC, but as an environment variable
 	if [[ -z "${SOURCE_DATE_EPOCH}" ]]; then
 		if git_check "${root}"; then
 			SOURCE_DATE_EPOCH="$(git log -1 --format=%ct)"
@@ -197,12 +195,32 @@ libreboot_setup_variables() {
 		fi
 	fi
 
-	if [[ -z "${VBOOT_KEYS_PATH}" ]] && [[ -d "${vboot_tools_path}/devkeys/" ]]; then
-		VBOOT_KEYS_PATH="${vboot_tools_path}/devkeys/"
+	if [[ -z "${VERSION}" ]]; then
+		if git_check "${root}"; then
+			VERSION="${BUILD_SYSTEM}-$(git_describe "${root}" 2> /dev/null || echo 'git')"
+		elif [[ -f "${version_path}" ]]; then
+			VERSION="$(cat "${version_path}")"
+		else
+			VERSION="${BUILD_SYSTEM}"
+		fi
+	fi
+
+	if [[ -d "${vboot_tools_path}/devkeys/" ]]; then
+		VBOOT_KEYS_PATH="${VBOOT_KEYS_PATH:-${vboot_tools_path}/devkeys/}"
 	fi
 
-	if [[ -z "${EDITOR}" ]]; then
-		EDITOR="vi"
+	CONFIG_SHELL="${CONFIG_SHELL:-$(which bash)}"
+	EDITOR="${EDITOR:-$(which vi || true)}"
+	TASKS="${TASKS:-1}"
+
+	# Environment variables useful for creating reproducible builds
+	if [[ -n "${LIBFAKETIME_PATH}" ]]; then
+		BUILD_DATE_FMT="%Y-%m-%d %H:%M:%S"
+		BUILD_DATE="$(date -u -d "@${SOURCE_DATE_EPOCH}" "+${BUILD_DATE_FMT}" 2>/dev/null || date -u -r "${SOURCE_DATE_EPOCH}" "+${BUILD_DATE_FMT}" 2>/dev/null || date -u "+${BUILD_DATE_FMT}")"
+		FAKETIME="@${BUILD_DATE}"
+		LC_ALL='C.UTF-8'
+		LD_PRELOAD="${LIBFAKETIME_PATH}"
+		TZ='UTC'
 	fi
 }
 
diff --git a/libs/common b/libs/common
index 8f1379ee..281728bc 100755
--- a/libs/common
+++ b/libs/common
@@ -35,6 +35,7 @@ BLOBS_IGNORE="blobs-ignore"
 BLOBS_DISCOVER="blobs-discover"
 
 DOTEPOCH=".epoch"
+DOTRNDSEED=".rndseed"
 DOTVERSION=".version"
 DOTREVISION=".revision"
 DOTTARFILES=".tarfiles"