Add script for gsi_pubsign build chaining target

Bug: 149803895
Test: ./gsi-pubsign-release.sh aosp_arm64 aosp_arm64_pubsign \
        aosp_arm64-artifact_path aosp_arm64_pubsign-artifact_path

Merged-In: I05e82f0605eec33c0da9b5a5d5cbf3506af3706c
Change-Id: I05e82f0605eec33c0da9b5a5d5cbf3506af3706c
(cherry picked from commit 45c81a65e7)

gsi/gsi-pubsign-release.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+
+set -e
+
+function usage {
+  cat <<EOF
+Usage: $0 src_product target_product src_dir [dist_dir]
+
+Create artifacts for |target_product| from the artifacts of |src_product|.
+
+src_product
+        Product name to copy artifacts from. e.g. aosp_arm64
+
+target_product
+        Product name to copy artifacts to. e.g. aosp_arm64_pubsign
+
+src_dir
+        Directory containing source artifacts.
+
+dist_dir
+        Optional. If given then generate any artifact under dist_dir.
+        Otherwise generate under environment variable DIST_DIR.
+EOF
+}
+
+if [[ $# -lt 3 ]]; then
+  usage
+  exit 1
+fi
+
+SRC_PRODUCT="$1"
+TARGET_PRODUCT="$2"
+SRC_DIR="$3"
+
+if [[ $# -ge 4 ]]; then
+  DIST_DIR="$4"
+fi
+
+readonly SRC_PRODUCT
+readonly TARGET_PRODUCT
+readonly SRC_DIR
+readonly DIST_DIR
+
+if [[ -z "${DIST_DIR}" ]]; then
+  echo >&2 '$DIST_DIR is not specified'
+  exit 1
+fi
+
+# Create output directory if not already present
+if [[ ! -d "${DIST_DIR}" ]]; then
+  mkdir -p "${DIST_DIR}"
+fi
+
+# Don't copy logs/ and files whose name starts with $SRC_PRODUCT
+rsync --verbose --archive --copy-links --exclude='logs' \
+  --exclude="${SRC_PRODUCT}-*" "${SRC_DIR}" "${DIST_DIR}"
+
+# Rename ${SRC_PRODUCT}-xxx.yyy to ${TARGET_PRODUCT}-xxx.yyy
+for src_path in $(find "${SRC_DIR}" -type f -name "${SRC_PRODUCT}-*") ; do
+  src_file="$(basename ${src_path})"
+  target_file="${src_file/${SRC_PRODUCT}/${TARGET_PRODUCT}}"
+  cp -v "${src_path}" "${DIST_DIR}/${target_file}"
+done