Create a random `-keypair.json` file alongside the program deploy artifact for easy upgrades

Cargo.lock

@@ -3841,6 +3841,7 @@ version = "1.6.0"
 dependencies = [
  "cargo_metadata",
  "clap",
+ "solana-sdk",
 ]
 
 [[package]]

sdk/cargo-build-bpf/Cargo.toml

@@ -12,6 +12,7 @@ publish = false
 [dependencies]
 clap = "2.33.3"
 cargo_metadata = "0.12.0"
+solana-sdk = { path = "..", version = "1.6.0" }
 
 [features]
 program = []

sdk/cargo-build-bpf/src/main.rs

@@ -1,13 +1,16 @@
-use clap::{
-    crate_description, crate_name, crate_version, value_t, value_t_or_exit, values_t, App, Arg,
-};
-use std::{
-    env,
-    ffi::OsStr,
-    fs,
-    path::{Path, PathBuf},
-    process::exit,
-    process::Command,
+use {
+    clap::{
+        crate_description, crate_name, crate_version, value_t, value_t_or_exit, values_t, App, Arg,
+    },
+    solana_sdk::signature::{write_keypair_file, Keypair},
+    std::{
+        env,
+        ffi::OsStr,
+        fs,
+        path::{Path, PathBuf},
+        process::exit,
+        process::Command,
+    },
 };
 
 struct Config {
@@ -166,6 +169,7 @@ fn build_bpf_package(
         let program_unstripped_so = target_build_directory.join(&format!("{}.so", program_name));
         let program_dump = bpf_out_dir.join(&format!("{}-dump.txt", program_name));
         let program_so = bpf_out_dir.join(&format!("{}.so", program_name));
+        let program_keypair = bpf_out_dir.join(&format!("{}-keypair.json", program_name));
 
         fn file_older_or_missing(prerequisite_file: &Path, target_file: &Path) -> bool {
             let prerequisite_metadata = fs::metadata(prerequisite_file).unwrap_or_else(|err| {
@@ -186,6 +190,17 @@ fn build_bpf_package(
             }
         }
 
+        if !program_keypair.exists() {
+            write_keypair_file(&Keypair::new(), &program_keypair).unwrap_or_else(|err| {
+                eprintln!(
+                    "Unable to get create {}: {}",
+                    program_keypair.display(),
+                    err
+                );
+                exit(1);
+            });
+        }
+
         if file_older_or_missing(&program_unstripped_so, &program_so) {
             spawn(
                 &config.bpf_sdk.join("scripts/strip.sh"),