Set -u (error on unset) in all script files

This is a pretty common flag to reduce errors. Make use of it here.

ci/android-install-ndk.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-set -ex
+set -eux
 
 ndk=android-ndk-r27
 wget --tries=20 -q "https://dl.google.com/android/repository/${ndk}-linux.zip"

ci/android-install-sdk.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-set -ex
+set -eux
 
 # Prep the SDK and emulator
 #

ci/android-sysimage.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -ex
+set -eux
 
 URL=https://dl.google.com/android/repository/sys-img/android
 

ci/build.sh

@@ -5,7 +5,7 @@
 # The FILTER environment variable can be used to select which target(s) to build.
 # For example: set FILTER to vxworks to select the targets that has vxworks in name
 
-set -ex
+set -eux
 
 : "${TOOLCHAIN?The TOOLCHAIN environment variable must be set.}"
 : "${OS?The OS environment variable must be set.}"

ci/docker/wasm32-unknown-emscripten/node-wrapper.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -e
+set -eux
 
 me="$1"
 shift

ci/emscripten-entry.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -ex
+set -eux
 
 # shellcheck disable=SC1091
 source /emsdk-portable/emsdk_env.sh &> /dev/null

ci/emscripten.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -ex
+set -eux
 
 # Note: keep in sync with:
 # https://github.com/rust-lang/rust/blob/master/src/ci/docker/scripts/emscripten.sh

ci/install-musl.sh

@@ -3,7 +3,7 @@
 # Install musl and musl-sanitized linux kernel headers
 # to musl-{$1} directory
 
-set -ex
+set -eux
 
 musl_version=1.1.24
 musl="musl-${musl_version}"

ci/install-rust.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env sh
 # This is intended to be used in CI only.
 
-set -ex
+set -eux
 
 echo "Setup toolchain"
 toolchain=

ci/linux-s390x.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-set -ex
+set -eux
 
 mkdir -m 777 /qemu
 cd /qemu

ci/linux-sparc64.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
-set -ex
+set -eux
 
 mkdir -m 777 /qemu
 cd /qemu

ci/run-docker.sh

@@ -6,7 +6,7 @@
 # Small script to run tests for a target (or all targets) inside all the
 # respective docker images.
 
-set -ex
+set -eux
 
 # Default to assuming the CARGO_HOME is one directory up (to account for a `bin`
 # subdir) from where the `cargo` binary in `$PATH` lives.

ci/run.sh

@@ -3,7 +3,7 @@
 # Builds and runs tests for a particular target passed as an argument to this
 # script.
 
-set -ex
+set -eux
 
 mirrors_url="https://ci-mirrors.rust-lang.org/libc"
 

ci/style.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -ex
+set -eux
 
 rustc ci/style.rs && ./style src
 

ci/test-runner-linux

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -e
+set -eux
 
 arch="$1"
 prog="$2"

ci/wasi.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -ex
+set -eux
 
 apt-get update
 apt-get install -y --no-install-recommends \