[CI] Detect errors in piped commands (#289)

To bolster reliability, incorporate the -o pipefail option, which
designates a command pipeline's overall return status as failed if any
individual command within it fails. Following this, integrating the -e
option can empower the script with the ability to promptly halt
execution.

Fixes #225

.github/workflows/ci.yml

@@ -84,7 +84,7 @@ jobs:
     # actually compatible with.
     - name: Set toolchain version
       run: |
-        set -e
+        set -eo pipefail
 
         function pkg-meta {
           cargo metadata --format-version 1 | jq -r ".packages[] | select(.name == \"zerocopy\").$1"
@@ -111,7 +111,7 @@ jobs:
 
     - name: Configure environment variables
       run: |
-        set -e
+        set -eo pipefail
         if [[ '${{ matrix.toolchain }}' == 'nightly' ]]; then
           RUSTFLAGS="$RUSTFLAGS $ZC_NIGHTLY_RUSTFLAGS"
           MIRIFLAGS="$MIRIFLAGS $ZC_NIGHTLY_MIRIFLAGS"
@@ -214,7 +214,7 @@ jobs:
       - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
       - name: Check Rust formatting
         run: |
-          set -e
+          set -eo pipefail
           cargo fmt --check -p zerocopy
           cargo fmt --check -p zerocopy-derive
           shopt -s globstar
@@ -231,7 +231,7 @@ jobs:
         uses: Swatinem/rust-cache@e207df5d269b42b69c8bc5101da26f7d31feddb4 # v2.6.2
       - name: Check README.md
         run: |
-          set -e
+          set -eo pipefail
           cargo install cargo-readme --version 3.2.0
           diff <(./generate-readme.sh) README.md
           exit $?
@@ -245,7 +245,7 @@ jobs:
       # files are the same.
       - name: Check MSRVs match
         run: |
-          set -e
+          set -eo pipefail
 
           # Usage: msrv <crate-name>
           function msrv {
@@ -274,7 +274,7 @@ jobs:
       # `INTERNAL.md` for an explanation of why we do this.
       - name: Check crate versions match
         run: |
-          set -e
+          set -eo pipefail
 
           # Usage: version <crate-name>
           function version {

generate-readme.sh

@@ -4,7 +4,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-set -e
+set -eo pipefail
 
 COPYRIGHT_HEADER=$(mktemp)
 BODY=$(mktemp)