ci: extract verifying line endings into a script

Author: pietroalbini

src/ci/azure-pipelines/steps/run.yml

@@ -126,33 +126,17 @@ steps:
   displayName: Disable git automatic line ending conversion
   condition: and(succeeded(), not(variables.SKIP_JOB))
 
-# Check out all our submodules, but more quickly than using git by using one of
-# our custom scripts
 - bash: src/ci/scripts/checkout-submodules.sh
   env:
     AGENT_OS: $(Agent.OS)
   displayName: Checkout submodules
   condition: and(succeeded(), not(variables.SKIP_JOB))
 
-# See also the disable for autocrlf above, this just checks that it worked
-#
-# We check both in rust-lang/rust and in a submodule to make sure both are
-# accurate. Submodules are checked out significantly later than the main
-# repository in this script, so settings can (and do!) change between then.
-#
-# Linux (and maybe macOS) builders don't currently have dos2unix so just only
-# run this step on Windows.
-- bash: |
-    set -x
-    # print out the git configuration so we can better investigate failures in
-    # the following
-    git config --list --show-origin
-    dos2unix -ih Cargo.lock src/tools/rust-installer/install-template.sh
-    endings=$(dos2unix -ic Cargo.lock src/tools/rust-installer/install-template.sh)
-    # if endings has non-zero length, error out
-    if [ -n "$endings" ]; then exit 1 ; fi
-  condition: and(succeeded(), eq(variables['Agent.OS'], 'Windows_NT'))
-  displayName: Verify line endings are LF
+- bash: src/ci/scripts/verify-line-endings.sh
+  env:
+    AGENT_OS: $(Agent.OS)
+  displayName: Verify line endings
+  condition: and(succeeded(), not(variables.SKIP_JOB))
 
 # Ensure the `aws` CLI is installed so we can deploy later on, cache docker
 # images, etc.

src/ci/scripts/verify-line-endings.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# See also the disable for autocrlf, this just checks that it worked.
+#
+# We check both in rust-lang/rust and in a submodule to make sure both are
+# accurate. Submodules are checked out significantly later than the main
+# repository in this script, so settings can (and do!) change between then.
+#
+# Linux (and maybe macOS) builders don't currently have dos2unix so just only
+# run this step on Windows.
+
+set -euo pipefail
+IFS=$'\n\t'
+
+source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
+
+if isWindows; then
+    # print out the git configuration so we can better investigate failures in
+    # the following
+    git config --list --show-origin
+    dos2unix -ih Cargo.lock src/tools/rust-installer/install-template.sh
+    endings=$(dos2unix -ic Cargo.lock src/tools/rust-installer/install-template.sh)
+    # if endings has non-zero length, error out
+    if [ -n "$endings" ]; then exit 1 ; fi
+fi