ld-alternative: Update check on alternatives/ld symlink

Before LLD 19 /usr/bin/ld.lld was a file, and now it's a symlink to /usr/bin/lld.
Hence, /etc/alternative/ld symlink now resolves to /usr/bin/lld,
breaking our check and raising false positives.

Updating the expression to match "lld" only fixes the issue.

.pre-commit-config.yaml

@@ -12,3 +12,10 @@ repos:
   rev: 1.32.2
   hooks:
   - id: tmt-lint
+
+- repo: https://github.com/koalaman/shellcheck-precommit
+  rev: v0.10.0
+  hooks:
+  - id: shellcheck
+    require_serial: true # Podman has trouble running concurrently
+    args: ["--exclude=SC1091"] # Ignore "Not following" sourced scripts

tests/ld-alternative/test.sh

@@ -1,11 +1,11 @@
-#!/bin/sh -eux
+#!/bin/bash -eux
 
 # This test assumes lld is already installed.
 
-function verify_ld_bfd {
+verify_ld_bfd (){
 
   # Verify that /usr/bin/ld points to ld.bfd.
-  ls -l /etc/alternatives/ld | grep ld.bfd
+  [[ $(readlink -f /etc/alternatives/ld) == *"ld.bfd" ]]
 
   # Run ld and verify it invokes ld.bfd
   /usr/bin/ld --version | grep 'GNU ld'
@@ -19,7 +19,7 @@ verify_ld_bfd
 update-alternatives --set ld /usr/bin/ld.lld
 
 # Verify that /usr/bin/ld points to lld
-ls -l /etc/alternatives/ld | grep ld.lld
+[[ $(readlink -f /etc/alternatives/ld) == *"lld" ]]
 
 # Run ld and verify it invokes lld
 /usr/bin/ld --version | grep 'LLD'