[llvm] [lit] Update shtest-ulimit.py to explicitly check default limits (PR #164678)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-testing-tools

Author: Aiden Grossman (boomanaiden154)

<details>
<summary>Changes</summary>

The recently added ulimit_reset.txt section in shtest-ulimit.py was failing on some builders if the default file descriptor limit started with 50. This patch fixes that by explicitly checking that the file descriptor limit is equal to the default value.

---
Full diff: https://github.com/llvm/llvm-project/pull/164678.diff


1 Files Affected:

- (modified) llvm/utils/lit/tests/shtest-ulimit.py (+6-2) 


``````````diff
diff --git a/llvm/utils/lit/tests/shtest-ulimit.py b/llvm/utils/lit/tests/shtest-ulimit.py
index 9a8febd3333c4..dadde70336812 100644
--- a/llvm/utils/lit/tests/shtest-ulimit.py
+++ b/llvm/utils/lit/tests/shtest-ulimit.py
@@ -5,7 +5,11 @@
 # as well.
 # UNSUPPORTED: system-windows, system-solaris
 
-# RUN: not %{lit} -a -v %{inputs}/shtest-ulimit --order=lexical | FileCheck %s
+# RUN: %{python} %S/Inputs/shtest-ulimit/print_limits.py | grep RLIMIT_NOFILE \
+# RUN:   | sed -n -e 's/.*=//p' | tr -d '\n' > %t.nofile_limit
+
+# RUN: not %{lit} -a -v %{inputs}/shtest-ulimit --order=lexical \
+# RUN:   | FileCheck -DBASE_NOFILE_LIMIT=%{readfile:%t.nofile_limit} %s
 
 # CHECK: -- Testing: 3 tests{{.*}}
 
@@ -18,4 +22,4 @@
 # CHECK: RLIMIT_NOFILE=50
 
 # CHECK-LABEL: FAIL: shtest-ulimit :: ulimit_reset.txt ({{[^)]*}})
-# CHECK-NOT: RLIMIT_NOFILE=50
+# CHECK: RLIMIT_NOFILE=[[BASE_NOFILE_LIMIT]]

``````````

</details>


https://github.com/llvm/llvm-project/pull/164678