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Add ScopedEnvironmentVar class for setting env variables in BackendVk

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In the Vulkan backend, we only need to set VK_LAYER_PATH and
VK_ICD_FILENAMES while we're gathering the device information. After
this, we should unset the environment variables or they will persist
and affect loading Vulkan again (from Dawn or another client) in the
future.

Bug: dawn:406
Change-Id: I30c38b0980e181126fcd7fa911bbf9e8aa35f3b8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/22021
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
This commit is contained in:
Austin Eng
2020-05-28 16:05:04 +00:00
committed by Commit Bot service account
parent f874525de3
commit 295a4177ae
4 changed files with 95 additions and 5 deletions
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45
src/tests/unittests/SystemUtilsTests.cpp
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@@ -39,3 +39,48 @@ TEST(SystemUtilsTests, GetExecutableDirectory) {
// Test last charecter in path
ASSERT_EQ(GetExecutableDirectory().back(), *GetPathSeparator());
}
// Tests for ScopedEnvironmentVar
TEST(SystemUtilsTests, ScopedEnvironmentVar) {
SetEnvironmentVar("ScopedEnvironmentVarForTest", "original");
// Test empty environment variable doesn't crash
{ ScopedEnvironmentVar var; }
// Test setting empty environment variable
{
ScopedEnvironmentVar var;
var.Set("ScopedEnvironmentVarForTest", "NewEnvironmentVarValue");
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "NewEnvironmentVarValue");
}
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "original");
// Test that the environment variable can be set, and it is unset at the end of the scope.
{
ScopedEnvironmentVar var("ScopedEnvironmentVarForTest", "NewEnvironmentVarValue");
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "NewEnvironmentVarValue");
}
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "original");
// Test nested scopes
{
ScopedEnvironmentVar outer("ScopedEnvironmentVarForTest", "outer");
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "outer");
{
ScopedEnvironmentVar inner("ScopedEnvironmentVarForTest", "inner");
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "inner");
}
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "outer");
}
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "original");
// Test redundantly setting scoped variables
{
ScopedEnvironmentVar var1("ScopedEnvironmentVarForTest", "var1");
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "var1");
ScopedEnvironmentVar var2("ScopedEnvironmentVarForTest", "var2");
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "var2");
}
ASSERT_EQ(GetEnvironmentVar("ScopedEnvironmentVarForTest"), "original");
}