From 3ffad5b81e961659e15410e56c8945b0843e59a2 Mon Sep 17 00:00:00 2001
From: ssimpson-ens <samuel.simpson@ensilica.com>
Date: Wed, 28 Oct 2026 10:52:55 +0000
Subject: [PATCH 1/2] Set activation commands for TCSH (Same as CSH)

---
 src/managers/common/utils.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/managers/common/utils.ts b/src/managers/common/utils.ts
index 6358bf54e..c17e2efc5 100644
--- a/src/managers/common/utils.ts
+++ b/src/managers/common/utils.ts
@@ -160,6 +160,9 @@ export async function getShellActivationCommands(binDir: string): Promise<{
     if (await fs.pathExists(path.join(binDir, 'activate.csh'))) {
         shellActivation.set(ShellConstants.CSH, [{ executable: 'source', args: [path.join(binDir, `activate.csh`)] }]);
         shellDeactivation.set(ShellConstants.CSH, [{ executable: 'deactivate' }]);
+
+        shellActivation.set(ShellConstants.TCSH, [{ executable: 'source', args: [path.join(binDir, `activate.csh`)] }]);
+        shellDeactivation.set(ShellConstants.TCSH, [{ executable: 'deactivate' }]);
     }
 
     if (await fs.pathExists(path.join(binDir, 'activate.fish'))) {

From d70bb5339703baf207b6c90e7eea2a2998b7488e Mon Sep 17 00:00:00 2001
From: ssimpson-ens <samuel.simpson@ensilica.com>
Date: Thu, 29 Oct 2026 17:40:32 +0000
Subject: [PATCH 2/2] Add regression test for CSH/TCSH activation

---
 .../common/utils.getShellActivationCommands.unit.test.ts  | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/test/managers/common/utils.getShellActivationCommands.unit.test.ts b/src/test/managers/common/utils.getShellActivationCommands.unit.test.ts
index 33d7d0a21..2c1927c7a 100644
--- a/src/test/managers/common/utils.getShellActivationCommands.unit.test.ts
+++ b/src/test/managers/common/utils.getShellActivationCommands.unit.test.ts
@@ -190,6 +190,8 @@ suite('getShellActivationCommands', () => {
                 ShellConstants.GITBASH,
                 ShellConstants.ZSH,
                 ShellConstants.KSH,
+                ShellConstants.CSH,
+                ShellConstants.TCSH,
             ]) {
                 assert.strictEqual(result.shellActivation.get(shell), undefined, `${shell} should not be activated`);
                 assert.strictEqual(
@@ -213,6 +215,7 @@ suite('getShellActivationCommands', () => {
         test('POSIX shells are activated when the activate script exists', async () => {
             isWindowsStub.returns(false);
             await fs.writeFile(path.join(tmpDir, 'activate'), '');
+            await fs.writeFile(path.join(tmpDir, 'activate.csh'), '');
 
             const result = await getShellActivationCommands(tmpDir);
 
@@ -221,6 +224,11 @@ suite('getShellActivationCommands', () => {
                     { executable: 'source', args: [path.join(tmpDir, 'activate')] },
                 ]);
             }
+            for (const shell of [ShellConstants.CSH, ShellConstants.TCSH]) {
+                assert.deepStrictEqual(result.shellActivation.get(shell), [
+                    { executable: 'source', args: [path.join(tmpDir, 'activate.csh')] },
+                ]);
+            }
         });
     });
 });