[Benoît Cortier (CBenoit)]

TextTransform.exe fails with CS1519 when the template has LF line endings, which is what a checkout with core.autocrlf=input or false produces, since Strings.g.tt has no eol attribute. T4 then replaces Strings.g.cs with ErrorGeneratingOutput, so the failed run also corrupts the working tree.

Write the temporary template with CRLF endings whatever the checkout uses. When TextTransform fails for any selected project, remove the outputs the run created and restore the generated files of every selected project from their original bytes, so a failed run exits non-zero and changes nothing.

Regenerating also restores the trailing tabs the template emits on five Agent Tunnel constants of the Gateway Strings.g.cs, which had been added without them.

🤖 Generated with Claude Code

[Benoît Cortier (CBenoit)]

Reproduction and proof

Checkout with core.autocrlf=input; git ls-files --eol reports i/lf w/lf for both Strings.g.tt.

Before (master script, LF templates), for both -Product agent and -Product gateway:

error CS1519: Compiling transformation: CS1519: Invalid token 'this' in a member declaration
TextTransform failed for AgentWindowsManaged

The script exits 1, but Strings.g.cs is replaced by the single line ErrorGeneratingOutput (Agent: 308 lines deleted, Gateway: 932).

After, all checks run with pwsh -NoProfile -File package/Update-InstallerLocalization.ps1:

Case	Exit	Result
LF templates, -Product all	0	Agent outputs byte-identical to committed; Gateway Strings.g.cs differs only by the 5 trailing-tab lines in this PR
CRLF templates (w/crlf), -Product all	0	SHA-256 of all 8 *.wxl and Strings.g.cs identical to the LF run
CRLF templates, master script	0	Same 8 hashes, so the fix does not change generated output
Agent template with <#+ this is not C# #> appended	1	TextTransform failed for AgentWindowsManaged; generated files were left unchanged; Strings.g.cs hash unchanged; no _Strings.*.tt left behind

The 5-line Strings.g.cs difference is the master script's own output on a CRLF checkout too: those Agent Tunnel constants were committed without the trailing tabs Strings.g.tt emits on every constant.

Lines changed

Area	Added	Removed
Production code	0	0
Tests	0	0
Other: package/Update-InstallerLocalization.ps1 (developer tooling)	10	1
Other: generated Strings.g.cs (whitespace only)	5	5

Note

LLM-assisted content (no human feedback).

[Copilot]

🟡 Changes recommended

Rollback can leave earlier projects’ changes and newly created outputs behind, violating the unchanged-on-failure guarantee.

2 open issues

• Rollback does not restore earlier project changes · New
• Rollback leaves newly generated outputs after failure · New

What changed in this PR

This PR makes installer localization regeneration work in LF checkouts and adds rollback when TextTransform fails.

Changes:

• Normalize temporary T4 templates to CRLF before execution.
• Save existing generated files and restore their bytes on transformation failure.
• Restore generator-emitted trailing tabs on five Gateway constants, with no functional C# changes.

File	Description
package/​WindowsManaged/​Resources/​Strings.g.cs	Align five constants with generated whitespace.
package/​Update-InstallerLocalization.ps1	Normalize template line endings and add failure rollback.

_{Review effort: Balanced}