[weihanglo]

#2852 changed how the compiler detection works. Now it requests both sysroot and target-libdir. We need to adjust the mock rustc accordingly.

This should fix the CI failure in https://github.com/mozilla/sccache/actions/runs/37596909346/job/112711671349.

Expand to see failures

---- server::tests::daemon_mode_rmeta_notification_delivery_on_rustc_miss stdout ----
[2026-10-07T08:56:15Z DEBUG sccache::compiler::compiler] Using rustc at path: "/tmp/sccache_testlQ0jel/rustc"
[2026-10-07T08:56:15Z DEBUG sccache::server] check_compiler: Unsupported compiler: rustc didn't print a target-libdir

thread 'server::tests::daemon_mode_rmeta_notification_delivery_on_rustc_miss' (8361) panicked at src/server.rs:2759:22:
unexpected response: Compile(UnsupportedCompiler("rustc didn't print a target-libdir"))
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: sccache::server::tests::compile_body
   3: sccache::server::tests::daemon_mode_rmeta_notification_delivery_on_rustc_miss
   4: sccache::server::tests::daemon_mode_rmeta_notification_delivery_on_rustc_miss::{closure#0}
   5: <sccache::server::tests::daemon_mode_rmeta_notification_delivery_on_rustc_miss::{closure#0} as core::ops::function::FnOnce<()>>::call_once
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

---- server::tests::client_side_mode_rmeta_notification_delivery_on_rustc_miss stdout ----
[2026-10-07T08:56:15Z DEBUG sccache::compiler::compiler] Using rustc at path: "/tmp/sccache_testVykQEK/rustc"
[2026-10-07T08:56:15Z DEBUG sccache::server] check_compiler: Unsupported compiler: rustc didn't print a target-libdir

thread 'server::tests::client_side_mode_rmeta_notification_delivery_on_rustc_miss' (8360) panicked at src/server.rs:2803:33:
compile started
stack backtrace:
   0: __rustc::rust_begin_unwind
   1: core::panicking::panic_fmt
   2: core::option::expect_failed
   3: <core::option::Option<sccache::protocol::CompileFinished>>::expect
   4: sccache::server::tests::client_side_mode_rmeta_notification_delivery_on_rustc_miss
   5: sccache::server::tests::client_side_mode_rmeta_notification_delivery_on_rustc_miss::{closure#0}
   6: <sccache::server::tests::client_side_mode_rmeta_notification_delivery_on_rustc_miss::{closure#0} as core::ops::function::FnOnce<()>>::call_once

🤖 LLM disclosure: code change was fully generated by LLM.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.57%. Comparing base (0ed8ff0) to head (c20e681).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2885       +/-   ##
===========================================
+ Coverage   27.87%   77.57%   +49.70%     
===========================================
  Files          71       72        +1     
  Lines       38079    41409     +3330     
===========================================
+ Hits        10614    32124    +21510     
+ Misses      27465     9285    -18180     

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[sylvestre]

Thanks for your PR