[PATCH v2 1/5] rust: Fetch cargo from rust-snapshot dir.

[Yash.Shinde@windriver.com]

From: Yash Shinde <Yash.Shinde@windriver.com>

Fixes: Exception: no cargo executable found at
       `${B}/rustc-1.74.1-src/build/x86_64-unknown-linux-gnu/stage0/bin/cargo`

Fix the cargo binary path error on oe-selftest and path set to rust-snapshot dir.

Patch sent to upstream- https://github.com/rust-lang/rust/pull/120125

Signed-off-by: Yash Shinde <Yash.Shinde@windriver.com>
---
 .../rust/files/cargo-path.patch               | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 meta/recipes-devtools/rust/files/cargo-path.patch

diff --git a/meta/recipes-devtools/rust/files/cargo-path.patch b/meta/recipes-devtools/rust/files/cargo-path.patch
new file mode 100644
index 0000000000..547df353d2
--- /dev/null
+++ b/meta/recipes-devtools/rust/files/cargo-path.patch
@@ -0,0 +1,37 @@
+Fix the cargo binary path error and ensure that it is fetched 
+during rustc bootstrap in rust oe-selftest. 
+
+======================================================================
+ERROR: test_cargoflags (bootstrap_test.BuildBootstrap)
+----------------------------------------------------------------------
+Traceback (most recent call last):
+  File "/home/build-st/tmp/work/cortexa57-poky-linux/rust/1.74.1/rustc-1.74.1-src/src/bootstrap/bootstrap_test.py", line 157, in test_cargoflags
+    args, _ = self.build_args(env={"CARGOFLAGS": "--timings"})
+  File "/home/build-st/tmp/work/cortexa57-poky-linux/rust/1.74.1/rustc-1.74.1-src/src/bootstrap/bootstrap_test.py", line 154, in build_args
+    return build.build_bootstrap_cmd(env), env
+  File "/home/build-st/tmp/work/cortexa57-poky-linux/rust/1.74.1/rustc-1.74.1-src/src/bootstrap/bootstrap.py", line 960, in build_bootstrap_cmd
+    raise Exception("no cargo executable found at `{}`".format(
+Exception: no cargo executable found at `/home/build-st/tmp/work/cortexa57-poky-linux/rust/1.74.1/rustc-1.74.1-src/build/x86_64-unknown-linux-gnu/stage0/bin/cargo`
+
+Upstream-Status: Submitted [https://github.com/rust-lang/rust/pull/120125]
+
+Signed-off-by: Yash Shinde <Yash.Shinde@windriver.com>
+---
+diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
+--- a/src/bootstrap/bootstrap.py
++++ b/src/bootstrap/bootstrap.py
+@@ -954,9 +954,11 @@
+         if deny_warnings:
+             env["RUSTFLAGS"] += " -Dwarnings"
+
+-        env["PATH"] = os.path.join(self.bin_root(), "bin") + \
+-            os.pathsep + env["PATH"]
+-        if not os.path.isfile(self.cargo()):
++        cargo_bin_path = os.path.join(self.bin_root(), "bin", "cargo")
++        if not os.path.isfile(cargo_bin_path):
++            cargo_bin_path = os.getenv("RUST_TARGET_PATH") + "rust-snapshot/bin/cargo"
++            env["PATH"] = os.path.dirname(cargo_bin_path) + os.pathsep + env["PATH"]
++        else:
+             raise Exception("no cargo executable found at `{}`".format(
+                 self.cargo()))
+         args = [self.cargo(), "build", "--manifest-path",
-- 
2.43.0