cargo.bbclass: use offline mode for building

There should not be any network access during the build step so
specify this explicitely to cargo.
This will allow better error message, e.g:

| Caused by:
|  can't checkout from 'ssh://git@.../fmartinsons/zbus-git-dep-test.git': you are in  the offline mode (--offline)

Instead of

|   Updating git repository `ssh://git@.../fmartinsons/zbus-git-dep-test.git`
| warning: spurious network error (2 tries remaining): failed to resolve address for gitlab.com: Temporary failure in name resolution;class=Net (12)

Signed-off-by: Frederic Martinsons <frederic.martinsons@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 8e9ec03c73e8c09e223d6f6cce297df363991350)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

diff --git a/meta/classes-recipe/cargo.bbclass b/meta/classes-recipe/cargo.bbclass
index d1e83518b586bc5ac0a7f28a282307c25d4cc05e..b27eb2f209cdc6feee9aa07f9516d3773e9753ee 100644 (file)
--- a/meta/classes-recipe/cargo.bbclass
+++ b/meta/classes-recipe/cargo.bbclass
@@ -39,7 +39,7 @@ MANIFEST_PATH ??= "${S}/${CARGO_SRC_DIR}/Cargo.toml"
 
 RUSTFLAGS ??= ""
 BUILD_MODE = "${@['--release', ''][d.getVar('DEBUG_BUILD') == '1']}"
-CARGO_BUILD_FLAGS = "-v --target ${RUST_HOST_SYS} ${BUILD_MODE} --manifest-path=${MANIFEST_PATH}"
+CARGO_BUILD_FLAGS = "-v --offline --target ${RUST_HOST_SYS} ${BUILD_MODE} --manifest-path=${MANIFEST_PATH}"
 
 # This is based on the content of CARGO_BUILD_FLAGS and generally will need to
 # change if CARGO_BUILD_FLAGS changes.