Auto merge of #3096 - str4d:2231-depends-vendor-rust-crates, r=str4d

depends: Explicitly download and vendor Rust dependencies

Closes #2231.

depends/packages/crate_libc.mk

@@ -0,0 +1,15 @@
+package=crate_libc
+$(package)_crate_name=libc
+$(package)_version=0.2.21
+$(package)_download_path=https://static.crates.io/crates/$($(package)_crate_name)
+$(package)_file_name=$($(package)_crate_name)-$($(package)_version).crate
+$(package)_sha256_hash=88ee81885f9f04bff991e306fea7c1c60a5f0f9e409e99f6b40e3311a3363135
+$(package)_crate_versioned_name=$($(package)_crate_name)
+
+define $(package)_preprocess_cmds
+  $(call generate_crate_checksum,$(package))
+endef
+
+define $(package)_stage_cmds
+  $(call vendor_crate_source,$(package))
+endef

depends/packages/librustzcash.mk

@@ -5,10 +5,16 @@ $(package)_file_name=$(package)-$($(package)_git_commit).tar.gz
 $(package)_download_file=$($(package)_git_commit).tar.gz
 $(package)_sha256_hash=a5760a90d4a1045c8944204f29fa2a3cf2f800afee400f88bf89bbfe2cce1279
 $(package)_git_commit=91348647a86201a9482ad4ad68398152dc3d635e
-$(package)_dependencies=rust
+$(package)_dependencies=rust $(rust_crates)
+$(package)_patches=cargo.config
+
+define $(package)_preprocess_cmds
+  mkdir .cargo && \
+  cat $($(package)_patch_dir)/cargo.config | sed 's|CRATE_REGISTRY|$(host_prefix)/$(CRATE_REGISTRY)|' > .cargo/config
+endef
 
 define $(package)_build_cmds
-  cargo build --release
+  cargo build --frozen --release
 endef
 
 define $(package)_stage_cmds

depends/packages/packages.mk

@@ -1,4 +1,5 @@
-rust_packages := rust librustzcash
+rust_crates := crate_libc
+rust_packages := rust $(rust_crates) librustzcash
 proton_packages := proton
 zcash_packages := libgmp libsodium
 packages := boost openssl libevent zeromq $(zcash_packages) googletest