Provide a harness driving rust-openssl's regress tests

rust-openssl is an integral part of the Rust ecosystem and more than a
dozen ports, including lang/rust itself, depend on it. We need to ensure
that it keeps working with LibreSSL.

If the rust and rust-openssl-tests packages are installed, create a cargo
workspace under obj/ that compiles and runs the rust-openssl regress tests
much like what is done for the openssl-ruby tests. This expands our regress
coverage: for instance, this would have caught the broken ASN.1 indefinite
length encoding caused by asn1/tasn_enc.c r1.25.

Positive feedback beck jsing semarie
Testing and ok anton

3 files changed, 62 insertions, 0 deletions

diff --git a/src/regress/lib/libssl/rust-openssl/Cargo.toml b/src/regress/lib/libssl/rust-openssl/Cargo.toml
new file mode 100644
index 0000000000..c33c3475a7
--- /dev/null
+++ b/src/regress/lib/libssl/rust-openssl/Cargo.toml
@@ -0,0 +1,8 @@
+[workspace]
+members = [
+    "openssl",
+    "openssl-errors",
+    "openssl-macros",
+    "openssl-sys",
+    "systest",
+]
diff --git a/src/regress/lib/libssl/rust-openssl/Makefile b/src/regress/lib/libssl/rust-openssl/Makefile
new file mode 100644
index 0000000000..88e231ec08
--- /dev/null
+++ b/src/regress/lib/libssl/rust-openssl/Makefile
@@ -0,0 +1,48 @@
+#       $OpenBSD: Makefile,v 1.1.1.1 2022/10/20 07:33:14 tb Exp $
+
+RUST_OPENSSL_TESTS =    /usr/local/share/rust-openssl-tests
+CARGO =                 /usr/local/bin/cargo
+
+.if !exists(${RUST_OPENSSL_TESTS}) || !exists(${CARGO})
+regress:
+        @echo packages rust-openssl-tests and rust are required for this regress
+        @echo SKIPPED
+.else
+
+REGRESS_TARGETS +=      rust-openssl-test
+
+WORKSPACE_LINKS = openssl openssl-errors openssl-macros openssl-sys systest
+
+_WORKSPACE_COOKIE =     .workspace
+
+${_WORKSPACE_COOKIE}:
+. if ${.CURDIR} != ${.OBJDIR}
+        cp ${.CURDIR}/Cargo.toml ${.OBJDIR}/
+. endif
+        mkdir -p .cargo
+        cp ${.CURDIR}/config .cargo/
+        cd ${.OBJDIR} && ln -sf ${WORKSPACE_LINKS:S,^,${RUST_OPENSSL_TESTS}/,} .
+        touch $@
+
+CLEANFILES += Cargo.lock
+
+. if ${.CURDIR} != ${.OBJDIR}
+CLEANFILES += Cargo.toml
+. endif
+
+rust-openssl-test: ${_WORKSPACE_COOKIE}
+        cd ${.OBJDIR} && cargo test --offline --color=never -- --color=never
+
+CLEANFILES +=   ${_WORKSPACE_COOKIE} ${WORKSPACE_LINKS}
+
+. if make(clean) || make(cleandir)
+.  if exists(.cargo) || exists(target)
+.BEGIN:
+        rm -rf .cargo
+        rm -rf target
+.  endif
+. endif
+
+.endif
+
+.include <bsd.regress.mk>
diff --git a/src/regress/lib/libssl/rust-openssl/config b/src/regress/lib/libssl/rust-openssl/config
new file mode 100644
index 0000000000..a47474744d
--- /dev/null
+++ b/src/regress/lib/libssl/rust-openssl/config
@@ -0,0 +1,6 @@
+[net]
+        offline = true
+[source.modcargo]
+        directory = '/usr/local/share/rust-openssl-tests/modcargo-crates'
+[source.crates-io]
+        replace-with = 'modcargo'