Sanity/publish_to_crates_io_warns: create test

Verify that cargo warns when publishng to crates.io

Downstreamed version of the upstream test publish_to_crates_io_warns:
https://github.com/rust-lang/cargo/blob/0.94.0/tests/testsuite/package.rs#L7741

Originally implemented in https://github.com/rust-lang/cargo/pull/16241

tests/Sanity/publish_to_crates_io_warns/main.fmf

@@ -0,0 +1,12 @@
+summary: Test cargo warning when publish to crates.io
+description: |
+  Downstreamed version of the upstream test publish_to_crates_io_warns:
+  https://github.com/rust-lang/cargo/blob/0.94.0/tests/testsuite/package.rs#L7741
+
+  Originally implemented in https://github.com/rust-lang/cargo/pull/16241
+
+  We need to downstream this test because koji builders don't have DNS resolving
+  to reach crates.io index. Hence, running this during the build will always
+  fail with an unexpected "Could not resolve host: index.crates.io" message.
+
+tier: 1

tests/Sanity/publish_to_crates_io_warns/runtest.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+CRATE_NAME="foo"
+CRATE_VER="0.1.0"
+
+function generate_cargo_toml() {
+    local dest_dir=$1
+    tee "$dest_dir/Cargo.toml" <<EOF
+[package]
+name = "$CRATE_NAME"
+version = "$CRATE_VER"
+description = "$CRATE_NAME"
+edition = "2015"
+EOF
+}
+
+
+rlJournalStart
+    rlPhaseStartSetup
+        declare tmp
+        rlRun "tmp=\$(mktemp -d)" 0 "Create tmp directory"
+        rlRun "generate_cargo_toml $tmp"
+        rlRun "pushd $tmp"
+        rlRun "mkdir src"
+        rlRun "echo 'fn main () {}' > src/main.rs"
+        rlRun "set -o pipefail"
+    rlPhaseEnd
+
+    rlPhaseStartTest
+        # Publish using dry-run to avoid real operations.
+        rlRun "cargo publish --dry-run |& tee output.log"
+        # Ensure DNS was not able to resolve the remote
+        rlAssertGrep 'Updating crates.io index' output.log
+        # Verify that cargo raises the warning
+        rlAssertGrep 'warning: manifest' output.log
+        # Verify packaging is done
+        rlAssertGrep "Packaging $CRATE_NAME v$CRATE_VER" output.log
+        rlAssertGrep "Verifying $CRATE_NAME v$CRATE_VER" output.log
+        rlAssertGrep "Compiling $CRATE_NAME v$CRATE_VER" output.log
+        rlAssertGrep "Uploading $CRATE_NAME v$CRATE_VER" output.log
+        # Verify warning about upload cancel
+        rlAssertGrep 'warning: aborting upload due to dry run' output.log
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlRun "popd"
+        rlRun "rm -r $tmp" 0 "Remove tmp directory"
+    rlPhaseEnd
+rlJournalEnd