Fix failure with missing readme.

Author: ehuss

src/cargo/ops/registry.rs

@@ -233,10 +233,13 @@ fn transmit(
         ref badges,
         ref links,
     } = *manifest.metadata();
-    let readme_content = match *readme {
-        Some(ref readme) => Some(paths::read(&pkg.root().join(readme))?),
-        None => None,
-    };
+    let readme_content = readme
+        .as_ref()
+        .map(|readme| {
+            paths::read(&pkg.root().join(readme))
+                .chain_err(|| format!("failed to read `readme` file for package `{}`", pkg))
+        })
+        .transpose()?;
     if let Some(ref file) = *license_file {
         if !pkg.root().join(file).exists() {
             bail!("the license file `{}` does not exist", file)

src/cargo/util/toml/mod.rs

@@ -1209,18 +1209,11 @@ impl TomlManifest {
             project.namespaced_features.unwrap_or(false),
         )?;
 
-        let readme = readme_for_project(package_root, project);
-        if let Some(ref r) = readme {
-            if !package_root.join(r).is_file() {
-                bail!("readme file with name '{}' was not found", r);
-            }
-        };
-
         let metadata = ManifestMetadata {
             description: project.description.clone(),
             homepage: project.homepage.clone(),
             documentation: project.documentation.clone(),
-            readme,
+            readme: readme_for_project(package_root, project),
             authors: project.authors.clone().unwrap_or_default(),
             license: project.license.clone(),
             license_file: project.license_file.clone(),

tests/testsuite/publish.rs

@@ -3,7 +3,7 @@
 use cargo_test_support::git::{self, repo};
 use cargo_test_support::paths;
 use cargo_test_support::registry::{self, registry_path, registry_url, Package};
-use cargo_test_support::{basic_manifest, project, publish};
+use cargo_test_support::{basic_manifest, no_such_file_err_msg, project, publish};
 use std::fs;
 
 const CLEAN_FOO_JSON: &str = r#"
@@ -1341,3 +1341,43 @@ See [..]
         )
         .run();
 }
+
+#[cargo_test]
+fn publish_with_missing_readme() {
+    registry::init();
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.1.0"
+                authors = []
+                license = "MIT"
+                description = "foo"
+                homepage = "https://example.com/"
+                readme = "foo.md"
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .build();
+
+    p.cargo("publish --no-verify --token sekrit")
+        .with_status(101)
+        .with_stderr(&format!(
+            "\
+[UPDATING] [..]
+[PACKAGING] foo v0.1.0 [..]
+[UPLOADING] foo v0.1.0 [..]
+[ERROR] failed to read `readme` file for package `foo v0.1.0 ([ROOT]/foo)`
+
+Caused by:
+  failed to read `[ROOT]/foo/foo.md`
+
+Caused by:
+  {}
+",
+            no_such_file_err_msg()
+        ))
+        .run();
+}

tests/testsuite/read_manifest.rs

@@ -195,19 +195,6 @@ fn cargo_read_manifest_defaults_readme_if_true() {
         .build();
 
     p.cargo("read-manifest")
-        .with_json(&manifest_output(&format!(r#""{}""#, "README.md")))
+        .with_json(&manifest_output(r#""README.md""#))
         .run();
 }
-
-// If a file named README.md does not exist, and `readme = true`, it should panic.
-#[cargo_test]
-#[should_panic]
-fn cargo_read_manifest_panics_if_default_readme_not_found() {
-    let p = project()
-        .file("Cargo.toml", &basic_bin_manifest_with_readme("foo", "true"))
-        .file("README.txt", "Sample project")
-        .file("src/foo.rs", &main_file(r#""i am foo""#, &[]))
-        .build();
-
-    p.cargo("read-manifest").run();
-}