Replace unwrap with ? in hash generation (#3003)

And add tests to catch it.

crates/pypi-types/src/simple_json.rs

@@ -340,7 +340,7 @@ pub enum HashError {
     InvalidStructure(String),
 
     #[error(
-        "Unsupported hash algorithm (expected `md5`, `sha256`, `sha384`, or `sha512`) on: {0}"
+        "Unsupported hash algorithm: `{0}` (expected one of: `md5`, `sha256`, `sha384`, or `sha512`)"
     )]
     UnsupportedHashAlgorithm(String),
 }

crates/uv-types/src/hash.rs

@@ -141,8 +141,7 @@ impl HashStrategy {
             let digests = digests
                 .iter()
                 .map(|digest| HashDigest::from_str(digest))
-                .collect::<Result<Vec<_>, _>>()
+                .collect::<Result<Vec<_>, _>>()?;
-                .unwrap();
 
             hashes.insert(id, digests);
         }

crates/uv/tests/pip_sync.rs

@@ -3088,6 +3088,31 @@ requires-python = "<=3.5"
     Ok(())
 }
 
+/// Use an unknown hash algorithm with `--require-hashes`.
+#[test]
+fn require_hashes_unknown_algorithm() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let requirements_txt = context.temp_dir.child("requirements.txt");
+    requirements_txt.write_str(
+        "anyio==4.0.0 --hash=foo:cfdb2b588b9fc25ede96d8db56ed50848b0b649dca3dd1df0b11f683bb9e0b5f",
+    )?;
+
+    uv_snapshot!(command(&context)
+        .arg("requirements.txt")
+        .arg("--require-hashes"), @r###"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Unsupported hash algorithm: `foo` (expected one of: `md5`, `sha256`, `sha384`, or `sha512`)
+    "###
+    );
+
+    Ok(())
+}
+
 /// Omit the hash with `--require-hashes`.
 #[test]
 fn require_hashes_missing_hash() -> Result<()> {
@@ -3168,6 +3193,47 @@ fn require_hashes_missing_version() -> Result<()> {
     Ok(())
 }
 
+/// Use a non-`==` operator with `--require-hashes`.
+#[test]
+fn require_hashes_invalid_operator() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let requirements_txt = context.temp_dir.child("requirements.txt");
+    requirements_txt.write_str(
+        "anyio>4.0.0 --hash=sha256:cfdb2b588b9fc25ede96d8db56ed50848b0b649dca3dd1df0b11f683bb9e0b5f",
+    )?;
+
+    // Install without error when `--require-hashes` is omitted.
+    uv_snapshot!(command(&context)
+        .arg("requirements.txt"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Resolved 1 package in [TIME]
+    Downloaded 1 package in [TIME]
+    Installed 1 package in [TIME]
+     + anyio==4.3.0
+    "###
+    );
+
+    // Error when `--require-hashes` is provided.
+    uv_snapshot!(command(&context)
+        .arg("requirements.txt")
+        .arg("--require-hashes"), @r###"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: In `--require-hashes` mode, all requirement must have their versions pinned with `==`, but found: anyio>4.0.0
+    "###
+    );
+
+    Ok(())
+}
+
 /// Include the hash for _just_ the wheel with `--no-binary`.
 #[test]
 fn require_hashes_wheel_no_binary() -> Result<()> {