Reframe `--locked` and `--frozen` as `--check` operations for `uv lock` (#9662)

Closes https://github.com/astral-sh/uv/issues/7639

crates/uv-cli/src/lib.rs

@@ -3042,22 +3042,26 @@ pub struct SyncArgs {
 #[derive(Args)]
 #[allow(clippy::struct_excessive_bools)]
 pub struct LockArgs {
-    /// Assert that the `uv.lock` will remain unchanged.
+    /// Check if the lockfile is up-to-date.
     ///
-    /// Requires that the lockfile is up-to-date. If the lockfile is missing or
-    /// needs to be updated, uv will exit with an error.
-    #[arg(long, env = EnvVars::UV_LOCKED, value_parser = clap::builder::BoolishValueParser::new(), conflicts_with = "frozen")]
-    pub locked: bool,
+    /// Asserts that the `uv.lock` would remain unchanged after a resolution. If the lockfile is
+    /// missing or needs to be updated, uv will exit with an error.
+    ///
+    /// Equivalent to `--locked`.
+    #[arg(long, alias = "locked", env = EnvVars::UV_LOCKED, value_parser = clap::builder::BoolishValueParser::new(), conflicts_with = "check_exists")]
+    pub check: bool,
 
-    /// Assert that a `uv.lock` exists, without updating it.
-    #[arg(long, env = EnvVars::UV_FROZEN, value_parser = clap::builder::BoolishValueParser::new(), conflicts_with = "locked")]
-    pub frozen: bool,
+    /// Assert that a `uv.lock` exists without checking if it is up-to-date.
+    ///
+    /// Equivalent to `--frozen`.
+    #[arg(long, alias = "frozen", env = EnvVars::UV_FROZEN, value_parser = clap::builder::BoolishValueParser::new(), conflicts_with = "check")]
+    pub check_exists: bool,
 
     /// Perform a dry run, without writing the lockfile.
     ///
     /// In dry-run mode, uv will resolve the project's dependencies and report on the resulting
     /// changes, but will not write the lockfile to disk.
-    #[arg(long, conflicts_with = "frozen", conflicts_with = "locked")]
+    #[arg(long, conflicts_with = "check_exists", conflicts_with = "check")]
     pub dry_run: bool,
 
     #[command(flatten)]

crates/uv/src/settings.rs

@@ -990,8 +990,8 @@ impl LockSettings {
     #[allow(clippy::needless_pass_by_value)]
     pub(crate) fn resolve(args: LockArgs, filesystem: Option<FilesystemOptions>) -> Self {
         let LockArgs {
-            locked,
-            frozen,
+            check,
+            check_exists,
             dry_run,
             resolver,
             build,
@@ -1005,8 +1005,8 @@ impl LockSettings {
             .unwrap_or_default();
 
         Self {
-            locked,
-            frozen,
+            locked: check,
+            frozen: check_exists,
             dry_run,
             python: python.and_then(Maybe::into_option),
             refresh: Refresh::from(refresh),

docs/concepts/projects/sync.md

@@ -27,6 +27,14 @@ To avoid updating the environment during `uv run` invocations, use the `--no-syn
 To assert the lockfile matches the project metadata, use the `--locked` flag. If the lockfile is not
 up-to-date, an error will be raised instead of updating the lockfile.
 
+You can also check if the lockfile is up-to-date by passing the `--check` flag to `uv lock`:
+
+```console
+$ uv lock --check
+```
+
+This is equivalent to the `--locked` flag for other commands.
+
 ### Upgrading locked package versions
 
 By default, uv will prefer the locked versions of packages when running `uv sync` and `uv lock`.

docs/reference/cli.md

@@ -1790,6 +1790,18 @@ uv lock [OPTIONS]
 <p>To view the location of the cache directory, run <code>uv cache dir</code>.</p>
 
 <p>May also be set with the <code>UV_CACHE_DIR</code> environment variable.</p>
+</dd><dt><code>--check</code></dt><dd><p>Check if the lockfile is up-to-date.</p>
+
+<p>Asserts that the <code>uv.lock</code> would remain unchanged after a resolution. If the lockfile is missing or needs to be updated, uv will exit with an error.</p>
+
+<p>Equivalent to <code>--locked</code>.</p>
+
+<p>May also be set with the <code>UV_LOCKED</code> environment variable.</p>
+</dd><dt><code>--check-exists</code></dt><dd><p>Assert that a <code>uv.lock</code> exists without checking if it is up-to-date.</p>
+
+<p>Equivalent to <code>--frozen</code>.</p>
+
+<p>May also be set with the <code>UV_FROZEN</code> environment variable.</p>
 </dd><dt><code>--color</code> <i>color-choice</i></dt><dd><p>Control colors in output</p>
 
 <p>[default: auto]</p>
@@ -1845,9 +1857,6 @@ uv lock [OPTIONS]
 <p>If a URL, the page must contain a flat list of links to package files adhering to the formats described above.</p>
 
 <p>May also be set with the <code>UV_FIND_LINKS</code> environment variable.</p>
-</dd><dt><code>--frozen</code></dt><dd><p>Assert that a <code>uv.lock</code> exists, without updating it</p>
-
-<p>May also be set with the <code>UV_FROZEN</code> environment variable.</p>
 </dd><dt><code>--help</code>, <code>-h</code></dt><dd><p>Display the concise help for this command</p>
 
 </dd><dt><code>--index</code> <i>index</i></dt><dd><p>The URLs to use when resolving dependencies, in addition to the default index.</p>
@@ -1910,11 +1919,6 @@ uv lock [OPTIONS]
 
 <li><code>symlink</code>:  Symbolically link packages from the wheel into the <code>site-packages</code> directory</li>
 </ul>
-</dd><dt><code>--locked</code></dt><dd><p>Assert that the <code>uv.lock</code> will remain unchanged.</p>
-
-<p>Requires that the lockfile is up-to-date. If the lockfile is missing or needs to be updated, uv will exit with an error.</p>
-
-<p>May also be set with the <code>UV_LOCKED</code> environment variable.</p>
 </dd><dt><code>--native-tls</code></dt><dd><p>Whether to load TLS certificates from the platform&#8217;s native certificate store.</p>
 
 <p>By default, uv loads certificates from the bundled <code>webpki-roots</code> crate. The <code>webpki-roots</code> are a reliable set of trust roots from Mozilla, and including them in uv improves portability and performance (especially on macOS).</p>