Add --lockfile-path flag

src/bin/cargo/commands/add.rs

@@ -87,6 +87,7 @@ Example uses:
 - Depend on crates with the same name from different registries"),
         ])
         .arg_manifest_path_without_unsupported_path_tip()
+        .arg_lockfile_path()
         .arg_package("Package to modify")
         .arg_ignore_rust_version()
         .arg_dry_run("Don't actually write the manifest")

src/bin/cargo/commands/bench.rs

@@ -50,6 +50,7 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help bench</>` for more detailed information.\n"

src/bin/cargo/commands/build.rs

@@ -39,6 +39,7 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help build</>` for more detailed information.\n"

src/bin/cargo/commands/check.rs

@@ -36,6 +36,7 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help check</>` for more detailed information.\n"

src/bin/cargo/commands/clean.rs

@@ -19,6 +19,7 @@ pub fn cli() -> Command {
         .arg_target_triple("Target triple to clean output for")
         .arg_target_dir()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_dry_run("Display what would be deleted without deleting anything")
         .args_conflicts_with_subcommands(true)
         .subcommand(

src/bin/cargo/commands/doc.rs

@@ -39,6 +39,7 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help doc</>` for more detailed information.\n"

src/bin/cargo/commands/fetch.rs

@@ -9,6 +9,7 @@ pub fn cli() -> Command {
         .arg_silent_suggestion()
         .arg_target_triple("Fetch dependencies for the target triple")
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help fetch</>` for more detailed information.\n"
         ))

src/bin/cargo/commands/fix.rs

@@ -1,6 +1,6 @@
 use crate::command_prelude::*;
-
 use cargo::core::Workspace;
+
 use cargo::ops;
 
 pub fn cli() -> Command {
@@ -54,6 +54,7 @@ pub fn cli() -> Command {
         .arg_target_dir()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help fix</>` for more detailed information.\n"
@@ -71,8 +72,13 @@ pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
     // Unlike other commands default `cargo fix` to all targets to fix as much
     // code as we can.
     let root_manifest = args.root_manifest(gctx)?;
+
+    // Can't use workspace() to avoid using -Zavoid-dev-deps (if passed)
     let mut ws = Workspace::new(&root_manifest, gctx)?;
     ws.set_resolve_honors_rust_version(args.honor_rust_version());
+    let lockfile_path = args.lockfile_path(gctx)?;
+    ws.set_requested_lockfile_path(lockfile_path.clone());
+
     let mut opts = args.compile_options(gctx, mode, Some(&ws), ProfileChecking::LegacyTestOnly)?;
 
     if !opts.filter.is_specific() {
@@ -92,6 +98,7 @@ pub fn exec(gctx: &mut GlobalContext, args: &ArgMatches) -> CliResult {
             allow_no_vcs: args.flag("allow-no-vcs"),
             allow_staged: args.flag("allow-staged"),
             broken_code: args.flag("broken-code"),
+            requested_lockfile_path: lockfile_path,
         },
     )?;
     Ok(())

src/bin/cargo/commands/generate_lockfile.rs

@@ -7,6 +7,7 @@ pub fn cli() -> Command {
         .about("Generate the lockfile for a package")
         .arg_silent_suggestion()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version_with_help(
             "Ignore `rust-version` specification in packages (unstable)",
         )

src/bin/cargo/commands/metadata.rs

@@ -1,6 +1,7 @@
-use crate::command_prelude::*;
 use cargo::ops::{self, OutputMetadataOptions};
 
+use crate::command_prelude::*;
+
 pub fn cli() -> Command {
     subcommand("metadata")
         .about(
@@ -26,6 +27,7 @@ pub fn cli() -> Command {
         .arg_silent_suggestion()
         .arg_features()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help metadata</>` for more detailed information.\n"
         ))

src/bin/cargo/commands/package.rs

@@ -37,6 +37,7 @@ pub fn cli() -> Command {
         .arg_target_dir()
         .arg_parallel()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help package</>` for more detailed information.\n"
         ))

src/bin/cargo/commands/pkgid.rs

@@ -10,6 +10,7 @@ pub fn cli() -> Command {
         .arg_silent_suggestion()
         .arg_package("Argument to get the package ID specifier for")
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help pkgid</>` for more detailed information.\n"
         ))

src/bin/cargo/commands/publish.rs

@@ -24,6 +24,7 @@ pub fn cli() -> Command {
         .arg_target_triple("Build for the target triple")
         .arg_target_dir()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help publish</>` for more detailed information.\n"
         ))

src/bin/cargo/commands/remove.rs

@@ -51,6 +51,7 @@ pub fn cli() -> clap::Command {
         ])
         .arg_package("Package to remove from")
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help remove</>` for more detailed information.\n"
         ))

src/bin/cargo/commands/run.rs

@@ -38,6 +38,7 @@ pub fn cli() -> Command {
         .arg_target_triple("Build for the target triple")
         .arg_target_dir()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .arg_unit_graph()
         .arg_timings()

src/bin/cargo/commands/rustc.rs

@@ -52,6 +52,7 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help rustc</>` for more detailed information.\n"

src/bin/cargo/commands/rustdoc.rs

@@ -45,6 +45,7 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help rustdoc</>` for more detailed information.\n"

src/bin/cargo/commands/test.rs

@@ -60,6 +60,7 @@ pub fn cli() -> Command {
         .arg_unit_graph()
         .arg_timings()
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help test</>` for more detailed information.\n\

src/bin/cargo/commands/tree.rs

@@ -95,6 +95,7 @@ pub fn cli() -> Command {
             Pass `all` to include all targets.",
         )
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help tree</>` for more detailed information.\n"
         ))

src/bin/cargo/commands/update.rs

@@ -49,6 +49,7 @@ pub fn cli() -> Command {
                 .help_heading(heading::PACKAGE_SELECTION),
         )
         .arg_manifest_path()
+        .arg_lockfile_path()
         .arg_ignore_rust_version_with_help(
             "Ignore `rust-version` specification in packages (unstable)",
         )

src/bin/cargo/commands/vendor.rs

@@ -37,6 +37,7 @@ pub fn cli() -> Command {
         .arg(unsupported("only-git-deps"))
         .arg(unsupported("disallow-duplicates"))
         .arg_manifest_path()
+        .arg_lockfile_path()
         .after_help(color_print::cstr!(
             "Run `<cyan,bold>cargo help vendor</>` for more detailed information.\n"
         ))

src/cargo/core/workspace.rs

@@ -103,6 +103,9 @@ pub struct Workspace<'gctx> {
     // file. This is set for `cargo install` without `--locked`.
     ignore_lock: bool,
 
+    /// Requested path of the lockfile (i.e. passed as the cli flag)
+    requested_lockfile_path: Option<PathBuf>,
+
     /// The resolver behavior specified with the `resolver` field.
     resolve_behavior: ResolveBehavior,
     resolve_honors_rust_version: bool,
@@ -237,6 +240,7 @@ impl<'gctx> Workspace<'gctx> {
             require_optional_deps: true,
             loaded_packages: RefCell::new(HashMap::new()),
             ignore_lock: false,
+            requested_lockfile_path: None,
             resolve_behavior: ResolveBehavior::V1,
             resolve_honors_rust_version: false,
             custom_metadata: None,
@@ -647,6 +651,31 @@ impl<'gctx> Workspace<'gctx> {
         self
     }
 
+    /// Returns the directory where the lockfile is in.
+    pub fn lock_root(&self) -> Filesystem {
+        if let Some(requested) = self.requested_lockfile_path.as_ref() {
+            return Filesystem::new(
+                requested
+                    .parent()
+                    .expect("Lockfile path can't be root")
+                    .to_owned(),
+            );
+        }
+        self.default_lock_root()
+    }
+
+    fn default_lock_root(&self) -> Filesystem {
+        if self.root_maybe().is_embedded() {
+            self.target_dir()
+        } else {
+            Filesystem::new(self.root().to_owned())
+        }
+    }
+
+    pub fn set_requested_lockfile_path(&mut self, path: Option<PathBuf>) {
+        self.requested_lockfile_path = path;
+    }
+
     /// Get the lowest-common denominator `package.rust-version` within the workspace, if specified
     /// anywhere
     pub fn rust_version(&self) -> Option<&RustVersion> {

src/cargo/ops/cargo_package.rs

@@ -6,13 +6,15 @@ use std::path::{Path, PathBuf};
 use std::sync::Arc;
 use std::task::Poll;
 
+use super::RegistryOrIndex;
 use crate::core::compiler::{BuildConfig, CompileMode, DefaultExecutor, Executor};
 use crate::core::dependency::DepKind;
 use crate::core::manifest::Target;
 use crate::core::resolver::CliFeatures;
 use crate::core::resolver::HasDevUnits;
 use crate::core::{Feature, PackageIdSpecQuery, Shell, Verbosity, Workspace};
 use crate::core::{Package, PackageId, PackageSet, Resolve, SourceId};
+use crate::ops::lockfile::LOCKFILE_NAME;
 use crate::sources::registry::index::{IndexPackage, RegistryDependency};
 use crate::sources::{PathSource, SourceConfigMap, CRATES_IO_REGISTRY};
 use crate::util::cache_lock::CacheLockMode;
@@ -32,8 +34,6 @@ use tar::{Archive, Builder, EntryType, Header, HeaderMode};
 use tracing::debug;
 use unicase::Ascii as UncasedAscii;
 
-use super::RegistryOrIndex;
-
 #[derive(Clone)]
 pub struct PackageOpts<'gctx> {
     pub gctx: &'gctx GlobalContext,
@@ -248,7 +248,12 @@ pub fn package(ws: &Workspace<'_>, opts: &PackageOpts<'_>) -> CargoResult<Vec<Fi
     }
     let pkgs = ws.members_with_features(specs, &opts.cli_features)?;
 
-    if ws.root().join("Cargo.lock").exists() {
+    if ws
+        .lock_root()
+        .as_path_unlocked()
+        .join(LOCKFILE_NAME)
+        .exists()
+    {
         // Make sure the Cargo.lock is up-to-date and valid.
         let dry_run = false;
         let _ = ops::resolve_ws(ws, dry_run)?;

src/cargo/ops/fix.rs

@@ -97,6 +97,7 @@ pub struct FixOptions {
     pub allow_no_vcs: bool,
     pub allow_staged: bool,
     pub broken_code: bool,
+    pub requested_lockfile_path: Option<PathBuf>,
 }
 
 pub fn fix(
@@ -121,6 +122,7 @@ pub fn fix(
     }
     let mut ws = Workspace::new(&root_manifest, gctx)?;
     ws.set_resolve_honors_rust_version(Some(original_ws.resolve_honors_rust_version()));
+    ws.set_requested_lockfile_path(opts.requested_lockfile_path.clone());
 
     // Spin up our lock server, which our subprocesses will use to synchronize fixes.
     let lock_server = LockServer::new()?;

src/cargo/ops/lockfile.rs

@@ -6,14 +6,16 @@ use crate::util::Filesystem;
 
 use anyhow::Context as _;
 
+pub const LOCKFILE_NAME: &str = "Cargo.lock";
+
 #[tracing::instrument(skip_all)]
 pub fn load_pkg_lockfile(ws: &Workspace<'_>) -> CargoResult<Option<Resolve>> {
-    let lock_root = lock_root(ws);
-    if !lock_root.as_path_unlocked().join("Cargo.lock").exists() {
+    let lock_root = ws.lock_root();
+    if !lock_root.as_path_unlocked().join(LOCKFILE_NAME).exists() {
         return Ok(None);
     }
 
-    let mut f = lock_root.open_ro_shared("Cargo.lock", ws.gctx(), "Cargo.lock file")?;
+    let mut f = lock_root.open_ro_shared(LOCKFILE_NAME, ws.gctx(), "Cargo.lock file")?;
 
     let mut s = String::new();
     f.read_to_string(&mut s)
@@ -58,7 +60,7 @@ pub fn write_pkg_lockfile(ws: &Workspace<'_>, resolve: &mut Resolve) -> CargoRes
             "the lock file {} needs to be updated but {} was passed to prevent this\n\
              If you want to try to generate the lock file without accessing the network, \
              remove the {} flag and use --offline instead.",
-            lock_root.as_path_unlocked().join("Cargo.lock").display(),
+            lock_root.as_path_unlocked().join(LOCKFILE_NAME).display(),
             flag,
             flag
         );
@@ -82,9 +84,13 @@ pub fn write_pkg_lockfile(ws: &Workspace<'_>, resolve: &mut Resolve) -> CargoRes
         anyhow::bail!("lock file version `{current_version:?}` requires `-Znext-lockfile-bump`")
     }
 
+    if !lock_root.as_path_unlocked().exists() {
+        lock_root.create_dir()?;
+    }
+
     // Ok, if that didn't work just write it out
     lock_root
-        .open_rw_exclusive_create("Cargo.lock", ws.gctx(), "Cargo.lock file")
+        .open_rw_exclusive_create(LOCKFILE_NAME, ws.gctx(), "Cargo.lock file")
         .and_then(|mut f| {
             f.file().set_len(0)?;
             f.write_all(out.as_bytes())?;
@@ -93,7 +99,7 @@ pub fn write_pkg_lockfile(ws: &Workspace<'_>, resolve: &mut Resolve) -> CargoRes
         .with_context(|| {
             format!(
                 "failed to write {}",
-                lock_root.as_path_unlocked().join("Cargo.lock").display()
+                lock_root.as_path_unlocked().join(LOCKFILE_NAME).display()
             )
         })?;
     Ok(true)
@@ -104,8 +110,8 @@ fn resolve_to_string_orig(
     resolve: &Resolve,
 ) -> (Option<String>, String, Filesystem) {
     // Load the original lock file if it exists.
-    let lock_root = lock_root(ws);
-    let orig = lock_root.open_ro_shared("Cargo.lock", ws.gctx(), "Cargo.lock file");
+    let lock_root = ws.lock_root();
+    let orig = lock_root.open_ro_shared(LOCKFILE_NAME, ws.gctx(), "Cargo.lock file");
     let orig = orig.and_then(|mut f| {
         let mut s = String::new();
         f.read_to_string(&mut s)?;
@@ -245,11 +251,3 @@ fn emit_package(dep: &toml::Table, out: &mut String) {
         out.push_str(&format!("replace = {}\n\n", &dep["replace"]));
     }
 }
-
-fn lock_root(ws: &Workspace<'_>) -> Filesystem {
-    if ws.root_maybe().is_embedded() {
-        ws.target_dir()
-    } else {
-        Filesystem::new(ws.root().to_owned())
-    }
-}