Stabilize offline mode.

src/bin/cargo/cli.rs

@@ -32,7 +32,6 @@ Available unstable (nightly-only) flags:
     -Z avoid-dev-deps   -- Avoid installing dev-dependencies if possible
     -Z minimal-versions -- Install minimal dependency versions instead of maximum
     -Z no-index-update  -- Do not update the registry, avoids a network request for benchmarking
-    -Z offline          -- Offline mode that does not perform network requests
     -Z unstable-options -- Allow the usage of unstable options such as --registry
     -Z config-profile   -- Read profiles from .cargo/config files
     -Z install-upgrade  -- `cargo install` will upgrade instead of failing
@@ -168,6 +167,7 @@ fn execute_subcommand(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
         &args.value_of("color").map(|s| s.to_string()),
         args.is_present("frozen"),
         args.is_present("locked"),
+        args.is_present("offline"),
         arg_target_dir,
         &args
             .values_of_lossy("unstable-features")
@@ -239,6 +239,7 @@ See 'cargo help <command>' for more information on a specific command.\n",
         )
         .arg(opt("frozen", "Require Cargo.lock and cache are up to date").global(true))
         .arg(opt("locked", "Require Cargo.lock is up to date").global(true))
+        .arg(opt("offline", "Run without accessing the network").global(true))
         .arg(
             Arg::with_name("unstable-features")
                 .help("Unstable (nightly-only) flags to Cargo, see 'cargo -Z help' for details")

src/cargo/core/features.rs

@@ -322,7 +322,6 @@ impl Features {
 pub struct CliUnstable {
     pub print_im_a_teapot: bool,
     pub unstable_options: bool,
-    pub offline: bool,
     pub no_index_update: bool,
     pub avoid_dev_deps: bool,
     pub minimal_versions: bool,
@@ -367,7 +366,6 @@ impl CliUnstable {
         match k {
             "print-im-a-teapot" => self.print_im_a_teapot = parse_bool(v)?,
             "unstable-options" => self.unstable_options = true,
-            "offline" => self.offline = true,
             "no-index-update" => self.no_index_update = true,
             "avoid-dev-deps" => self.avoid_dev_deps = true,
             "minimal-versions" => self.minimal_versions = true,

src/cargo/core/resolver/errors.rs

@@ -299,9 +299,9 @@ pub(super) fn activation_error(
     };
 
     if let Some(config) = config {
-        if config.cli_unstable().offline {
+        if config.offline() {
             msg.push_str(
-                "\nAs a reminder, you're using offline mode (-Z offline) \
+                "\nAs a reminder, you're using offline mode (--offline) \
                  which can sometimes cause surprising resolution failures, \
                  if this error is too confusing you may wish to retry \
                  without the offline flag.",

src/cargo/ops/cargo_generate_lockfile.rs

@@ -36,7 +36,7 @@ pub fn update_lockfile(ws: &Workspace<'_>, opts: &UpdateOptions<'_>) -> CargoRes
         failure::bail!("you can't generate a lockfile for an empty workspace.")
     }
 
-    if opts.config.cli_unstable().offline {
+    if opts.config.offline() {
         failure::bail!("you can't update in the offline mode");
     }
 

src/cargo/ops/lockfile.rs

@@ -47,7 +47,7 @@ pub fn write_pkg_lockfile(ws: &Workspace<'_>, resolve: &Resolve) -> CargoResult<
     }
 
     if !ws.config().lock_update_allowed() {
-        if ws.config().cli_unstable().offline {
+        if ws.config().offline() {
             failure::bail!("can't update in the offline mode");
         }
 

src/cargo/sources/git/source.rs

@@ -158,9 +158,9 @@ impl<'cfg> Source for GitSource<'cfg> {
         let git_path = self.config.assert_package_cache_locked(&git_path);
         let db_path = git_path.join("db").join(&self.ident);
 
-        if self.config.cli_unstable().offline && !db_path.exists() {
+        if self.config.offline() && !db_path.exists() {
             failure::bail!(
-                "can't checkout from '{}': you are in the offline mode (-Z offline)",
+                "can't checkout from '{}': you are in the offline mode (--offline)",
                 self.remote.url()
             );
         }
@@ -172,7 +172,7 @@ impl<'cfg> Source for GitSource<'cfg> {
         let actual_rev = self.remote.rev_for(&db_path, &self.reference);
         let should_update = actual_rev.is_err() || self.source_id.precise().is_none();
 
-        let (db, actual_rev) = if should_update && !self.config.cli_unstable().offline {
+        let (db, actual_rev) = if should_update && !self.config.offline() {
             self.config.shell().status(
                 "Updating",
                 format!("git repository `{}`", self.remote.url()),

src/cargo/sources/registry/index.rs

@@ -363,7 +363,7 @@ impl<'cfg> RegistryIndex<'cfg> {
         yanked_whitelist: &HashSet<PackageId>,
         f: &mut dyn FnMut(Summary),
     ) -> CargoResult<()> {
-        if self.config.cli_unstable().offline
+        if self.config.offline()
             && self.query_inner_with_online(dep, load, yanked_whitelist, f, false)? != 0
         {
             return Ok(());

src/cargo/sources/registry/remote.rs

@@ -182,7 +182,7 @@ impl<'cfg> RegistryData for RemoteRegistry<'cfg> {
     }
 
     fn update_index(&mut self) -> CargoResult<()> {
-        if self.config.cli_unstable().offline {
+        if self.config.offline() {
             if self.repo()?.is_empty()? {
                 // An empty repository is guaranteed to fail, since hitting
                 // this path means we need at least one crate. This is an

src/cargo/util/config.rs

@@ -52,10 +52,15 @@ pub struct Config {
     rustdoc: LazyCell<PathBuf>,
     /// Whether we are printing extra verbose messages
     extra_verbose: bool,
-    /// `frozen` is set if we shouldn't access the network
+    /// `frozen` is the same as `locked`, but additionally will not access the
+    /// network to determine if the lock file is out-of-date.
     frozen: bool,
-    /// `locked` is set if we should not update lock files
+    /// `locked` is set if we should not update lock files. If the lock file
+    /// is missing, or needs to be updated, an error is produced.
     locked: bool,
+    /// `offline` is set if we should never access the network, but otherwise
+    /// continue operating if possible.
+    offline: bool,
     /// A global static IPC control mechanism (used for managing parallel builds)
     jobserver: Option<jobserver::Client>,
     /// Cli flags of the form "-Z something"
@@ -119,6 +124,7 @@ impl Config {
             extra_verbose: false,
             frozen: false,
             locked: false,
+            offline: false,
             jobserver: unsafe {
                 if GLOBAL_JOBSERVER.is_null() {
                     None
@@ -560,6 +566,7 @@ impl Config {
         color: &Option<String>,
         frozen: bool,
         locked: bool,
+        offline: bool,
         target_dir: &Option<PathBuf>,
         unstable_flags: &[String],
     ) -> CargoResult<()> {
@@ -604,6 +611,11 @@ impl Config {
         self.extra_verbose = extra_verbose;
         self.frozen = frozen;
         self.locked = locked;
+        self.offline = offline
+            || self
+                .get::<Option<bool>>("net.offline")
+                .unwrap_or(None)
+                .unwrap_or(false);
         self.target_dir = cli_target_dir;
         self.cli_flags.parse(unstable_flags)?;
 
@@ -619,7 +631,11 @@ impl Config {
     }
 
     pub fn network_allowed(&self) -> bool {
-        !self.frozen() && !self.cli_unstable().offline
+        !self.frozen() && !self.offline()
+    }
+
+    pub fn offline(&self) -> bool {
+        self.offline
     }
 
     pub fn frozen(&self) -> bool {

src/doc/man/cargo-fetch.adoc

@@ -23,6 +23,10 @@ file before fetching the dependencies.
 
 If `--target` is not specified, then all target dependencies are fetched.
 
+See also the link:https://crates.io/crates/cargo-prefetch[cargo-prefetch]
+plugin which adds a command to download popular crates. This may be useful if
+you plan to use Cargo without a network with the `--offline` flag.
+
 == OPTIONS
 
 === Fetch options

src/doc/man/cargo-install.adoc

@@ -100,6 +100,10 @@ include::options-target-triple.adoc[]
 *--debug*::
     Build with the `dev` profile instead the `release` profile.
 
+=== Manifest Options
+
+include::options-locked.adoc[]
+
 === Miscellaneous Options
 
 include::options-jobs.adoc[]

src/doc/man/generated/cargo-bench.html

@@ -341,6 +341,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-build.html

@@ -286,6 +286,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-check.html

@@ -277,6 +277,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-clean.html

@@ -141,6 +141,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-doc.html

@@ -245,6 +245,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-fetch.html

@@ -26,6 +26,11 @@ file before fetching the dependencies.</p>
 <div class="paragraph">
 <p>If <code>--target</code> is not specified, then all target dependencies are fetched.</p>
 </div>
+<div class="paragraph">
+<p>See also the <a href="https://crates.io/crates/cargo-prefetch">cargo-prefetch</a>
+plugin which adds a command to download popular crates. This may be useful if
+you plan to use Cargo without a network with the <code>--offline</code> flag.</p>
+</div>
 </div>
 </div>
 <div class="sect1">
@@ -113,6 +118,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-fix.html

@@ -348,6 +348,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-generate-lockfile.html

@@ -91,6 +91,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-install.html

@@ -187,6 +187,43 @@ list of supported targets.</p>
 </div>
 </div>
 <div class="sect2">
+<h3 id="cargo_install_manifest_options">Manifest Options</h3>
+<div class="dlist">
+<dl>
+<dt class="hdlist1"><strong>--frozen</strong></dt>
+<dt class="hdlist1"><strong>--locked</strong></dt>
+<dd>
+<p>Either of these flags requires that the <code>Cargo.lock</code> file is
+up-to-date. If the lock file is missing, or it needs to be updated, Cargo will
+exit with an error. The <code>--frozen</code> flag also prevents Cargo from
+attempting to access the network to determine if it is out-of-date.</p>
+<div class="paragraph">
+<p>These may be used in environments where you want to assert that the
+<code>Cargo.lock</code> file is up-to-date (such as a CI build) or want to avoid network
+access.</p>
+</div>
+</dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
+</dl>
+</div>
+</div>
+<div class="sect2">
 <h3 id="cargo_install_miscellaneous_options">Miscellaneous Options</h3>
 <div class="dlist">
 <dl>

src/doc/man/generated/cargo-metadata.html

@@ -363,6 +363,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-package.html

@@ -170,6 +170,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-pkgid.html

@@ -150,6 +150,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-publish.html

@@ -169,6 +169,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-run.html

@@ -207,6 +207,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-rustc.html

@@ -269,6 +269,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-rustdoc.html

@@ -282,6 +282,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-test.html

@@ -366,6 +366,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-update.html

@@ -125,6 +125,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo-verify-project.html

@@ -99,6 +99,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/generated/cargo.html

@@ -265,6 +265,23 @@ attempting to access the network to determine if it is out-of-date.</p>
 access.</p>
 </div>
 </dd>
+<dt class="hdlist1"><strong>--offline</strong></dt>
+<dd>
+<p>Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.</p>
+<div class="paragraph">
+<p>Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the <a href="commands/cargo-fetch.html">cargo-fetch(1)</a> command to download dependencies before going
+offline.</p>
+</div>
+<div class="paragraph">
+<p>May also be specified with the <code>net.offline</code> <a href="reference/config.html">config value</a>.</p>
+</div>
+</dd>
 </dl>
 </div>
 </div>

src/doc/man/options-locked.adoc

@@ -8,3 +8,17 @@
 These may be used in environments where you want to assert that the
 `Cargo.lock` file is up-to-date (such as a CI build) or want to avoid network
 access.
+
+*--offline*::
+    Prevents Cargo from accessing the network for any reason. Without this
+    flag, Cargo will stop with an error if it needs to access the network and
+    the network is not available. With this flag, Cargo will attempt to
+    proceed without the network if possible.
++
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the man:cargo-fetch[1] command to download dependencies before going
+offline.
++
+May also be specified with the `net.offline` linkcargo:reference/config.html[config value].

src/doc/src/reference/config.md

@@ -141,6 +141,7 @@ color = 'auto'         # whether cargo colorizes output
 [net]
 retry = 2 # number of times a network call will automatically retried
 git-fetch-with-cli = false  # if `true` we'll use `git`-the-CLI to fetch git repos
+offline = false # do not access the network, but otherwise try to proceed if possible
 
 # Alias cargo commands. The first 4 aliases are built in. If your
 # command requires grouped whitespace use the list format.

src/doc/src/reference/unstable.md

@@ -30,19 +30,6 @@ cargo-features = ["publish-lockfile"]
 publish-lockfile = true
 ```
 
-
-### Offline Mode
-* Original Issue: [#4686](https://github.com/rust-lang/cargo/issues/4686)
-* Tracking Issue: [#5655](https://github.com/rust-lang/cargo/issues/5655)
-
-The `-Z offline` flag prevents Cargo from attempting to access the network for
-any reason. Typically Cargo will stop with an error if it wants to access the
-network and it is not available.
-
-Beware that this may result in different dependency resolution than online
-mode. Cargo will restrict itself to crates that are available locally, even
-if there might be a newer version as indicated in the local copy of the index.
-
 ### no-index-update
 * Original Issue: [#3479](https://github.com/rust-lang/cargo/issues/3479)
 

src/etc/man/cargo-bench.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-bench
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-23
+.\"      Date: 2019-05-08
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-BENCH" "1" "2018-12-23" "\ \&" "\ \&"
+.TH "CARGO\-BENCH" "1" "2019-05-08" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -401,6 +401,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-build.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-build
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2019-03-28
+.\"      Date: 2019-05-08
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-BUILD" "1" "2019-03-28" "\ \&" "\ \&"
+.TH "CARGO\-BUILD" "1" "2019-05-08" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -324,6 +324,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-check.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-check
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-CHECK" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-CHECK" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -310,6 +310,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-clean.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-clean
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-CLEAN" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-CLEAN" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -158,6 +158,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-doc.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-doc
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-DOC" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-DOC" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -267,6 +267,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-fetch.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-fetch
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-05-12
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-FETCH" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-FETCH" "1" "2019-05-12" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -43,6 +43,11 @@ If the lock file is not available, then this command will generate the lock
 file before fetching the dependencies.
 .sp
 If \fB\-\-target\fP is not specified, then all target dependencies are fetched.
+.sp
+See also the \c
+.URL "https://crates.io/crates/cargo\-prefetch" "cargo\-prefetch"
+plugin which adds a command to download popular crates. This may be useful if
+you plan to use Cargo without a network with the \fB\-\-offline\fP flag.
 .SH "OPTIONS"
 .SS "Fetch options"
 .sp
@@ -131,6 +136,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-fix.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-fix
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-FIX" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-FIX" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -380,6 +380,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-generate-lockfile.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-generate-lockfile
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-GENERATE\-LOCKFILE" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-GENERATE\-LOCKFILE" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -116,6 +116,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-install.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-install
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2019-03-31
+.\"      Date: 2019-05-12
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-INSTALL" "1" "2019-03-31" "\ \&" "\ \&"
+.TH "CARGO\-INSTALL" "1" "2019-05-12" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -235,6 +235,36 @@ This may also be specified with the \fBbuild.target\fP
 .RS 4
 Build with the \fBdev\fP profile instead the \fBrelease\fP profile.
 .RE
+.SS "Manifest Options"
+.sp
+\fB\-\-frozen\fP, \fB\-\-locked\fP
+.RS 4
+Either of these flags requires that the \fBCargo.lock\fP file is
+up\-to\-date. If the lock file is missing, or it needs to be updated, Cargo will
+exit with an error. The \fB\-\-frozen\fP flag also prevents Cargo from
+attempting to access the network to determine if it is out\-of\-date.
+.sp
+These may be used in environments where you want to assert that the
+\fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
+access.
+.RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Miscellaneous Options"
 .sp
 \fB\-j\fP \fIN\fP, \fB\-\-jobs\fP \fIN\fP

src/etc/man/cargo-metadata.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-metadata
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2019-01-05
+.\"      Date: 2019-05-08
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-METADATA" "1" "2019-01-05" "\ \&" "\ \&"
+.TH "CARGO\-METADATA" "1" "2019-05-08" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -376,6 +376,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-pkgid.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-pkgid
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-PKGID" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-PKGID" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -193,6 +193,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-publish.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-publish
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2019-02-13
+.\"      Date: 2019-05-08
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-PUBLISH" "1" "2019-02-13" "\ \&" "\ \&"
+.TH "CARGO\-PUBLISH" "1" "2019-05-08" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -201,6 +201,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Miscellaneous Options"
 .sp
 \fB\-j\fP \fIN\fP, \fB\-\-jobs\fP \fIN\fP

src/etc/man/cargo-run.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-run
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2019-02-05
+.\"      Date: 2019-05-08
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-RUN" "1" "2019-02-05" "\ \&" "\ \&"
+.TH "CARGO\-RUN" "1" "2019-05-08" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -229,6 +229,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-rustc.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-rustc
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-RUSTC" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-RUSTC" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -299,6 +299,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-rustdoc.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-rustdoc
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-RUSTDOC" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-RUSTDOC" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -307,6 +307,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-test.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-test
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-23
+.\"      Date: 2019-05-08
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-TEST" "1" "2018-12-23" "\ \&" "\ \&"
+.TH "CARGO\-TEST" "1" "2019-05-08" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -443,6 +443,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-update.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-update
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-23
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-UPDATE" "1" "2018-12-23" "\ \&" "\ \&"
+.TH "CARGO\-UPDATE" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -146,6 +146,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

src/etc/man/cargo-verify-project.1

@@ -2,12 +2,12 @@
 .\"     Title: cargo-verify-project
 .\"    Author: [see the "AUTHOR(S)" section]
 .\" Generator: Asciidoctor 1.5.8
-.\"      Date: 2018-12-20
+.\"      Date: 2019-04-16
 .\"    Manual: \ \&
 .\"    Source: \ \&
 .\"  Language: English
 .\"
-.TH "CARGO\-VERIFY\-PROJECT" "1" "2018-12-20" "\ \&" "\ \&"
+.TH "CARGO\-VERIFY\-PROJECT" "1" "2019-04-16" "\ \&" "\ \&"
 .ie \n(.g .ds Aq \(aq
 .el       .ds Aq '
 .ss \n[.ss] 0
@@ -126,6 +126,23 @@ These may be used in environments where you want to assert that the
 \fBCargo.lock\fP file is up\-to\-date (such as a CI build) or want to avoid network
 access.
 .RE
+.sp
+\fB\-\-offline\fP
+.RS 4
+Prevents Cargo from accessing the network for any reason. Without this
+flag, Cargo will stop with an error if it needs to access the network and
+the network is not available. With this flag, Cargo will attempt to
+proceed without the network if possible.
+.sp
+Beware that this may result in different dependency resolution than online
+mode. Cargo will restrict itself to crates that are downloaded locally, even
+if there might be a newer version as indicated in the local copy of the index.
+See the \fBcargo\-fetch\fP(1) command to download dependencies before going
+offline.
+.sp
+May also be specified with the \fBnet.offline\fP \c
+.URL "https://doc.rust\-lang.org/cargo/reference/config.html" "config value" "."
+.RE
 .SS "Common Options"
 .sp
 \fB\-h\fP, \fB\-\-help\fP

tests/testsuite/config.rs

@@ -61,6 +61,7 @@ fn new_config(env: &[(&str, &str)]) -> Config {
             &None,
             false,
             false,
+            false,
             &None,
             &["advanced-env".into()],
         )

tests/testsuite/offline.rs

@@ -3,7 +3,7 @@ use std::fs;
 
 #[test]
 fn offline_unused_target_dep() {
-    // -Z offline with a target dependency that is not used and not downloaded.
+    // --offline with a target dependency that is not used and not downloaded.
     Package::new("unused_dep", "1.0.0").publish();
     Package::new("used_dep", "1.0.0").publish();
     let p = project()
@@ -28,9 +28,7 @@ fn offline_unused_target_dep() {
         .run();
     p.cargo("clean").run();
     // Build offline, make sure it works.
-    p.cargo("build -Z offline")
-        .masquerade_as_nightly_cargo()
-        .run();
+    p.cargo("build --offline").run();
 }
 
 #[test]
@@ -55,11 +53,8 @@ fn offline_missing_optional() {
         .run();
     p.cargo("clean").run();
     // Build offline, make sure it works.
-    p.cargo("build -Z offline")
-        .masquerade_as_nightly_cargo()
-        .run();
-    p.cargo("build -Z offline --features=opt_dep")
-        .masquerade_as_nightly_cargo()
+    p.cargo("build --offline").run();
+    p.cargo("build --offline --features=opt_dep")
         .with_stderr(
             "\
 [ERROR] failed to download `opt_dep v1.0.0`
@@ -92,9 +87,7 @@ fn cargo_compile_path_with_offline() {
         .file("bar/src/lib.rs", "")
         .build();
 
-    p.cargo("build -Zoffline")
-        .masquerade_as_nightly_cargo()
-        .run();
+    p.cargo("build --offline").run();
 }
 
 #[test]
@@ -137,8 +130,7 @@ fn cargo_compile_with_downloaded_dependency_with_offline() {
         .file("src/lib.rs", "")
         .build();
 
-    p2.cargo("build -Zoffline")
-        .masquerade_as_nightly_cargo()
+    p2.cargo("build --offline")
         .with_stderr(
             "\
 [COMPILING] present_dep v1.2.3
@@ -166,8 +158,7 @@ fn cargo_compile_offline_not_try_update() {
         .file("src/lib.rs", "")
         .build();
 
-    p.cargo("build -Zoffline")
-        .masquerade_as_nightly_cargo()
+    p.cargo("build --offline")
         .with_status(101)
         .with_stderr(
             "\
@@ -183,6 +174,12 @@ project directory before going offline.
 ",
         )
         .run();
+
+    p.change_file(".cargo/config", "net.offline = true");
+    p.cargo("build")
+        .with_status(101)
+        .with_stderr_contains("[..]Unable to update registry[..]")
+        .run();
 }
 
 #[test]
@@ -242,8 +239,7 @@ fn main(){
         )
         .build();
 
-    p2.cargo("run -Zoffline")
-        .masquerade_as_nightly_cargo()
+    p2.cargo("run --offline")
         .with_stderr(
             "\
 [COMPILING] present_dep v1.2.3
@@ -274,15 +270,14 @@ fn cargo_compile_forbird_git_httpsrepo_offline() {
         .file("src/main.rs", "")
         .build();
 
-    p.cargo("build -Zoffline").masquerade_as_nightly_cargo().with_status(101).
-                    with_stderr("\
+    p.cargo("build --offline").with_status(101).with_stderr("\
 error: failed to load source for a dependency on `dep1`
 
 Caused by:
   Unable to update https://github.com/some_user/dep1.git
 
 Caused by:
-  can't checkout from 'https://github.com/some_user/dep1.git': you are in the offline mode (-Z offline)").run();
+  can't checkout from 'https://github.com/some_user/dep1.git': you are in the offline mode (--offline)").run();
 }
 
 #[test]
@@ -321,8 +316,7 @@ fn compile_offline_while_transitive_dep_not_cached() {
     // Restore the file contents.
     fs::write(&baz_path, &baz_content).unwrap();
 
-    p.cargo("build -Zoffline")
-        .masquerade_as_nightly_cargo()
+    p.cargo("build --offline")
         .with_status(101)
         .with_stderr(
             "\
@@ -352,8 +346,7 @@ fn update_offline() {
         )
         .file("src/main.rs", "fn main() {}")
         .build();
-    p.cargo("update -Zoffline")
-        .masquerade_as_nightly_cargo()
+    p.cargo("update --offline")
         .with_status(101)
         .with_stderr("error: you can't update in the offline mode[..]")
         .run();
@@ -448,8 +441,7 @@ fn cargo_compile_offline_with_cached_git_dep() {
 
     let git_root = git_project.root();
 
-    p.cargo("build -Zoffline")
-        .masquerade_as_nightly_cargo()
+    p.cargo("build --offline")
         .with_stderr(format!(
             "\
 [COMPILING] dep1 v0.5.0 ({}#[..])
@@ -482,9 +474,7 @@ fn cargo_compile_offline_with_cached_git_dep() {
         ),
     );
 
-    p.cargo("build -Zoffline")
-        .masquerade_as_nightly_cargo()
-        .run();
+    p.cargo("build --offline").run();
     p.process(&p.bin("foo"))
         .with_stdout("hello from cached git repo rev1\n")
         .run();
@@ -531,8 +521,7 @@ fn offline_resolve_optional_fail() {
             "#,
     );
 
-    p.cargo("build -Z offline")
-        .masquerade_as_nightly_cargo()
+    p.cargo("build --offline")
         .with_status(101)
         .with_stderr("\
 [ERROR] failed to select a version for the requirement `dep = \"^2.0\"`
@@ -540,7 +529,7 @@ fn offline_resolve_optional_fail() {
   location searched: `[..]` index (which is replacing registry `https://github.com/rust-lang/crates.io-index`)
 required by package `foo v0.1.0 ([..]/foo)`
 perhaps a crate was updated and forgotten to be re-vendored?
-As a reminder, you're using offline mode (-Z offline) which can sometimes cause \
+As a reminder, you're using offline mode (--offline) which can sometimes cause \
 surprising resolution failures, if this error is too confusing you may wish to \
 retry without the offline flag.
 ")

tests/testsuite/resolve.rs

@@ -68,6 +68,7 @@ proptest! {
                 &None,
                 false,
                 false,
+                false,
                 &None,
                 &["minimal-versions".to_string()],
             )
@@ -533,6 +534,7 @@ fn test_resolving_minimum_version_with_transitive_deps() {
             &None,
             false,
             false,
+            false,
             &None,
             &["minimal-versions".to_string()],
         )