Auto merge of #13992 - epage:config, r=weihanglo

fix(config): Ensure `--config net.git-fetch-with-cli=true` is respected

### What does this PR try to resolve?

#13479 changed the global context initialization order so that command line stuff is processed after we read some config.
This had a side effect of breaking `--config net.git-fetch-with-cli=true`.
I reverted the change to restore support for `--config`.

Fixes #13991

### How should we test and review this PR?

### Additional information

This reverts commit f525e1f.

This removes color control from warnings for unstable features.
For some reason this removed color support from `cargo -Zhelp` in the
tests but I can't reproduce it locally.

The most important thing was getting the config fix in.
There are two follow ups
- Can we have the config working *and* color?
- Why did this fail for this field and not the others we already had
  tests for?

I ran out my immediate time box for looking into these.

src/cargo/util/context/mod.rs

@@ -1020,6 +1020,31 @@ impl GlobalContext {
         unstable_flags: &[String],
         cli_config: &[String],
     ) -> CargoResult<()> {
+        for warning in self
+            .unstable_flags
+            .parse(unstable_flags, self.nightly_features_allowed)?
+        {
+            self.shell().warn(warning)?;
+        }
+        if !unstable_flags.is_empty() {
+            // store a copy of the cli flags separately for `load_unstable_flags_from_config`
+            // (we might also need it again for `reload_rooted_at`)
+            self.unstable_flags_cli = Some(unstable_flags.to_vec());
+        }
+        if !cli_config.is_empty() {
+            self.cli_config = Some(cli_config.iter().map(|s| s.to_string()).collect());
+            self.merge_cli_args()?;
+        }
+        if self.unstable_flags.config_include {
+            // If the config was already loaded (like when fetching the
+            // `[alias]` table), it was loaded with includes disabled because
+            // the `unstable_flags` hadn't been set up, yet. Any values
+            // fetched before this step will not process includes, but that
+            // should be fine (`[alias]` is one of the only things loaded
+            // before configure). This can be removed when stabilized.
+            self.reload_rooted_at(self.cwd.clone())?;
+        }
+
         // Ignore errors in the configuration files. We don't want basic
         // commands like `cargo version` to error out due to config file
         // problems.
@@ -1066,31 +1091,6 @@ impl GlobalContext {
         let cli_target_dir = target_dir.as_ref().map(|dir| Filesystem::new(dir.clone()));
         self.target_dir = cli_target_dir;
 
-        for warning in self
-            .unstable_flags
-            .parse(unstable_flags, self.nightly_features_allowed)?
-        {
-            self.shell().warn(warning)?;
-        }
-        if !unstable_flags.is_empty() {
-            // store a copy of the cli flags separately for `load_unstable_flags_from_config`
-            // (we might also need it again for `reload_rooted_at`)
-            self.unstable_flags_cli = Some(unstable_flags.to_vec());
-        }
-        if !cli_config.is_empty() {
-            self.cli_config = Some(cli_config.iter().map(|s| s.to_string()).collect());
-            self.merge_cli_args()?;
-        }
-        if self.unstable_flags.config_include {
-            // If the config was already loaded (like when fetching the
-            // `[alias]` table), it was loaded with includes disabled because
-            // the `unstable_flags` hadn't been set up, yet. Any values
-            // fetched before this step will not process includes, but that
-            // should be fine (`[alias]` is one of the only things loaded
-            // before configure). This can be removed when stabilized.
-            self.reload_rooted_at(self.cwd.clone())?;
-        }
-
         self.load_unstable_flags_from_config()?;
 
         Ok(())

tests/testsuite/config_cli.rs

@@ -11,8 +11,12 @@ use std::{collections::HashMap, fs};
 #[cargo_test]
 fn basic() {
     // Simple example.
-    let gctx = GlobalContextBuilder::new().config_arg("foo='bar'").build();
+    let gctx = GlobalContextBuilder::new()
+        .config_arg("foo='bar'")
+        .config_arg("net.git-fetch-with-cli=true")
+        .build();
     assert_eq!(gctx.get::<String>("foo").unwrap(), "bar");
+    assert_eq!(gctx.net_config().unwrap().git_fetch_with_cli, Some(true));
 }
 
 #[cargo_test]
@@ -39,13 +43,16 @@ fn cli_priority() {
         .env("CARGO_BUILD_JOBS", "2")
         .env("CARGO_BUILD_RUSTC", "env")
         .env("CARGO_TERM_VERBOSE", "false")
+        .env("CARGO_NET_GIT_FETCH_WITH_CLI", "false")
         .config_arg("build.jobs=1")
         .config_arg("build.rustc='cli'")
         .config_arg("term.verbose=true")
+        .config_arg("net.git-fetch-with-cli=true")
         .build();
     assert_eq!(gctx.get::<i32>("build.jobs").unwrap(), 1);
     assert_eq!(gctx.get::<String>("build.rustc").unwrap(), "cli");
     assert_eq!(gctx.get::<bool>("term.verbose").unwrap(), true);
+    assert_eq!(gctx.net_config().unwrap().git_fetch_with_cli, Some(true));
 
     // Setting both term.verbose and term.quiet is invalid and is tested
     // in the run test suite.