fix: Show pip and uv output by default

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

Author: jjerphan

libmamba/src/api/utils.cpp

@@ -29,7 +29,8 @@ namespace mamba
             const std::string& name,
             const std::string& target_prefix,
             const fs::u8path& spec_file,
-            pip::Update update
+            pip::Update update,
+            const Context::OutputParams& output_params
         )
         {
             const auto get_python_path = [&]
@@ -51,7 +52,13 @@ namespace mamba
             }();
 
             cmd.insert(cmd.end(), { "pip", "install" });
-            command_args cmd_extension = { "-r", spec_file, "--quiet" };
+            command_args cmd_extension = { "-r", spec_file };
+
+            // Only use --quiet when --json or --quiet is used to avoid interfering with output
+            if (output_params.json || output_params.quiet)
+            {
+                cmd_extension.push_back("--quiet");
+            }
 
             if (name != "uv")
             {
@@ -165,7 +172,8 @@ namespace mamba
                 pkg_mgr,
                 ctx.prefix_params.target_prefix.string(),
                 specs.path(),
-                update
+                update,
+                ctx.output_params
             );
             if (maybe_command)
             {

micromamba/tests/test_create.py

@@ -1979,8 +1979,76 @@ def test_create_python_site_packages_path(tmp_home, tmp_root_prefix):
 @pytest.mark.parametrize("shared_pkgs_dirs", [True], indirect=True)
 @pytest.mark.parametrize("env_file", env_files)
 def test_requires_pip_install(tmp_home, tmp_root_prefix, env_file):
-    cmd = ["-p", "myenv", "-f", env_file]
-    helpers.create(*cmd)
+    umamba = helpers.get_umamba()
+
+    # Test 1: By default, pip output should be visible (no --quiet flag)
+    env_prefix_1 = tmp_root_prefix / "envs" / "myenv1"
+    cmd1 = [
+        umamba,
+        "create",
+        "-p",
+        str(env_prefix_1),
+        "-f",
+        str(env_file),
+        "-y",
+        "--no-rc",
+    ] + helpers.channel
+    result1 = subprocess.run(cmd1, capture_output=True, text=True, check=True)
+    # pip typically outputs to stderr, so check for common pip output patterns
+    # Look for pip installation messages like "Collecting", "Installing", "Successfully installed"
+    pip_output_present = (
+        "Collecting" in result1.stderr
+        or "Installing" in result1.stderr
+        or "Successfully installed" in result1.stderr
+        or "Downloading" in result1.stderr
+    )
+    assert pip_output_present, "pip output should be visible by default (no --quiet flag)"
+
+    # Test 2: With --json, pip output should be suppressed (--quiet flag used)
+    env_prefix_2 = tmp_root_prefix / "envs" / "myenv2"
+    cmd2 = [
+        umamba,
+        "create",
+        "-p",
+        str(env_prefix_2),
+        "-f",
+        str(env_file),
+        "-y",
+        "--no-rc",
+        "--json",
+    ] + helpers.channel
+    result2 = subprocess.run(cmd2, capture_output=True, text=True, check=True)
+    # With --quiet, pip should not output installation messages
+    pip_output_suppressed_json = not (
+        "Collecting" in result2.stderr
+        or "Installing" in result2.stderr
+        or "Successfully installed" in result2.stderr
+        or "Downloading" in result2.stderr
+    )
+    assert pip_output_suppressed_json, "pip output should be suppressed when --json is used"
+
+    # Test 3: With --quiet, pip output should be suppressed (--quiet flag used)
+    env_prefix_3 = tmp_root_prefix / "envs" / "myenv3"
+    cmd3 = [
+        umamba,
+        "create",
+        "-p",
+        str(env_prefix_3),
+        "-f",
+        str(env_file),
+        "-y",
+        "--no-rc",
+        "--quiet",
+    ] + helpers.channel
+    result3 = subprocess.run(cmd3, capture_output=True, text=True, check=True)
+    # With --quiet, pip should not output installation messages
+    pip_output_suppressed_quiet = not (
+        "Collecting" in result3.stderr
+        or "Installing" in result3.stderr
+        or "Successfully installed" in result3.stderr
+        or "Downloading" in result3.stderr
+    )
+    assert pip_output_suppressed_quiet, "pip output should be suppressed when --quiet is used"
 
 
 @pytest.mark.parametrize("shared_pkgs_dirs", [True], indirect=True)