env unpack: better no-op handling

Author: relrod

src/env/mod.rs

@@ -131,6 +131,6 @@ pub fn run(config: Config, subcommand: Subcommand) -> Result<(), ExitCode> {
         Subcommand::Activate(args) => activate::run(micromamba, args),
         Subcommand::Deactivate => deactivate::run(),
         Subcommand::Pack(args) => pack::run(micromamba, args, &config),
-        Subcommand::Unpack(args) => unpack::run(micromamba, args),
+        Subcommand::Unpack(args) => unpack::run(micromamba, args, &config),
     }
 }

src/env/unpack.rs

@@ -1,3 +1,4 @@
+use crate::csmrc::Config;
 use crate::env::dump_micromamba_captured_output_on_error;
 use crate::micromamba::Micromamba;
 
@@ -28,7 +29,7 @@ fn archive_name_to_env_name(archive_path: &Path) -> Option<String> {
         .map(String::from)
 }
 
-pub fn run(micromamba: Micromamba, args: Args) -> Result<(), ExitCode> {
+pub fn run(micromamba: Micromamba, args: Args, config: &Config) -> Result<(), ExitCode> {
     let env_name = match args.name {
         Some(name) => name,
         None => match archive_name_to_env_name(&args.archive_path) {
@@ -69,19 +70,22 @@ pub fn run(micromamba: Micromamba, args: Args) -> Result<(), ExitCode> {
     })?;
     let decompressor = flate2::read::GzDecoder::new(archive_file);
     let mut archive = tar::Archive::new(decompressor);
-    archive.unpack(&target_env_path).map_err(|e| {
-        error!(
-            "Could not unpack archive to '{}': {}",
-            target_env_path.display(),
-            e
+    if config.noop_mode {
+        info!("Prepared to unpack the environment. Not actually extracting, due to no-op mode.");
+    } else {
+        archive.unpack(&target_env_path).map_err(|e| {
+            error!(
+                "Could not unpack archive to '{}': {}",
+                target_env_path.display(),
+                e
+            );
+            ExitCode::FAILURE
+        })?;
+        info!(
+            "Successfully unpacked environment to '{}'",
+            target_env_path.display()
         );
-        ExitCode::FAILURE
-    })?;
-    info!(
-        "Successfully unpacked environment to '{}'",
-        target_env_path.display()
-    );
-
+    }
     info!("Running 'conda-unpack' in the new environment to fix paths...");
     let result = micromamba.stream_if_verbose(vec!["run", "--name", &env_name, "conda-unpack"]);
     let rc = result.exit_code();

src/micromamba/mod.rs

@@ -234,6 +234,10 @@ impl<'a> Micromamba<'a> {
     ///
     /// If `force` is true, delete any pre-existing environment/directory at this path.
     pub fn create_env_dir(&self, name: &str, force: bool) -> Result<PathBuf, std::io::Error> {
+        if self.config.noop_mode {
+            info!("Using fake directory path due to no-op mode");
+            return Ok(PathBuf::from("/no-op/mode/path/for/env"));
+        }
         let env_path = match self.path_for_env(name) {
             Some(path) => path,
             None => {