Switch a few Task users to direct Command

I never intended the `Task` abstraction to be "the one way to
run subprocesses in bootc"...let's stop using it where:

- We're using `.quiet()` by default so we're not printing the
  description anyways, which is the *main* thing Task does
- We want to parse JSON, where we have a nice new helper

Signed-off-by: Colin Walters <[email protected]>

lib/src/mount.rs

@@ -1,11 +1,13 @@
 //! Helpers for interacting with mountpoints
 
-use anyhow::{anyhow, Context, Result};
+use std::process::Command;
+
+use anyhow::{anyhow, Result};
 use camino::Utf8Path;
 use fn_error_context::context;
 use serde::Deserialize;
 
-use crate::task::Task;
+use crate::{cmdutils::CommandRunExt, task::Task};
 
 #[derive(Deserialize, Debug)]
 #[serde(rename_all = "kebab-case")]
@@ -26,8 +28,7 @@ pub(crate) struct Findmnt {
 }
 
 fn run_findmnt(args: &[&str], path: &str) -> Result<Filesystem> {
-    let desc = format!("Inspecting {path}");
-    let o = Task::new(desc, "findmnt")
+    let o: Findmnt = Command::new("findmnt")
         .args([
             "-J",
             "-v",
@@ -36,9 +37,7 @@ fn run_findmnt(args: &[&str], path: &str) -> Result<Filesystem> {
         ])
         .args(args)
         .arg(path)
-        .quiet()
-        .read()?;
-    let o: Findmnt = serde_json::from_str(&o).context("Parsing findmnt output")?;
+        .run_and_parse_json()?;
     o.filesystems
         .into_iter()
         .next()

lib/src/podman.rs

@@ -3,8 +3,6 @@ use camino::Utf8Path;
 use cap_std_ext::cap_std::fs::Dir;
 use serde::Deserialize;
 
-use crate::task::Task;
-
 /// Where we look inside our container to find our own image
 /// for use with `bootc install`.
 pub(crate) const CONTAINER_STORAGE: &str = "/var/lib/containers";
@@ -26,12 +24,10 @@ pub(crate) struct ImageListEntry {
 /// Given an image ID, return its manifest digest
 #[cfg(feature = "install")]
 pub(crate) fn imageid_to_digest(imgid: &str) -> Result<String> {
-    use crate::install::run_in_host_mountns;
-    let out = Task::new_cmd("podman inspect", run_in_host_mountns("podman"))
+    use crate::cmdutils::CommandRunExt;
+    let o: Vec<Inspect> = crate::install::run_in_host_mountns("podman")
         .args(["inspect", imgid])
-        .quiet()
-        .read()?;
-    let o: Vec<Inspect> = serde_json::from_str(&out)?;
+        .run_and_parse_json()?;
     let i = o
         .into_iter()
         .next()