composefs/export: Update image digest query format

After bootc/commit/49d753f996747a9b1f531abf35ba4e207cf4f020,
composefs-rs saves config in the format `oci-config-sha256:`.

Update to match the same

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

crates/lib/src/bootc_composefs/export.rs

@@ -50,7 +50,8 @@ pub async fn export_repo_to_image(
 
     let imginfo = get_imginfo(storage, &depl_verity, None).await?;
 
-    let config_digest = imginfo.manifest.config().digest().digest();
+    // We want the digest in the form of "sha256:abc123"
+    let config_digest = format!("{}", imginfo.manifest.config().digest());
 
     let var_tmp =
         Dir::open_ambient_dir("/var/tmp", ambient_authority()).context("Opening /var/tmp")?;
@@ -60,7 +61,7 @@ pub async fn export_repo_to_image(
 
     // Use composefs_oci::open_config to get the config and layer map
     let (config, layer_map) =
-        open_config(&*booted_cfs.repo, config_digest, None).context("Opening config")?;
+        open_config(&*booted_cfs.repo, &config_digest, None).context("Opening config")?;
 
     // We can't guarantee that we'll get the same tar stream as the container image
     // So we create new config and manifest

crates/lib/src/bootc_composefs/soft_reboot.rs

@@ -16,7 +16,7 @@ use cap_std_ext::cap_std::fs::Dir;
 use cap_std_ext::dirext::CapStdExtDirExt;
 use fn_error_context::context;
 use ostree_ext::systemd_has_soft_reboot;
-use rustix::mount::{unmount, UnmountFlags};
+use rustix::mount::{UnmountFlags, unmount};
 use std::{fs::create_dir_all, os::unix::process::CommandExt, path::PathBuf, process::Command};
 
 const NEXTROOT: &str = "/run/nextroot";