cfsctl: Create lib target

Create a lib target for cfsctl and export some useful functions so we
can use this as a proxy from bootc

Add `run_from_iter` function that accepts the same args as `cfsctl` and
runs the cli logic programmatically

Ref: bootc-dev/bootc#2017

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

Author: Johan-Liebert1

Cargo.toml

@@ -17,6 +17,7 @@ unsafe_code = "deny" # https://github.com/containers/composefs-rs/issues/123
 
 [workspace.dependencies]
 composefs = { version = "0.3.0", path = "crates/composefs", default-features = false }
+cfsctl = { version = "0.3.0", path = "crates/cfsctl", default-features = false }
 composefs-ioctls = { version = "0.3.0", path = "crates/composefs-ioctls", default-features = false }
 composefs-oci = { version = "0.3.0", path = "crates/composefs-oci", default-features = false }
 composefs-boot = { version = "0.3.0", path = "crates/composefs-boot", default-features = false }

crates/cfsctl/Cargo.toml

@@ -10,6 +10,9 @@ repository.workspace = true
 rust-version.workspace = true
 version.workspace = true
 
+[lib]
+path = "src/lib.rs"
+
 [features]
 default = ['pre-6.15', 'oci']
 http = ['composefs-http']