Add support for minimal ISO packing/unpacking

.cci.jenkinsfile

@@ -22,7 +22,8 @@ cosaPod(buildroot: true, runAsUser: 0) {
     stage("Build metal+live") {
         shwrap("cd /srv/fcos && cosa buildextend-metal")
         shwrap("cd /srv/fcos && cosa buildextend-metal4k")
-        shwrap("cd /srv/fcos && cosa buildextend-live --fast")
+        // Enable --miniso until it's the default
+        shwrap("cd /srv/fcos && cosa buildextend-live --fast --miniso")
         // Test metal with an uncompressed image and metal4k with a
         // compressed one
         shwrap("cd /srv/fcos && cosa compress --fast --artifact=metal4k")
@@ -31,7 +32,7 @@ cosaPod(buildroot: true, runAsUser: 0) {
         // No need to run the iso-live-login/iso-as-disk scenarios
         fcosKolaTestIso(
             cosaDir: "/srv/fcos",
-            scenarios: "pxe-install,pxe-offline-install,iso-install,iso-offline-install",
+            scenarios: "pxe-install,pxe-offline-install,iso-install,iso-offline-install,miniso-install",
             scenarios4k: "iso-install,iso-offline-install",
             skipUEFI: true
         )

src/cmdline.rs

@@ -100,6 +100,13 @@ pub enum IsoKargsCmd {
 pub enum IsoExtractCmd {
     /// Extract PXE files from an ISO image
     Pxe(IsoExtractPxeConfig),
+    /// Extract a minimal ISO from a CoreOS live ISO image
+    MinimalIso(IsoExtractMinimalIsoConfig),
+    // This doesn't really make sense under `extract`, but it's hidden and conceptually feels
+    // cleaner being alongside `coreos-installer iso extract minimal-iso`.
+    /// Pack a minimal ISO into a CoreOS live ISO image
+    #[structopt(setting(AppSettings::Hidden))]
+    PackMinimalIso(IsoExtractPackMinimalIsoConfig),
 }
 
 #[derive(Debug, StructOpt)]
@@ -409,6 +416,35 @@ pub struct IsoExtractPxeConfig {
     pub output_dir: String,
 }
 
+#[derive(Debug, StructOpt)]
+pub struct IsoExtractMinimalIsoConfig {
+    /// ISO image
+    #[structopt(value_name = "ISO")]
+    pub input: String,
+    /// Extract rootfs image as well
+    #[structopt(long, value_name = "PATH")]
+    pub output_rootfs: Option<String>,
+    /// Minimal ISO output file
+    #[structopt(value_name = "OUTPUT_ISO", default_value = "-")]
+    pub output: String,
+    /// Inject rootfs URL karg into minimal ISO
+    #[structopt(long, value_name = "URL")]
+    pub rootfs_url: Option<String>,
+}
+
+#[derive(Debug, StructOpt)]
+pub struct IsoExtractPackMinimalIsoConfig {
+    /// ISO image
+    #[structopt(value_name = "FULL_ISO")]
+    pub full: String,
+    /// Minimal ISO image
+    #[structopt(value_name = "MINIMAL_ISO")]
+    pub minimal: String,
+    /// Delete minimal ISO after packing
+    #[structopt(long)]
+    pub consume: bool,
+}
+
 #[derive(Debug, StructOpt)]
 pub struct OsmetPackConfig {
     /// Path to osmet file to write

src/lib.rs

@@ -19,6 +19,7 @@ pub mod install;
 pub mod io;
 pub mod iso9660;
 pub mod live;
+pub mod miniso;
 pub mod osmet;
 #[cfg(target_arch = "s390x")]
 pub mod s390x;