Implement minimal OS and Bootloader installation logic

iridium_installer/backend/disk.py

@@ -74,3 +74,28 @@ def auto_partition_disk(disk_device):
         "swap": swap_part,
         "root": root_part
     }
+
+def mount_partitions(partition_info, mount_root="/mnt"):
+    """
+    Mounts the partitions into mount_root.
+    partition_info is the dict returned by auto_partition_disk.
+    """
+    import os
+    
+    # 1. Mount Root
+    if not os.path.exists(mount_root):
+        os.makedirs(mount_root)
+    
+    run_command(["mount", partition_info["root"], mount_root])
+    
+    # 2. Mount EFI
+    efi_mount = os.path.join(mount_root, "boot/efi")
+    if not os.path.exists(efi_mount):
+        os.makedirs(efi_mount, exist_ok=True)
+    
+    run_command(["mount", partition_info["efi"], efi_mount])
+    
+    # 3. Enable Swap (optional, but might as well)
+    run_command(["swapon", partition_info["swap"]])
+    
+    logger.info(f"Partitions mounted at {mount_root}")

iridium_installer/backend/os_install.py

@@ -0,0 +1,97 @@
+import subprocess
+import logging
+import os
+
+logger = logging.getLogger(__name__)
+
+def run_command(cmd, check=True):
+    logger.info(f"Running command: {' '.join(cmd)}")
+    try:
+        result = subprocess.run(cmd, check=check, capture_output=True, text=True)
+        return result
+    except subprocess.CalledProcessError as e:
+        logger.error(f"Command failed: {e.stderr}")
+        raise
+
+def install_minimal_os(mount_root, releasever="41"):
+    """
+    Installs minimal Fedora packages to mount_root.
+    """
+    logger.info(f"Installing minimal Fedora {releasever} to {mount_root}...")
+    
+    packages = [
+        "basesystem",
+        "bash",
+        "coreutils",
+        "kernel",
+        "systemd",
+        "dnf",
+        "grub2-efi-x64",
+        "shim-x64",
+        "efibootmgr",
+        "passwd",
+        "rootfiles",
+        "vim-minimal"
+    ]
+    
+    # Fedora 41 (or whatever is current)
+    # We use --releasever to ensure dnf knows which version to fetch
+    cmd = [
+        "dnf", "install", "-y",
+        f"--installroot={mount_root}",
+        f"--releasever={releasever}",
+        "--setopt=install_weak_deps=False",
+        "--nodocs"
+    ] + packages
+    
+    run_command(cmd)
+    logger.info("Base system installation complete.")
+
+def configure_system(mount_root, partition_info):
+    """
+    Basic configuration: fstab and grub.
+    """
+    logger.info("Configuring system...")
+    
+    # 1. Generate fstab
+    # We can get UUIDs using blkid
+    def get_uuid(dev):
+        res = run_command(["blkid", "-s", "UUID", "-o", "value", dev])
+        return res.stdout.strip()
+
+    root_uuid = get_uuid(partition_info["root"])
+    efi_uuid = get_uuid(partition_info["efi"])
+    swap_uuid = get_uuid(partition_info["swap"])
+
+    fstab_content = f"""
+UUID={root_uuid} / ext4 defaults 1 1
+UUID={efi_uuid} /boot/efi vfat defaults 0 2
+UUID={swap_uuid} none swap defaults 0 0
+"""
+    with open(os.path.join(mount_root, "etc/fstab"), "w") as f:
+        f.write(fstab_content)
+    
+    # 2. Configure GRUB
+    # This is tricky because we need to chroot or use --boot-directory
+    # Simplest for "barely bootable shell" is to try running grub2-mkconfig inside chroot
+    
+    # Need to bind mount dev, proc, sys for chroot
+    for dev in ["dev", "proc", "sys"]:
+        target = os.path.join(mount_root, dev)
+        run_command(["mount", "--bind", f"/{dev}", target])
+    
+    try:
+        # grub2-mkconfig -o /boot/grub2/grub.cfg (or wherever Fedora puts it)
+        # On UEFI Fedora: /boot/efi/EFI/fedora/grub.cfg usually just redirects to /boot/grub2/grub.cfg
+        # Let's just do both or standard one.
+        chroot_cmd = ["chroot", mount_root, "grub2-mkconfig", "-o", "/boot/grub2/grub.cfg"]
+        run_command(chroot_cmd)
+        
+        # Also need to make sure EFI boot entry is there, but shim/grub2 packages usually handle it in %post?
+        # Maybe not in --installroot.
+    finally:
+        # Unmount binds
+        for dev in ["sys", "proc", "dev"]:
+            run_command(["umount", os.path.join(mount_root, dev)])
+
+    logger.info("System configuration complete.")

iridium_installer/main.py

@@ -16,20 +16,46 @@ def main():
         "--partition-disk",
         help="Automatically partition the specified disk (WARNING: DESTROYS DATA)",
     )
+    parser.add_argument(
+        "--full-install",
+        help="Run a full minimal installation on the specified disk (WARNING: DESTROYS DATA)",
+    )
     args = parser.parse_args()
 
-    if args.partition_disk:
-        from .backend.disk import auto_partition_disk
+    if args.partition_disk or args.full_install:
+        from .backend.disk import auto_partition_disk, mount_partitions
+        from .backend.os_install import install_minimal_os, configure_system
+        
+        target = args.partition_disk or args.full_install
         try:
-            print(f"Starting partitioning on {args.partition_disk}...")
-            result = auto_partition_disk(args.partition_disk)
-            print("Partitioning successful!")
-            print(f"EFI: {result['efi']}")
-            print(f"Swap: {result['swap']}")
-            print(f"Root: {result['root']}")
+            print(f"Starting installation on {target}...")
+            
+            print("Step 1: Partitioning...")
+            parts = auto_partition_disk(target)
+            
+            if args.full_install:
+                print("Step 2: Mounting...")
+                mount_root = "/mnt"
+                mount_partitions(parts, mount_root)
+                
+                print("Step 3: Installing OS (this may take a while)...")
+                install_minimal_os(mount_root)
+                
+                print("Step 4: Configuring Bootloader...")
+                configure_system(mount_root, parts)
+                
+                print("Installation complete! You can now reboot.")
+            else:
+                print("Partitioning successful!")
+                print(f"EFI: {parts['efi']}")
+                print(f"Swap: {parts['swap']}")
+                print(f"Root: {parts['root']}")
+            
             return 0
         except Exception as e:
-            print(f"Partitioning failed: {e}", file=sys.stderr)
+            print(f"Installation failed: {e}", file=sys.stderr)
+            import traceback
+            traceback.print_exc()
             return 1
 
     import gi