From 210a70fc73ff5a1ef21da914eee320d969a95b06 Mon Sep 17 00:00:00 2001
From: Alejandro Sirgo Rica <asirgo@soleta.eu>
Date: Thu, 25 Jul 2024 16:37:06 +0200
Subject: utils: add set_linux_hostname

Add set_linux_hostname function to redefine the hostname of a
Linux install by overwriting the contents of /etc/hostname
---
 src/utils/postinstall.py | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/src/utils/postinstall.py b/src/utils/postinstall.py
index 7fef437..374a1cd 100644
--- a/src/utils/postinstall.py
+++ b/src/utils/postinstall.py
@@ -66,6 +66,25 @@ def set_windows_hostname(disk, partition, name):
         umount(mountpoint)
 
 
+def set_linux_hostname(disk, partition, name):
+    logging.info(f'Configuring hostname')
+
+    device = get_partition_device(disk, partition)
+    mountpoint = device.replace('dev', 'mnt')
+
+    if not mount_mkdir(device, mountpoint):
+        raise OgError(f'Unable to mount {device} into {mountpoint}')
+
+    try:
+        hostname_path = f'{mountpoint}/etc/hostname'
+        with open(hostname_path, 'w') as f:
+            f.write(name)
+    except OSError as e:
+        raise OgError(f'Unable to configure Linux hostname: {e}') from e
+    finally:
+        umount(mountpoint)
+
+
 def configure_os_custom(disk, partition):
     if not shutil.which('configureOsCustom'):
         raise OgError('configureOsCustom not found')
@@ -149,6 +168,9 @@ def install_grub(disk, partition):
 
 
 def configure_os_linux(disk, partition):
+    hostname = gethostname()
+    set_linux_hostname(disk, partition, hostname)
+
     configure_fstab(disk, partition)
 
     if is_uefi_supported():
-- 
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