Adding a warning when /boot is reasonably too small (#738)

* Moved convert_size_to_gb() into disk/helpers.py, Added a Partition().size property meta function. Using the .size value to check if /boot is too small which will raise an exception. The only drawback is that it's done post-formatting. This in order to catch scenarios where formatting isn't used.
* Changed /boot warning from 0.15GB to 0.25GB
* Changed the wording in the warning when /boot is too small.

1 files changed, 6 insertions, 0 deletions

diff --git a/examples/guided.py b/examples/guided.py
index e48ad89d..1ee31d38 100644
--- a/examples/guided.py
+++ b/examples/guided.py
@@ -264,6 +264,12 @@ def perform_installation(mountpoint):
 		# This *can* be done outside of the installation, but the installer can deal with it.
 		installation.mount_ordered_layout(archinstall.storage['disk_layouts'])
 
+		# Placing /boot check during installation because this will catch both re-use and wipe scenarios.
+		for partition in installation.partitions:
+			if partition.mountpoint == installation.target + '/boot':
+				if partition.size <= 0.25: # in GB
+					raise archinstall.DiskError(f"The selected /boot partition in use is not large enough to properly install a boot loader. Please resize it to at least 256MB and re-run the installation.")
+
 		# if len(mirrors):
 		# Certain services might be running that affects the system during installation.
 		# Currently, only one such service is "reflector.service" which updates /etc/pacman.d/mirrorlist