[PR PATCH] [RFC] base-files: add kernel hook for /boot freespace

[abenson <abenson@users.noreply.github.com>]

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There is a new pull request by abenson against master on the void-packages repository

https://github.com/abenson/void-packages kernel_bootsize_hook
https://github.com/void-linux/void-packages/pull/44137

[RFC] base-files: add kernel hook for /boot freespace
    <leah2> we should make a kernel install hook check that prints a big
            warning if /boot is full after running it...

Thoughts:

1. Change the threshold size? Make it configurable?
2. Change the threshold to a percentage? I think that's less useful.
3. Change what package this is shipped with? I'm not sure if it applies to all configurations we support/consider.
4. Wording of the message?

A patch file from https://github.com/void-linux/void-packages/pull/44137.patch is attached

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From df0e3d48974aa64a44199f7492c95686c083d62b Mon Sep 17 00:00:00 2001
From: Andrew Benson <abenson+void@gmail.com>
Date: Mon, 29 May 2023 10:38:49 -0500
Subject: [PATCH] base-files: add kernel hook for /boot freespace

---
 srcpkgs/base-files/files/50-bootsize.postinst | 22 +++++++++++++++++++
 srcpkgs/base-files/template                   |  4 +++-
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 srcpkgs/base-files/files/50-bootsize.postinst

diff --git a/srcpkgs/base-files/files/50-bootsize.postinst b/srcpkgs/base-files/files/50-bootsize.postinst
new file mode 100644
index 000000000000..ada23bc3ee00
--- /dev/null
+++ b/srcpkgs/base-files/files/50-bootsize.postinst
@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+# Kernel hook to check for filled /boot partitions
+#
+# Arguments passed to this script: $1 pkgname, $2 version.
+#
+PKGNAME="$1"
+VERSION="$2"
+
+# freespace = blocksize * freeblocks
+freespace=$(( $(stat -f -c %S /boot) * $(stat -f -c %f /boot) ))
+
+# freespace for /boot is <= 100MB
+if [ $freespace -le 104857600 ]; then
+cat <<ENDMSG
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * WARNING: /boot has less than 100MB available. Use 'vkpurge' to ensure *
+ * there will be enough space for future kernels. Your system may become *
+ * unbootable otherwise.                                                 *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ENDMSG
+fi
diff --git a/srcpkgs/base-files/template b/srcpkgs/base-files/template
index 27b83604b648..24c73001770e 100644
--- a/srcpkgs/base-files/template
+++ b/srcpkgs/base-files/template
@@ -1,7 +1,7 @@
 # Template file for 'base-files'
 pkgname=base-files
 version=0.143
-revision=1
+revision=2
 bootstrap=yes
 depends="xbps-triggers"
 short_desc="Void Linux base system files"
@@ -85,6 +85,8 @@ do_install() {
 	vbin ${FILESDIR}/vkpurge
 	vman ${FILESDIR}/vkpurge.8
 
+	vinstall ${FILESDIR}/50-bootsize.postinst 0755 etc/kernel.d/post-install 50-bootsize
+
 	vbin ${FILESDIR}/lsb_release
 
 	# Install default dracut configuration.