From 0d56e70688c4d04009d471b23c33a28269a728da Mon Sep 17 00:00:00 2001
From: BodgeMaster <>
Date: Wed, 21 Jun 2023 07:07:13 +0200
Subject: [PATCH] add kernel hooks

---
 install-stage1.sh                 | 11 +++++-
 kernel.d/post-install/99-void-usb | 59 +++++++++++++++++++++++++++++++
 kernel.d/post-remove/99-void-usb  | 10 ++++++
 kernel.d/pre-install/99-void-usb  | 24 +++++++++++++
 4 files changed, 103 insertions(+), 1 deletion(-)
 create mode 100644 kernel.d/post-install/99-void-usb
 create mode 100644 kernel.d/post-remove/99-void-usb
 create mode 100644 kernel.d/pre-install/99-void-usb

diff --git a/install-stage1.sh b/install-stage1.sh
index bdbf1d2..e832fcd 100644
--- a/install-stage1.sh
+++ b/install-stage1.sh
@@ -283,7 +283,16 @@ chmod 755 /mnt/target/opt/void-usb
 wget --output-document=/mnt/target/opt/void-usb/grub-config https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/opt/grub-config
 chmod 744 /mnt/target/opt/void-usb/grub-config
 
-run_in_target /opt/void-usb/grub-config
+#TODO: ensure that this is being run by xbps-reconfigure -fa, if not add it here
+# run_in_target /opt/void-usb/grub-config
 
+wget --output-document=/mnt/target/etc/kernel.d/pre-install/99-void-usb https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/kernel.d/pre-install/99-void-usb
+chmod 744 /mnt/target/kernel.d/pre-install/99-void-usb
+wget --output-document=/mnt/target/etc/kernel.d/post-install/99-void-usb https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/kernel.d/post-install/99-void-usb
+chmod 744 /mnt/target/kernel.d/post-install/99-void-usb
+wget --output-document=/mnt/target/etc/kernel.d/post-remove/99-void-usb https://lostcave.ddnss.de/git/BodgeMaster/void-minecraft-usb/raw/branch/master/kernel.d/post-remove/99-void-usb
+chmod 744 /mnt/target/kernel.d/post-remove/99-void-usb
+
+run_in_target xbps-reconfigure -fa
 
 #
diff --git a/kernel.d/post-install/99-void-usb b/kernel.d/post-install/99-void-usb
new file mode 100644
index 0000000..9d14895
--- /dev/null
+++ b/kernel.d/post-install/99-void-usb
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+#
+# Kernel post-install hook for Void-USB
+# This script generates the symlinks for default /boot/{vmlinuz,initramfs}.
+# It also re-generates the GRUB config.
+#
+# Arguments: $1 package name, $2 kernel version
+
+PKGNAME="$1"
+VERSION="$2"
+
+echo "Updating default kernel and initramfs symlinks..."
+
+#####################
+# Delete old symlinks
+#####################
+OLD_LINUX=/boot/vmlinu?
+if [ ! -f "$OLD_LINUX" ]; then
+  # in cases where it’s a .gz or .xz or whatever
+  OLD_LINUX=$(find /boot -type l -name "vmlinu*" 2>/dev/null | sort | head -n1)
+fi
+[ -f "$OLD_LINUX" ] && rm "$OLD_LINUX"
+
+OLD_INITRAMFS=/boot/initramfs.img
+if [ ! -f "$OLD_INITRAMFS" ]; then
+  # hope to find anything named initramfs or initrd
+  OLD_INITRAMFS=$(find /boot -type l -name "init*" 2>/dev/null | sort | head -n1)
+fi
+[ -f "$OLD_INITRAMFS" ] && rm "$OLD_INITRAMFS"
+
+#####################
+# Create new symlinks
+#####################
+NEW_LINUX_FILE="$(find /boot -name "*$VERSION*" 2>/dev/null | sed 's|^/boot/||' | grep -e '^vmlinu' -e '^linux' -e '^linuz' -e '^kernel')"
+NEW_LINUX_SYMLINK="vmlinuz"
+if grep -e '^vmlinux' -e '^linux' -e '^kernel' >/dev/null 2>&1 <<< "$NEW_LINUX_FILE"; then
+  NEW_LINUX_SYMLINK="vmlinux"
+fi
+if grep -e ".gz$" -e ".xz$" -e ".bz$" -e ".bz2$" -e ".lzma$" -e ".lz$" -e ".img$" >/dev/null 2>&1 <<< "$NEW_LINUX_FILE"; then
+  NEW_LINUX_SYMLINK="$NEW_LINUX_SYMLINK$(grep -o -e ".gz$" -e ".xz$" -e ".bz$" -e ".bz2$" -e ".lzma$" -e ".lz$" -e ".img$" 2>/dev/null <<< "$NEW_LINUX_FILE")"
+fi
+ln -s "$NEW_LINUX_FILE" "/boot/$NEW_LINUX_SYMLINK"
+
+NEW_INITRAMFS_FILE="$(find /boot -name "init*$VERSION*" 2>/dev/null | sed 's|^/boot/||')"
+NEW_INITRAMFS_SYMLINK="initramfs"
+if grep '^initrd' >/dev/null 2>&1 <<< "$NEW_INITRAMFS_FILE"; then
+  NEW_INITRAMFS_SYMLINK="initrd"
+fi
+if grep -e ".gz$" -e ".xz$" -e ".bz$" -e ".bz2$" -e ".lzma$" -e ".lz$" -e ".img$" >/dev/null 2>&1 <<< "$NEW_INITRAMFS_FILE"; then
+  NEW_INITRAMFS_SYMLINK="$NEW_INITRAMFS_SYMLINK$(grep -o -e ".gz$" -e ".xz$" -e ".bz$" -e ".bz2$" -e ".lzma$" -e ".lz$" -e ".img$" 2>/dev/null <<< "$NEW_INITRAMFS_FILE")"
+fi
+ln -s "$NEW_INITRAMFS_FILE" "/boot/$NEW_INITRAMFS_SYMLINK"
+
+echo "Default kernel and initramfs are now: $NEW_LINUX_FILE, $NEW_INITRAMFS_FILE"
+
+####################
+# Update GRUB config
+####################
+/opt/void-usb/grub-config
diff --git a/kernel.d/post-remove/99-void-usb b/kernel.d/post-remove/99-void-usb
new file mode 100644
index 0000000..a8fea0a
--- /dev/null
+++ b/kernel.d/post-remove/99-void-usb
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+#
+# Kernel post-remove hook for Void-USB
+# This script regenerates the GRUB config.
+#
+# Arguments: $1 package name, $2 kernel version
+PKGNAME="$1"
+VERSION="$2"
+
+/opt/void-usb/grub-config
diff --git a/kernel.d/pre-install/99-void-usb b/kernel.d/pre-install/99-void-usb
new file mode 100644
index 0000000..e3481e0
--- /dev/null
+++ b/kernel.d/pre-install/99-void-usb
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+#
+# Kernel pre-install hook for Void-USB
+# This script removes old kernels when disk space is low.
+#
+# Arguments: $1 package name, $2 kernel version
+PKGNAME="$1"
+VERSION="$2"
+
+MB_LOW=250
+MB_FREE="$(df --block-size=1M --output=avail /boot | tail -n1)"
+
+if [ "$MB_FREE" -lt "$MB_LOW" ]; then
+  echo
+  OLDEST_KERNEL="$(vkpurge list | sort | head -n1)"
+  if [ -z "$OLDEST_KERNEL" ]; then
+    echo -e "\033[31m================================================\n\033[33mWARNING:\033[0m Failed to find an old kernel to remove.\nThe /boot partition is running out of space.\nThis will become an issue if left unaddressed.\n\033[31m================================================\033[0m"
+  else
+    echo "Removing old kernel $OLDEST_KERNEL using vkpurge..."
+    vkpurge rm "$OLDEST_KERNEL"
+  fi
+else
+  echo "Not doing anything, /boot has plenty of space."
+fi