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--- klaren:fixnonbootingarch [2022/08/29 20:56] – klaren
+++ klaren:fixnonbootingarch [2022/08/31 20:26] (aktuell) – [Reboot] klaren
@@ Zeile 113: / Zeile 113: @@
 ==== Reboot ====
-====   ====
+==== Alles in einem Script ====
+<code>
+####################################################
+#
+# Restoring a defective GRUB
+#
+# start a temporary arch OS from stick then
+# source the file and follow the instructions
+####################################################
+# this is the partition logical name from /etc/crypttab
+LUKS_DRIVE=luks-a41aeaeae-1b9-431e-94a6-0032440889fd
+#
+# define mount options for subvol mounts
+MOUNT_OPT_ROOT=subvol=/@,defaults,noatime,compress=zstd
+MOUNT_OPT_HOME=subvol=/@home,defaults,noatime,compress=zstd
+MOUNT_OPT_CACHE=subvol=/@cache,defaults,noatime,compress=zstd
+MOUNT_OPT_LOG=subvol=/@log,defaults,noatime,compress=zstd
+#
+# Open the LUKS container - will ask for password interacively
+cryptsetup open /dev/nvme0n1p2 $LUKS_DRIVE
+#
+# Mount subvolumes into a temporary path
+mount -o $MOUNT_OPT_ROOT  /dev/mapper/$LUKS_DRIVE /mnt
+mount -o $MOUNT_OPT_HOME  /dev/mapper/$LUKS_DRIVE /mnt/home
+mount -o $MOUNT_OPT_CACHE /dev/mapper/$LUKS_DRIVE /mnt/var/cache
+mount -o $MOUNT_OPT_LOG   /dev/mapper/$LUKS_DRIVE /mnt/var/log
+#
+# Add bind mounts for important system file systems:
+for x in dev dev/pts sys sys/firmware proc ; do mount -o bind /$x /mnt/$x ; done
+#
+# Give some hint text what to do inside the chroot environment, once there
+#
+echo "mount /dev/nvme0n1p1 /boot/efi">/mnt/bind_mount_efi.sh
+echo "mount -t efivarfs efivarfs /sys/firmware/efi/efivars">>/mnt/bind_mount_efi.sh
+echo "grub-install -v"> /mnt/fix_grub.sh
+echo "grub-mkconfig -o /boot/grub/grub.cfg">>/mnt/fix_grub.sh
+echo "umount /boot/efi"> /mnt/leave_chroot.sh
+echo "umount /sys/firmware/efi/efivars">> /mnt/leave_chroot.sh
+echo "exit">> /mnt/leave_chroot.sh
+#
+# This starts bash inside of the new root under /mnt:
+#
+chroot /mnt /usr/bin/bash
+#
+# inside of the bash execute above commands to fix GRUB or rescue data or do something else
+#
+# after leaving, cleanups:
+for x in /proc /sys/firmware /sys /dev/pts /dev /var/log /var/cache /home / ; do umount /mnt$x ; done
+cryptsetup close $LUKS_DRIVE
+</code>