tom: resize the disk containing nix storage after an unmounting

youch this was a painful mistake. do not unmount the /nix/store or core
commands are lost!!

i was hoping to increase the disk size for the /nix/store so mounted
a disk, copied the store, updated the configuration.nix, and rebuilt.

after unmounting this disk things went bad. no sudo to edit configs.

rebooting failed for that generation so with the layout of disks and
uuids being different, reinstalling was found to be the quickest fix.

no data was lost and new commands were learned.

Author: zimeg

CHANGELOG.md

@@ -6,6 +6,7 @@ versioning is done in a continuous fashion without worries of breaking changes.
 
 ## patches
 
+- `tom`: resize the disk containing nix storage after an unmounting 2024-09-15
 - `nvim`: jump to the starting point of tofu project configurations 2024-09-13
 - `ssh`: attach to tmux sessions for started communication with tom 2024-09-13
 - `nvim`: replace the deprecated tsserver lspconfig setup for ts_ls 2024-09-13

machines/tom/configuration.nix

@@ -47,6 +47,7 @@ in
   };
   environment.systemPackages = with pkgs; [
     addOpenGLRunpath
+    parted
     cudaPackages.cuda_cudart
     cudaPackages.cudatoolkit
     linuxPackages.nvidia_x11

machines/tom/hardware/configuration/README.md

@@ -0,0 +1,67 @@
+# configuration
+
+hardware is difficult without doubt. and that is just in the configurations of
+hardware.
+
+it takes tries and tries and tries to guess the right disk descriptor.
+
+## filesystems
+
+files of photos in folders and so much more.
+
+reference: https://nixos.org/manual/nixos/stable/options.html#opt-fileSystems
+
+### chores
+
+#### resising disks
+
+resizing disks is an occasional chore which requires cautious change to unique
+identifiers and careful partitions.
+
+backups are optional if the home directories remains intact.
+
+in abundance of ignorance i recommend reinstalling nixos altogether to configure
+disks during setup. enter bios with `F11` and be patient during downloads.
+
+once reinstallation completes the `configuration.nix` can be replaced with new
+values found in a generated `hardware-configuration.nix`.
+
+### commands
+
+inspecting the realms in which files exist is a somewhat infrequent but nuanced
+task that deserves good luck and these commands with `sudo` privilege:
+
+```sh
+$ blkid         # block device attributes
+$ chown         # change file owner and group
+$ chroot        # run shell with special root
+$ df            # report file system space usage
+$ journalctl    # print logged journaled entries
+$ lsblk         # list block devices
+$ lvdisplay     # logical volume information
+$ mount         # mount a filesystem
+$ nano          # another text editor
+$ parted        # partition manipulation
+$ pvdisplay     # physical volume information
+$ resize2fs     # file system resizer
+$ rsync         # a fast file copying tool
+$ su            # gain super user powers
+$ swapoff       # stop paging and swapping
+$ swapon        # start pages and swapping
+$ umount        # unmount filesystems
+$ vgdisplay     # volume group information
+```
+
+### directories
+
+meaningful paths to inspect when dealing with disks includes both existing and
+uncreated directories:
+
+```sh
+/dev/*          # device files
+/dev/mapper/*   # logical volumes
+/mnt/*          # mounted paths
+/proc/*         # process info
+/run/*          # service programs
+/sys/*          # kernel libraries
+```

machines/tom/hardware/configuration/default.nix

@@ -14,14 +14,18 @@
   };
   fileSystems = {
     "/" = {
-      device = "/dev/disk/by-uuid/30535ff2-b087-45ac-a9cd-cc198dbe7f81";
+      device = "/dev/disk/by-uuid/925e1fcc-2949-4446-8ee9-74ca13363858";
       fsType = "ext4";
     };
     "/boot" = {
       device = "/dev/disk/by-uuid/205C-364C";
       fsType = "vfat";
       options = [ "fmask=0022" "dmask=0022" ];
     };
+    "/home" = {
+      device = "/dev/disk/by-uuid/30535ff2-b087-45ac-a9cd-cc198dbe7f81";
+      fsType = "ext4";
+    };
   };
   hardware = {
     cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;