feat(os): Always do 5 parallel pacman downloads (#1)

README.md

@@ -79,7 +79,7 @@ The ZFS pool and dataset setup that makes this tick, explained in plain English.
 1. Neither the root dataset nor the pool are mounted at this time. We now create one boot environment dataset where we want to install Arch Linux.
     1. `-o mountpoint=/`: Our Arch Linux dataset will be mounted at `/`.
     1. `-o canmount=noauto`: When set to `noauto`, a dataset can only be mounted and unmounted explicitly. The dataset is not mounted automatically when the dataset is created or imported, nor is it mounted by the `zfs mount -a` command or unmounted by the `zfs unmount -a` command.
-    1. We then `zpool set bootfs="zpool/root/archlinux" zpool`: ZFSBootMenu uses the `bootfs` property to identify suitable boot environments. If only one dataset has it - as is the case here - it'll be booted by default with a 10-second countdown allowing manual interaction in ZFSBootMenu.
+    1. We then `zpool set bootfs="zpool/root/archlinux" zpool`: ZFSBootMenu uses the `bootfs` property to identify suitable boot environments. If only one pool has it - as is the case here - it identifies the pool's preferred boot dataset that will be booted with a 10-second countdown allowing manual interaction in ZFSBootMenu.
     1. We explicitly mount the boot environment. Since the entire pool is still subject to our initial `-R /mnt` during creation a `zfs mount zpool/root/archlinux` will mount the Arch Linux dataset not into `/` but instead into `/mnt`.
 1. We also create a `data` dataset that - at least for now - we use to store only our `/home` data.
     1. For `zpool/data`:

setup.sh

@@ -7,6 +7,10 @@ declare zpool_name zfs_arch_dataset_name
 zpool_name='zpool'
 zfs_arch_dataset_name='archlinux'
 
+# https://unix.stackexchange.com/a/48550
+set -E
+trap '[ "$?" -ne 77 ] || exit 77' ERR
+
 function set_ntp () {
     timedatectl set-ntp true
 }
@@ -56,8 +60,8 @@ function get_parts () {
             parts="$(get_partitions | jq --raw-output '.[][] | select(.parttype=="c12a7328-f81f-11d2-ba4b-00a0c93ec93b") | .path')" || exit 1
             ;;
         *)
-            printf -- '%s\n' 'Unknown partition type '"'"'"${parttype}"'"'"', exiting 1 ...'
-            exit 1
+            >2 printf -- '%s\n' 'Unknown partition type '"'"'"${parttype}"'"'"', exiting 1 ...'
+            exit 77
             ;;
     esac
     printf -- '%s' "${parts}"
@@ -72,8 +76,8 @@ function we_have_exactly_one_part () {
     if [[ "$(wc -c <<<"${parts_list}")" -gt '1' ]]; then
         case "${parts_count}" in
             0)
-                printf -- '%s\n' 'No '"${parttype^^}"' partition found. Exiting 1 ...'
-                exit 1
+                >2 printf -- '%s\n' 'No '"${parttype^^}"' partition found. Exiting 1 ...'
+                exit 77
                 ;;
             1)
                 return 0
@@ -82,20 +86,21 @@ function we_have_exactly_one_part () {
                 return 1
                 ;;
         esac
-        printf -- '%s\n' 'Partition list does not look valid. Cowardly exiting 1 ...'
-        exit 1
+        >2 printf -- '%s\n' 'Partition list does not look valid. Cowardly exiting 1 ...'
+        exit 77
     fi
 }
 
 function get_drive_id () {
-    declare drive_id
-    drive_id="$(find -L /dev/disk/by-id -samefile "${1:?}")"
-    if [[ "$(wc -l <<<"${drive_id}")" -eq '1' ]] && [[ "$(wc -c <<<"${drive_id}")" -gt '1' ]]; then
-        printf -- '%s' "${drive_id}"
+    local drive_id_list drive_id_single
+    drive_id_list="$(find -L /dev/disk/by-id -samefile "${1:?}" | sort)"
+    drive_id_single="$(head -n1 <<<"${drive_id_list}")"
+    if [[ "$(wc -l <<<"${drive_id_single}")" -eq '1' ]] && [[ "$(wc -c <<<"${drive_id_single}")" -gt '1' ]]; then
+        printf -- '%s' "${drive_id_single}"
         return 0
     fi
-    printf -- '%s\n' 'Not exactly one '"'${1:?}'"' partition entry in /dev/disk/by-id, exiting 1 ...'
-    exit 1
+    >2 printf -- '%s\n' 'Not exactly one '"'${1:?}'"' partition entry in /dev/disk/by-id, exiting 1 ...'
+    exit 77
 }
 
 function select_part () {
@@ -220,8 +225,12 @@ function copy_zpool_cache () {
     zpool set 'cachefile=/etc/zfs/'"${zpool_name}"'.cache' "${zpool_name}"
 }
 
-function install_archlinux () {
+function pacman_dl_parallel () {
     sed -ri -e 's'$'\x1''^.*?(ParallelDownloads)[^\r\n\f]*'$'\x1''\1 = 5'$'\x1''g' '/etc/pacman.conf'
+}
+
+function install_archlinux () {
+    pacman_dl_parallel
     pacstrap /mnt              \
         base                   \
         base-devel             \
@@ -426,6 +435,21 @@ EOF
     systemctl enable "${path_unit}"
 }
 
+function add_motd_getting_started_msg () {
+    cat > '/etc/motd' <<"EOF"
+
+####################
+
+GUI basics:
+
+    paru -S xorg plasma-meta kde-applications-meta sddm
+    localectl set-x11-keymap de
+
+####################
+
+EOF
+}
+
 function install_os_in_chroot () {
     ### Reinit keyring
     # As keyring is initialized at boot, and copied to the install dir with pacstrap, and ntp is running
@@ -437,6 +461,9 @@ function install_os_in_chroot () {
     pacman -S archlinux-keyring --noconfirm
 
     keep_initiramfs_root_only_rw
+    pacman_dl_parallel
+    unleash_makepkg
+    add_motd_getting_started_msg
     get_aur_helper
     paru_install 'zfs-dkms' 'zfs-utils'
     hwclock --systohc
@@ -576,6 +603,7 @@ function main () {
         set_ntp
         update_pacman_db
         install_pkgs 'jq'
+        unleash_makepkg
         install_zfs
         setup_zpool
         mount_system