ns-install: halt on completion (#331)

* halt instead of reboot after installation
* use lsblk to list available disks
* skip 0 sized disk (empty sd card readers)
* copy only the size of source img

files/usr/sbin/ns-install

@@ -1,37 +1,13 @@
 #!/bin/bash
 #
-# Copyright (C) 2022 Nethesis S.r.l.
+# Copyright (C) 2022-2024 Nethesis S.r.l.
 # SPDX-License-Identifier: GPL-2.0-only
 #
 
 set -e
 
-function list_disks {
-    find /dev/ -name 'sd[a-z]' -o -name 'nvme[0-9]' -o -name 'hd[a-z]' -o -name 'vd[a-z]' -o -name 'xvd[a-z]' -o -name 'mmcblk[0-9]' | sort | uniq
-}
-
-function color_green {
-    echo -ne '\e[32m'$1'\e[0m'
-}
-function color_white {
-    echo -ne '\e[97m'$1'\e[0m'
-}
-function wrong_command {
-    echo -e '\e[31m'"Wrong option."'\e[0m';
-}
-
-function install() {
-    # Find boot device and umount it
-    part=$(mount | grep boot | uniq | awk '{print $1}')
-    device=${part::-1}
-    umount /boot
-    umount /boot
-    umount /overlay
-    umount /rom
-    sleep 1
-    echo "Writing image ... "
-    dd if=$device of=$1 bs=1M iflag=fullblock conv=fsync 2>/dev/null
-}
+white=$'\033[0;97m'
+green=$'\033[0;32m'
 
 function print_help {
     echo "Usage: $0 [-t <device>] -f"
@@ -41,10 +17,10 @@ function print_help {
 }
 
 function check {
-    disk=$1
-    if [ $(grep "${disk##*/}" /proc/partitions | wc -l) -gt 1 ]; then
-        echo -e "Multiple partitions found on $(color_white $disk), all content on device will be deleted!"
-        read -rp "$(color_white 'Do you want to proceed? (y/N) ')" force
+    disk=$(basename $1)
+    if [ $(grep -c $disk /proc/partitions) -gt 1 ]; then
+        echo -e "Multiple partitions found on $1, all content on device will be deleted!"
+        read -rp "Do you want to proceed? (y/N) " force
         case $force in
             [yY] ) return 0;;
             * ) echo "Aborted"; return 1;;
@@ -53,17 +29,25 @@ function check {
     return 0
 }
 
-function bytes_to_h() {
-    echo $1 | awk 'function human(x) {
-         x=x*512
-        s=" B   KiB MiB GiB TiB EiB PiB YiB ZiB"
-         while (x>=1024 && length(s)>1)
-               {x/=1024; s=substr(s,5)}
-         s=substr(s,1,4)
-         xf=(s==" B  ")?"%3d":"%8.2f"
-         return sprintf( xf"%s\n", x, s)
-      }
-      {gsub(/^[0-9]+/, human($1)); print}'
+function install() {
+    # Find boot device and umount it
+    part=$(mount | grep boot | uniq | awk '{print $1}')
+    device=${part::-1}
+    if [ $device == $1 ]; then echo "Error: can't install on source disk" >&2 ; exit 1; fi
+    umount /boot
+    umount /boot
+    umount /overlay
+    umount /rom
+
+    sleep 1
+    count=$(parted -sm $device print 2>/dev/null | grep "^2:" | cut -d: -f3 | sed "s/MB//")
+    echo "Writing image... "
+    dd if=$device of=$1 bs=1M count=$count
+    sync
+    echo 3 > /proc/sys/vm/drop_caches
+    sleep 1
+    echo "Installation complete. Halting... "
+    halt
 }
 
 
@@ -79,51 +63,32 @@ done
 
 # select existing disks
 if [ -z "$target" ]; then
-    echo "Select target disk:"
+    echo "Select target disk (or press Enter to exit):"
     counter=1
-    for disk in $(list_disks); do
-        model=$(cat /sys/class/block/${disk:5}/device/model 2>/dev/null || echo '')
-        vendor=$(cat /sys/class/block/${disk:5}/device/vendor 2>/dev/null || echo '')
-        if [ ! -z "$model" ] && [ -z "$vendor" ]; then
-            model="($vendor: $model)"
-        fi
-        size=$(bytes_to_h $(cat /sys/class/block//${disk:5}/device/block//${disk:5}/size))
-        if grep -q $disk /proc/mounts; then
-            used='used'
-        else
-            used='free'
-        fi
-        echo -n "$(color_green "${counter})" ) $(color_white ${disk:5})   $size   $used   $model"
-        counter=$((counter+1))
-        echo
-    done;
-    read -rp "$(color_white 'Your choice: ')" choice
-    if [ ${choice:-1} -gt 0 ] && [ ${choice} -lt ${counter} ]; then
-        target=$(list_disks | awk 'NR=='$choice'{ print; }')
+    disks="$(lsblk -nlo NAME,SIZE,TYPE,MODEL | awk '$3 ~ /^disk/ && $1 !~ /ram/ && $2 !~ /^0B$/')"
+    while read -r disk size type model; do
+	used=$(grep -q $disk /proc/mounts && echo "used" || echo "free")
+	echo -e "${green}${counter}) ${white}${disk}	$size	$used	$model"
+	counter=$((counter+1))
+    done <<< "$disks"
+
+    read -rp "Your choice: " choice
+    if [ ${choice:-0} -gt 0 ] && [ ${choice} -lt ${counter} ]; then
+	target=$(echo "$disks" | awk 'NR=='$choice'{ print $1; }')
+        target="/dev/${target}"
     else
        echo "Aborted: invalid choice"
        exit 1
     fi
 fi
 
-if [ -b $target ]; then
+if [ -b "${target}" ]; then
     if [ "$force" -eq 1 ]; then
         install $target
     else
         check $target && install $target
-        if [ $? -eq 0 ]; then
-            echo -e "Installation completed"
-            cp /sbin/reboot /tmp
-            sync
-            sleep 1
-            reset
-            read -rp "$(color_white 'Remove install medium and press enter to reboot')" reboot;
-            /tmp/reboot
-        fi
    fi
 else
     echo -e "Target device not found: '$target'"
-    error=1
+    exit 1
 fi
-
-exit ${error:-0}