hdd: add shelf-layout.sh to draw disk shelf grid from SES enclosure data

hdd/shelf-layout.sh

+#!/bin/bash
+# Draw disk shelf layout from /sys/class/enclosure/ data.
+# Maps slot numbers to block devices, sizes, models, and ZFS pool membership.
+#
+# Usage:   shelf-layout.sh [enclosure_addr]
+# Example: shelf-layout.sh 6:0:22:0
+# Env:     COLS=6 ROWS=4   shelf geometry, slot 0 top-left, left->right then row down
+
+set -u
+
+enc=${1:-$(ls /sys/class/enclosure/ 2>/dev/null | head -1)}
+[ -n "$enc" ] || { echo "shelf-layout: no enclosure under /sys/class/enclosure/" >&2; exit 1; }
+encdir=/sys/class/enclosure/$enc
+[ -d "$encdir" ] || { echo "shelf-layout: $encdir does not exist" >&2; exit 1; }
+
+cols=${COLS:-6}
+rows=${ROWS:-4}
+
+declare -A slot_dev slot_status
+for d in "$encdir"/[0-9]*; do
+    [ -d "$d" ] || continue
+    s=${d##*/}
+    slot_dev[$s]=$(ls "$d/device/block/" 2>/dev/null | head -1)
+    slot_status[$s]=$(cat "$d/status" 2>/dev/null)
+done
+
+declare -A dev_size dev_model
+while read -r name size model; do
+    dev_size[$name]=$size
+    dev_model[$name]=$model
+done < <(lsblk -d -n -o NAME,SIZE,MODEL)
+
+declare -A dev_pool
+if command -v zpool >/dev/null 2>&1; then
+    pool=
+    while IFS= read -r line; do
+        if [[ $line =~ ^[[:space:]]*pool:[[:space:]]+(.+) ]]; then
+            pool=${BASH_REMATCH[1]}
+            continue
+        fi
+        id=$(awk '{print $1}' <<<"$line")
+        case "$id" in
+            wwn-*|ata-*|scsi-*|nvme-*)
+                tgt=/dev/disk/by-id/$id
+                [ -e "$tgt" ] || continue
+                dev=$(basename "$(readlink -f "$tgt")")
+                [[ $dev =~ ^(sd[a-z]+)[0-9]+$ ]] && dev=${BASH_REMATCH[1]}
+                dev_pool[$dev]=$pool
+                ;;
+        esac
+    done < <(zpool status)
+fi
+
+mapfile -t slots < <(printf '%s\n' "${!slot_dev[@]}" | sort -n)
+
+echo "Enclosure: $enc"
+printf '%-5s %-5s %-7s %-22s %s\n' Slot Dev Size Model Pool
+printf '%-5s %-5s %-7s %-22s %s\n' ---- --- ---- ----- ----
+for s in "${slots[@]}"; do
+    dev=${slot_dev[$s]:-}
+    if [ -z "$dev" ]; then
+        printf '%-5s %-5s %-7s %-22s %s\n' "$s" "-" "-" "(${slot_status[$s]:-empty})" "-"
+    else
+        printf '%-5s %-5s %-7s %-22.22s %s\n' \
+            "$s" "$dev" "${dev_size[$dev]:--}" "${dev_model[$dev]:--}" "${dev_pool[$dev]:--}"
+    fi
+done
+
+echo
+echo "Shelf ${cols}x${rows} (slot 0 top-left, left->right top->bottom):"
+echo
+
+declare -A pool_color
+palette=(31 32 33 34 35 36 91 92 93 94 95 96)
+ci=0
+for p in $(printf '%s\n' "${dev_pool[@]}" | sort -u); do
+    [ -z "$p" ] && continue
+    pool_color[$p]=${palette[$ci]}
+    ci=$(( (ci+1) % ${#palette[@]} ))
+done
+
+use_color=1
+[ -t 1 ] || use_color=0
+
+cw=22
+hborder() {
+    local c
+    printf '+'
+    for ((c=0;c<cols;c++)); do
+        printf -- '%*s' $cw '' | tr ' ' '-'
+        printf '+'
+    done
+    printf '\n'
+}
+
+cell() {
+    local s=$1 line=$2
+    local dev=${slot_dev[$s]:-}
+    local pool= col=37
+    if [ -n "$dev" ]; then
+        pool=${dev_pool[$dev]:-}
+        [ -n "$pool" ] && col=${pool_color[$pool]:-37}
+    fi
+    local txt=
+    case $line in
+        1) if [ -n "$dev" ]; then
+               txt=$(printf 'slot %-2s %-7s' "$s" "$dev")
+           else
+               local st=${slot_status[$s]:-empty}
+               [ "$st" = "not installed" ] && st=empty
+               txt=$(printf 'slot %-2s %s' "$s" "$st")
+           fi ;;
+        2) [ -n "$dev" ] && txt=$(printf '%-7s %-12.12s' "${dev_size[$dev]:--}" "${dev_model[$dev]:-}") ;;
+        3) [ -n "$dev" ] && txt=${pool:-(no pool)} ;;
+    esac
+    if [ "$use_color" = 1 ]; then
+        printf ' \e[%sm%-*s\e[0m|' "$col" $((cw-1)) "$txt"
+    else
+        printf ' %-*s|' $((cw-1)) "$txt"
+    fi
+}
+
+slot_count=${#slots[@]}
+for ((r=0;r<rows;r++)); do
+    hborder
+    for ln in 1 2 3; do
+        printf '|'
+        for ((c=0;c<cols;c++)); do
+            idx=$((r*cols+c))
+            [ $idx -ge $slot_count ] && { printf ' %*s|' $((cw-1)) ''; continue; }
+            cell "${slots[$idx]}" "$ln"
+        done
+        printf '\n'
+    done
+done
+hborder
+
+echo
+echo "Pools:"
+for p in "${!pool_color[@]}"; do
+    if [ "$use_color" = 1 ]; then
+        printf '  \e[%sm%s\e[0m\n' "${pool_color[$p]}" "$p"
+    else
+        printf '  %s\n' "$p"
+    fi
+done