feat: add optional wipe tool fallbacks by device type

.continue/rules/project.md

@@ -14,6 +14,12 @@ description: mtm-ddwipe project conventions
 - Keep messages short and clear.
 - Keep help concise, usage-first, and warning-focused.
 - Preserve the fallback wipe flow: secure discard, zero discard, then `dd` zero-fill.
+- Keep optional tools optional.
+- Use extra wipe methods only if the command is present.
+- Use `ddrescue` or `dd_rescue` only after `dd` fails.
+- Keep `nvme-cli` and `hdparm` optional.
+- Use `nvme` and `hdparm` only on matching device types.
+- Do not make new external tools required.
 - Keep changes minimal and preserve intent.
 - Keep `./continue/rules/project.md` aligned and concise.
 - If non-interactive support is added, make it an opt-in safety flag.
@@ -21,3 +27,4 @@ description: mtm-ddwipe project conventions
 # Project identity
 - Main script: `mtm-ddwipe`
 - License: GNU GPL v3
+

mtm-ddwipe

@@ -13,9 +13,10 @@ Usage: mtm-ddwipe DEVICE
 Wipe a block device.
 
 Warnings:
-  - This is destructive and irreversible.
+  - Destructive and irreversible.
-  - The target device must not be mounted or in use.
+  - Target must not be mounted or in use.
-  - blkdiscard support depends on the device and firmware.
+  - Optional tools: blkdiscard, ddrescue, dd_rescue, nvme-cli, hdparm.
+  - nvme and hdparm need matching device types.
   - dd fallback may take a long time.
 
 Version: ${VERSION}
@@ -67,6 +68,26 @@ check_device_not_in_use() {
 	fi
 }
 
+is_nvme_device() {
+	local dev="$1"
+	local sysdev
+
+	sysdev="/sys$(lsblk -ndo PATH "$dev" 2>/dev/null | head -n1)"
+	[ -n "$sysdev" ] || return 1
+	[ -e "$sysdev" ] || return 1
+	[ -d "$sysdev/device" ] || return 1
+	[ -e "$sysdev/device/uevent" ] || return 1
+	grep -q '^NVME=1$' "$sysdev/device/uevent"
+}
+
+is_ata_device() {
+	local dev="$1"
+	local tran
+
+	tran="$(lsblk -ndo TRAN "$dev" 2>/dev/null | head -n1)"
+	[ "$tran" = "sata" ] || [ "$tran" = "ata" ]
+}
+
 confirm_wipe() {
 	local dev="$1"
 	local choice=""
@@ -135,8 +156,40 @@ wipe_with_dd() {
 
 	log "dd zero"
 	dd if=/dev/zero of="$dev" bs=1M status=progress conv=fsync
-	log "Wiped with dd, check if full size is written."
+}
-	log "Otherwise use a mechanical destruction of the device."
+
+wipe_with_ddrescue() {
+	local dev="$1"
+
+	command -v ddrescue >/dev/null 2>&1 || return 1
+	log "ddrescue zero"
+	ddrescue -f -n /dev/zero "$dev"
+}
+
+wipe_with_dd_rescue() {
+	local dev="$1"
+
+	command -v dd_rescue >/dev/null 2>&1 || return 1
+	log "dd_rescue zero"
+	dd_rescue -f /dev/zero "$dev"
+}
+
+wipe_with_nvme() {
+	local dev="$1"
+
+	command -v nvme >/dev/null 2>&1 || return 1
+	is_nvme_device "$dev" || return 1
+	log "nvme format"
+	nvme format "$dev" -s 1 >/dev/null
+}
+
+wipe_with_hdparm() {
+	local dev="$1"
+
+	command -v hdparm >/dev/null 2>&1 || return 1
+	is_ata_device "$dev" || return 1
+	log "hdparm secure erase"
+	hdparm --security-erase NULL "$dev"
 }
 
 wipe_dev() {
@@ -164,6 +217,20 @@ wipe_dev() {
 		return
 	fi
 
+	echo ""
+	if wipe_with_nvme "$dev"; then
+		echo ""
+		log "Device $dev wiped."
+		return
+	fi
+
+	echo ""
+	if wipe_with_hdparm "$dev"; then
+		echo ""
+		log "Device $dev wiped."
+		return
+	fi
+
 	echo ""
 	if wipe_with_dd "$dev"; then
 		echo ""
@@ -171,6 +238,20 @@ wipe_dev() {
 		return
 	fi
 
+	echo ""
+	if wipe_with_ddrescue "$dev"; then
+		echo ""
+		log "Device $dev wiped."
+		return
+	fi
+
+	echo ""
+	if wipe_with_dd_rescue "$dev"; then
+		echo ""
+		log "Device $dev wiped."
+		return
+	fi
+
 	die "Wipe failed. The device may not be fully overwritten."
 }