From 1cef71d26566ae914f097718325e600dae14d2e1 Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Thu, 6 Aug 2026 14:52:39 +0200
Subject: [PATCH] fix: Remove obsolete rebuilt custom ISOs (#2077)

---
 src/install.sh | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/install.sh b/src/install.sh
index 602aa4e2..c8b05835 100644
--- a/src/install.sh
+++ b/src/install.sh
@@ -419,8 +419,8 @@ skipInstall() {
 
   if [ -n "$previousBase" ]; then
 
-    # Older releases stored the original download name in windows.base. New
-    # releases always store the final ISO name, so migrate legacy state once.
+    # Older releases stored the original download name in windows.base. Current
+    # releases store an ISO source identity, so migrate legacy state once.
     if [[ "${previousBase,,}" != *.iso ]]; then
 
       if isCompressed "$previousBase" || [[ "${previousBase,,}" == *.esd ]]; then
@@ -437,6 +437,15 @@ skipInstall() {
 
     fi
 
+    # Older releases may have left a rebuilt custom ISO at its synthetic source
+    # identity. A completed installation no longer needs that installation media.
+    if [[ "${previousBase,,}" == "windows."* ]] && [ -f "$boot" ] && hasData; then
+      if ! rm -f -- "$STORAGE/$previousBase"; then
+        error "Failed to remove obsolete ISO file \"$STORAGE/$previousBase\" !"
+        exit 50
+      fi
+    fi
+
     # A changed source invalidates an unfinished installation. Back up an
     # existing installation, but discard stale media when no disk exists yet.
     if [[ "${STORAGE,,}/${previousBase,,}" != "${iso,,}" ]]; then
@@ -590,7 +599,7 @@ findFile() {
 
   ISO="$file"
   CUSTOM="$file"
-  # Include the custom ISO size in its persistent name so replacing a
+  # Encode the custom ISO size in a synthetic source identity so replacing a
   # bind-mounted ISO is detected as a different installation source.
   BOOT="$STORAGE/windows.$size.iso"