From fb2a3585d48e7ac20336c71f7adcbfb97d42ed09 Mon Sep 17 00:00:00 2001
From: BeauTroll <->
Date: Wed, 17 Dec 2025 19:43:04 +0100
Subject: [PATCH] Improve disk space estimation messages in backup
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Add compressed size estimation and better error handling:
- Show both uncompressed (for safety) and estimated compressed size
- Handle calculation failure gracefully with clear message
- Estimate compression ratio at ~90% (divide by 10)
- Add conditional check to prevent arithmetic errors

Example output:
- Espace requis (non compressé + 20%): 1.7GiB
- Espace estimé après compression: 170MiB
- Archive finale: 55MiB (actual result)

This helps users understand why the required space seems larger
than the final backup size (compression factor).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
---
 scripts/backup.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/scripts/backup.sh b/scripts/backup.sh
index ef0d630..fa06f7e 100755
--- a/scripts/backup.sh
+++ b/scripts/backup.sh
@@ -106,7 +106,14 @@ if [ -z "$AVAILABLE_SPACE" ]; then
   exit 1
 fi
 
-log "INFO" "Espace requis (estimé): $(numfmt --to=iec-i --suffix=B "$REQUIRED_SPACE" 2>/dev/null || echo "$REQUIRED_SPACE bytes")"
+# Calculer estimation avec compression (ratio moyen ~90%)
+if [ "$REQUIRED_SPACE" -gt 0 ] 2>/dev/null; then
+  ESTIMATED_COMPRESSED=$((REQUIRED_SPACE / 10))
+  log "INFO" "Espace requis (non compressé + 20%): $(numfmt --to=iec-i --suffix=B "$REQUIRED_SPACE" 2>/dev/null || echo "$REQUIRED_SPACE bytes")"
+  log "INFO" "Espace estimé après compression: $(numfmt --to=iec-i --suffix=B "$ESTIMATED_COMPRESSED" 2>/dev/null || echo "$ESTIMATED_COMPRESSED bytes")"
+else
+  log "INFO" "Espace requis: Impossible à calculer (utilisation du fallback)"
+fi
 log "INFO" "Espace disponible: $(numfmt --to=iec-i --suffix=B "$AVAILABLE_SPACE" 2>/dev/null || echo "$AVAILABLE_SPACE bytes")"
 
 # Comparaison sécurisée avec validation