ops: minute-precision retention (find -mtime +N truncates to >=N+1 days) — TK-10236

5c1b5c47c6b4acfee6cb9009cde6ef48cfa982ae · 2026-08-05 07:50:32 -0700 · Steve Abrams

Files touched

M ops/prune-snapshot-cache.sh

Diff

commit 5c1b5c47c6b4acfee6cb9009cde6ef48cfa982ae
Author: Steve Abrams <steve@designerwallcoverings.com>
Date:   Wed Aug 5 07:50:32 2026 -0700

    ops: minute-precision retention (find -mtime +N truncates to >=N+1 days) — TK-10236
---
 ops/prune-snapshot-cache.sh | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/ops/prune-snapshot-cache.sh b/ops/prune-snapshot-cache.sh
index d3ce2b1a..f05a8cf9 100755
--- a/ops/prune-snapshot-cache.sh
+++ b/ops/prune-snapshot-cache.sh
@@ -18,6 +18,9 @@ SNAP="${SNAP_DIR:-/root/Projects/homesonspec/var/snapshots}"
 RETAIN_DAYS="${RETAIN_DAYS:-7}"
 LIVE_MIN="${LIVE_MIN:-15}"
 APPLY=0; [ "${1:-}" = "--apply" ] && APPLY=1
+# Use minute precision, not -mtime: `find -mtime +N` integer-truncates age, so +7 == ">=8 days".
+# -mmin +(RETAIN_DAYS*1440) means ">RETAIN_DAYS.0 days" exactly, matching the reclaim curve.
+RETAIN_MIN=$((RETAIN_DAYS*1440))
 gb(){ awk -v b="${1:-0}" 'BEGIN{printf "%.2f", b/1073741824}'; }
 
 [ -d "$SNAP" ] || { echo "ERROR: snapshot dir not found: $SNAP"; exit 1; }
@@ -35,14 +38,14 @@ for d in "$SNAP"/*/; do
   if [ -n "$(find "$d" -type f -mmin -"$LIVE_MIN" 2>/dev/null | head -1)" ]; then
     skipped="$skipped $b"; continue
   fi
-  cnt=$(find "$d" -type f -mtime +"$RETAIN_DAYS" 2>/dev/null | wc -l | tr -d ' ')
+  cnt=$(find "$d" -type f -mmin +"$RETAIN_MIN" 2>/dev/null | wc -l | tr -d ' ')
   [ "${cnt:-0}" -eq 0 ] && continue
-  bytes=$(find "$d" -type f -mtime +"$RETAIN_DAYS" -printf '%s\n' 2>/dev/null | awk '{s+=$1} END{print s+0}')
+  bytes=$(find "$d" -type f -mmin +"$RETAIN_MIN" -printf '%s\n' 2>/dev/null | awk '{s+=$1} END{print s+0}')
   printf "%-30s %10d %9sG  %s\n" "$b" "$cnt" "$(gb "$bytes")" "$([ $APPLY -eq 1 ] && echo DELETE || echo would-prune)"
   total_files=$((total_files+cnt)); total_bytes=$((total_bytes+bytes))
   if [ $APPLY -eq 1 ]; then
-    find "$d" -type f -mtime +"$RETAIN_DAYS" -printf '%p\n' 2>/dev/null >> "$MANIFEST"
-    find "$d" -type f -mtime +"$RETAIN_DAYS" -delete 2>/dev/null
+    find "$d" -type f -mmin +"$RETAIN_MIN" -printf '%p\n' 2>/dev/null >> "$MANIFEST"
+    find "$d" -type f -mmin +"$RETAIN_MIN" -delete 2>/dev/null
   fi
 done
 echo ""

← eb45f0f3 ops: age-based retention prune for snapshot page-cache (7d, · back to Homesonspec · prune: fail-open per-builder (|| true vs pipefail abort) + S 53ff5542 →