From a617232f249ba6ec135cc603aa19adab40fb1fa4 Mon Sep 17 00:00:00 2001
From: Chao Chen <209239467+surlymochan@users.noreply.github.com>
Date: Sun, 18 Oct 2026 12:42:33 +0800
Subject: [PATCH] fix(pstack): read transcript mtimes with GNU stat and date in
 worktree-audit

---
 .../skills/poteto-mode/scripts/worktree-audit.sh     | 12 ++++++++++--
 pstack/skills/poteto-mode/scripts/worktree-audit.sh  | 12 ++++++++++--
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/harness/pstack/claude-code/skills/poteto-mode/scripts/worktree-audit.sh b/harness/pstack/claude-code/skills/poteto-mode/scripts/worktree-audit.sh
index 743c4e925..47e08919d 100755
--- a/harness/pstack/claude-code/skills/poteto-mode/scripts/worktree-audit.sh
+++ b/harness/pstack/claude-code/skills/poteto-mode/scripts/worktree-audit.sh
@@ -47,6 +47,14 @@ origin/*) git fetch origin "+refs/heads/${base#origin/}:refs/remotes/$base" --qu
 esac
 git rev-parse --verify --quiet "$base^{commit}" >/dev/null 2>&1 || { echo "error: base ref not found: $base" >&2; exit 1; }
 
+# GNU coreutils (Linux, Homebrew gnubin) reads `stat -f` as file system status
+# and `date -r` as a file, so pick the stat and date flags once.
+if stat -c %Y / >/dev/null 2>&1; then
+	stat_fmt=(-c '%Y %n'); fmt_day() { date -d "@$1" '+%Y-%m-%d'; }
+else
+	stat_fmt=(-f '%m %N'); fmt_day() { date -r "$1" '+%Y-%m-%d'; }
+fi
+
 # PR state by branch, fetched once as [{number, state, head}] with a lowercase
 # state. Origin when its CLI can read this repo's PRs, otherwise gh. Empty when
 # neither can.
@@ -105,9 +113,9 @@ git worktree list --porcelain | awk '/^worktree /{print $2}' | while read -r wt;
 	last="-"; last_ts=0
 	if [ -d "$transcripts" ]; then
 		f=$(rg -l -e "${wt}/" -e "${wt}\"" "$transcripts" 2>/dev/null \
-			| xargs stat -f '%m %N' 2>/dev/null | sort -rn | head -1)
+			| xargs stat "${stat_fmt[@]}" 2>/dev/null | sort -rn | head -1)
 		if [ -n "$f" ]; then last_ts=$(echo "$f" | awk '{print $1}')
-			last=$(date -r "$last_ts" '+%Y-%m-%d' 2>/dev/null); fi
+			last=$(fmt_day "$last_ts" 2>/dev/null); fi
 	fi
 	recent=$([ "$last_ts" -gt 0 ] 2>/dev/null && [ $(( (now - last_ts) / 86400 )) -le 4 ] && echo yes || echo no)
 
diff --git a/pstack/skills/poteto-mode/scripts/worktree-audit.sh b/pstack/skills/poteto-mode/scripts/worktree-audit.sh
index 743c4e925..47e08919d 100755
--- a/pstack/skills/poteto-mode/scripts/worktree-audit.sh
+++ b/pstack/skills/poteto-mode/scripts/worktree-audit.sh
@@ -47,6 +47,14 @@ origin/*) git fetch origin "+refs/heads/${base#origin/}:refs/remotes/$base" --qu
 esac
 git rev-parse --verify --quiet "$base^{commit}" >/dev/null 2>&1 || { echo "error: base ref not found: $base" >&2; exit 1; }
 
+# GNU coreutils (Linux, Homebrew gnubin) reads `stat -f` as file system status
+# and `date -r` as a file, so pick the stat and date flags once.
+if stat -c %Y / >/dev/null 2>&1; then
+	stat_fmt=(-c '%Y %n'); fmt_day() { date -d "@$1" '+%Y-%m-%d'; }
+else
+	stat_fmt=(-f '%m %N'); fmt_day() { date -r "$1" '+%Y-%m-%d'; }
+fi
+
 # PR state by branch, fetched once as [{number, state, head}] with a lowercase
 # state. Origin when its CLI can read this repo's PRs, otherwise gh. Empty when
 # neither can.
@@ -105,9 +113,9 @@ git worktree list --porcelain | awk '/^worktree /{print $2}' | while read -r wt;
 	last="-"; last_ts=0
 	if [ -d "$transcripts" ]; then
 		f=$(rg -l -e "${wt}/" -e "${wt}\"" "$transcripts" 2>/dev/null \
-			| xargs stat -f '%m %N' 2>/dev/null | sort -rn | head -1)
+			| xargs stat "${stat_fmt[@]}" 2>/dev/null | sort -rn | head -1)
 		if [ -n "$f" ]; then last_ts=$(echo "$f" | awk '{print $1}')
-			last=$(date -r "$last_ts" '+%Y-%m-%d' 2>/dev/null); fi
+			last=$(fmt_day "$last_ts" 2>/dev/null); fi
 	fi
 	recent=$([ "$last_ts" -gt 0 ] 2>/dev/null && [ $(( (now - last_ts) / 86400 )) -le 4 ] && echo yes || echo no)