tests: add check-errors.sh for detecting system-level build problems

tests/check-errors.sh

+#!/bin/sh
+# Analyze epm-errors/ logs for system-level problems
+# that indicate the build cycle should be stopped.
+#
+# Usage: check-errors.sh [epm-errors-dir]
+# Exit codes: 0 = only app-level errors, 1 = system problems found
+
+EDIR="${1:-$HOME/epm-errors}"
+
+[ -d "$EDIR" ] || { echo "No errors directory: $EDIR" ; exit 0 ; }
+
+found=0
+
+# Patterns indicating system-level problems (not app-specific bugs)
+check_pattern()
+{
+    local pattern="$1"
+    local desc="$2"
+    local matches
+    matches=$(grep -rl "$pattern" "$EDIR"/ 2>/dev/null | while read f; do
+        basename "$f"
+    done | sort -u)
+    if [ -n "$matches" ] ; then
+        found=1
+        local count=$(echo "$matches" | wc -l)
+        echo "  $desc ($count apps):"
+        echo "$matches" | head -5 | sed 's/^/    /'
+        [ "$count" -gt 5 ] && echo "    ... and $((count - 5)) more"
+    fi
+}
+
+echo "=== System-level errors in $EDIR ==="
+
+# Package duplicates prevent any installation
+check_pattern 'несколько версий пакета' 'Package duplicates (need epm dedup)'
+
+# Disk space
+check_pattern 'needs.*on the.*filesystem' 'Disk space insufficient'
+check_pattern 'нет свободного места' 'Disk space insufficient'
+
+# Transaction errors (broken rpm db, etc.)
+check_pattern 'Ошибка во время исполнения транзакции' 'Transaction execution error'
+
+# RPM database lock
+check_pattern "can.t create transaction lock" 'RPM database locked'
+check_pattern 'cannot open Packages' 'RPM database corrupted'
+
+echo ""
+echo "=== Error summary ==="
+total=$(ls "$EDIR"/ 2>/dev/null | grep -vc errors.txt)
+echo "Total failed apps: $total"
+
+if [ "$found" = 1 ] ; then
+    echo "SYSTEM PROBLEMS DETECTED - fix before continuing rebuild cycle"
+    exit 1
+else
+    echo "No system-level problems (all errors are app-specific)"
+    exit 0
+fi