validate.sh

#!/bin/bash
# Validates task4_1.out against the required format rules.
# Usage: ./validate.sh [path/to/task4_1.out]

FILE="${1:-task4_1.out}"
ERRORS=0

fail() { echo "FAIL: $1"; ERRORS=$((ERRORS + 1)); }
pass() { echo "OK:   $1"; }

if [ ! -f "$FILE" ]; then
    fail "Output file '$FILE' not found"
    exit 1
fi

# Read entire file into array of lines
mapfile -t LINES < "$FILE"
TOTAL=${#LINES[@]}

check_line() {
    local idx="$1" expected_prefix="$2" allowed_chars="$3"
    local line="${LINES[$idx]}"

    # Must start with exact prefix (field name + ": ")
    if [[ "$line" != "$expected_prefix"* ]]; then
        fail "Line $((idx+1)): expected '$expected_prefix...', got: '$line'"
        return
    fi
    local value="${line#"$expected_prefix"}"
    # Must not start with a space (would mean two spaces after colon)
    if [[ "$value" == " "* ]]; then
        fail "Line $((idx+1)): extra space after colon in '$line'"
        return
    fi
    # Check allowed characters in value (optional — only when pattern given)
    if [ -n "$allowed_chars" ] && [[ "$value" =~ [^$allowed_chars] ]]; then
        fail "Line $((idx+1)): disallowed characters in value: '$value'"
        return
    fi
    pass "Line $((idx+1)): $expected_prefix..."
}

# Expected line order
IDX=0
check_line $IDX "--- Hardware ---"; IDX=$((IDX+1))
check_line $IDX "CPU: ";            IDX=$((IDX+1))
check_line $IDX "RAM: ";            IDX=$((IDX+1))
check_line $IDX "Motherboard: ";    IDX=$((IDX+1))
check_line $IDX "System Serial Number: "; IDX=$((IDX+1))
check_line $IDX "--- System ---";   IDX=$((IDX+1))
check_line $IDX "OS Distribution: "; IDX=$((IDX+1))
check_line $IDX "Kernel version: " "[^ ]"; IDX=$((IDX+1))  # no spaces allowed
check_line $IDX "Installation date: "; IDX=$((IDX+1))
check_line $IDX "Hostname: ";       IDX=$((IDX+1))
check_line $IDX "Uptime: ";         IDX=$((IDX+1))
check_line $IDX "Processes running: " "0-9"; IDX=$((IDX+1))
check_line $IDX "Users logged in: " "0-9"; IDX=$((IDX+1))
check_line $IDX "--- Network ---";  IDX=$((IDX+1))

# Network lines: one per interface
if [ "$IDX" -ge "$TOTAL" ]; then
    fail "No network interface lines found"
else
    while [ "$IDX" -lt "$TOTAL" ]; do
        line="${LINES[$IDX]}"
        if [[ "$line" =~ ^[a-zA-Z0-9._-]+:\ .+$ ]]; then
            val="${line#*: }"
            if [[ "$val" =~ [^0-9./,\ -] ]]; then
                fail "Line $((IDX+1)): disallowed character in network line: '$line'"
            else
                pass "Line $((IDX+1)): network: $line"
            fi
        else
            fail "Line $((IDX+1)): malformed network line: '$line'"
        fi
        IDX=$((IDX+1))
    done
fi

echo ""
if [ "$ERRORS" -eq 0 ]; then
    echo "All checks passed."
else
    echo "$ERRORS check(s) failed."
    exit 1
fi