version-check.sh

#!/bin/bash
# Host system verification for LFS arm64-r13.0-74
# Run on Debian 13 ARM64 before starting the build.

export LC_ALL=C

PASS=0
FAIL=0

check() {
    local name="$1"
    local cmd="$2"
    local min="$3"
    local actual

    actual=$(eval "$cmd" 2>/dev/null | head -1)
    if [ -z "$actual" ]; then
        echo "MISSING  $name"
        ((FAIL++))
    else
        echo "OK       $name: $actual"
        ((PASS++))
    fi
}

check_version() {
    local name="$1"
    local cmd="$2"
    local min_major="$3"
    local min_minor="$4"

    local actual
    actual=$(eval "$cmd" 2>/dev/null | head -1)
    if [ -z "$actual" ]; then
        echo "MISSING  $name"
        ((FAIL++))
        return
    fi

    local ver
    ver=$(echo "$actual" | grep -oP '\d+\.\d+' | head -1)
    local major minor
    major=$(echo "$ver" | cut -d. -f1)
    minor=$(echo "$ver" | cut -d. -f2)

    if [ "${major:-0}" -gt "$min_major" ] || \
       { [ "${major:-0}" -eq "$min_major" ] && [ "${minor:-0}" -ge "$min_minor" ]; }; then
        echo "OK       $name: $actual"
        ((PASS++))
    else
        echo "TOO OLD  $name: $actual (need >= ${min_major}.${min_minor})"
        ((FAIL++))
    fi
}

echo "=== LFS arm64-r13.0-74 Host System Check ==="
echo ""

# Shell
echo "--- Shell ---"
check_version "Bash" "bash --version" 3 2
echo "/bin/sh -> $(readlink -f /bin/sh)"
if [ "$(readlink -f /bin/sh)" = "$(which bash)" ]; then
    echo "OK       /bin/sh points to bash"
else
    echo "WARN     /bin/sh does NOT point to bash (points to $(readlink -f /bin/sh))"
    echo "         Fix: sudo ln -sf bash /bin/sh"
    ((FAIL++))
fi

echo ""
echo "--- Compilers & Linker ---"
check_version "GCC" "gcc --version" 5 2
check_version "G++" "g++ --version" 5 2
check "Binutils (ld)" "ld --version"
check "Binutils (as)" "as --version"

echo ""
echo "--- Build tools ---"
check_version "Make" "make --version" 4 0
check "Bison" "bison --version"
check "Gawk" "gawk --version"
check "M4" "m4 --version"
check "Texinfo (makeinfo)" "makeinfo --version"
check "Perl" "perl --version"
check_version "Python3" "python3 --version" 3 4

echo ""
echo "--- Libraries ---"
check_version "Glibc" "ldd --version" 2 11
check "Zlib headers" "test -f /usr/include/zlib.h && echo 'zlib.h found'"

echo ""
echo "--- Utilities ---"
check "wget" "wget --version"
check "curl" "curl --version"
check "tar" "tar --version"
check "xz" "xz --version"

echo ""
echo "=== Results ==="
echo "Passed: $PASS"
echo "Failed/Missing: $FAIL"
echo ""

if [ "$FAIL" -eq 0 ]; then
    echo "All checks passed. Host is ready for the LFS build."
else
    echo "Fix the above issues before starting the LFS build."
    echo "Install missing packages: sudo apt install build-essential bison gawk texinfo m4 wget curl"
    exit 1
fi