#!/bin/bash

build() {
    local mod crypttab

    map add_module 'dm-crypt' 'dm-integrity' 'hid-generic?'
    if [[ -n "$CRYPTO_MODULES" ]]; then
        for mod in $CRYPTO_MODULES; do
            add_module "$mod"
        done
    else
        add_all_modules '/crypto/'
    fi
    add_checked_modules '/drivers/char/tpm/'

    map add_udev_rule \
        '10-dm.rules' \
        '13-dm-disk.rules' \
        '60-fido-id.rules' \
        '95-dm-notify.rules'

    map add_systemd_unit 'cryptsetup.target' \
        'systemd-ask-password-console.path' \
        'systemd-ask-password-console.service'
    map add_binary \
        '/usr/lib/systemd/system-generators/systemd-cryptsetup-generator' \
        '/usr/lib/systemd/systemd-cryptsetup' \
        '/usr/lib/systemd/systemd-makefs' \
        '/usr/lib/cryptsetup/libcryptsetup-token-systemd-fido2.so' \
        '/usr/lib/cryptsetup/libcryptsetup-token-systemd-tpm2.so'

    # cryptsetup calls pthread_create(), which dlopen()s libgcc_s.so.1
    add_binary '/usr/lib/libgcc_s.so.1'

    # cryptsetup loads the legacy provider which is required for whirlpool
    add_binary '/usr/lib/ossl-modules/legacy.so'

    # add libraries dlopen()ed by systemd-cryptsetup
    for LIB in fido2 cryptsetup; do
        LC_ALL=C.UTF-8 find /usr/lib/ -maxdepth 1 -name "lib${LIB}.so*" | while read -r FILE; do
            if [[ -L "${FILE}" ]]; then
                add_symlink "${FILE}"
            else
                add_binary "${FILE}"
            fi
        done
    done

    # add mkswap for creating swap space on the fly (see 'swap' in crypttab(5))
    add_binary 'mkswap'

    # add NVPCR definition files
    map add_file /usr/lib/nvpcr/*.nvpcr

    if [[ -f /etc/crypttab.initramfs ]]; then
        add_file '/etc/crypttab.initramfs' '/etc/crypttab' 600
        warning '/etc/crypttab.initramfs is deprecated. Merge it into /etc/crypttab and add a x-initrd.attach option to the devices that need to be unlocked in the initramfs.'
    elif crypttab="$(awk '!/^\s*($|#)/ && $4 ~ /x-initrd\.attach/' /etc/crypttab 2>/dev/null)" && [[ -n "$crypttab" ]]; then
        printf '%s\n' "$crypttab" | add_file - '/etc/crypttab' 600
    fi
}

help() {
    cat <<HELPEOF
This hook allows systemd to unlock encrypted LUKS1 volumes with a password, and encrypted LUKS2 volumes with a password, FIDO2 token or TPM2 key. Unlocking of LUKS2 volumes with a PKCS#11 token is supported for some tokens by additional 'sd-encrypt-opensc' hook.

See the manpage of systemd-cryptsetup-generator(8) for available kernel
command line options. Alternatively, if /etc/crypttab contains lines with
x-initrd.attach in the fourth field, those lines will be added to /etc/crypttab
in the initramfs. See the crypttab(5) manpage for more information on crypttab
syntax.
HELPEOF
}

# vim: set ft=sh ts=4 sw=4 et: