How to compile systemd v219

[Ankele zhang <ankelezhang@xxxxxxxxx>]

On CentOS7.6(3.10.0-957.el7.x86_64), I encrypt my root disk and I have to enter my passphrase while booting my CentOS before mount root disk. Now, I want to hardcode the passphrase into the program, what should I do?

I have tried to recompile `systemd` source V219 but I don not really understand how to compile it correctly. So I test on Fedora31(5.3.7-301.fc31.x86_64), compile `systemd` V243 and replace the executable binary in initramfs-$(uname -r).img with the compiled systemd-cryptsetup file. But it does not work.

and I execute `file new_systemd-cryptsetup` and execute `file old_systemd-cryptsetup`, I got some difference between them.

# file systemd-cryptsetup
> systemd-cryptsetup: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=9935897aeaf65a746e86f8af2c2a960c4a316acc, for GNU/Linux 3.2.0, with debug_info, not stripped

# file systemd-cryptsetup.bak

> systemd-cryptsetup.bak: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=fe13d068d10950b02945537972a4f5b687f41cc0, for GNU/Linux 3.2.0, stripped

I'm dying to know how to compile correctly, thank you very much.

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