[systemd-devel] How to compile systemd v219

[Ankele zhang]

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
[image: image.png]

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