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Respect prefix when sysconfdir isn't set in config.toml #113733

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Respect prefix when sysconfdir isn't set in config.toml #113733

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7 changes: 6 additions & 1 deletion src/bootstrap/install.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,12 @@ fn install_sh(
let _guard = builder.msg(Kind::Install, stage, package, host, host);

let prefix = default_path(&builder.config.prefix, "/usr/local");
let sysconfdir = prefix.join(default_path(&builder.config.sysconfdir, "/etc"));
// if prefix isn't specified, we want this to be an absolute path, outside `/usr/local`. but if it is specified, make sysconfdir relative.
let sysconfdir = if builder.config.prefix.is_some() {
prefix.join(default_path(&builder.config.sysconfdir, "etc"))
} else {
"/etc/".into()
};
Comment on lines +58 to +63
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@jyn514 jyn514 Jul 15, 2023 •
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i am not quite sure if this is the right fix - maybe it should just be changing /etc to etc so that it's always relative to the prefix? that seems more consistent at least (we'd end up with /usr/local/etc by default). but i don't know if people are depending on the existing behavior.

cc @cuviper, what are your thoughts?

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See also #113580, where I was suggesting this should just be a diagnostic.

When the prefix is /usr, you almost surely want /etc, not /usr/etc. But for /usr/local prefix, there is often a /usr/local/etc too, so the "local" installations are completely contained. So, I don't think there's a universally great answer, but changing the default feels a little risky.

For my part in distro builds: prefix, sysconfdir, and all the other installation dirs are explicitly set by the distro-default %configure rpm macro, so I shouldn't be affected by changes here either way.

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Maybe a simpler option is to require users to set prefix? I'm not sure how widespread source installs of Rust are, but my very rough guess is that many of those users either are using a non-default prefix today or may want to (e.g., distros probably don't want /usr/local, users installing themselves may want something in $HOME, etc.).

let datadir = prefix.join(default_path(&builder.config.datadir, "share"));
let docdir = prefix.join(default_path(&builder.config.docdir, "share/doc/rust"));
let mandir = prefix.join(default_path(&builder.config.mandir, "share/man"));
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