rustup is not installed at /home/user/.cargo

[leshow]

>  ~  rustup update
info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
info: syncing channel updates for 'nightly-x86_64-unknown-linux-gnu'
error: rustup is not installed at '/home/leshow/.cargo'
>  ~  rustup --version
rustup 0.1.12 (c6e430a 2016-05-12)

Rustup appears to work properly, i can download toolchains and swap them, but it throws this error on update.

i previously had this error with 0.1.11, and read that deleting .multirust was the solution. I deleted .cargo and .multirust and installed rustup 0.1.12, the problem persists.

[brson]

This error happens when the file ~/.cargo/bin/multirust does not exist (the name of this file is historical and well be phased out soon). Do you have that file?

[leshow]

no, i do not. should i cargo install multirust?

[brson]

No don't do that. ~/.cargo/bin/multirust should be installed by rustup. For some reason it isn't for you. Does that file exist immediately after install? Can you identify at what point it disappears?

[leshow]

I have uninstalled and re-installed rustup multiple times and this file never gets created.

rustup seem to work, but the error still happens every time I update

[brson]

I still have no clue what might be happening here, but you might be able to figure out what's going on with strace:

brian@ip-10-145-43-250:~/dev/rustup.rs⟫ strace target/release/rustup-init -y 2>&1 | grep bin/multirust
stat("/home/brian/.multirust/bin/multirust", 0x7ffc3f5985a0) = -1 ENOENT (No such file or directory)
stat("/home/brian/.cargo/bin/multirust", {st_mode=S_IFREG|0755, st_size=6231904, ...}) = 0
unlink("/home/brian/.cargo/bin/multirust") = 0
open("/home/brian/.cargo/bin/multirust", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 4
chmod("/home/brian/.cargo/bin/multirust", 0775) = 0
stat("/home/brian/.cargo/bin/multirust", {st_mode=S_IFREG|0775, st_size=6231904, ...}) = 0
chmod("/home/brian/.cargo/bin/multirust", 0755) = 0
link("/home/brian/.cargo/bin/multirust", "/home/brian/.cargo/bin/rustup") = 0
link("/home/brian/.cargo/bin/multirust", "/home/brian/.cargo/bin/rustc") = 0
link("/home/brian/.cargo/bin/multirust", "/home/brian/.cargo/bin/rustdoc") = 0
link("/home/brian/.cargo/bin/multirust", "/home/brian/.cargo/bin/cargo") = 0
link("/home/brian/.cargo/bin/multirust", "/home/brian/.cargo/bin/rust-lldb") = 0
link("/home/brian/.cargo/bin/multirust", "/home/brian/.cargo/bin/rust-gdb") = 0

You can see here that bin/multirust is the "main" rustup binary; it's installed first, then rustup, rustc etc are symlinked to it. That rustup works for you means those symlinks must be linking to something. Where do they link to?

[leshow]

i have installed rustup from src via the AUR see pkgbuild

rustup and multirust are located in /usr/bin, since i don't have a rustup.rs directory checked out, i'm not sure where to run that strace.

[brson]

Huh, were you using the AUR build of rustup in the original post? If they are modifying rustup to install to a system dir then that would explain why the self update doesn't see itself as installed.

[jonas-schievink]

@brson That's whats happening. Will this configuration be supported eventually?

[brson]

@jonas-schievink I'd like it to be. I think at the least rustup needs to be compiled so that update does not do a self-update and rustup self update generates an error. Haven't thought about what else will be required.

[brson]

Added a bug to compile out self updates #597

[Diggsey]

This has been implemented, any remaining work will be upstream to take advantage of --no-self-update