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Link to current nightly #55

Merged
merged 4 commits into from Feb 24, 2020
Merged

Link to current nightly #55

merged 4 commits into from Feb 24, 2020

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pnkfelix
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Fix code that was trying reuse an already installed nightly, by making install call out to rustup toolchain link to link the currently installed nightly up to the new "bisector-nightly-xxx" that we expect.

Fix #54

@pnkfelix
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r? @spastorino

@Mark-Simulacrum
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This looks slightly wrong to me. The default toolchain could be nightly-2020-01-04, in which case our synthesis of the link path is wrong i believe. I suspect we should instead run rustc --print sysroot or so and get the path from there.

I was also concerned about removing someone's installed nightly, but it looks like remove_dir_all isn't supposed to follow symlinks (though I'm not sure what behavior is like for hardlinks, I believe rustup link doesn't create those). I guess modulo rust-lang/rust#48504 but hopefully we don't hit that.

@pnkfelix
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The default toolchain could be nightly-2020-01-04, in which case our synthesis of the link path is wrong i believe. I suspect we should instead run rustc --print sysroot or so and get the path from there.

Yeah I just realized this while I was experimenting with this and happened to be making local changes to my rustup's default nightly. Let me see if I can fix it.

(It seems like rustup is missing some functionality here, no? I.e. I could imagine we "need" a subcommand like rustup toolchain print-install-dir <toolchain> or something along those lines...)

@pnkfelix pnkfelix changed the title Link to current nightly [WIP] Link to current nightly Feb 21, 2020
@Mark-Simulacrum
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Yes, rustup isn't really ready for scripting today, semi-intentionally. Or so I recall hearing from @kinnison... I think.

spastorino
spastorino reviewed Feb 21, 2020
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@pnkfelix
Fix code that was trying reuse an already installed nightly.
661b76d 
Before, we would just skip attempts to install a current nightly. (And then, we
would unconditionally fail the run as documented on issue rust-lang#54, regardless
whether of whether the regression was actually visible on that version, due to
it not being installed with the name "bisector-nightly-xxx" that we expect.)

This commit fixes that. It makes `install` call out to `rustup toolchain link`
to link the current rustc (as reported via `rustc --print sysroot`) up to the
new "bisector-nightly-xxx" that we expect.

(I also refactored the code to construct `DownloadParams`; that refactoring was
more relevant in an earlier version of the code that was linking in a different
(buggy) way.)
@pnkfelix
This updates the remove function to remove the installed directory
e819b3a 
unconditionally.

This is a sort of scary thing to do, so I added a safe-guard to double-check
that whatever directory we are removing, it is one of the ones starts with
"bisector" and thus is something cargo-bisect-rustc is implicitly in charge of.
@pnkfelix
Realized there was another case where we delete directories "blindly"…
f8f6b6e 
…: forced installs.

Extended safeguard from previous commit to cover that case too.
@pnkfelix
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(just forced-push a new version that uses rustc --print sysroot to figure out the directory to link to, instead of trying to (incorrectly) infer it.)

@pnkfelix @spastorino
fix typo in src/main.rs
b074ad7 
thanks @spastorino

Co-Authored-By: Santiago Pastorino <spastorino@gmail.com>
@pnkfelix pnkfelix changed the title [WIP] Link to current nightly Link to current nightly Feb 22, 2020
@pnkfelix
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I was also concerned about removing someone's installed nightly, but it looks like remove_dir_all isn't supposed to follow symlinks

You know, a way to definitely avoid this risk is to "just" fully copy the directory tree locally, rather than use a symbolic link. And then the resulting directory structure for the bisector variants would be totally uniform, and it would also avoid the risk (when using --preserve) of a user independently removing an installed nightly that we linked to...

(it would also be wasteful of disk space, of course... but that might be a micro-optimization for something like this.)

Its at least something to consider, though I would be happy just landing this PR as is, rather than bikeshedding this question.

@spastorino spastorino merged commit 4f67573 into rust-lang:master Feb 24, 2020
@ehuss ehuss mentioned this pull request Dec 31, 2020
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nightly for rustup default breaks cargo-bisectc-rustc when start..end range overaps current nightly
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@pnkfelix @Mark-Simulacrum @spastorino