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rust/src/bwrap.rs: check for fuse version #5074

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rust/src/bwrap.rs: check for fuse version #5074

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jmarrero
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@jmarrero jmarrero commented Aug 29, 2024 •
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We have been building with fuse but changed to fuse3 on:
https://src.fedoraproject.org/rpms/rpm-ostree/c/3c602a23787fd2df873c0b18df3133c9fec4b66a
However our code is just calling fuse's fusermount.
We are updating our spec and code based on the discusion on:
#5047

Co-authored-by: @cgwalters

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Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

cgwalters
cgwalters reviewed Aug 29, 2024
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build.rs Outdated
@@ -16,6 +32,29 @@ fn detect_fedora_feature() -> Result<()> {
Ok(())
}

fn detect_el9_or_older() -> Result<()> {
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I'm not opposed to doing it this way but I think it will actually be cleaner to:

  • Add a fuse3 feature on the rust side
  • Change the spec file to enable it

Look at how this is done for the RHSM stuff in the spec:
%{?with_rhsm:--enable-featuresrs=rhsm}

Ugh well...I guess we'd need to concatenate it in the spec file...

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Ahh I see, yeah that makes more sense.

cgwalters
cgwalters reviewed Aug 29, 2024
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rust/src/bwrap.rs Outdated
Comment on lines 125 to 128
let mut fuse_command = "fusermount3";

#[cfg(feature = "el_9_or_older")]
fuse_command = "fusermount";
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   let fuse_command = if cfg!(feature = "el_9_or_older")) { "fusermount" } else {"fusermount3" };

cgwalters
cgwalters reviewed Aug 29, 2024
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build.rs Outdated
Comment on lines 6 to 7
if let Some(pos) = platform_id.find("el") {
let version_part = &platform_id[pos + 2..]; // Skip "el"
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Try using platform_id.split_once("el")

@cgwalters
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Ugh sorry there's something I just realized now too...in theory we should support other distributions and who knows how they have fuse set up.

I keep circling back to...really, either of fusermount or fusermount3 should work so we basically probe dynamically at runtime and use fusermount3 if it exists first.

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But to do that we need to know that we can run fusermount3 against a fuse mount created with fuse2, and I am 90% sure that's the case...looking

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quick only compile tested function to do the dynamic probing

fn get_fusermount_path() -> Result<Utf8PathBuf> {
    let path = std::env::var("PATH").expect("PATH set");
    let fusermount_binaries = ["fusermount", "fusermount3"];
    for elt in path.split(':').map(Utf8Path::new) {
        for bin in fusermount_binaries {
            let target = elt.join(bin);
            if target.try_exists()? {
                return Ok(target);
            }
        }
    }
    anyhow::bail!("No fusermount path found")
}

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Cool, I'll update the PR then and drop the build conditional.

@jmarrero jmarrero changed the title WIP: Build conditional WIP: rust/src/bwrap.rs: check for fuse version Aug 30, 2024
HuijingHei
HuijingHei approved these changes Aug 30, 2024
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LGTM, need to fix the minor codestyle error.

@jmarrero @cgwalters
rust/src/bwrap.rs: check for fuse version
5641308 
We have been building with fuse but changed to fuse3  on:
https://src.fedoraproject.org/rpms/rpm-ostree/c/3c602a23787fd2df873c0b18df3133c9fec4b66a
However our code is just calling fuse's fusermount.
We are updating our spec and code based on the discusion on:
coreos#5047

Co-authored-by: Colin Walters <[email protected]>
@jmarrero jmarrero marked this pull request as ready for review August 30, 2024 13:23
@jmarrero jmarrero changed the title WIP: rust/src/bwrap.rs: check for fuse version rust/src/bwrap.rs: check for fuse version Aug 30, 2024
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@jmarrero: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

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ci/prow/fcos-e2e 5641308 link true /test fcos-e2e

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This was referenced Sep 2, 2024
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cgwalters
cgwalters approved these changes Sep 3, 2024
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rust/src/bwrap.rs
@@ -122,7 +138,7 @@ impl Drop for RoFilesMount {
return;
};
// We need to unmount before letting the tempdir cleanup run.
let success = Command::new("fusermount")
let success = Command::new(get_fusermount_path().unwrap().to_string())
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We could factor this out into a helper that we run once at startup, that would help us avoid the unwrap() but I'm fine with this as is too

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let's see if this fixes CI with the spec patch and I'll do a follow up with the startup part?

I guess it would go here

rpm-ostree/rust/src/daemon.rs

Line 25 in cd6fd88

/// Validate basic assumptions on daemon startup.
?

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I think we need to roll this PR together with #5047 to get the FCOS CI to work

@jmarrero
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jmarrero commented Sep 3, 2024

This now is incorporated into #5047

@jmarrero jmarrero closed this Sep 3, 2024
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@cgwalters cgwalters cgwalters approved these changes

@HuijingHei HuijingHei HuijingHei approved these changes

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@jmarrero @cgwalters @HuijingHei