DLPX-93311 24.04 LTS upgrade: kernel builds continue to fail due to rustc conflict

[palash-gandhi]

Problem

#21 failed to resolve a dependency conflict that was seen while building the kernel packages on 24.04. The latest build failures still show the same conflict:

19:58:06  Starting 2 pkgProblemResolver with broken count: 1
19:58:06  Investigating (0) delphix-rust:amd64 < 1.80.0-1delphix.2025.01.31.14.59 @ii K Ib >
19:58:06  Broken delphix-rust:amd64 Conflicts on rustc:amd64 < none -> 1.75.0+dfsg0ubuntu1-0ubuntu7.1 @un uN >
19:58:06    Considering rustc:amd64 -1 as a solution to delphix-rust:amd64 1
19:58:06    Added rustc:amd64 to the remove list
19:58:06    Conflicts//Breaks against version 1.75.0+dfsg0ubuntu1-0ubuntu7 for rustc but that is not InstVer, ignoring
19:58:06    Conflicts//Breaks against version 1.74.1+dfsg0ubuntu1-0ubuntu13 for rustc-1.74 but that is not InstVer, ignoring
19:58:06    Fixing delphix-rust:amd64 via keep of rustc:amd64
19:58:06  Investigating (0) bindgen-0.65:amd64 < none -> 0.65.1+dfsg0-0ubuntu1 @un uN Ib >
19:58:06  Broken bindgen-0.65:amd64 Depends on rustc:amd64 < none | 1.75.0+dfsg0ubuntu1-0ubuntu7.1 @un uH > (>= 1.72.0+dfsg)
19:58:06    Considering rustc:amd64 -1 as a solution to bindgen-0.65:amd64 0
19:58:06    Holding Back bindgen-0.65:amd64 rather than change rustc:amd64
19:58:06  Investigating (0) linux-build-deps:amd64 < 6.8.0-47.47 @iU K Nb Ib >
19:58:06  Broken linux-build-deps:amd64 Depends on bindgen-0.65:amd64 < none | 0.65.1+dfsg0-0ubuntu1 @un uH >
19:58:06    Considering bindgen-0.65:amd64 0 as a solution to linux-build-deps:amd64 -2
19:58:06    Removing linux-build-deps:amd64 rather than change bindgen-0.65:amd64
19:58:06  Done

I believe the problem here is that the version of the rustc package is not specified by our delphix-rust virtual package based on this line:

19:58:06  Investigating (0) delphix-rust:amd64 < 1.80.0-1delphix.2025.01.31.14.59 @ii K Ib >
19:58:06  Broken delphix-rust:amd64 Conflicts on rustc:amd64 < none -> 1.75.0+dfsg0ubuntu1-0ubuntu7.1 @un uN >

I believe the problem is:

• bindgen-0.65 requires rustc (>= 1.72.0+dfsg)
• Our delphix-rust's Provides: rustc doesn't specify a version
• Without a version in the Provides: field, apt doesn't know if delphix-rust satisfies the version requirement (hence the none)
• So apt tries to install a version of rustc to satisfy bindgen-0.65's requirement of rustc (>= 1.72.0+dfsg),. The Ubuntu repos host version 1.75
• But that in turn conflicts with our delphix-rust.

Solution

To solve this, I would like to try and specify a version of the rustc and set it to be equal to the version of delphix-rust itself so that the dependency resolver can perform version comparisons and not install rustc from other sources.

Testing

https://ops-jenkins.eng-tools-prd.aws.delphixcloud.com/job/linux-pkg/job/os-upgrade/job/build-package/job/delphix-rust/job/pre-push/65/console

delphix@ip-10-110-197-95:~$ aws s3 cp s3://dev-de-images/builds/jenkins-ops/linux-pkg/os-upgrade/build-package/delphix-rust/pre-push/65/delphix-rust_1.80.0-1delphix.2025.02.06.19.05_amd64.deb .
download: s3://dev-de-images/builds/jenkins-ops/linux-pkg/os-upgrade/build-package/delphix-rust/pre-push/65/delphix-rust_1.80.0-1delphix.2025.02.06.19.05_amd64.deb to ./delphix-rust_1.80.0-1delphix.2025.02.06.19.05_amd64.deb

delphix@ip-10-110-197-95:~$ dpkg-deb -R delphix-rust_1.80.0-1delphix.2025.02.06.19.05_amd64.deb tmp

delphix@ip-10-110-197-95:~$ grep Provides tmp/DEBIAN/control
Provides: cargo, rust-gdb, rustc (= 1.80.0-1delphix.2025.02.06.19.05)

More testing can only be done after a buildserver with these changes is built & imported.

[prakashsurya]

I'm not super familiar with the debian format, but this seems reasonable.. should all the provides include the version? (assuming as-is is only for rustc)