How to handle different dependency names on differing distros?

[dmulder]

I'm trying to build RPMs for SUSE and Rocky, but the dependency names for some packages aren't the same. How am I supposed to handle this?

[cat-in-136]

See https://github.com/cat-in-136/cargo-generate-rpm#overwrite-configuration

As same as the original rpm, it is frequently possible to avoid explicitly specifying a dependent package names with automatic dependency resolution or so library names.

If not, use the configuration overwrite.

[dmulder]

Ok, the documentation is vague on details, and everything I've tried doesn't actually work.
My problem is that I'm supplying an ssh configuration file, then adding a dependency on sshd (sshd in EL distros, openssh-server on SUSE distros).

My Cargo.toml looks like this:

[package]
name = "sshd-config"
description = "Himmelblau Required SSHD Configuration"
version.workspace = true
authors.workspace = true
rust-version.workspace = true
edition.workspace = true
license.workspace = true
homepage.workspace = true
repository.workspace = true

[lib]
path = "src/lib.rs"

[package.metadata.deb]
name = "himmelblau-sshd-config"
depends = ["openssh-server"]
assets = [
  ["../../platform/debian/sshd_config", "etc/ssh/sshd_config.d/himmelblau.conf", "644"],
]

[package.metadata.generate-rpm]
name = "himmelblau-sshd-config"
assets = [
  { source = "../../platform/el/sshd_config", dest = "/etc/ssh/sshd_config.d/himmelblau.conf", mode = "644" },
]

[package.metadata.generate-rpm.requires]
sshd = "*"

I've created a separate toml file for modifying the requires:

[package.metadata.generate-rpm.requires]
openssh-server = "*"

Then my build commands:
For EL:
cargo generate-rpm -p src/sshd-config
For SUSE:
cargo generate-rpm -p src/sshd-config --metadata-overwrite=src/sshd-config/openSUSEDepends.toml#package.metadata.generate-rpm.requires

The results:

# rpm -qpR packaging/himmelblau-sshd-config-0.8.0-1.x86_64-tumbleweed.rpm
/bin/sh
sshd
rpmlib(CompressedFileNames) = 3.0.4-1
rpmlib(FileDigests) = 4.6.0-1
rpmlib(PayloadFilesHavePrefix) = 4.0-1
rpmlib(PayloadIsZstd) = 5.4.18-1
# rpm -qpR packaging/himmelblau-sshd-config-0.8.0-1.x86_64-rocky9.rpm 
/bin/sh
sshd
rpmlib(CompressedFileNames) = 3.0.4-1
rpmlib(FileDigests) = 4.6.0-1
rpmlib(PayloadFilesHavePrefix) = 4.0-1
rpmlib(PayloadIsZstd) = 5.4.18-1

Clearly the --metadata-overwrite option is being ignored, unless I've made some mistake, but the documentation never explains clearly what should be provided here. I tried providing a full toml file, with just the requires changed. I tried supplying just the line openssh-server = "*" with #package.metadata.generate-rpm.requires on the command line (this throws an error).

Nothing I have tried works as you describe.

[cat-in-136]

As written README, it simply overwrites package.metadata.generate-rpm (not ....requires). No implementation to take care the context of the change.

See as following:

$ cat Cargo.toml                                                                                                                    /tmp/foobar (master)
[package]
name = "foobar"
description = "foobar"
license = "MIT"
version = "0.1.0"
edition = "2021"

[dependencies]

[package.metadata.generate-rpm]
name = "foobarbaz"
assets = [
  { source = "target/release/foobar", dest = "/usr/bin/foobar", mode = "755" },
]

[package.metadata.generate-rpm.requires]
sshd = "*"

#[package.metadata.generate-rpm.variants.suse.requires]
#openssh-server = "*"

$ cat openSUSEDepends.toml
[package.metadata.generate-rpm.requires]
openssh-server = "*"

$ cargo generate-rpm ; rpm -qpR target/generate-rpm/foobarbaz-0.1.0-1.x86_64.rpm | grep ssh
sshd
$ cargo generate-rpm --metadata-overwrite=openSUSEDepends.toml#package.metadata.generate-rpm ; rpm -qpR target/generate-rpm/foobarbaz-0.1.0-1.x86_64.rpm | grep ssh 
openssh-server

metadata-overwrite is muddled because it comprehensively supports a variety of requirements. For simple patching, comment out the Cargo.toml of above example and cargo generate-rpm --variant suse is simple and short.