Which OS-dependencies does a self-contained app need?

[alexandrehtrb]

Hello,

Let's say I have compiled a .NET app for Linux, with self-contained deployment enabled. Which package dependencies does it need to run?

For example, .NET 9 runtime for Ubuntu lists the following required dependencies:

• dotnet-hostfxr-9.0
• libbrotli1 (>= 0.6.0)
• libc6 (>= 2.38)
• libgcc-s1 (>= 3.0) [not s390x]
• libgcc-s1 (>= 3.3) [s390x]
• libicu76
• liblttng-ust1t64 (>= 2.13.0) [amd64, arm64]
• libssl3t64 (>= 3.3.0)
• libstdc++6 (>= 13.1)
• libunwind8 [amd64]
• zlib1g (>= 1:1.1.4)

Are all of those dependencies required for execution, considering .NET runtime is not installed on the machine?

Also, the same question above, but for NativeAOT publishing.

[huoyaoyuan]

hostfxr is for framework-dependent to resolve the framework. It should not be required for self-contained.
libc/libgcc/libstdc++/libunwind is required for the base CLR runtime. NativeAOT should have got rid of libstdc++, but the others are required.
liblttng should be required if you are not disabling eventing and diagnosing.
libicu is required if you are not setting globalization invariant mode.
brotli/ssl/zlib is only required if you are using corresponding or cryptography feature. Note that cryptography is implicitly used by many components.

[alexandrehtrb]

Can you explain more about liblttng?

[huoyaoyuan]

It seems that lttng is optional. It will be skipped if disabled in environment variable, or fails to load.

runtime/src/coreclr/pal/src/misc/tracepointprovider.cpp

Line 68 in c8403e6

CLRConfigNoCache cfgLTTng = CLRConfigNoCache::Get("LTTng", /*noprefix*/ false, &getenv);

I haven't tested it though.