Dotnet 5 SDK extension

How to use

You need to add following lines to flatpak manifest:

"sdk-extensions": [
    "org.freedesktop.Sdk.Extension.dotnet5"
],
"build-options": {
    "append-path": "/usr/lib/sdk/dotnet5/bin",
    "append-ld-library-path": "/usr/lib/sdk/dotnet5/lib",
    "env": {
        "PKG_CONFIG_PATH": "/app/lib/pkgconfig:/app/share/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig:/usr/lib/sdk/dotnet5/lib/pkgconfig"
    }
},

Scripts

install.sh - copies dotnet runtime to package.
install-sdk.sh - copies dotnet SDK to package.

Publishing project

"build-commands": [
    "install.sh",
    "dotnet publish -c Release YourProject.csproj",
    "cp -r --remove-destination /run/build/YourProject/bin/Release/net5.0/publish/ /app/bin/",
]

Using nuget packages

If you want to use nuget packages it is recommended to use the Flatpak .NET Generator tool. It generates sources file that can be included in manifest.

"build-commands": [
    "install.sh",
    "dotnet publish -c Release --source ./nuget-sources YourProject.csproj",
    "cp -r --remove-destination /run/build/YourProject/bin/Release/net5.0/publish/ /app/bin/"
],
"sources": [
    "sources.json",
    "..."
]

Publishing self contained app and trimmed binaries

Dotnet 5 gives option to include runtime in published application and trim their binaries. This allows you to significantly reduce the size of the package and get rid of /usr/lib/sdk/dotnet5/bin/install.sh.

First you need to have following lines in sources.json. These packages are needed to build a project for specific runtime.

{
    "type": "file",
    "url": "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.linux-arm/5.0.10/microsoft.aspnetcore.app.runtime.linux-arm.5.0.10.nupkg",
    "sha512": "5c3275b20fbd7e522449dc477b6fe521e6e8ca4998e990ed168cbafce4fe42eeb80869ee890d74c346b28d3230ddb11b25145064026796c2633f0ba3af1653dd",
    "dest": "nuget-sources",
    "dest-filename": "microsoft.aspnetcore.app.runtime.linux-arm.5.0.10.nupkg"
},
{
    "type": "file",
    "url": "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.linux-arm64/5.0.10/microsoft.aspnetcore.app.runtime.linux-arm64.5.0.10.nupkg",
    "sha512": "bacd5281f13d0a5b3684ca639199183a4873bf884de8e4c1ebf86176fcdb2bbd730314e989abbdab6126713dccd964e17e72366423f8e519bf4333188de099ff",
    "dest": "nuget-sources",
    "dest-filename": "microsoft.aspnetcore.app.runtime.linux-arm64.5.0.10.nupkg"
},
{
    "type": "file",
    "url": "https://api.nuget.org/v3-flatcontainer/microsoft.aspnetcore.app.runtime.linux-x64/5.0.10/microsoft.aspnetcore.app.runtime.linux-x64.5.0.10.nupkg",
    "sha512": "2c3d3d66909a10bc7183446a3b0fcdf2ccc6d3a1b99a0884780e37b75e82fb612214bee81ddabaebf93dc9e663775202b1829f24e582e96820e033ad0dae6457",
    "dest": "nuget-sources",
    "dest-filename": "microsoft.aspnetcore.app.runtime.linux-x64.5.0.10.nupkg"
},
{
    "type": "file",
    "url": "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.linux-arm/5.0.10/microsoft.netcore.app.runtime.linux-arm.5.0.10.nupkg",
    "sha512": "6e353aac1bde0ef33c4988cc3fba1aafe618c158ae7d1ab6535d45cfa833ffd1485d249ec465e836085b62838773d02be346c07ad5e23745721f885c4dcdb857",
    "dest": "nuget-sources",
    "dest-filename": "microsoft.netcore.app.runtime.linux-arm.5.0.10.nupkg"
},
{
    "type": "file",
    "url": "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.linux-arm64/5.0.10/microsoft.netcore.app.runtime.linux-arm64.5.0.10.nupkg",
    "sha512": "02f1d49490a930021f0b54f170619f7e2c1e3f7da6d9d18650595d4d46f13cdf79bddf283a2faa22a958c229a3f8bf36de75f4fd8c1acfb8665da220c286aed0",
    "dest": "nuget-sources",
    "dest-filename": "microsoft.netcore.app.runtime.linux-arm64.5.0.10.nupkg"
},
{
    "type": "file",
    "url": "https://api.nuget.org/v3-flatcontainer/microsoft.netcore.app.runtime.linux-x64/5.0.10/microsoft.netcore.app.runtime.linux-x64.5.0.10.nupkg",
    "sha512": "a4b2c15cd9e5bc6baf97cb71b0de54daf72aee2bf561a69120a25bf6d762e9b81cefaa925e6aecffb8f88c01cc68c1594e79d656768c6705bdc2d273cb58ef48",
    "dest": "nuget-sources",
    "dest-filename": "microsoft.netcore.app.runtime.linux-x64.5.0.10.nupkg"
},

Then add build options:

"build-options": {
    "arch": {
        "arm": {
            "env" : {
                "RUNTIME": "linux-arm"
            }
        },
        "aarch64": {
            "env" : {
                "RUNTIME": "linux-arm64"
            }
        },
        "x86_64": {
            "env" : {
                "RUNTIME": "linux-x64"
            }
        }
    }
},
"build-commands": [
    "mkdir -p /app/bin",
    "dotnet publish -c Release --source ./nuget-sources YourProject.csproj --runtime $RUNTIME --self-contained true",
    "cp -r --remove-destination /run/build/YourProject/bin/Release/net5.0/$RUNTIME/publish/* /app/bin/",
],