runtime is missing in global location

Describe the bug

After installing httprepl, running $httprepl or $dotnet httprepl is failing.

To Reproduce

Install dotnet via brew and httprepl via $dotnet tool install -g Microsoft.dotnet-httprepl. Try running httprepl as described above.

Exceptions (if any)

$httprepl 
A fatal error occurred. The required library libhostfxr.dylib could not be found.
If this is a self-contained application, that library should exist in [/Users/user/.dotnet/tools/.store/microsoft.dotnet-httprepl/6.0.0/microsoft.dotnet-httprepl/6.0.0/tools/net6.0/any/].
If this is a framework-dependent application, install the runtime in the global location [/usr/local/share/dotnet] or use the DOTNET_ROOT environment variable to specify the runtime location or register the runtime location in [/etc/dotnet].

The .NET runtime can be found at:
  - https://aka.ms/dotnet-core-applaunch?missing_runtime=true&arch=x64&rid=osx.12-x64&apphost_version=6.0.4
  - 
$dotnet httprepl
Could not execute because the specified command or file was not found.
Possible reasons for this include:
  * You misspelled a built-in dotnet command.
  * You intended to execute a .NET program, but dotnet-httprepl does not exist.
  * You intended to run a global tool, but a dotnet-prefixed executable with this name could not be found on the PATH.

$echo $PATH
/somevaild/.dotnet/tools /usr/local/bin /usr/bin /bin /usr/sbin /sbin /Library/TeX/texbin 

Further technical details

$dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.104
 Commit:    915d644e45

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  12.4
 OS Platform: Darwin
 RID:         osx.12-x64
 Base Path:   /usr/local/Cellar/dotnet/6.0.104_1/libexec/sdk/6.0.104/

Host (useful for support):
  Version: 6.0.4
  Commit:  be98e88c76

.NET SDKs installed:
  6.0.104 [/usr/local/Cellar/dotnet/6.0.104_1/libexec/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.4 [/usr/local/Cellar/dotnet/6.0.104_1/libexec/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.4 [/usr/local/Cellar/dotnet/6.0.104_1/libexec/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

[vitek-karas]

This feels like something didn’t work correctly in the brew install of .NET. Per the dotnet --info the install is located in /usr/local/Cellar/dotnet/6.0.104_1/libexec, but based on the errors it’s not registered. So apphost won’t be able to find it since it’s not on the default path nor is it registered.

I don’t have a mac at hand to try this - to verify that brew is not doing the right thing here. @joeloff could you please check on this? I assume we don’t own the brew .NET package, right?

A workaround is either:

• Manually register the install by putting the path to it into /etc/dotnet/install_location_x64 (that file should be a text file with just the path to the .NET install in it on the first line)
• Set DOTNET_ROOT environment variable to the path of the .NET install.

For those interested, details on how the install location works and what is used to find it are here: https://github.com/dotnet/designs/blob/main/accepted/2021/install-location-per-architecture.md

[GyroJoe]

The Formula mentions this, but you need to set DOTNET_ROOT properly: export DOTNET_ROOT="$HOMEBREW_PREFIX/opt/dotnet/libexec"

Here’s the hosts.txt output without this for completeness:

Tracing enabled @ Wed Mar  8 00:53:35 2023 UTC
--- Invoked apphost [version: 7.0.0, commit hash: d099f075e45d2aa6007a22b71b45a08758559f80] main = {
authcore
}
The managed DLL bound to this executable is: '.store/authenticatorcore/0.1.0-ci-20230308-004036/authenticatorcore/0.1.0-CI-20230308-004036/tools/net7.0/any/AuthenticatorCore.dll'
Looking for architecture-specific install_location file in '/etc/dotnet/install_location_arm64'.
Found registered install location '/usr/local/share/dotnet'.
Using global installation location [/usr/local/share/dotnet] as runtime location.
The required library libhostfxr.dylib could not be found. Searched with root path [/Users/joeflint/.dotnet/tools/.store/authenticatorcore/0.1.0-ci-20230308-004036/authenticatorcore/0.1.0-ci-20230308-004036/tools/net7.0/any/], environment variable [DOTNET_ROOT], default install location [/usr/local/share/dotnet], self-registered config location [/etc/dotnet/install_location_arm64]
You must install .NET to run this application.

App: /Users/joeflint/.dotnet/tools/authcore
Architecture: arm64
App host version: 7.0.0
.NET location: Not found

Learn about runtime installation:
https://aka.ms/dotnet/app-launch-failed

Download the .NET runtime:
https://aka.ms/dotnet-core-applaunch?missing_runtime=true&arch=arm64&rid=osx.13-arm64&apphost_version=7.0.0