Golang News

Tip of the day: running Flagr Docker image on a M1 mac #docker #containers

Fri, 21 Oct 2022 15:53:00 +0000

Flagr is a Go-based feature flags service, which is by default deployed as a Docker image. However, the image is not built for darwin/arm64/8. Here is how to run the server without going through a source build. 1 points posted by FGM

What to do when Go itself will not run nor install from source

Thu, 10 May 2018 18:48:00 +0000

This morning it was time to consider deploying a project to production... but alas, programs which worked normally on an Ubuntu development workstation failed to run on the target server, running Debian. Both of them were running Linux kernels 3.2.x for x86_64, and the binary worked on one, but not the other:

ls -l myapp
-rwxrwxr-x 1 root root 3522952 Jun  6 11:32 myapp
$ ./myapp
bash: ./myapp: no such file or directory
$ strace -f -e open ./myapp
exec: no such file or directory
$ file myapp
ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
$ ldd myapp
ldd:
	not a dynamic executable

So, for "file", this is an dynamically linked executable, but not for ldd ? And, even more surprising, a trivial helloworld.go compiled the same way worked on both machines. What could be going wrong ? Anyway, let's just compile... but then the Go 1.0 package for Debian itself fails with the same symptoms. Let's find out how to fix this...

5 points posted by FGM

Goland tip of the day: when Make run configurations dont find "go" #goland

Sun, 14 Oct 2018 10:27:00 +0000

In a Goland 2018.3 EAP run configuration, a Makefile run configuration finds the go binary on macOS, but not on Ubuntu, causing lines tasks this one builds to fail:

client/test.wasm: client/main.go
	# Building WASM
	GOARCH=wasm GOOS=js go build -o client/test.wasm client/main.go

/usr/bin/make -f (some edited path)/Makefile client/test.wasm
/bin/sh: 1: go: not found
make: *** [client/test.wasm] Error 127

Let's fix it...

4 points posted by FGM

Go internals unofficial wiki restored

Mon, 04 Mar 2019 11:14:00 +0000

The "Go internals unofficial wiki" used to be a valuable resource for developers interesting in the internal operation of the Go runtime, but disappeared when wikispot.org went down in 04/2014.

It is now available in wiki form again on the Golang section on the Audean wiki.

3 points posted by FGM

GoLand tip of the day: clean up leftover cache and log folders #goland

Sat, 08 Dec 2018 17:26:00 +0000

When GoLand is upgraded from one version to the next, the deployment process adds a new set of configuration, cache, and log directories. But it does not remove the versions associated to the previous versions of the IDE, to ease rolling back to the previous version if an upgrade happens to cause an issue.

So after some time, removing these now-unused folders will regain some disk space, possibly more than 1 GB. Here are their respective locations and content on macOS...

2 points posted by FGM

Tip of the day: running tests for all subpackages recursively #tests

Thu, 29 Nov 2018 10:13:00 +0000

If you program in Go, you've probably written a lot of packages, and probably split packages in subpackages. Maybe even more than idiomatic Go would really advise... And you may have been grumbling just like I did at the fact that the go test command requires a list of packages, and does not recursively dive into all the subpackages, like PHPunit would, and does not seem to have a working recursion flag... 2 points posted by FGM