release binaries not working on alpine linux

[tipruzs]

Hi,

i was trying to create a pipeline based on k0sctl and alpine docker image, but noticed this is not working:

docker run -it --rm -w /tmp alpine:3.14
/tmp # wget -q https://github.com/k0sproject/k0sctl/releases/download/v0.11.4/k0sctl-linux-x64
/tmp # chmod +x k0sctl-linux-x64
/tmp # ./k0sctl-linux-x64 --help
sh: ./k0sctl-linux-x64: not found

A short investigation of the binary shows glibc dependencies, which should not be there.

/tmp # ldd k0sctl-linux-x64 
	/lib64/ld-linux-x86-64.so.2 (0x7f09af144000)
	libc.so.6 => /lib64/ld-linux-x86-64.so.2 (0x7f09af144000)
	libpthread.so.0 => /lib64/ld-linux-x86-64.so.2 (0x7f09af144000)
Error relocating k0sctl-linux-x64: __vfprintf_chk: symbol not found
Error relocating k0sctl-linux-x64: __fprintf_chk: symbol not found

There are already oher projects around dealing with this issue (influxdata/influxdb#5554)

My current workaround is using an alpine image with glibc (https://hub.docker.com/r/frolvlad/alpine-glibc/) but this should not be needed, if the issue can be fixed with a change in the build parameters of k0sctl.

Thanks in advance!

[kke]

Hmm, the buildflags are already BUILD_FLAGS = -trimpath -a -tags "netgo static_build" -installsuffix netgo -ldflags "$(LD_FLAGS) -extldflags '-static'"

[kke]

Looks like it needs osusergo in addition to netgo https://www.arp242.net/static-go.html