I'm trying to play around with the lightning network. I have cloned the repo, and on disk placed it here (I'm using windows):
C:\Users\hallibut\Documents\GitHub\lnd
I'd like to run any of the tests in itest, lets say testMultiHopPayments. The cli commands I'm using after I cd into the above location is:
go test itest -run testMultiHopPayments
However, I keep getting the error:
package itest is not in GOROOT (C:\Program Files\Go\src\itest)
I've read through the various posts on this error, but I'm still not quite sure why it happens, and it's likely because I don't fully understand the go module (I'm new to go). This article, was probably the best in helping me understand the structure and env variables:
https://golangbyexample.com/workspace-hello-world-golang/
My understanding from the various readings is that whatever directory the go.mod file is in, indicates the module level directory. Prior to version 1.13 there was a required directory and structure, but now that should not be an issue if you're using at least version 1.13 and modules. I'm using 1.17.1. This is somewhat of an assumption or inference, but I believe everything lower in the directory structure is part of a package to be installed as part of the module (and is defined by the package keyword). However, I don't understand why a package with source code within a subdirectory would be missing/throw the aforementioned error. I've also tried running:
go mod install github.com/lightningnetwork/lnd/lntest/itest
That doesn't seem to do anything/has not effect on the error. What am I not understanding about packages? Looking at the go.mod file I observe that itest is not specifically defined anywhere… Not sure if that's required. Also, I assume I've got to run some build process prior? I attempted this with:
go install -v ./...
If you're using VS Code and Go Modules, you need to "Open folder" and point to the cloned repo, to get around that error
Related
I am trying to learn how to build a webserver using go and mux. I am importing mux to the main.go file as import github.com/gorilla/mux. However, when I am trying to run the code. I get the following error
no required module provides package github.com/gorilla/mux: go.mod file not found in current directory or any parent directory; see 'go help modules'
My GOPATH is /Users/michiokaku/Study/go
The overall structure of my directories is
go___
pkg
bin
my_codes___
main.go
Inside pkg, I found a directory named mux#v1.8.0 in the path pkg/mod/github.com/gorilla. I think this is what I downloaded using go get -u github.com/gorilla/mux. But when the code is running, I am getting errors.
What is the issue here? How do I solve this?
PS: I am using mac.
Read through Tutorial: Getting Started with Go, if you haven't seen it already. It matches your situation pretty closely.
In short:
Run go mod init example.com/projectname, replacing the last argument with the name for your module. This will create a go.mod file in the current directory that will track your dependencies. Your module's name will be a prefix for all packages within your module.
Run go mod tidy or go get github.com/gorilla/mux to add github.com/gorilla/mux as a dependency.
You mentioned you saw a directory pkg/mod/github.com/gorilla earlier. This is part of Go's module cache, shared by all projects.
I'm writing this away from my code so fingers crossed.
I've recently started learning Go from a Python background. I've set up my workspace (Linux Mint OS) so:
GOPATH=$HOME/go
GOROOT=/usr/local/go
Where under $HOME i have a dir called go and 3 subdirs called src, bin and pkg.
I wanted to mess around with some dataframes (I use pandas a lot in Python) so I tried to install gota from github. Only their recommended install command:
go get -u github.com/kniren/gota/dataframe
go get -u github.com/kniren/gota/series
returns an error saying it could find the package in GOPATH or GOROOT. To me this is strange as go get seems like the equivalent to pip install and shouldn't be looking in my path but rather at the URL. I managed to get some files to install but using goget and the github URL of the project:
go get github.com/go-gota/gota/dataframe
go get github.com/go-gota/gota/series
and this built some files under a gonum.org directory in my src dir and a linux_amd64 dir in my pkg directory. So far neither section have the expected path to the libraries and I can't find a suitable method to import. import statements look in gopath's src directory however I assume it should be looking in the pkg directory? Why is this and what's wrong with my env?
The authors of the repository must have migrated to a different repository.
The official repository of these packages is: github.com/go-gota/gota
https://www.github.com/kniren/gota/dataframe
https://www.github.com/kniren/gota/series
These repositories do not exist, this is why your go get commands failed. In fact, trying to navigate to github.com/kniren/gota redirects me to their official repository.
Im new to go and I have been unable to find any thing online for my issue.
I have downloaded this code https://github.com/hashicorp/http-echo and I would like to set it up so I can run this command.
$ http-echo -listen=:8080 -text="hello world"
I have been getting quite a few different path issues.
Currently I have the code sitting in this directory.
/Users/jon/go/src/github.com/hashicorp
When I try and install it I get this error
$ go install http-echo
can't load package: /usr/local/go/src/http-echo/handlers.go:9:2: non-standard import "github.com/hashicorp/http-echo/version" in standard package "http-echo"
Where should I keep go projects on an OSX computer, and how do I get this to install or compile?
The code currently seems to be in /usr/local/go/src/http-echo. Packages should always reside in the directory $GOPATH/src/package-name, e.g.: $GOPATH/src/github.com/hashicorp/http-echo. (unless you're using go modules).
It should work if you move the source to the correct path (/Users/jon/go/src/github.com/hashicorp/http-echo). Then execute:
go install github.com/hashicorp/http-echo
Even easier would be to use go get to download the package in the first place. Simply run the following command from any directory:
go get github.com/hashicorp/http-echo
And http-echo is automagically installed.
If you still get an error after this, make sure $GOPATH/bin is in your $PATH.
When I clone a project written in golang, it is normal that a lot of imports like
'github.com/XXXX' are missing. Is there any way to get these imports in batches by a command? or I am suppose to get them one by one.
You should use go get to get "remote" packages. Quoting from Command go: Download and install packages and dependencies
Get downloads the packages named by the import paths, along with their dependencies. It then installs the named packages, like 'go install'.
You may use the -v flag in all of the following commands, and so you will see what go get is doing under the hood.
You may use the -d flag if you just want to download the packages but you do not want to install them.
The examples use the example remote package github.com/somebody/somepackage, but obviously it works for other packages hosted outside of github.com.
For more information, see the official doc: Command go, or type go help get.
To get a single package with all the dependencies of that package and install them, use
go get github.com/somebody/somepackage
To get a package with all its dependencies, and all other packages rooted at that path (along with their dependencies), and install all of them, use:
go get github.com/somebody/somepackage/...
Quoting from Command go:
An import path is a pattern if it includes one or more "..." wildcards, each of which can match any string, including the empty string and strings containing slashes. Such a pattern expands to all package directories found in the GOPATH trees with names matching the patterns.
To get a package with all its dependencies (and "subpackages") including dependencies of tests, and install all of them, use:
go get -t github.com/somebody/somepackage/...
To update a package you already have, use:
go get -u github.com/somebody/somepackage/...
To fetch dependencies of a package you already have (which is not necessarily from a remote location):
go get path/to/package/name/...
Or go to its folder and then you may use a relative path:
go get ./...
A lot of golang projects now use dependency management so you should look for that first. e.g a Glide.lock (glide) or Gopkg.lock (dep - the way people are moving now) file present in the root of the project.
https://github.com/golang/dep
https://golang.github.io/dep
if dep is used and you have it installed then dep ensure will set the dependencies up for you and make sure you get the versions the author intended
if a project is not using dependency management you can just get the packages with go get ./... but I don't think you will be guaranteed the correct versions (e.g if the author was pinned to a version tag for a dep)
If you run dep init it sets up dep on a project and will attempt to resolve the correct versions, however this doesnt always work if the stars dont align (e.g I have seen issues with dependencies using gopkg.in)
try using go get ./... in root of your project
Im not very good with Go and I am having a lot of problems with understanding how common website features are made, so I thought it would be good to see a real example. I tried building https://github.com/golang/blog but its not working.
My gopath is apparently C:/Users/me/go as it should be.
*Edit Except if I run cd $GOPATH/src, it says C:\src doesnt exist, it looks in C: not C:/Users
Method 1. (running go get -u golang.org/x/blog)
I open Powershell and run that in my Users/me/go/src directory and it says:
can't load package: package golang.org: no Go files in
C:\Users\me\go\src\golang.org
But it does download the source files. So its basically this step?
'u can manually git clone the repository to $GOPATH/src/golang.org/x/blog.'
Then I dont know where to run go build or what to run. I tried
go build -o blog.exe ./blog
and it says
can't load package: package blog: cannot find package "blog" in any of:
C:\Go\src\blog (from $GOROOT)
C:\Users\me\go\src\blog (from $GOPATH)
I tried running the same command in different directories of the project and doesnt work.
I'll try to answer your questions. (Note that I am a Linux user, so there may be some discrepancies with the Windows commands below. You may want to follow these directions: http://www.wadewegner.com/2014/12/easy-go-programming-setup-for-windows/ to setup the GOROOT environment variable.)
For method 1, the -u flag tells go to update the source code. Since you haven't downloaded it before, it lets you know with the error you see. What you want to run is go get golang.org/x/blog.
To build the package, you first want to change the directory (cd) to the package root, so cd %GOPATH%\src\golang.org\x\blog or cd C:\Users\me\go\src\golang.org\x\blog. Next, you want to run go build. Then, you can run the output file, which should automatically be named blog.exe.
Hopefully this helps! :)