Why Does \'go get\' Produce \'hg: executable file not found\' Error?

Troubleshooting "hg" Executable Not Found Error When Installing Remote Go Packages

When attempting to install remote Go packages using the go get command, users may encounter the error:

package code.google.com/p/go.example/hello: exec: "hg": executable file not found in %PATH%.

This error indicates that the Mercurial (hg) executable, required for cloning the package from its source control repository, is not present in the system's PATH environment variable.

To resolve this issue, follow these steps:

1. Install Mercurial: Install the Mercurial distributed version control system on your system. This can typically be done using the package manager of your operating system.
2. Configure PATH Variable: Add the Mercurial bin directory to the PATH environment variable so that the hg executable can be found by the system. For example, on Windows, open the Control Panel, navigate to System and Security > System, and click the "Edit environment variables for your account" button. Under System variables, add a new variable named PATH with the value including the path to the Mercurial bin directory.
3. Run go get Again: Retry the go get command to install the package. The clone command will now be able to locate the hg executable and complete the installation.

4. Check Installation: Verify that the package has been downloaded and installed by checking the following directories:

   • GOPATH/src/ The source code for the package will be located here.
   • GOPATH/bin/ The compiled binary for the package will be placed here.

By following these steps, you should be able to successfully install remote Go packages that are under Mercurial source control.

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