Why Use `go mod vendor` for Offline Go Builds and Dependency Management?

Purpose of the go mod vendor Command

Go modules manage dependency versioning, but they do not guarantee module availability or account for limited internet connectivity. Consequently, the go mod vendor command serves several critical purposes:

Mitigate Disappearing Modules

Despite the efforts of Go proxy, some modules may vanish from the internet, rendering code unbuildable. go mod vendor creates a local copy of all required packages, ensuring that builds can proceed even if modules become inaccessible.

Address Internet Restrictions

In environments with limited or unreliable internet access, such as large server farms, downloading dependencies from the internet can be inefficient. go mod vendor allows you to create an internal vendor repository and distribute it across multiple machines, eliminating the need for repeated downloads.

Usage Scenario

The go mod vendor command is particularly beneficial in the following scenarios:

• Ensuring build stability regardless of module availability
• Improving efficiency in environments with restricted internet access
• Maintaining control over dependencies within internal networks

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