dotcloud/docker

package mod

import (
    "runtime/debug"
    "sync"

    "golang.org/x/mod/module"
    "golang.org/x/mod/semver"
)

var (
    buildInfoOnce sync.Once
    buildInfo     *debug.BuildInfo
)

func Version(name string) (modVersion string) {
    return moduleVersion(name, readBuildInfo())
}

func moduleVersion(name string, bi *debug.BuildInfo) (modVersion string) {
    if bi == nil {
        return
    }
    // iterate over all dependencies and find buildkit
    for _, dep := range bi.Deps {
        if dep.Path != name {
            continue
        }
        // get the version of buildkit dependency
        modVersion = dep.Version
        if dep.Replace != nil {
            // if the version is replaced, get the replaced version
            modVersion = dep.Replace.Version
        }
        if !module.IsPseudoVersion(modVersion) {
            return
        }
        // if the version is a pseudo version, get the base version
        // e.g. v0.10.7-0.20230306143919-70f2ad56d3e5 => v0.10.6
        if base, err := module.PseudoVersionBase(modVersion); err == nil && base != "" {
            // set canonical version of the base version (removes +incompatible suffix)
            // e.g. v2.1.2+incompatible => v2.1.2
            base = semver.Canonical(base)
            // if the version is a pseudo version, get the revision
            // e.g. v0.10.7-0.20230306143919-70f2ad56d3e5 => 70f2ad56d3e5
            if rev, err := module.PseudoVersionRev(modVersion); err == nil && rev != "" {
                // append the revision to the version
                // e.g. v0.10.7-0.20230306143919-70f2ad56d3e5 => v0.10.6+70f2ad56d3e5
                modVersion = base + "+" + rev
            } else {
                // if the revision is not available, use the base version
                modVersion = base
            }
        }
        break
    }
    return
}

func readBuildInfo() *debug.BuildInfo {
    buildInfoOnce.Do(func() {
        buildInfo, _ = debug.ReadBuildInfo()
    })
    return buildInfo
}