func downloadFileWithChecksum(url string, destPath string) {
fileName := filepath.Base(destPath)
tmpPath := filepath.Join(dvmDir, ".tmp", fileName)
downloadFile(url, tmpPath)
checksumURL := url + ".sha256"
checksumPath := filepath.Join(dvmDir, ".tmp", (fileName + ".sh256"))
downloadFile(checksumURL, checksumPath)
checksum.CompareChecksum(tmpPath, checksumPath)
isValid, err := checksum.CompareChecksum(tmpPath, checksumPath)
if err != nil {
die("Unable to calculate checksum of %s.", err, retCodeRuntimeError, tmpPath)
}
if !isValid {
die("The checksum of %s failed to match %s.", nil, retCodeRuntimeError, tmpPath, checksumPath)
}
// Copy to final location, if different
if destPath != tmpPath {
ensureParentDirectoryExists(destPath)
err = os.Rename(tmpPath, destPath)
if err != nil {
die("Unable to copy %s to %s.", err, retCodeRuntimeError, tmpPath, destPath)
}
}
// Cleanup temp files
if err = os.Remove(checksumPath); err != nil {
writeWarning("Unable to remove temporary file: %s.", checksumPath)
}
}
func install(version string) {
if version == "" {
version = getDockerVersionVar()
}
if version == "" {
die("The install command requires that a version is specified or the DOCKER_VERSION environment variable is set.", nil, retCodeInvalidArgument)
}
if !versionExists(version) {
die("Version %s not found - try `dvm ls-remote` to browse available versions.", nil, retCodeInvalidOperation, version)
}
versionDir := getVersionDir(version)
if version == "experimental" && pathExists(versionDir) {
// Always install latest of experimental build
err := os.RemoveAll(versionDir)
if err != nil {
die("Unable to remove experimental version at %s.", err, retCodeRuntimeError, versionDir)
}
}
if _, err := os.Stat(versionDir); err == nil {
writeWarning("%s is already installed", version)
use(version)
return
}
writeInfo("Installing %s...", version)
// Download to a temporary location
url := buildDownloadURL(version)
tmpPath := filepath.Join(getDvmDir(), ".tmp/docker", version, getBinaryName())
downloadFile(url, tmpPath)
// Download Checksum to verify the binary
checksumURL := url + ".sha256"
checksumPath := tmpPath + ".sha256"
downloadFile(checksumURL, checksumPath)
// Verify checksum
isValid, err := checksum.CompareChecksum(tmpPath, checksumPath)
if err != nil {
die("Unable to calculate checksum of %s.", err, retCodeRuntimeError, tmpPath)
}
if !isValid {
die("The checksum of %s failed to match %s.", nil, retCodeRuntimeError, tmpPath, checksumPath)
}
// Copy to final location
binaryPath := filepath.Join(getDvmDir(), "bin/docker", version, getBinaryName())
ensureParentDirectoryExists(binaryPath)
err = os.Rename(tmpPath, binaryPath)
if err != nil {
die("Unable to copy %s to %s.", err, retCodeRuntimeError, tmpPath, binaryPath)
}
// Cleanup temp files
tmpDir := filepath.Dir(tmpPath)
writeDebug("Cleaning up temporary installation files in %s.", tmpDir)
if err = os.RemoveAll(tmpDir); err != nil {
writeWarning("Unable to remove temporary files in %s.", tmpDir)
}
writeDebug("Installed Docker %s to %s.", version, binaryPath)
use(version)
}