func getResolver() (*Resolver, error) {
resolver := NewResolver()
resolver.LibSources["git"] = &GitSCM{}
resolver.LibSources["archive"] = &ArchiveSCM{}
resolver.AddRewriteRules(BasicRewriteRules)
resolver.AddRewriteRules(GitRewriteRules)
resolver.AddRewriteRules(ArchiveRewriteRules)
// find/validate configuration file
if configFileName != "" {
if !Exists(configFileName) {
return nil, fmt.Errorf("could not locate config file: %s", configFileName)
}
} else {
// search in standard locations
for _, item := range configFilePath {
path, err := AbsolutePath(item)
if err != nil {
return nil, err
}
if Exists(path) {
configFileName = path
break
}
}
// warn and exit here if we can't locate on the search path
if configFileName == "" {
log.Warn("Could not locate .grapnelrc file; continuing.")
return resolver, nil
}
}
// load the rules from the config file
log.Debug("Loading %s", configFileName)
if rules, err := LoadRewriteRules(configFileName); err != nil {
return nil, err
} else {
resolver.AddRewriteRules(rules)
}
return resolver, nil
}
func (self *GitSCM) Resolve(dep *Dependency) (*Library, error) {
lib := NewLibrary(dep)
// fix the tag, and default branch
if lib.Branch == "" {
lib.Branch = "master"
}
if lib.Tag == "" {
lib.Tag = "HEAD"
}
log.Info("Fetching Git Dependency: '%s'", lib.Import)
// create a dedicated directory and a context for commands
tempRoot, err := ioutil.TempDir("", "")
if err != nil {
return nil, err
}
lib.TempDir = tempRoot
cmd := NewRunContext(tempRoot)
// use the configured url and acquire the depified branch
log.Info("Fetching remote data for %s", lib.Import)
if lib.Url == nil {
// try all supported protocols against a URL composed from the import
for _, protocol := range []string{"http", "https", "git", "ssh"} {
packageUrl := protocol + "://" + lib.Import
log.Warn("Synthesizing url from import: '%s'", packageUrl)
if err := cmd.Run("git", "clone", packageUrl, "-b", lib.Branch, tempRoot); err != nil {
log.Warn("Failed to fetch: '%s'", packageUrl)
continue
}
lib.Url, _ = url.Parse(packageUrl) // pin URL
break
}
if err != nil {
return nil, fmt.Errorf("Cannot download dependency: '%s'", lib.Import)
}
} else if err := cmd.Run("git", "clone", lib.Url.String(), "-b", lib.Branch, tempRoot); err != nil {
return nil, fmt.Errorf("Cannot download dependency: '%s'", lib.Url.String())
}
// move to the specified commit/tag/hash
// check out a depific commit - may be a tag, commit hash or HEAD
if err := cmd.Run("git", "checkout", lib.Tag); err != nil {
return nil, fmt.Errorf("Failed to checkout tag: '%s'", lib.Tag)
}
// Pin the Tag to a commit hash if we just have "HEAD" as the 'Tag'
if lib.Tag == "HEAD" {
if err := cmd.Run("git", "rev-list", "--all", "--max-count=1"); err != nil {
return nil, fmt.Errorf("Failed to checkout tag: '%s'", lib.Tag)
} else {
lib.Tag = strings.TrimSpace(cmd.CombinedOutput)
}
}
// Stop now if we have no semantic version information
if lib.VersionSpec.IsUnversioned() {
lib.Version = NewVersion(-1, -1, -1)
log.Warn("Resolved: %v (unversioned)", lib.Import)
stripGitRepo(lib.TempDir)
return lib, nil
}
// find latest version match
if err := cmd.Run("git", "for-each-ref", "refs/tags", "--sort=taggerdate",
"--format=%(refname:short)"); err != nil {
return nil, fmt.Errorf("Failed to acquire ref list for depenency")
} else {
for _, line := range strings.Split(cmd.CombinedOutput, "\n") {
log.Debug("%v", line)
if ver, err := ParseVersion(line); err == nil {
log.Debug("ver: %v", ver)
if dep.VersionSpec.IsSatisfiedBy(ver) {
lib.Tag = line
lib.Version = ver
// move to this tag in the history
if err := cmd.Run("git", "checkout", lib.Tag); err != nil {
return nil, fmt.Errorf("Failed to checkout tag: '%s'", lib.Tag)
}
break
}
} else {
log.Debug("Parse git tag err: %v", err)
}
}
}
// fail if the tag cannot be determined.
if lib.Version == nil {
return nil, fmt.Errorf("Cannot find a tag for dependency version specification: %v.", lib.VersionSpec)
}
log.Info("Resolved: %s %v", lib.Import, lib.Version)
stripGitRepo(lib.TempDir)
return lib, nil
}
func (self *ArchiveSCM) Resolve(dep *Dependency) (*Library, error) {
lib := NewLibrary(dep)
// create a dedicated directory and a context for commands
tempRoot, err := ioutil.TempDir("", "")
if err != nil {
return nil, err
}
lib.TempDir = tempRoot
cmd := NewRunContext(tempRoot)
// prep archive file for write
filename := filepath.Join(tempRoot, filepath.Base(lib.Dependency.Url.Path))
file, err := os.OpenFile(filename, os.O_CREATE, 0)
if err != nil {
return nil, fmt.Errorf("Cannot open archive for writing: %v", err)
}
defer file.Close()
// get the targeted archive
response, err := http.Get(lib.Dependency.Url.String())
if err != nil {
return nil, fmt.Errorf("Cannot download archive: %v", err)
}
if err := response.Write(file); err != nil {
return nil, fmt.Errorf("Cannot write archive: %v", err)
}
file.Close()
log.Info("Wrote: %s", filename)
// extract the file
// TODO: change to using built-in libraries whenever possible.
switch filepath.Ext(filename) {
case "zip":
cmd.Run("unzip", filename)
case "tar.gz":
cmd.Run("tar", "xzf", filename)
case "tar":
cmd.Run("tar", "xf", filename)
}
os.Remove(filename)
// Stop now if we have no semantic version information
if lib.VersionSpec.IsUnversioned() {
lib.Version = NewVersion(-1, -1, -1)
log.Warn("Resolved: %v (unversioned)", lib.Import)
return lib, nil
}
// get the version number from the filename
if ver, err := ParseVersion(filepath.Base(filename)); err == nil {
log.Debug("ver: %v", ver)
if dep.VersionSpec.IsSatisfiedBy(ver) {
lib.Version = ver
}
} else {
log.Debug("Parse archive version err: %v", err)
}
// fail if the tag cannot be determined.
if lib.Version == nil {
return nil, fmt.Errorf("Cannot find a version specification on archive: %v.", lib.VersionSpec)
}
log.Info("Resolved: %s %v", lib.Import, lib.Version)
return lib, nil
}