68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
package manifest
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import (
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"fmt"
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"net/http"
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"net/url"
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"os"
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"path"
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"path/filepath"
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"strings"
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)
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// "library" is the default "library directory"
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// returns the parsed version of (in order):
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// if "repo" is a URL, the remote contents of that URL
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// if "repo" is a relative path like "./repo", that file
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// the file "library/repo"
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// (repoName, tagName, man, err)
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func Fetch(library, repo string) (string, string, *Manifest2822, error) {
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repoName := path.Base(repo)
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tagName := ""
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if tagIndex := strings.IndexRune(repoName, ':'); tagIndex > 0 {
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tagName = repoName[tagIndex+1:]
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repoName = repoName[:tagIndex]
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repo = strings.TrimSuffix(repo, ":"+tagName)
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}
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u, err := url.Parse(repo)
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if err == nil && u.IsAbs() {
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// must be remote URL!
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resp, err := http.Get(repo)
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if err != nil {
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return repoName, tagName, nil, err
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}
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defer resp.Body.Close()
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man, err := Parse(resp.Body)
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if tagName != "" && man.GetTag(tagName) == nil {
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return repoName, tagName, man, fmt.Errorf("tag not found in manifest for %q: %q", repoName, tagName)
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}
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return repoName, tagName, man, err
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}
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// try file paths
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filePaths := []string{}
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if filepath.IsAbs(repo) || strings.IndexRune(repo, filepath.Separator) >= 0 || strings.IndexRune(repo, '/') >= 0 {
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filePaths = append(filePaths, repo)
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}
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if !filepath.IsAbs(repo) {
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filePaths = append(filePaths, filepath.Join(library, repo))
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}
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for _, fileName := range filePaths {
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f, err := os.Open(fileName)
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if err != nil && !os.IsNotExist(err) {
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return repoName, tagName, nil, err
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}
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if err == nil {
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defer f.Close()
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man, err := Parse(f)
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if tagName != "" && man.GetTag(tagName) == nil {
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return repoName, tagName, man, fmt.Errorf("tag not found in manifest for %q: %q", repoName, tagName)
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}
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return repoName, tagName, man, err
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}
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}
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return repoName, tagName, nil, fmt.Errorf("unable to find a manifest named %q (in %q or as a remote URL)", repo, library)
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}
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