112 lines
2.8 KiB
Go
112 lines
2.8 KiB
Go
package main
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import (
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"io/fs"
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"os"
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"path/filepath"
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"strings"
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"github.com/go-git/go-git/v5/plumbing/format/gitignore"
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gha "github.com/sethvargo/go-githubactions"
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)
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func main() {
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ghCtx, err := gha.Context()
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if err != nil {
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gha.Fatalf("gha.Context error: %v", err)
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}
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workdir := gha.GetInput("workdir")
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if len(workdir) == 0 {
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workdir = ghCtx.Workspace
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}
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inputPatterns := gha.GetInput("patterns")
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gha.Infof("input patterns: %s", inputPatterns)
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matchedFiles, hashResult, err := hashFiles(workdir, strings.Split(inputPatterns, "\n"))
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if err != nil {
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gha.Fatalf("hashFiles error: %v", err)
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}
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gha.SetOutput("hash", hashResult)
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gha.Infof("computed hash: %s", hashResult)
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matchedFilesJSON, _ := json.Marshal(matchedFiles)
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gha.SetOutput("matched-files", string(matchedFilesJSON))
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gha.Infof("matched files: %s", matchedFilesJSON)
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}
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func hashFiles(workdir string, patterns []string) ([]string, string, error) {
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var ps []gitignore.Pattern
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const cwdPrefix = "." + string(filepath.Separator)
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const excludeCwdPrefix = "!" + cwdPrefix
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for _, p := range patterns {
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cleanPattern := strings.TrimSpace(p)
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if len(cleanPattern) == 0 {
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continue
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}
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if strings.HasPrefix(cleanPattern, cwdPrefix) {
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cleanPattern = cleanPattern[len(cwdPrefix):]
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} else if strings.HasPrefix(cleanPattern, excludeCwdPrefix) {
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cleanPattern = "!" + cleanPattern[len(excludeCwdPrefix):]
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}
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ps = append(ps, gitignore.ParsePattern(cleanPattern, nil))
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}
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matcher := gitignore.NewMatcher(ps)
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var files []string
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if err := filepath.Walk(workdir, func(path string, fi fs.FileInfo, err error) error {
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if err != nil {
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return err
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}
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sansPrefix := strings.TrimPrefix(path, workdir+string(filepath.Separator))
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parts := strings.Split(sansPrefix, string(filepath.Separator))
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if fi.IsDir() || !matcher.Match(parts, fi.IsDir()) {
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return nil
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}
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files = append(files, path)
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return nil
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}); err != nil {
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return nil, "", fmt.Errorf("unable to filepath.Walk: %v", err)
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}
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if len(files) == 0 {
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return nil, "", nil
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}
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matchedFiles := make([]string, 0, len(files))
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resultHasher := sha256.New()
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for _, file := range files {
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f, err := os.Open(file)
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if err != nil {
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return nil, "", fmt.Errorf("unable to os.Open: %v", err)
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}
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hasher := sha256.New()
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if _, err := io.Copy(hasher, f); err != nil {
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return nil, "", fmt.Errorf("unable to io.Copy: %v", err)
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}
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if err := f.Close(); err != nil {
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return nil, "", fmt.Errorf("unable to Close file: %v", err)
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}
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if _, err := resultHasher.Write(hasher.Sum(nil)); err != nil {
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return nil, "", fmt.Errorf("unable to write resultHasher: %v", err)
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}
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matchedFiles = append(matchedFiles, strings.TrimPrefix(file, workdir+string(filepath.Separator)))
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}
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return matchedFiles, hex.EncodeToString(resultHasher.Sum(nil)), nil
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}
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