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// Copyright The gittuf Authors
// SPDX-License-Identifier: Apache-2.0
package gitinterface
import (
"fmt"
"sort"
"strings"
)
// GetFilePathsChangedByCommit returns the paths changed by the commit relative
// to its parent commit. If the commit is a merge commit, i.e., it has more than
// one parent, check if the commit is the same as at least one of its parents.
// If there is a matching parent, we return no changes. If there is no matching
// parent commit, we return the changes between the commit and each of its parents.
func (r *Repository) GetFilePathsChangedByCommit(commitID Hash) ([]string, error) {
if err := r.ensureIsCommit(commitID); err != nil {
return nil, err
}
parentCommitIDs, err := r.GetCommitParentIDs(commitID)
if err != nil {
return nil, err
}
if len(parentCommitIDs) == 0 {
filePaths, err := r.executor("ls-tree", "--name-only", "-r", commitID.String()).executeString()
if err != nil {
return nil, fmt.Errorf("unable to identify all commit file paths: %w", err)
}
paths := strings.Split(filePaths, "\n")
return paths, nil
}
if len(parentCommitIDs) > 1 {
// Check if tree matches last commit
stdOut, err := r.executor("diff-tree", "--no-commit-id", "--name-only", "-r", parentCommitIDs[len(parentCommitIDs)-1].String(), commitID.String()).executeString()
if err != nil {
return nil, fmt.Errorf("unable to diff commit against last parent commit: %w", err)
}
if stdOut == "" {
return nil, nil
}
pathSet := map[string]bool{}
for _, parentCommitID := range parentCommitIDs {
stdOut, err := r.executor("diff-tree", "--no-commit-id", "--name-only", "-r", parentCommitID.String(), commitID.String()).executeString()
if err != nil {
return nil, fmt.Errorf("unable to diff commit against parent: %w", err)
}
if stdOut == "" {
continue
}
paths := strings.Split(stdOut, "\n")
for _, path := range paths {
if path == "" {
continue
}
pathSet[path] = true
}
}
paths := make([]string, 0, len(pathSet))
for path := range pathSet {
paths = append(paths, path)
}
sort.Slice(paths, func(i, j int) bool {
return paths[i] < paths[j]
})
return paths, nil
}
stdOut, err := r.executor("diff-tree", "--no-commit-id", "--name-only", "-r", fmt.Sprintf("%s~1", commitID.String()), commitID.String()).executeString()
if err != nil {
return nil, fmt.Errorf("unable to diff commit against parent: %w", err)
}
if stdOut == "" {
return nil, nil
}
paths := strings.Split(stdOut, "\n")
return paths, nil
}
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