mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-30 16:46:27 +00:00
105 lines
2.8 KiB
Go
105 lines
2.8 KiB
Go
package git
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/go-git/go-git/v5/plumbing"
|
|
"github.com/go-git/go-git/v5/plumbing/filemode"
|
|
"github.com/go-git/go-git/v5/plumbing/object"
|
|
"github.com/go-git/go-git/v5/storage"
|
|
)
|
|
|
|
type objectWalker struct {
|
|
Storer storage.Storer
|
|
// seen is the set of objects seen in the repo.
|
|
// seen map can become huge if walking over large
|
|
// repos. Thus using struct{} as the value type.
|
|
seen map[plumbing.Hash]struct{}
|
|
}
|
|
|
|
func newObjectWalker(s storage.Storer) *objectWalker {
|
|
return &objectWalker{s, map[plumbing.Hash]struct{}{}}
|
|
}
|
|
|
|
// walkAllRefs walks all (hash) references from the repo.
|
|
func (p *objectWalker) walkAllRefs() error {
|
|
// Walk over all the references in the repo.
|
|
it, err := p.Storer.IterReferences()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer it.Close()
|
|
err = it.ForEach(func(ref *plumbing.Reference) error {
|
|
// Exit this iteration early for non-hash references.
|
|
if ref.Type() != plumbing.HashReference {
|
|
return nil
|
|
}
|
|
return p.walkObjectTree(ref.Hash())
|
|
})
|
|
return err
|
|
}
|
|
|
|
func (p *objectWalker) isSeen(hash plumbing.Hash) bool {
|
|
_, seen := p.seen[hash]
|
|
return seen
|
|
}
|
|
|
|
func (p *objectWalker) add(hash plumbing.Hash) {
|
|
p.seen[hash] = struct{}{}
|
|
}
|
|
|
|
// walkObjectTree walks over all objects and remembers references
|
|
// to them in the objectWalker. This is used instead of the revlist
|
|
// walks because memory usage is tight with huge repos.
|
|
func (p *objectWalker) walkObjectTree(hash plumbing.Hash) error {
|
|
// Check if we have already seen, and mark this object
|
|
if p.isSeen(hash) {
|
|
return nil
|
|
}
|
|
p.add(hash)
|
|
// Fetch the object.
|
|
obj, err := object.GetObject(p.Storer, hash)
|
|
if err != nil {
|
|
return fmt.Errorf("Getting object %s failed: %v", hash, err)
|
|
}
|
|
// Walk all children depending on object type.
|
|
switch obj := obj.(type) {
|
|
case *object.Commit:
|
|
err = p.walkObjectTree(obj.TreeHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, h := range obj.ParentHashes {
|
|
err = p.walkObjectTree(h)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
case *object.Tree:
|
|
for i := range obj.Entries {
|
|
// Shortcut for blob objects:
|
|
// 'or' the lower bits of a mode and check that it
|
|
// it matches a filemode.Executable. The type information
|
|
// is in the higher bits, but this is the cleanest way
|
|
// to handle plain files with different modes.
|
|
// Other non-tree objects are somewhat rare, so they
|
|
// are not special-cased.
|
|
if obj.Entries[i].Mode|0755 == filemode.Executable {
|
|
p.add(obj.Entries[i].Hash)
|
|
continue
|
|
}
|
|
// Normal walk for sub-trees (and symlinks etc).
|
|
err = p.walkObjectTree(obj.Entries[i].Hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
case *object.Tag:
|
|
return p.walkObjectTree(obj.Target)
|
|
default:
|
|
// Error out on unhandled object types.
|
|
return fmt.Errorf("Unknown object %X %s %T\n", obj.ID(), obj.Type(), obj)
|
|
}
|
|
return nil
|
|
}
|