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package packp
import (
"errors"
"io"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/protocol/packp/capability"
"github.com/go-git/go-git/v5/plumbing/protocol/packp/sideband"
)
var (
ErrEmptyCommands = errors.New("commands cannot be empty")
ErrMalformedCommand = errors.New("malformed command")
)
// ReferenceUpdateRequest values represent reference upload requests.
// Values from this type are not zero-value safe, use the New function instead.
type ReferenceUpdateRequest struct {
Capabilities *capability.List
Commands []*Command
Shallow *plumbing.Hash
// Packfile contains an optional packfile reader.
Packfile io.ReadCloser
// Progress receives sideband progress messages from the server
Progress sideband.Progress
}
// New returns a pointer to a new ReferenceUpdateRequest value.
func NewReferenceUpdateRequest() *ReferenceUpdateRequest {
return &ReferenceUpdateRequest{
// TODO: Add support for push-cert
Capabilities: capability.NewList(),
Commands: nil,
}
}
// NewReferenceUpdateRequestFromCapabilities returns a pointer to a new
// ReferenceUpdateRequest value, the request capabilities are filled with the
// most optimal ones, based on the adv value (advertised capabilities), the
// ReferenceUpdateRequest contains no commands
//
// It does set the following capabilities:
// - agent
// - report-status
// - ofs-delta
// - ref-delta
// - delete-refs
// It leaves up to the user to add the following capabilities later:
// - atomic
// - ofs-delta
// - side-band
// - side-band-64k
// - quiet
// - push-cert
func NewReferenceUpdateRequestFromCapabilities(adv *capability.List) *ReferenceUpdateRequest {
r := NewReferenceUpdateRequest()
if adv.Supports(capability.Agent) {
r.Capabilities.Set(capability.Agent, capability.DefaultAgent)
}
if adv.Supports(capability.ReportStatus) {
r.Capabilities.Set(capability.ReportStatus)
}
return r
}
func (r *ReferenceUpdateRequest) validate() error {
if len(r.Commands) == 0 {
return ErrEmptyCommands
}
for _, c := range r.Commands {
if err := c.validate(); err != nil {
return err
}
}
return nil
}
type Action string
const (
Create Action = "create"
Update = "update"
Delete = "delete"
Invalid = "invalid"
)
type Command struct {
Name plumbing.ReferenceName
Old plumbing.Hash
New plumbing.Hash
}
func (c *Command) Action() Action {
if c.Old == plumbing.ZeroHash && c.New == plumbing.ZeroHash {
return Invalid
}
if c.Old == plumbing.ZeroHash {
return Create
}
if c.New == plumbing.ZeroHash {
return Delete
}
return Update
}
func (c *Command) validate() error {
if c.Action() == Invalid {
return ErrMalformedCommand
}
return nil
}
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