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restic ls --json: print "size":0 for empty files

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This commit is contained in:
greatroar 2021-02-01 15:56:36 +01:00
parent af3de702c7
commit d7322a5f36
3 changed files with 137 additions and 26 deletions
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8
changelog/unreleased/issue-3247 Normal file
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@ -0,0 +1,8 @@
Change: Empty files now have size of 0 in restic ls --json output
Restic ls --json used to omit the sizes of empty files in its output. It now
reports "size":0 explicitly for regular files, while omitting the size field
for all other types.
https://github.com/restic/restic/issues/3247
https://github.com/restic/restic/pull/3257

64
cmd/restic/cmd_ls.go
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@ -74,18 +74,42 @@ type lsSnapshot struct {
StructType string `json:"struct_type"` // "snapshot"
}
type lsNode struct {
Name string `json:"name"`
Type string `json:"type"`
Path string `json:"path"`
UID uint32 `json:"uid"`
GID uint32 `json:"gid"`
Size uint64 `json:"size,omitempty"`
Mode os.FileMode `json:"mode,omitempty"`
ModTime time.Time `json:"mtime,omitempty"`
AccessTime time.Time `json:"atime,omitempty"`
ChangeTime time.Time `json:"ctime,omitempty"`
StructType string `json:"struct_type"` // "node"
// Print node in our custom JSON format, followed by a newline.
func lsNodeJSON(enc *json.Encoder, path string, node *restic.Node) error {
n := &struct {
Name string `json:"name"`
Type string `json:"type"`
Path string `json:"path"`
UID uint32 `json:"uid"`
GID uint32 `json:"gid"`
Size *uint64 `json:"size,omitempty"`
Mode os.FileMode `json:"mode,omitempty"`
ModTime time.Time `json:"mtime,omitempty"`
AccessTime time.Time `json:"atime,omitempty"`
ChangeTime time.Time `json:"ctime,omitempty"`
StructType string `json:"struct_type"` // "node"
size uint64 // Target for Size pointer.
}{
Name: node.Name,
Type: node.Type,
Path: path,
UID: node.UID,
GID: node.GID,
size: node.Size,
Mode: node.Mode,
ModTime: node.ModTime,
AccessTime: node.AccessTime,
ChangeTime: node.ChangeTime,
StructType: "node",
}
// Always print size for regular files, even when empty,
// but never for other types.
if node.Type == "file" {
n.Size = &n.size
}
return enc.Encode(n)
}
func runLs(opts LsOptions, gopts GlobalOptions, args []string) error {
@ -159,7 +183,7 @@ func runLs(opts LsOptions, gopts GlobalOptions, args []string) error {
enc := json.NewEncoder(gopts.stdout)
printSnapshot = func(sn *restic.Snapshot) {
err = enc.Encode(lsSnapshot{
err := enc.Encode(lsSnapshot{
Snapshot: sn,
ID: sn.ID(),
ShortID: sn.ID().Str(),
@ -171,19 +195,7 @@ func runLs(opts LsOptions, gopts GlobalOptions, args []string) error {
}
printNode = func(path string, node *restic.Node) {
err = enc.Encode(lsNode{
Name: node.Name,
Type: node.Type,
Path: path,
UID: node.UID,
GID: node.GID,
Size: node.Size,
Mode: node.Mode,
ModTime: node.ModTime,
AccessTime: node.AccessTime,
ChangeTime: node.ChangeTime,
StructType: "node",
})
err := lsNodeJSON(enc, path, node)
if err != nil {
Warnf("JSON encode failed: %v\n", err)
}

91
cmd/restic/cmd_ls_test.go Normal file
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@ -0,0 +1,91 @@
package main
import (
"bytes"
"encoding/json"
"os"
"testing"
"time"
"github.com/restic/restic/internal/restic"
rtest "github.com/restic/restic/internal/test"
)
func TestLsNodeJSON(t *testing.T) {
for _, c := range []struct {
path string
restic.Node
expect string
}{
// Mode is omitted when zero.
{
path: "/bar/baz",
Node: restic.Node{
Name: "baz",
Type: "file",
Size: 12345,
UID: 10000000,
GID: 20000000,
User: "nobody",
Group: "nobodies",
Links: 1,
},
expect: `{"name":"baz","type":"file","path":"/bar/baz","uid":10000000,"gid":20000000,"size":12345,"mtime":"0001-01-01T00:00:00Z","atime":"0001-01-01T00:00:00Z","ctime":"0001-01-01T00:00:00Z","struct_type":"node"}`,
},
// Even empty files get an explicit size.
{
path: "/foo/empty",
Node: restic.Node{
Name: "empty",
Type: "file",
Size: 0,
UID: 1001,
GID: 1001,
User: "not printed",
Group: "not printed",
Links: 0xF00,
},
expect: `{"name":"empty","type":"file","path":"/foo/empty","uid":1001,"gid":1001,"size":0,"mtime":"0001-01-01T00:00:00Z","atime":"0001-01-01T00:00:00Z","ctime":"0001-01-01T00:00:00Z","struct_type":"node"}`,
},
// Non-regular files do not get a size.
// Mode is printed in decimal, including the type bits.
{
path: "/foo/link",
Node: restic.Node{
Name: "link",
Type: "symlink",
Mode: os.ModeSymlink | 0777,
LinkTarget: "not printed",
},
expect: `{"name":"link","type":"symlink","path":"/foo/link","uid":0,"gid":0,"mode":134218239,"mtime":"0001-01-01T00:00:00Z","atime":"0001-01-01T00:00:00Z","ctime":"0001-01-01T00:00:00Z","struct_type":"node"}`,
},
{
path: "/some/directory",
Node: restic.Node{
Name: "directory",
Type: "dir",
Mode: os.ModeDir | 0755,
ModTime: time.Date(2020, 1, 2, 3, 4, 5, 0, time.UTC),
AccessTime: time.Date(2021, 2, 3, 4, 5, 6, 7, time.UTC),
ChangeTime: time.Date(2022, 3, 4, 5, 6, 7, 8, time.UTC),
},
expect: `{"name":"directory","type":"dir","path":"/some/directory","uid":0,"gid":0,"mode":2147484141,"mtime":"2020-01-02T03:04:05Z","atime":"2021-02-03T04:05:06.000000007Z","ctime":"2022-03-04T05:06:07.000000008Z","struct_type":"node"}`,
},
} {
buf := new(bytes.Buffer)
enc := json.NewEncoder(buf)
err := lsNodeJSON(enc, c.path, &c.Node)
rtest.OK(t, err)
rtest.Equals(t, c.expect+"\n", buf.String())
// Sanity check: output must be valid JSON.
var v interface{}
err = json.NewDecoder(buf).Decode(&v)
rtest.OK(t, err)
}
}