Add carve utility for updating the index of a car{v1,v2} file

v2/cmd/car/car.go

@@ -0,0 +1,158 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"log"
+	"os"
+
+	"github.com/ipfs/go-cid"
+	carv1 "github.com/ipld/go-car"
+	carv2 "github.com/ipld/go-car/v2"
+	"github.com/ipld/go-car/v2/index"
+	"github.com/multiformats/go-multicodec"
+	"github.com/multiformats/go-varint"
+	"github.com/urfave/cli/v2"
+)
+
+func main() {
+	app := &cli.App{
+		Name:  "car",
+		Usage: "Utility for working with car files",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:    "codec",
+				Aliases: []string{"c"},
+				Usage:   "The type of index to write",
+				Value:   "CarMultihashIndexSorted",
+			},
+		},
+		Commands: []*cli.Command{
+			{
+				Name:    "index",
+				Aliases: []string{"i"},
+				Usage:   "write out the car with an index",
+				Action: func(c *cli.Context) error {
+					r, err := carv2.OpenReader(c.Args().Get(0))
+					if err != nil {
+						return err
+					}
+					defer r.Close()
+
+					var idx index.Index
+					if c.String("codec") != "none" {
+						var mc multicodec.Code
+						if err := mc.Set(c.String("codec")); err != nil {
+							return fmt.Errorf("unknown codec: %s", c.String("codec"))
+						}
+						idx, err = index.New(mc)
+						if err != nil {
+							return err
+						}
+					}
+
+					outStream := os.Stdout
+					if c.Args().Len() >= 2 {
+						outStream, err = os.Create(c.Args().Get(1))
+						if err != nil {
+							return err
+						}
+					}
+					defer outStream.Close()
+
+					v1r := r.DataReader()
+
+					v2Header := carv2.NewHeader(r.Header.DataSize)
+					if c.String("codec") == "none" {
+						v2Header.IndexOffset = 0
+						if _, err := outStream.Write(carv2.Pragma); err != nil {
+							return err
+						}
+						if _, err := v2Header.WriteTo(outStream); err != nil {
+							return err
+						}
+						if _, err := io.Copy(outStream, v1r); err != nil {
+							return err
+						}
+						return nil
+					}
+
+					if _, err := outStream.Write(carv2.Pragma); err != nil {
+						return err
+					}
+					if _, err := v2Header.WriteTo(outStream); err != nil {
+						return err
+					}
+
+					// collect records as we go through the v1r
+					rdr, err := carv1.NewCarReader(v1r)
+					if err != nil {
+						return fmt.Errorf("error reading car header: %w", err)
+					}
+					if err := carv1.WriteHeader(rdr.Header, outStream); err != nil {
+						return err
+					}
+
+					records := make([]index.Record, 0)
+					var sectionOffset int64
+					if sectionOffset, err = v1r.Seek(0, io.SeekCurrent); err != nil {
+						return err
+					}
+
+					br := bufio.NewReader(v1r)
+					for {
+						// Read the section's length.
+						sectionLen, err := varint.ReadUvarint(br)
+						if err != nil {
+							if err == io.EOF {
+								break
+							}
+							return err
+						}
+						if _, err := outStream.Write(varint.ToUvarint(sectionLen)); err != nil {
+							return err
+						}
+
+						// Null padding; by default it's an error.
+						// TODO: integrate corresponding ReadOption
+						if sectionLen == 0 {
+							// TODO: pad writer to expected length.
+							break
+						}
+
+						// Read the CID.
+						cidLen, c, err := cid.CidFromReader(br)
+						if err != nil {
+							return err
+						}
+						records = append(records, index.Record{Cid: c, Offset: uint64(sectionOffset)})
+						if _, err := c.WriteBytes(outStream); err != nil {
+							return err
+						}
+
+						// Seek to the next section by skipping the block.
+						// The section length includes the CID, so subtract it.
+						remainingSectionLen := int64(sectionLen) - int64(cidLen)
+						if _, err := io.CopyN(outStream, br, remainingSectionLen); err != nil {
+							return err
+						}
+						sectionOffset += int64(sectionLen) + int64(varint.UvarintSize(sectionLen))
+					}
+
+					if err := idx.Load(records); err != nil {
+						return err
+					}
+
+					return index.WriteTo(idx, outStream)
+				},
+			},
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal(err)
+		os.Exit(1)
+	}
+}

v2/go.mod

@@ -9,13 +9,15 @@ require (
 	github.com/ipfs/go-ipld-cbor v0.0.5
 	github.com/ipfs/go-ipld-format v0.2.0
 	github.com/ipfs/go-merkledag v0.3.2
+	github.com/ipld/go-car v0.3.1
 	github.com/klauspost/cpuid/v2 v2.0.8 // indirect
 	github.com/mattn/go-colorable v0.1.8 // indirect
 	github.com/multiformats/go-multicodec v0.3.1-0.20210902112759-1539a079fd61
 	github.com/multiformats/go-multihash v0.0.15
 	github.com/multiformats/go-varint v0.0.6
 	github.com/petar/GoLLRB v0.0.0-20210522233825-ae3b015fd3e9
 	github.com/stretchr/testify v1.7.0
+	github.com/urfave/cli/v2 v2.3.0
 	github.com/whyrusleeping/cbor v0.0.0-20171005072247-63513f603b11
 	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
 	golang.org/x/exp v0.0.0-20210615023648-acb5c1269671

v2/go.sum

@@ -53,6 +53,7 @@ github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
 github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/cskr/pubsub v1.0.2 h1:vlOzMhl6PFn60gRlTQQsIfVwaPB/B/8MziK8FhEPt/0=
@@ -76,6 +77,8 @@ github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/franela/goblin v0.0.0-20200105215937-c9ffbefa60db/go.mod h1:7dvUGVsVBjqR7JHJk0brhHOZYGmfBYOrK0ZhYMEtBr4=
 github.com/franela/goreq v0.0.0-20171204163338-bcd34c9993f8/go.mod h1:ZhphrRTfi2rbfLwlschooIH4+wKKDR4Pdxhh+TRoA20=
+github.com/frankban/quicktest v1.11.3 h1:8sXhOn0uLys67V8EsXLc6eszDs8VXWxL3iRvebPhedY=
+github.com/frankban/quicktest v1.11.3/go.mod h1:wRf/ReqHper53s+kmmSZizM8NamnL3IM0I9ntUbOk+k=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/go-check/check v0.0.0-20180628173108-788fd7840127/go.mod h1:9ES+weclKsC9YodN5RgxqK/VD9HM9JsCSh7rNhMZE98=
@@ -110,6 +113,8 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
@@ -171,6 +176,7 @@ github.com/ipfs/go-blockservice v0.1.0/go.mod h1:hzmMScl1kXHg3M2BjTymbVPjv627N7s
 github.com/ipfs/go-cid v0.0.1/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
 github.com/ipfs/go-cid v0.0.2/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
 github.com/ipfs/go-cid v0.0.3/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUPQvM=
+github.com/ipfs/go-cid v0.0.4/go.mod h1:4LLaPOQwmk5z9LBgQnpkivrx8BJjUyGwTXCd5Xfj6+M=
 github.com/ipfs/go-cid v0.0.5/go.mod h1:plgt+Y5MnOey4vO4UlUazGqdbEXuFYitED67FexhXog=
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 github.com/ipfs/go-cid v0.0.8-0.20210716091050-de6c03deae1c h1:uVMZWk8sJN1l/47TtXRXDz0M9/6v0yw7neDn5WfeLwg=
@@ -225,6 +231,12 @@ github.com/ipfs/go-peertaskqueue v0.1.0 h1:bpRbgv76eT4avutNPDFZuCPOQus6qTgurEYxf
 github.com/ipfs/go-peertaskqueue v0.1.0/go.mod h1:Jmk3IyCcfl1W3jTW3YpghSwSEC6IJ3Vzz/jUmWw8Z0U=
 github.com/ipfs/go-verifcid v0.0.1 h1:m2HI7zIuR5TFyQ1b79Da5N9dnnCP1vcu2QqawmWlK2E=
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+github.com/ipld/go-car v0.3.1 h1:WT+3cdmXlvmWOlGxk9webhj4auGO5QvgqC2vCCkFRXs=
+github.com/ipld/go-car v0.3.1/go.mod h1:dPkEWeAK8KaVvH5TahaCs6Mncpd4lDMpkbs0/SPzuVs=
+github.com/ipld/go-codec-dagpb v1.2.0 h1:2umV7ud8HBMkRuJgd8gXw95cLhwmcYrihS3cQEy9zpI=
+github.com/ipld/go-codec-dagpb v1.2.0/go.mod h1:6nBN7X7h8EOsEejZGqC7tej5drsdBAXbMHyBT+Fne5s=
+github.com/ipld/go-ipld-prime v0.9.0 h1:N2OjJMb+fhyFPwPnVvJcWU/NsumP8etal+d2v3G4eww=
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@@ -257,8 +269,9 @@ github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxv
 github.com/koron/go-ssdp v0.0.0-20180514024734-4a0ed625a78b h1:wxtKgYHEncAU00muMD06dzLiahtGM1eouRNOzVV7tdQ=
 github.com/koron/go-ssdp v0.0.0-20180514024734-4a0ed625a78b/go.mod h1:5Ky9EC2xfoUKUor0Hjgi2BJhCSXJfMOFlmyYrVKGQMk=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
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 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
@@ -428,8 +441,10 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pkg/profile v1.2.1/go.mod h1:hJw3o1OdXxsrSjjVksARp5W95eeEaEfptyVZyv6JUPA=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/polydawn/refmt v0.0.0-20190221155625-df39d6c2d992 h1:bzMe+2coZJYHnhGgVlcQKuRy4FSny4ds8dLQjw5P1XE=
 github.com/polydawn/refmt v0.0.0-20190221155625-df39d6c2d992/go.mod h1:uIp+gprXxxrWSjjklXD+mN4wed/tMfjMMmN/9+JsA9o=
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+github.com/polydawn/refmt v0.0.0-20201211092308-30ac6d18308e/go.mod h1:uIp+gprXxxrWSjjklXD+mN4wed/tMfjMMmN/9+JsA9o=
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@@ -452,10 +467,12 @@ github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6So
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 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
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@@ -487,9 +504,13 @@ github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
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+github.com/warpfork/go-wish v0.0.0-20200122115046-b9ea61034e4a/go.mod h1:x6AKhvSSexNrVSrViXSHUEbICjmGXhtgABaHIySUSGw=
 github.com/whyrusleeping/cbor v0.0.0-20171005072247-63513f603b11 h1:5HZfQkwe0mIfyDmc1Em5GqlNRzcdtlv4HTNmdpt7XH0=
 github.com/whyrusleeping/cbor v0.0.0-20171005072247-63513f603b11/go.mod h1:Wlo/SzPmxVp6vXpGt/zaXhHH0fn4IxgqZc82aKg6bpQ=
 github.com/whyrusleeping/cbor-gen v0.0.0-20200123233031-1cdf64d27158 h1:WXhVOwj2USAXB5oMDwRl3piOux2XMV9TANaYxXHdkoE=
@@ -689,6 +710,7 @@ gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRN
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=