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package commands
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io"
"os"
"github.com/git-lfs/git-lfs/v3/git"
"github.com/git-lfs/git-lfs/v3/lfs"
"github.com/git-lfs/git-lfs/v3/tr"
"github.com/spf13/cobra"
)
var (
pointerFile string
pointerCompare string
pointerStdin bool
pointerCheck bool
pointerStrict bool
pointerNoStrict bool
)
func pointerCommand(cmd *cobra.Command, args []string) {
comparing := false
something := false
buildOid := ""
compareOid := ""
if pointerCheck {
var r io.ReadCloser
var err error
if pointerStrict && pointerNoStrict {
ExitWithError(errors.New(tr.Tr.Get("Cannot combine --strict with --no-strict")))
}
if len(pointerCompare) > 0 {
ExitWithError(errors.New(tr.Tr.Get("Cannot combine --check with --compare")))
}
if len(pointerFile) > 0 {
if pointerStdin {
ExitWithError(errors.New(tr.Tr.Get("With --check, --file cannot be combined with --stdin")))
}
r, err = os.Open(pointerFile)
if err != nil {
ExitWithError(err)
}
} else if pointerStdin {
r = io.NopCloser(os.Stdin)
} else {
ExitWithError(errors.New(tr.Tr.Get("Must specify either --file or --stdin with --compare")))
}
p, err := lfs.DecodePointer(r)
if err != nil {
os.Exit(1)
}
if pointerStrict && !p.Canonical {
os.Exit(2)
}
r.Close()
return
}
if len(pointerCompare) > 0 || pointerStdin {
comparing = true
}
if len(pointerFile) > 0 {
something = true
buildFile, err := os.Open(pointerFile)
if err != nil {
Error(err.Error())
os.Exit(1)
}
oidHash := sha256.New()
size, err := io.Copy(oidHash, buildFile)
buildFile.Close()
if err != nil {
Error(err.Error())
os.Exit(1)
}
ptr := lfs.NewPointer(hex.EncodeToString(oidHash.Sum(nil)), size, nil)
fmt.Fprint(os.Stderr, tr.Tr.Get("Git LFS pointer for %s", pointerFile), "\n\n")
buf := &bytes.Buffer{}
lfs.EncodePointer(io.MultiWriter(os.Stdout, buf), ptr)
if comparing {
buildOid, err = git.HashObject(bytes.NewReader(buf.Bytes()))
if err != nil {
Error(err.Error())
os.Exit(1)
}
fmt.Fprint(os.Stderr, "\n", tr.Tr.Get("Git blob OID: %s", buildOid), "\n\n")
}
} else {
comparing = false
}
if len(pointerCompare) > 0 || pointerStdin {
something = true
compFile, err := pointerReader()
if err != nil {
Error(err.Error())
os.Exit(1)
}
buf := &bytes.Buffer{}
tee := io.TeeReader(compFile, buf)
_, err = lfs.DecodePointer(tee)
compFile.Close()
pointerName := "STDIN"
if !pointerStdin {
pointerName = pointerCompare
}
fmt.Fprint(os.Stderr, tr.Tr.Get("Pointer from %s", pointerName), "\n\n")
if err != nil {
Error(err.Error())
os.Exit(1)
}
fmt.Fprintf(os.Stderr, buf.String())
if comparing {
compareOid, err = git.HashObject(bytes.NewReader(buf.Bytes()))
if err != nil {
Error(err.Error())
os.Exit(1)
}
fmt.Fprint(os.Stderr, "\n", tr.Tr.Get("Git blob OID: %s", compareOid), "\n")
}
}
if comparing && buildOid != compareOid {
fmt.Fprint(os.Stderr, "\n", tr.Tr.Get("Pointers do not match"), "\n")
os.Exit(1)
}
if !something {
Error(tr.Tr.Get("Nothing to do!"))
os.Exit(1)
}
}
func pointerReader() (io.ReadCloser, error) {
if len(pointerCompare) > 0 {
if pointerStdin {
return nil, errors.New(tr.Tr.Get("cannot read from STDIN and --pointer"))
}
return os.Open(pointerCompare)
}
requireStdin(tr.Tr.Get("The --stdin flag expects a pointer file from STDIN."))
return os.Stdin, nil
}
func init() {
RegisterCommand("pointer", pointerCommand, func(cmd *cobra.Command) {
cmd.Flags().StringVarP(&pointerFile, "file", "f", "", "Path to a local file to generate the pointer from.")
cmd.Flags().StringVarP(&pointerCompare, "pointer", "p", "", "Path to a local file containing a pointer built by another Git LFS implementation.")
cmd.Flags().BoolVarP(&pointerStdin, "stdin", "", false, "Read a pointer built by another Git LFS implementation through STDIN.")
cmd.Flags().BoolVarP(&pointerCheck, "check", "", false, "Check whether the given file is a Git LFS pointer.")
cmd.Flags().BoolVarP(&pointerStrict, "strict", "", false, "Check whether the given Git LFS pointer is canonical.")
cmd.Flags().BoolVarP(&pointerNoStrict, "no-strict", "", false, "Don't check whether the given Git LFS pointer is canonical.")
})
}
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