# Resolve convert-sha256 positionals against unset fields

`4562077`→[main](/content/gh/entireio/git-sync/commits/main/index.html)·

nodo·1mo ago·2 files·+107 added/-8 removed

The previous code assigned args[0] to SourceURL and args[1] to TargetDir unconditionally, so `--source-url <url> <dir>` left TargetDir empty (len(args) == 1, so args[1] was never read) and failed the "requires a source URL and a target directory" check.

Consume positionals left-to-right against fields the user has not yet supplied via flags. The four flag/positional shapes (zero/one/two flags) now all yield the correct assignment. Extracted into resolveConvertSHA256Args for a unit test that covers every shape including the regression case.

## Sessions

Transcript data is unavailable for this checkpoint.

## Changes

2

- cmd/git-sync

- Mconvert_sha256.go+23/-8

- Aconvert_sha256_test.go+84

```
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SilenceUsage:  true,
		RunE: func(cmd *cobra.Command, args []string) error {
			req.ProtocolMode = gitsync.ProtocolMode(protocolVal)
			if req.SourceURL == "" && len(args) > 0 {
				req.SourceURL = args[0]
			}
			if req.TargetDir == "" && len(args) > 1 {
				req.TargetDir = args[1]
			}
			if req.SourceURL == "" || req.TargetDir == "" {
				return errors.New("convert-sha256 requires a source URL and a target directory")
			}
			if err := resolveConvertSHA256Args(&req, args); err != nil {
				return err
			}

result, err := sha256convert.Run(cmd.Context(), req)
41 unmodified lines

return cmd
	}

// resolveConvertSHA256Args consumes positional args left-to-right,
// skipping fields the user already supplied via flags. Without that
// rule, `--source-url <url> <dir>` would look like one positional and
// land in SourceURL — leaving TargetDir empty even though the user
// gave both. The two-flags-no-positionals and zero-flags-two-positionals
// shapes also work, as do the symmetric --target-dir + positional URL.
func resolveConvertSHA256Args(req *sha256convert.Request, args []string) error {
	positional := args
	if req.SourceURL == "" && len(positional) > 0 {
		req.SourceURL = positional[0]
		positional = positional[1:]
	}
	if req.TargetDir == "" && len(positional) > 0 {
		req.TargetDir = positional[0]
	}
	if req.SourceURL == "" || req.TargetDir == "" {
		return errors.New("convert-sha256 requires a source URL and a target directory")
	}
	return nil
}
```

Mcmd/git-sync/convert_sha256.go+23/-8

```
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package main

import (
	"strings"
	"testing"

"entire.io/entire/git-sync/cmd/git-sync/internal/sha256convert"
)

func TestResolveConvertSHA256Args(t *testing.T) {
	const url = "http://example.invalid/repo.git"
	const dir = "/tmp/out"

tests := []struct {
		name    string
		req     sha256convert.Request
		args    []string
		wantURL string
		wantDir string
		wantErr string
	}{
		{
			name:    "both positionals",
			args:    []string{url, dir},
			wantURL: url,
			wantDir: dir,
		},
		{
			name:    "url flag plus positional dir — the reported bug",
			req:     sha256convert.Request{SourceURL: url},
			args:    []string{dir},
			wantURL: url,
			wantDir: dir,
		},
		{
			name:    "dir flag plus positional url",
			req:     sha256convert.Request{TargetDir: dir},
			args:    []string{url},
			wantURL: url,
			wantDir: dir,
		},
		{
			name:    "both flags, no positionals",
			req:     sha256convert.Request{SourceURL: url, TargetDir: dir},
			args:    nil,
			wantURL: url,
			wantDir: dir,
		},
		{
			name:    "missing dir",
			req:     sha256convert.Request{SourceURL: url},
			args:    nil,
			wantErr: "requires a source URL and a target directory",
		},
		{
			name:    "missing both",
			args:    nil,
			wantErr: "requires a source URL and a target directory",
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req := tt.req
			err := resolveConvertSHA256Args(&req, tt.args)
			switch {
			case tt.wantErr == "" && err != nil:
				t.Fatalf("unexpected error: %v", err)
			case tt.wantErr != "" && err == nil:
				t.Fatalf("expected error containing %q, got nil", tt.wantErr)
			case tt.wantErr != "" && !strings.Contains(err.Error(), tt.wantErr):
				t.Fatalf("error %q does not contain %q", err.Error(), tt.wantErr)
			}
			if tt.wantErr != "" {
				return
			}
			if req.SourceURL != tt.wantURL {
				t.Errorf("SourceURL: got %q, want %q", req.SourceURL, tt.wantURL)
			}
			if req.TargetDir != tt.wantDir {
				t.Errorf("TargetDir: got %q, want %q", req.TargetDir, tt.wantDir)
			}
		}
	}
}
```

Acmd/git-sync/convert_sha256_test.go+84