oppi.li
+1
_examples/README.md
+1
_examples/README.md
···
34
34
- [storage](storage/README.md) - Implementing a custom storage system.
35
35
- [sha256](sha256/main.go) - Init and committing repositories that use sha256 as object format.
36
36
- [memory](memory/main.go) - Clone a repository into an in-memory dotgit storage and worktree.
37
+
- [perf-clone](performance/clone/main.go) - Clone a repository with the least time and space complexity.
+1
_examples/common_test.go
+1
_examples/common_test.go
···
28
28
"memory": {defaultURL},
29
29
"merge_base": {cloneRepository(defaultURL, tempFolder()), "--is-ancestor", "HEAD~3", "HEAD^"},
30
30
"open": {cloneRepository(defaultURL, tempFolder())},
31
+
"perf-clone": {cloneRepository(defaultURL, tempFolder())},
31
32
"progress": {defaultURL, tempFolder()},
32
33
"pull": {createRepositoryWithRemote(tempFolder(), defaultURL)},
33
34
"push": {setEmptyRemote(cloneRepository(defaultURL, tempFolder()))},
+64
_examples/performance/clone/main.go
+64
_examples/performance/clone/main.go
···
1
+
package main
2
+
3
+
import (
4
+
"crypto"
5
+
"crypto/sha1"
6
+
"fmt"
7
+
"os"
8
+
9
+
"github.com/go-git/go-git/v5"
10
+
. "github.com/go-git/go-git/v5/_examples"
11
+
"github.com/go-git/go-git/v5/plumbing/hash"
12
+
"github.com/go-git/go-git/v5/utils/trace"
13
+
)
14
+
15
+
// Expands the Basic example focusing in performance.
16
+
func main() {
17
+
CheckArgs("<url>", "<directory>")
18
+
url := os.Args[1]
19
+
directory := os.Args[2]
20
+
21
+
// Replace sha1cd with Golang's sha1 implementation, which is faster.
22
+
// SHA1 as a hash algorithm is broken, so Git implementations tend to use
23
+
// an alternative implementation that includes collision detection - which
24
+
// is the default on go-git and in the git cli.
25
+
//
26
+
// This operation is only safe when interacting with trustworthy Git servers,
27
+
// such as GitHub and GitLab. If your application needs to interact with
28
+
// custom servers or does not impose any sort of constraints on the target
29
+
// server, this is not recommended.
30
+
hash.RegisterHash(crypto.SHA1, sha1.New)
31
+
32
+
// Clone the given repository to the given directory
33
+
Info("GIT_TRACE_PERFORMANCE=true git clone --no-tags --depth 1 --single-branch %s %s", url, directory)
34
+
35
+
// Enable performance metrics. This is only to show the break down per
36
+
// operation, and can be removed. Like in the git CLI, this can be enabled
37
+
// at runtime by environment variable:
38
+
// GIT_TRACE_PERFORMANCE=true
39
+
trace.SetTarget(trace.Performance)
40
+
41
+
r, err := git.PlainClone(directory, false, &git.CloneOptions{
42
+
URL: url,
43
+
// Differently than the git CLI, by default go-git downloads
44
+
// all tags and its related objects. To avoid unnecessary
45
+
// data transmission and processing, opt-out tags.
46
+
Tags: git.NoTags,
47
+
// Shallow clones the repository, returning a single commit.
48
+
Depth: 1,
49
+
// Depth 1 implies single branch, so this is largely redundant.
50
+
SingleBranch: true,
51
+
// Not a net positive change for performance, this was added
52
+
// to better align the output when compared with the git CLI.
53
+
Progress: os.Stdout,
54
+
})
55
+
56
+
CheckIfError(err)
57
+
58
+
ref, err := r.Head()
59
+
CheckIfError(err)
60
+
commit, err := r.CommitObject(ref.Hash())
61
+
CheckIfError(err)
62
+
63
+
fmt.Println(commit)
64
+
}