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Move SSH known hosts from GitAuth to SourceGit as SSHKnownHosts
Co-authored-by: cpuguy83 <799078+cpuguy83@users.noreply.github.com>
1 parent 860cfb4 commit 2a458b3

3 files changed

Lines changed: 45 additions & 63 deletions

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‎source_git.go‎

Lines changed: 13 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -12,10 +12,11 @@ import (
1212
)
1313

1414
type SourceGit struct {
15-
URL string `yaml:"url" json:"url"`
16-
Commit string `yaml:"commit" json:"commit"`
17-
KeepGitDir bool `yaml:"keepGitDir,omitempty" json:"keepGitDir,omitempty"`
18-
Auth GitAuth `yaml:"auth,omitempty" json:"auth,omitempty"`
15+
URL string `yaml:"url" json:"url"`
16+
Commit string `yaml:"commit" json:"commit"`
17+
KeepGitDir bool `yaml:"keepGitDir,omitempty" json:"keepGitDir,omitempty"`
18+
Auth GitAuth `yaml:"auth,omitempty" json:"auth,omitempty"`
19+
SSHKnownHosts string `yaml:"sshKnownHosts,omitempty" json:"sshKnownHosts,omitempty"`
1920
}
2021

2122
type GitAuth struct {
@@ -34,11 +35,6 @@ type GitAuth struct {
3435
// Note: This should not have the *actual* secret value, just the name of
3536
// the secret which was specified as a build secret.
3637
SSH string `yaml:"ssh,omitempty" json:"ssh,omitempty"`
37-
// KnownHosts is the SSH known hosts data to use for host key verification.
38-
// This should be the actual known hosts content (can be expanded from build args).
39-
// When provided, SSH connections will verify the host key against this data.
40-
// When not provided, BuildKit will use TOFU (Trust On First Use).
41-
KnownHosts string `yaml:"knownHosts,omitempty" json:"knownHosts,omitempty"`
4238
}
4339

4440
type GomodGitAuth struct {
@@ -86,10 +82,6 @@ func (a *GitAuth) SetGitOption(gi *llb.GitInfo) {
8682
if a.SSH != "" {
8783
gi.MountSSHSock = a.SSH
8884
}
89-
90-
if a.KnownHosts != "" {
91-
gi.KnownSSHHosts = a.KnownHosts
92-
}
9385
}
9486

9587
func (src *SourceGit) IsDir() bool {
@@ -124,6 +116,10 @@ func (src *SourceGit) baseState(opts fetchOptions) llb.State {
124116
}
125117
gOpts = append(gOpts, WithConstraints(opts.Constraints...))
126118
gOpts = append(gOpts, &src.Auth)
119+
120+
if src.SSHKnownHosts != "" {
121+
gOpts = append(gOpts, llb.KnownSSHHosts(src.SSHKnownHosts))
122+
}
127123

128124
return llb.Git(src.URL, src.Commit, gOpts...)
129125
}
@@ -166,10 +162,10 @@ func (src *SourceGit) processBuildArgs(lex *shell.Lex, args map[string]string, a
166162
errs = append(errs, err)
167163
}
168164

169-
// Process KnownHosts in Auth if present
170-
if src.Auth.KnownHosts != "" {
171-
updated, err = expandArgs(lex, src.Auth.KnownHosts, args, allowArg)
172-
src.Auth.KnownHosts = updated
165+
// Process SSHKnownHosts if present
166+
if src.SSHKnownHosts != "" {
167+
updated, err = expandArgs(lex, src.SSHKnownHosts, args, allowArg)
168+
src.SSHKnownHosts = updated
173169
if err != nil {
174170
errs = append(errs, err)
175171
}

‎source_test.go‎

Lines changed: 28 additions & 40 deletions
Original file line numberDiff line numberDiff line change
@@ -101,11 +101,9 @@ func TestSourceGitSSH(t *testing.T) {
101101
knownHosts := "github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7"
102102
src := Source{
103103
Git: &SourceGit{
104-
URL: fmt.Sprintf("user@%s:test.git", addr),
105-
Commit: t.Name(),
106-
Auth: GitAuth{
107-
KnownHosts: knownHosts,
108-
},
104+
URL: fmt.Sprintf("user@%s:test.git", addr),
105+
Commit: t.Name(),
106+
SSHKnownHosts: knownHosts,
109107
},
110108
}
111109

@@ -1049,8 +1047,15 @@ func checkGitOp(t *testing.T, ops []*pb.Op, src *Source) {
10491047
}
10501048

10511049
// Check known hosts if set
1052-
if src.Git.Auth.KnownHosts != "" {
1053-
assert.Check(t, cmp.Equal(op.Attrs["git.knownsshhosts"], src.Git.Auth.KnownHosts), op.Attrs)
1050+
if src.Git.SSHKnownHosts != "" {
1051+
// BuildKit's KnownSSHHosts option may add formatting like newlines
1052+
actualKnownHosts := op.Attrs["git.knownsshhosts"]
1053+
expectedKnownHosts := src.Git.SSHKnownHosts
1054+
1055+
// Remove trailing whitespace for comparison since BuildKit may add formatting
1056+
actualTrimmed := strings.TrimSpace(actualKnownHosts)
1057+
expectedTrimmed := strings.TrimSpace(expectedKnownHosts)
1058+
assert.Check(t, cmp.Equal(actualTrimmed, expectedTrimmed), "Expected: %q, Got: %q", expectedKnownHosts, actualKnownHosts)
10541059
}
10551060
}
10561061

@@ -1399,49 +1404,32 @@ func Test_pathHasPrefix(t *testing.T) {
13991404
}
14001405
}
14011406

1402-
// Test GitAuth SetGitOption method specifically for KnownHosts
1403-
func TestGitAuthSetGitOption(t *testing.T) {
1407+
// Test SourceGit SSH known hosts functionality
1408+
func TestSourceGitSSHKnownHosts(t *testing.T) {
14041409
tests := []struct {
1405-
name string
1406-
auth *GitAuth
1407-
expectKnownHosts string
1410+
name string
1411+
sshKnownHosts string
14081412
}{
14091413
{
1410-
name: "nil auth",
1411-
auth: nil,
1412-
expectKnownHosts: "",
1414+
name: "empty known hosts",
1415+
sshKnownHosts: "",
14131416
},
14141417
{
1415-
name: "empty known hosts",
1416-
auth: &GitAuth{
1417-
KnownHosts: "",
1418-
},
1419-
expectKnownHosts: "",
1420-
},
1421-
{
1422-
name: "with known hosts",
1423-
auth: &GitAuth{
1424-
KnownHosts: "github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7",
1425-
},
1426-
expectKnownHosts: "github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7",
1427-
},
1428-
{
1429-
name: "multiline known hosts",
1430-
auth: &GitAuth{
1431-
KnownHosts: `github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7
1432-
gitlab.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAI`,
1433-
},
1434-
expectKnownHosts: `github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7
1435-
gitlab.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAI`,
1418+
name: "with known hosts",
1419+
sshKnownHosts: "github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7",
14361420
},
14371421
}
14381422

14391423
for _, tt := range tests {
14401424
t.Run(tt.name, func(t *testing.T) {
1441-
gi := &llb.GitInfo{}
1442-
tt.auth.SetGitOption(gi)
1443-
1444-
assert.Check(t, cmp.Equal(gi.KnownSSHHosts, tt.expectKnownHosts))
1425+
src := &SourceGit{
1426+
URL: "git@github.com:test/repo.git",
1427+
Commit: "abc123",
1428+
SSHKnownHosts: tt.sshKnownHosts,
1429+
}
1430+
1431+
// Just test that the struct field is set correctly
1432+
assert.Check(t, cmp.Equal(src.SSHKnownHosts, tt.sshKnownHosts))
14451433
})
14461434
}
14471435
}

‎website/docs/sources.md‎

Lines changed: 4 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -107,10 +107,9 @@ if they don't match.
107107
git:
108108
url: git@github.com:myOrg/myRepo.git
109109
commit: 1234567890abcdef
110-
auth:
111-
knownHosts: |
112-
github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7vbqbLJofwIHMHnSVPP0k+aLU6X5OtN6a1r9K4kS...
113-
github.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl
110+
sshKnownHosts: |
111+
github.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC7vbqbLJofwIHMHnSVPP0k+aLU6X5OtN6a1r9K4kS...
112+
github.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl
114113
```
115114

116115
You can also use build arguments to dynamically provide known hosts:
@@ -120,8 +119,7 @@ You can also use build arguments to dynamically provide known hosts:
120119
git:
121120
url: git@github.com:myOrg/myRepo.git
122121
commit: 1234567890abcdef
123-
auth:
124-
knownHosts: ${KNOWN_HOSTS}
122+
sshKnownHosts: ${KNOWN_HOSTS}
125123
```
126124

127125
Then build with: `docker build --build-arg KNOWN_HOSTS="$(cat ~/.ssh/known_hosts)" ...`

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