Add git implementation flag and note about Azure DevOps

Signed-off-by: Philip Laine <philip.laine@gmail.com>

cmd/flux/create_source_git.go

@@ -99,6 +99,7 @@ var (
 	sourceGitRSABits        flags.RSAKeyBits         = 2048
 	sourceGitECDSACurve                              = flags.ECDSACurve{Curve: elliptic.P384()}
 	sourceGitSecretRef      string
+	sourceGitImplementation string
 )
 
 func init() {
@@ -112,6 +113,7 @@ func init() {
 	createSourceGitCmd.Flags().Var(&sourceGitRSABits, "ssh-rsa-bits", sourceGitRSABits.Description())
 	createSourceGitCmd.Flags().Var(&sourceGitECDSACurve, "ssh-ecdsa-curve", sourceGitECDSACurve.Description())
 	createSourceGitCmd.Flags().StringVarP(&sourceGitSecretRef, "secret-ref", "", "", "the name of an existing secret containing SSH or basic credentials")
+	createSourceGitCmd.Flags().StringVar(&sourceGitImplementation, "git-implementation", "", "the git implementation to use, can be 'go-git' or 'libgit2'")
 
 	createSourceCmd.AddCommand(createSourceGitCmd)
 }
@@ -142,6 +144,10 @@ func createSourceGitCmdRun(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
+	if !utils.ContainsItemString([]string{sourcev1.GoGitImplementation, sourcev1.LibGit2Implementation, ""}, sourceGitImplementation) {
+		return fmt.Errorf("Invalid git implementation %q", sourceGitImplementation)
+	}
+
 	gitRepository := sourcev1.GitRepository{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      name,
@@ -154,6 +160,7 @@ func createSourceGitCmdRun(cmd *cobra.Command, args []string) error {
 				Duration: interval,
 			},
 			Reference:         &sourcev1.GitRepositoryRef{},
+			GitImplementation: sourceGitImplementation,
 		},
 	}
 

docs/cmd/flux_create_source_git.md

@@ -56,6 +56,7 @@ flux create source git [name] [flags]
 
 ```
       --branch string                          git branch (default "master")
+      --git-implementation string              the git implementation to use, can be 'go-git' or 'libgit2'
   -h, --help                                   help for git
   -p, --password string                        basic authentication password
       --secret-ref string                      the name of an existing secret containing SSH or basic credentials

docs/guides/installation.md

@@ -217,7 +217,16 @@ flux bootstrap gitlab \
 
 ### Generic Git Server
 
-For other Git providers such as Bitbucket, Gogs, Gitea, etc you can manually setup the repository and the deploy key.
+For other Git providers such as Bitbucket, Gogs, Gitea, Azure DevOps, etc you can manually setup the repository and the deploy key.
+
+#### Note about Azure DevOps
+
+Azure DevOps requires a non-default Git implementation (`libgit2`) to be enabled, so that the Git v2 protocol is supported.
+Note that this implementation does not support shallow cloning, and it is therefore advised to only resort to this option if a
+connection fails with the default configuration.
+
+Additionally, the current implementation of image automation does not support Azure DevOps as has no Git implementation with
+this protocol. This limitation will likely change in the future.
 
 Create a Git repository and clone it locally:
 
@@ -298,6 +307,18 @@ flux create source git flux-system \
   --interval=1m
 ```
 
+If you are using Azure DevOps you need to specify a different git implementation than the default:
+
+```sh
+flux create source git flux-system \
+  --url= ssh://<host>/<org>/my-repository \
+  --ssh-key-algorithm=ecdsa \
+  --ssh-ecdsa-curve=p521 \
+  --branch=master \
+  --interval=1m \
+  --git-implementation=libgit2
+```
+
 You will be prompted to add a deploy key to your repository.
 If you don't specify the SSH algorithm, then `flux` will generate an RSA 2048 bits key.
 

go.sum

@@ -139,13 +139,11 @@ github.com/fluxcd/kustomize-controller/api v0.4.0/go.mod h1:NB4aJ+hSWyg6Tx6p47ZW
 github.com/fluxcd/notification-controller/api v0.5.0 h1:xKKFnPVsYl2+GEjgKz5a5Mq6vmy+H2q9d2lJ2jmWJZs=
 github.com/fluxcd/notification-controller/api v0.5.0/go.mod h1:yLd+nrCJUThSkt4U+LLv8TRxqZdR11+gE1S2/bhgqmE=
 github.com/fluxcd/pkg/apis/meta v0.3.0/go.mod h1:wOzQQx8CdtUQCGaLzqGu4QgnNxYkI6/wvdvlovxWhF0=
-github.com/fluxcd/pkg/apis/meta v0.4.0 h1:JChqB9GGgorW9HWKxirTVV0rzrcLyzBaVjinmqZ0iHA=
 github.com/fluxcd/pkg/apis/meta v0.4.0/go.mod h1:wOzQQx8CdtUQCGaLzqGu4QgnNxYkI6/wvdvlovxWhF0=
 github.com/fluxcd/pkg/apis/meta v0.5.0 h1:FaU++mQY0g4sVVl+hG+vk0CXBLbb4EVfRuzs3IjLXvo=
 github.com/fluxcd/pkg/apis/meta v0.5.0/go.mod h1:aEUuZIawboAAFLlYz/juVJ7KNmlWbBtJFYkOWWmGUR4=
 github.com/fluxcd/pkg/git v0.1.0 h1:WtQSoR1SlsI8IsiJGiFzbH9IyxFZPsTtxraAp68/H+U=
 github.com/fluxcd/pkg/git v0.1.0/go.mod h1:AO+smmdF7X+ciTypdoMOTbAHeiYCCSaa56OfW0Xo064=
-github.com/fluxcd/pkg/runtime v0.3.1 h1:UI+FQd1OgipZ6N8YxXHtKYMAu1NRFWaR/Gp1M3T6RZA=
 github.com/fluxcd/pkg/runtime v0.3.1/go.mod h1:wg33L6k5FkGEYoZta7hbUlBIscM5VZd/PfCbaEi+wK4=
 github.com/fluxcd/pkg/runtime v0.4.0 h1:d/1okReK7ZyrQ2k/GKY1BEiMZNHu1rWKUxlHx2O45EY=
 github.com/fluxcd/pkg/runtime v0.4.0/go.mod h1:0Rbkgh3qj8Dl4uitccLc13hZyet1vvNJCAFAVUwNZDM=
@@ -856,7 +854,6 @@ honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWh
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 k8s.io/api v0.17.0/go.mod h1:npsyOePkeP0CPwyGfXDHxvypiYMJxBWAMpQxCaJ4ZxI=
 k8s.io/api v0.18.6/go.mod h1:eeyxr+cwCjMdLAmr2W3RyDI0VvTawSg/3RFFBEnmZGI=
-k8s.io/api v0.19.3 h1:GN6ntFnv44Vptj/b+OnMW7FmzkpDoIDLZRvKX3XH9aU=
 k8s.io/api v0.19.3/go.mod h1:VF+5FT1B74Pw3KxMdKyinLo+zynBaMBiAfGMuldcNDs=
 k8s.io/api v0.19.4 h1:I+1I4cgJYuCDgiLNjKx7SLmIbwgj9w7N7Zr5vSIdwpo=
 k8s.io/api v0.19.4/go.mod h1:SbtJ2aHCItirzdJ36YslycFNzWADYH3tgOhvBEFtZAk=
@@ -865,7 +862,6 @@ k8s.io/apiextensions-apiserver v0.19.4 h1:D9ak9T012tb3vcGFWYmbQuj9SCC8YM4zhA4XZq
 k8s.io/apiextensions-apiserver v0.19.4/go.mod h1:B9rpH/nu4JBCtuUp3zTTk8DEjZUupZTBEec7/2zNRYw=
 k8s.io/apimachinery v0.17.0/go.mod h1:b9qmWdKlLuU9EBh+06BtLcSf/Mu89rWL33naRxs1uZg=
 k8s.io/apimachinery v0.18.6/go.mod h1:OaXp26zu/5J7p0f92ASynJa1pZo06YlV9fG7BoWbCko=
-k8s.io/apimachinery v0.19.3 h1:bpIQXlKjB4cB/oNpnNnV+BybGPR7iP5oYpsOTEJ4hgc=
 k8s.io/apimachinery v0.19.3/go.mod h1:DnPGDnARWFvYa3pMHgSxtbZb7gpzzAZ1pTfaUNDVlmA=
 k8s.io/apimachinery v0.19.4 h1:+ZoddM7nbzrDCp0T3SWnyxqf8cbWPT2fkZImoyvHUG0=
 k8s.io/apimachinery v0.19.4/go.mod h1:DnPGDnARWFvYa3pMHgSxtbZb7gpzzAZ1pTfaUNDVlmA=
@@ -873,7 +869,6 @@ k8s.io/apiserver v0.18.6/go.mod h1:Zt2XvTHuaZjBz6EFYzpp+X4hTmgWGy8AthNVnTdm3Wg=
 k8s.io/apiserver v0.19.4/go.mod h1:X8WRHCR1UGZDd7HpV0QDc1h/6VbbpAeAGyxSh8yzZXw=
 k8s.io/client-go v0.17.0/go.mod h1:TYgR6EUHs6k45hb6KWjVD6jFZvJV4gHDikv/It0xz+k=
 k8s.io/client-go v0.18.6/go.mod h1:/fwtGLjYMS1MaM5oi+eXhKwG+1UHidUEXRh6cNsdO0Q=
-k8s.io/client-go v0.19.3 h1:ctqR1nQ52NUs6LpI0w+a5U+xjYwflFwA13OJKcicMxg=
 k8s.io/client-go v0.19.3/go.mod h1:+eEMktZM+MG0KO+PTkci8xnbCZHvj9TqR6Q1XDUIJOM=
 k8s.io/client-go v0.19.4 h1:85D3mDNoLF+xqpyE9Dh/OtrJDyJrSRKkHmDXIbEzer8=
 k8s.io/client-go v0.19.4/go.mod h1:ZrEy7+wj9PjH5VMBCuu/BDlvtUAku0oVFk4MmnW9mWA=
@@ -907,7 +902,6 @@ mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f/go.mod h1:4G1h5nDURzA3bwVMZI
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.7/go.mod h1:PHgbrJT7lCHcxMU+mDHEm+nx46H4zuuHZkDP6icnhu0=
 sigs.k8s.io/apiserver-network-proxy/konnectivity-client v0.0.9/go.mod h1:dzAXnQbTRyDlZPJX2SUPEqvnB+j7AJjtlox7PEwigU0=
-sigs.k8s.io/controller-runtime v0.6.3 h1:SBbr+inLPEKhvlJtrvDcwIpm+uhDvp63Bl72xYJtoOE=
 sigs.k8s.io/controller-runtime v0.6.3/go.mod h1:WlZNXcM0++oyaQt4B7C2lEE5JYRs8vJUzRP4N4JpdAY=
 sigs.k8s.io/controller-runtime v0.6.4 h1:4013CKsBs5bEqo+LevzDett+LLxag/FjQWG94nVZ/9g=
 sigs.k8s.io/controller-runtime v0.6.4/go.mod h1:WlZNXcM0++oyaQt4B7C2lEE5JYRs8vJUzRP4N4JpdAY=