Seed jobs can not clone repositories which contain lfs files.

We now add GitLFS pull after checkout behaviour in order to support also repositories which are relying on Git LFS.

Closes jenkinsci#482

go.sum

@@ -212,6 +212,7 @@ github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96 h1:cenwrSVm+Z7QL
 github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
 github.com/docker/spdystream v0.0.0-20181023171402-6480d4af844c h1:ZfSZ3P3BedhKGUhzj7BQlPSU4OvT6tfOKe3DVHzOA7s=
 github.com/docker/spdystream v0.0.0-20181023171402-6480d4af844c/go.mod h1:Qh8CwZgvJUkLughtfhJv5dyTYa91l1fOUCrgjqmcifM=
+github.com/docopt/docopt-go v0.0.0-20141128170934-854c423c8108/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
 github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
@@ -668,6 +669,7 @@ github.com/ncw/swift v1.0.47/go.mod h1:23YIA4yWVnGwv2dQlN4bB7egfYX6YLn0Yo/S6zZO/
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/oklog/run v1.0.0/go.mod h1:dlhp/R75TPv97u0XWUtDeV/lRKWPKSdTuV0TZvrmrQA=
 github.com/oklog/ulid v1.3.1/go.mod h1:CirwcVhetQ6Lv90oh/F+FBtV6XMibvdAFo93nm5qn4U=
+github.com/olekukonko/tablewriter v0.0.0-20150822215231-b9346ac189c5/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
 github.com/onsi/ginkgo v1.4.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
@@ -858,6 +860,7 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.2.0 h1:Hbg2NidpLE8veEBkEZTL3CvlkUIVzuU9jDplZO54c48=
 github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v1.1.4-0.20160615092844-d77da356e56a/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=

pkg/configuration/user/seedjobs/seedjobs.go

@@ -79,6 +79,7 @@ import hudson.plugins.git.BranchSpec;
 import hudson.plugins.git.GitSCM;
 import hudson.plugins.git.SubmoduleConfig;
 import hudson.plugins.git.extensions.impl.CloneOption;
+import hudson.plugins.git.extensions.impl.GitLFSPull;
 import javaposse.jobdsl.plugin.ExecuteDslScripts;
 import javaposse.jobdsl.plugin.LookupStrategy;
 import javaposse.jobdsl.plugin.RemovedJobAction;
@@ -92,7 +93,10 @@ def jobDslSeedName = "{{ .ID }}-{{ .SeedJobSuffix }}";
 def jobRef = jenkins.getItem(jobDslSeedName)
 
 def repoList = GitSCM.createRepoList("{{ .RepositoryURL }}", "{{ .CredentialID }}")
-def gitExtensions = [new CloneOption(true, true, ";", 10)]
+def gitExtensions = [
+	new CloneOption(true, true, ";", 10),
+	new GitLFSPull()
+]
 def scm = new GitSCM(
         repoList,
         newArrayList(new BranchSpec("{{ .RepositoryBranch }}")),