Problem with consuming cross-cell dependencies

Created by: davido

When replacing a cell with command line config option, dependencies are not seen in primary cell:

 $ buck build --config repositories.jgit=../jgit gerrit-pgm:http
com/google/gerrit/pgm/http/jetty/JettyServer.java:58: error:
package org.eclipse.jgit.lib does not exist
import org.eclipse.jgit.lib.Config;

This is strange, as the dependency is set correctly and is wokring, when internal jgit cell (inside gerrit) is used, without routing the jgit cell through standalone JGit development tree:

$ buck targets --json gerrit-pgm:http
[+] PROCESSING BUCK FILES...0,6s
[
{
  "annotationProcessorDeps" : [ ],
  "annotationProcessorOnly" : null,
  "annotationProcessorParams" : [ ],
  "annotationProcessors" : [ ],
  "buck.base_path" : "gerrit-pgm",
  "buck.direct_dependencies" : [ "//:jgit", "//gerrit-common:server", "//gerrit-extension-api:api", "//gerrit-gwtexpui:linker_server", "//gerrit-gwtexpui:server", "//gerrit-httpd:httpd", "//gerrit-reviewdb:server", "//gerrit-server:server", "//gerrit-sshd:sshd", "//lib:guava", "//lib/guice:guice", "//lib/guice:guice-assistedinject", "//lib/guice:guice-servlet", "//lib/jetty:jmx", "//lib/jetty:server", "//lib/jetty:servlet", "//lib/log:api", "//lib/log:jsonevent-layout", "//lib/log:log4j", "//gerrit-pgm:http-jetty" ],
  "buck.type" : "java_library",
  "compiler" : null,
  "deps" : [ "//gerrit-common:server", "//gerrit-extension-api:api", "//gerrit-gwtexpui:linker_server", "//gerrit-gwtexpui:server", "//gerrit-httpd:httpd", "//gerrit-server:server", "//gerrit-sshd:sshd", "//lib:guava", "//lib/guice:guice", "//lib/guice:guice-assistedinject", "//lib/guice:guice-servlet", "//lib/log:api", "//lib/log:log4j", "@jgit//:jgit", "//gerrit-reviewdb:server", "//lib/log:jsonevent-layout", "//lib/jetty:jmx", "//lib/jetty:server", "//lib/jetty:servlet" ],
  "exportedDeps" : [ ":http-jetty" ],
  "extraArguments" : [ "-encoding", "UTF-8" ],
  "javaVersion" : null,
  "javac" : null,
  "javacJar" : null,
  "mavenCoords" : null,
  "name" : "http",
  "postprocessClassesCommands" : [ ],
  "proguardConfig" : null,
  "providedDeps" : [ ],
  "resources" : [ ],
  "resourcesRoot" : null,
  "source" : null,
  "srcs" : [ ],
  "target" : null,
  "tests" : [ ],
  "visibility" : [ "//gerrit-war:" ]
}
]

Note, that //:jgit is java_library() in JGit cell:

java_library(
  name = 'jgit',
  exported_deps = ['//org.eclipse.jgit:jgit'],
  visibility = ['PUBLIC'],
)

And the actual build implementation is in jgit cell in org.eclipse.jgit/BUCK:

SRCS = glob(['src/**'])
RESOURCES = glob(['resources/**'])

java_library(
  name = 'jgit',
  srcs = SRCS,
  resources = RESOURCES,
  deps = [
    '//lib:javaewah',
    '//lib:jsch',
    '//lib:httpcomponents',
    '//lib:slf4j-api',
  ],
  visibility = ['PUBLIC'],
)

To reproduce, fetch JGit Buck build implementation: [1] and Gerrit cross-cell support patch for JGit: [2], and issue:

  $ cd gerrit
  $ buck build  gerrit-pgm:http
  [-] PROCESSING BUCK FILES...FINISHED 0,2s [100%]
  $ buck build --config repositories.jgit=../jgit gerrit-pgm:http
  <error: jgit content from secondary cell is not available>

[1] https://git.eclipse.org/r/61938 [2] https://gerrit-review.googlesource.com/73000