tests: Use context manager for ArtifactShare

2 files changed, 426 insertions, 422 deletions

diff --git a/tests/frontend/pull.py b/tests/frontend/pull.py
index 9caf727ac..78c1f9cc2 100644
--- a/tests/frontend/pull.py
+++ b/tests/frontend/pull.py
@@ -46,38 +46,39 @@ def assert_not_shared(cli, share, project, element_name):
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_all(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-
-    # First build the target element and push to the remote.
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True}
-    })
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
-    assert cli.get_element_state(project, 'target.bst') == 'cached'
-
-    # Assert that everything is now cached in the remote.
-    all_elements = ['target.bst', 'import-bin.bst', 'import-dev.bst', 'compose-all.bst']
-    for element_name in all_elements:
-        assert_shared(cli, share, project, element_name)
-
-    # Now we've pushed, delete the user's local artifact cache
-    # directory and try to redownload it from the share
-    #
-    artifacts = os.path.join(cli.directory, 'artifacts')
-    shutil.rmtree(artifacts)
 
-    # Assert that nothing is cached locally anymore
-    for element_name in all_elements:
-        assert cli.get_element_state(project, element_name) != 'cached'
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+
+        # First build the target element and push to the remote.
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True}
+        })
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
+        assert cli.get_element_state(project, 'target.bst') == 'cached'
+
+        # Assert that everything is now cached in the remote.
+        all_elements = ['target.bst', 'import-bin.bst', 'import-dev.bst', 'compose-all.bst']
+        for element_name in all_elements:
+            assert_shared(cli, share, project, element_name)
+
+        # Now we've pushed, delete the user's local artifact cache
+        # directory and try to redownload it from the share
+        #
+        artifacts = os.path.join(cli.directory, 'artifacts')
+        shutil.rmtree(artifacts)
 
-    # Now try bst pull
-    result = cli.run(project=project, args=['pull', '--deps', 'all', 'target.bst'])
-    result.assert_success()
+        # Assert that nothing is cached locally anymore
+        for element_name in all_elements:
+            assert cli.get_element_state(project, element_name) != 'cached'
 
-    # And assert that it's again in the local cache, without having built
-    for element_name in all_elements:
-        assert cli.get_element_state(project, element_name) == 'cached'
+        # Now try bst pull
+        result = cli.run(project=project, args=['pull', '--deps', 'all', 'target.bst'])
+        result.assert_success()
+
+        # And assert that it's again in the local cache, without having built
+        for element_name in all_elements:
+            assert cli.get_element_state(project, element_name) == 'cached'
 
 
 # Tests that:
@@ -90,36 +91,36 @@ def test_push_pull_all(cli, tmpdir, datafiles):
 def test_pull_secondary_cache(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
 
-    share1 = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1'))
-    share2 = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2'))
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1')) as share1,\
+        create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2')) as share2:
 
-    # Build the target and push it to share2 only.
-    cli.configure({
-        'artifacts': [
-            {'url': share1.repo, 'push': False},
-            {'url': share2.repo, 'push': True},
-        ]
-    })
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
+        # Build the target and push it to share2 only.
+        cli.configure({
+            'artifacts': [
+                {'url': share1.repo, 'push': False},
+                {'url': share2.repo, 'push': True},
+            ]
+        })
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
 
-    assert_not_shared(cli, share1, project, 'target.bst')
-    assert_shared(cli, share2, project, 'target.bst')
+        assert_not_shared(cli, share1, project, 'target.bst')
+        assert_shared(cli, share2, project, 'target.bst')
 
-    # Delete the user's local artifact cache.
-    artifacts = os.path.join(cli.directory, 'artifacts')
-    shutil.rmtree(artifacts)
+        # Delete the user's local artifact cache.
+        artifacts = os.path.join(cli.directory, 'artifacts')
+        shutil.rmtree(artifacts)
 
-    # Assert that the element is not cached anymore.
-    assert cli.get_element_state(project, 'target.bst') != 'cached'
+        # Assert that the element is not cached anymore.
+        assert cli.get_element_state(project, 'target.bst') != 'cached'
 
-    # Now try bst pull
-    result = cli.run(project=project, args=['pull', 'target.bst'])
-    result.assert_success()
+        # Now try bst pull
+        result = cli.run(project=project, args=['pull', 'target.bst'])
+        result.assert_success()
 
-    # And assert that it's again in the local cache, without having built,
-    # i.e. we found it in share2.
-    assert cli.get_element_state(project, 'target.bst') == 'cached'
+        # And assert that it's again in the local cache, without having built,
+        # i.e. we found it in share2.
+        assert cli.get_element_state(project, 'target.bst') == 'cached'
 
 
 # Tests that:
@@ -132,45 +133,45 @@ def test_pull_secondary_cache(cli, tmpdir, datafiles):
 def test_push_pull_specific_remote(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
 
-    good_share = create_artifact_share(os.path.join(str(tmpdir), 'goodartifactshare'))
-    bad_share = create_artifact_share(os.path.join(str(tmpdir), 'badartifactshare'))
+    with create_artifact_share(os.path.join(str(tmpdir), 'goodartifactshare')) as good_share,\
+        create_artifact_share(os.path.join(str(tmpdir), 'badartifactshare')) as bad_share:
 
-    # Build the target so we have it cached locally only.
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
+        # Build the target so we have it cached locally only.
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
 
-    state = cli.get_element_state(project, 'target.bst')
-    assert state == 'cached'
+        state = cli.get_element_state(project, 'target.bst')
+        assert state == 'cached'
 
-    # Configure the default push location to be bad_share; we will assert that
-    # nothing actually gets pushed there.
-    cli.configure({
-        'artifacts': {'url': bad_share.repo, 'push': True},
-    })
+        # Configure the default push location to be bad_share; we will assert that
+        # nothing actually gets pushed there.
+        cli.configure({
+            'artifacts': {'url': bad_share.repo, 'push': True},
+        })
 
-    # Now try `bst push` to the good_share.
-    result = cli.run(project=project, args=[
-        'push', 'target.bst', '--remote', good_share.repo
-    ])
-    result.assert_success()
+        # Now try `bst push` to the good_share.
+        result = cli.run(project=project, args=[
+            'push', 'target.bst', '--remote', good_share.repo
+        ])
+        result.assert_success()
 
-    # Assert that all the artifacts are in the share we pushed
-    # to, and not the other.
-    assert_shared(cli, good_share, project, 'target.bst')
-    assert_not_shared(cli, bad_share, project, 'target.bst')
+        # Assert that all the artifacts are in the share we pushed
+        # to, and not the other.
+        assert_shared(cli, good_share, project, 'target.bst')
+        assert_not_shared(cli, bad_share, project, 'target.bst')
 
-    # Now we've pushed, delete the user's local artifact cache
-    # directory and try to redownload it from the good_share.
-    #
-    artifacts = os.path.join(cli.directory, 'artifacts')
-    shutil.rmtree(artifacts)
+        # Now we've pushed, delete the user's local artifact cache
+        # directory and try to redownload it from the good_share.
+        #
+        artifacts = os.path.join(cli.directory, 'artifacts')
+        shutil.rmtree(artifacts)
 
-    result = cli.run(project=project, args=['pull', 'target.bst', '--remote',
-                                            good_share.repo])
-    result.assert_success()
+        result = cli.run(project=project, args=['pull', 'target.bst', '--remote',
+                                                good_share.repo])
+        result.assert_success()
 
-    # And assert that it's again in the local cache, without having built
-    assert cli.get_element_state(project, 'target.bst') == 'cached'
+        # And assert that it's again in the local cache, without having built
+        assert cli.get_element_state(project, 'target.bst') == 'cached'
 
 
 # Tests that:
@@ -181,50 +182,51 @@ def test_push_pull_specific_remote(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_non_strict(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-    workspace = os.path.join(str(tmpdir), 'workspace')
-
-    # First build the target element and push to the remote.
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True},
-        'projects': {
-            'test': {'strict': False}
-        }
-    })
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
-    assert cli.get_element_state(project, 'target.bst') == 'cached'
-
-    # Assert that everything is now cached in the remote.
-    all_elements = ['target.bst', 'import-bin.bst', 'import-dev.bst', 'compose-all.bst']
-    for element_name in all_elements:
-        assert_shared(cli, share, project, element_name)
-
-    # Now we've pushed, delete the user's local artifact cache
-    # directory and try to redownload it from the share
-    #
-    artifacts = os.path.join(cli.directory, 'artifacts')
-    shutil.rmtree(artifacts)
 
-    # Assert that nothing is cached locally anymore
-    for element_name in all_elements:
-        assert cli.get_element_state(project, element_name) != 'cached'
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+        workspace = os.path.join(str(tmpdir), 'workspace')
 
-    # Add a file to force change in strict cache key of import-bin.bst
-    with open(os.path.join(str(project), 'files', 'bin-files', 'usr', 'bin', 'world'), 'w') as f:
-        f.write('world')
+        # First build the target element and push to the remote.
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True},
+            'projects': {
+                'test': {'strict': False}
+            }
+        })
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
+        assert cli.get_element_state(project, 'target.bst') == 'cached'
 
-    # Assert that the workspaced element requires a rebuild
-    assert cli.get_element_state(project, 'import-bin.bst') == 'buildable'
-    # Assert that the target is still waiting due to --no-strict
-    assert cli.get_element_state(project, 'target.bst') == 'waiting'
+        # Assert that everything is now cached in the remote.
+        all_elements = ['target.bst', 'import-bin.bst', 'import-dev.bst', 'compose-all.bst']
+        for element_name in all_elements:
+            assert_shared(cli, share, project, element_name)
 
-    # Now try bst pull
-    result = cli.run(project=project, args=['pull', '--deps', 'all', 'target.bst'])
-    result.assert_success()
+        # Now we've pushed, delete the user's local artifact cache
+        # directory and try to redownload it from the share
+        #
+        artifacts = os.path.join(cli.directory, 'artifacts')
+        shutil.rmtree(artifacts)
 
-    # And assert that the target is again in the local cache, without having built
-    assert cli.get_element_state(project, 'target.bst') == 'cached'
+        # Assert that nothing is cached locally anymore
+        for element_name in all_elements:
+            assert cli.get_element_state(project, element_name) != 'cached'
+
+        # Add a file to force change in strict cache key of import-bin.bst
+        with open(os.path.join(str(project), 'files', 'bin-files', 'usr', 'bin', 'world'), 'w') as f:
+            f.write('world')
+
+        # Assert that the workspaced element requires a rebuild
+        assert cli.get_element_state(project, 'import-bin.bst') == 'buildable'
+        # Assert that the target is still waiting due to --no-strict
+        assert cli.get_element_state(project, 'target.bst') == 'waiting'
+
+        # Now try bst pull
+        result = cli.run(project=project, args=['pull', '--deps', 'all', 'target.bst'])
+        result.assert_success()
+
+        # And assert that the target is again in the local cache, without having built
+        assert cli.get_element_state(project, 'target.bst') == 'cached'
 
 
 # Regression test for https://gitlab.com/BuildStream/buildstream/issues/202
@@ -232,71 +234,73 @@ def test_push_pull_non_strict(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_track_non_strict(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-
-    # First build the target element and push to the remote.
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True},
-        'projects': {
-            'test': {'strict': False}
-        }
-    })
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
-    assert cli.get_element_state(project, 'target.bst') == 'cached'
-
-    # Assert that everything is now cached in the remote.
-    all_elements = {'target.bst', 'import-bin.bst', 'import-dev.bst', 'compose-all.bst'}
-    for element_name in all_elements:
-        assert_shared(cli, share, project, element_name)
-
-    # Now we've pushed, delete the user's local artifact cache
-    # directory and try to redownload it from the share
-    #
-    artifacts = os.path.join(cli.directory, 'artifacts')
-    shutil.rmtree(artifacts)
-
-    # Assert that nothing is cached locally anymore
-    for element_name in all_elements:
-        assert cli.get_element_state(project, element_name) != 'cached'
 
-    # Now try bst build with tracking and pulling.
-    # Tracking will be skipped for target.bst as it doesn't have any sources.
-    # With the non-strict build plan target.bst immediately enters the pull queue.
-    # However, pulling has to be deferred until the dependencies have been
-    # tracked as the strict cache key needs to be calculated before querying
-    # the caches.
-    result = cli.run(project=project, args=['build', '--track-all', '--all', 'target.bst'])
-    result.assert_success()
-    assert set(result.get_pulled_elements()) == all_elements
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+
+        # First build the target element and push to the remote.
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True},
+            'projects': {
+                'test': {'strict': False}
+            }
+        })
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
+        assert cli.get_element_state(project, 'target.bst') == 'cached'
+
+        # Assert that everything is now cached in the remote.
+        all_elements = {'target.bst', 'import-bin.bst', 'import-dev.bst', 'compose-all.bst'}
+        for element_name in all_elements:
+            assert_shared(cli, share, project, element_name)
+
+        # Now we've pushed, delete the user's local artifact cache
+        # directory and try to redownload it from the share
+        #
+        artifacts = os.path.join(cli.directory, 'artifacts')
+        shutil.rmtree(artifacts)
+
+        # Assert that nothing is cached locally anymore
+        for element_name in all_elements:
+            assert cli.get_element_state(project, element_name) != 'cached'
+
+        # Now try bst build with tracking and pulling.
+        # Tracking will be skipped for target.bst as it doesn't have any sources.
+        # With the non-strict build plan target.bst immediately enters the pull queue.
+        # However, pulling has to be deferred until the dependencies have been
+        # tracked as the strict cache key needs to be calculated before querying
+        # the caches.
+        result = cli.run(project=project, args=['build', '--track-all', '--all', 'target.bst'])
+        result.assert_success()
+        assert set(result.get_pulled_elements()) == all_elements
 
 
 @pytest.mark.skipif(not IS_LINUX, reason='Only available on linux')
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_pull_cross_junction(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-    subproject_path = os.path.join(project, 'files', 'sub-project')
-    junction_path = os.path.join(project, 'elements', 'junction.bst')
 
-    generate_junction(tmpdir, subproject_path, junction_path, store_ref=True)
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+        subproject_path = os.path.join(project, 'files', 'sub-project')
+        junction_path = os.path.join(project, 'elements', 'junction.bst')
+
+        generate_junction(tmpdir, subproject_path, junction_path, store_ref=True)
 
-    # First build the target element and push to the remote.
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True}
-    })
-    result = cli.run(project=project, args=['build', 'junction.bst:import-etc.bst'])
-    result.assert_success()
-    assert cli.get_element_state(project, 'junction.bst:import-etc.bst') == 'cached'
+        # First build the target element and push to the remote.
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True}
+        })
+        result = cli.run(project=project, args=['build', 'junction.bst:import-etc.bst'])
+        result.assert_success()
+        assert cli.get_element_state(project, 'junction.bst:import-etc.bst') == 'cached'
 
-    cache_dir = os.path.join(project, 'cache', 'artifacts')
-    shutil.rmtree(cache_dir)
+        cache_dir = os.path.join(project, 'cache', 'artifacts')
+        shutil.rmtree(cache_dir)
 
-    assert cli.get_element_state(project, 'junction.bst:import-etc.bst') == 'buildable'
+        assert cli.get_element_state(project, 'junction.bst:import-etc.bst') == 'buildable'
 
-    # Now try bst pull
-    result = cli.run(project=project, args=['pull', 'junction.bst:import-etc.bst'])
-    result.assert_success()
+        # Now try bst pull
+        result = cli.run(project=project, args=['pull', 'junction.bst:import-etc.bst'])
+        result.assert_success()
 
-    # And assert that it's again in the local cache, without having built
-    assert cli.get_element_state(project, 'junction.bst:import-etc.bst') == 'cached'
+        # And assert that it's again in the local cache, without having built
+        assert cli.get_element_state(project, 'junction.bst:import-etc.bst') == 'cached'
diff --git a/tests/frontend/push.py b/tests/frontend/push.py
index 5cd88290d..8dba3c0a3 100644
--- a/tests/frontend/push.py
+++ b/tests/frontend/push.py
@@ -1,5 +1,4 @@
 import os
-import shutil
 import pytest
 from collections import namedtuple
 from unittest.mock import MagicMock
@@ -59,47 +58,47 @@ def test_push(cli, tmpdir, datafiles):
     assert cli.get_element_state(project, 'target.bst') == 'cached'
 
     # Set up two artifact shares.
-    share1 = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1'))
-    share2 = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2'))
-
-    # Try pushing with no remotes configured. This should fail.
-    result = cli.run(project=project, args=['push', 'target.bst'])
-    result.assert_main_error(ErrorDomain.STREAM, None)
-
-    # Configure bst to pull but not push from a cache and run `bst push`.
-    # This should also fail.
-    cli.configure({
-        'artifacts': {'url': share1.repo, 'push': False},
-    })
-    result = cli.run(project=project, args=['push', 'target.bst'])
-    result.assert_main_error(ErrorDomain.STREAM, None)
-
-    # Configure bst to push to one of the caches and run `bst push`. This works.
-    cli.configure({
-        'artifacts': [
-            {'url': share1.repo, 'push': False},
-            {'url': share2.repo, 'push': True},
-        ]
-    })
-    result = cli.run(project=project, args=['push', 'target.bst'])
-
-    assert_not_shared(cli, share1, project, 'target.bst')
-    assert_shared(cli, share2, project, 'target.bst')
-
-    # Now try pushing to both (making sure to empty the cache we just pushed
-    # to).
-    shutil.rmtree(share2.directory)
-    share2 = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2'))
-    cli.configure({
-        'artifacts': [
-            {'url': share1.repo, 'push': True},
-            {'url': share2.repo, 'push': True},
-        ]
-    })
-    result = cli.run(project=project, args=['push', 'target.bst'])
-
-    assert_shared(cli, share1, project, 'target.bst')
-    assert_shared(cli, share2, project, 'target.bst')
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1')) as share1:
+
+        with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2')) as share2:
+
+            # Try pushing with no remotes configured. This should fail.
+            result = cli.run(project=project, args=['push', 'target.bst'])
+            result.assert_main_error(ErrorDomain.STREAM, None)
+
+            # Configure bst to pull but not push from a cache and run `bst push`.
+            # This should also fail.
+            cli.configure({
+                'artifacts': {'url': share1.repo, 'push': False},
+            })
+            result = cli.run(project=project, args=['push', 'target.bst'])
+            result.assert_main_error(ErrorDomain.STREAM, None)
+
+            # Configure bst to push to one of the caches and run `bst push`. This works.
+            cli.configure({
+                'artifacts': [
+                    {'url': share1.repo, 'push': False},
+                    {'url': share2.repo, 'push': True},
+                ]
+            })
+            result = cli.run(project=project, args=['push', 'target.bst'])
+
+            assert_not_shared(cli, share1, project, 'target.bst')
+            assert_shared(cli, share2, project, 'target.bst')
+
+        # Now try pushing to both
+
+        with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2')) as share2:
+            cli.configure({
+                'artifacts': [
+                    {'url': share1.repo, 'push': True},
+                    {'url': share2.repo, 'push': True},
+                ]
+            })
+            result = cli.run(project=project, args=['push', 'target.bst'])
+
+            assert_shared(cli, share1, project, 'target.bst')
+            assert_shared(cli, share2, project, 'target.bst')
 
 
 # Tests that `bst push --deps all` pushes all dependencies of the given element.
@@ -108,46 +107,47 @@ def test_push(cli, tmpdir, datafiles):
 @pytest.mark.datafiles(DATA_DIR)
 def test_push_all(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
 
-    # First build it without the artifact cache configured
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
-
-    # Assert that we are now cached locally
-    assert cli.get_element_state(project, 'target.bst') == 'cached'
-
-    # Configure artifact share
-    cli.configure({
-        #
-        # FIXME: This test hangs "sometimes" if we allow
-        #        concurrent push.
-        #
-        #        It's not too bad to ignore since we're
-        #        using the local artifact cache functionality
-        #        only, but it should probably be fixed.
-        #
-        'scheduler': {
-            'pushers': 1
-        },
-        'artifacts': {
-            'url': share.repo,
-            'push': True,
-        }
-    })
-
-    # Now try bst push all the deps
-    result = cli.run(project=project, args=[
-        'push', 'target.bst',
-        '--deps', 'all'
-    ])
-    result.assert_success()
-
-    # And finally assert that all the artifacts are in the share
-    assert_shared(cli, share, project, 'target.bst')
-    assert_shared(cli, share, project, 'import-bin.bst')
-    assert_shared(cli, share, project, 'import-dev.bst')
-    assert_shared(cli, share, project, 'compose-all.bst')
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+
+        # First build it without the artifact cache configured
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
+
+        # Assert that we are now cached locally
+        assert cli.get_element_state(project, 'target.bst') == 'cached'
+
+        # Configure artifact share
+        cli.configure({
+            #
+            # FIXME: This test hangs "sometimes" if we allow
+            #        concurrent push.
+            #
+            #        It's not too bad to ignore since we're
+            #        using the local artifact cache functionality
+            #        only, but it should probably be fixed.
+            #
+            'scheduler': {
+                'pushers': 1
+            },
+            'artifacts': {
+                'url': share.repo,
+                'push': True,
+            }
+        })
+
+        # Now try bst push all the deps
+        result = cli.run(project=project, args=[
+            'push', 'target.bst',
+            '--deps', 'all'
+        ])
+        result.assert_success()
+
+        # And finally assert that all the artifacts are in the share
+        assert_shared(cli, share, project, 'target.bst')
+        assert_shared(cli, share, project, 'import-bin.bst')
+        assert_shared(cli, share, project, 'import-dev.bst')
+        assert_shared(cli, share, project, 'compose-all.bst')
 
 
 # Tests that `bst build` won't push artifacts to the cache it just pulled from.
@@ -159,47 +159,47 @@ def test_push_after_pull(cli, tmpdir, datafiles):
     project = os.path.join(datafiles.dirname, datafiles.basename)
 
     # Set up two artifact shares.
-    share1 = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1'))
-    share2 = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2'))
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare1')) as share1,\
+        create_artifact_share(os.path.join(str(tmpdir), 'artifactshare2')) as share2:
 
-    # Set the scene: share1 has the artifact, share2 does not.
-    #
-    cli.configure({
-        'artifacts': {'url': share1.repo, 'push': True},
-    })
+        # Set the scene: share1 has the artifact, share2 does not.
+        #
+        cli.configure({
+            'artifacts': {'url': share1.repo, 'push': True},
+        })
 
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
 
-    cli.remove_artifact_from_cache(project, 'target.bst')
+        cli.remove_artifact_from_cache(project, 'target.bst')
 
-    assert_shared(cli, share1, project, 'target.bst')
-    assert_not_shared(cli, share2, project, 'target.bst')
-    assert cli.get_element_state(project, 'target.bst') != 'cached'
+        assert_shared(cli, share1, project, 'target.bst')
+        assert_not_shared(cli, share2, project, 'target.bst')
+        assert cli.get_element_state(project, 'target.bst') != 'cached'
 
-    # Now run the build again. Correct `bst build` behaviour is to download the
-    # artifact from share1 but not push it back again.
-    #
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
-    assert result.get_pulled_elements() == ['target.bst']
-    assert result.get_pushed_elements() == []
-
-    # Delete the artifact locally again.
-    cli.remove_artifact_from_cache(project, 'target.bst')
-
-    # Now we add share2 into the mix as a second push remote. This time,
-    # `bst build` should push to share2 after pulling from share1.
-    cli.configure({
-        'artifacts': [
-            {'url': share1.repo, 'push': True},
-            {'url': share2.repo, 'push': True},
-        ]
-    })
-    result = cli.run(project=project, args=['build', 'target.bst'])
-    result.assert_success()
-    assert result.get_pulled_elements() == ['target.bst']
-    assert result.get_pushed_elements() == ['target.bst']
+        # Now run the build again. Correct `bst build` behaviour is to download the
+        # artifact from share1 but not push it back again.
+        #
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
+        assert result.get_pulled_elements() == ['target.bst']
+        assert result.get_pushed_elements() == []
+
+        # Delete the artifact locally again.
+        cli.remove_artifact_from_cache(project, 'target.bst')
+
+        # Now we add share2 into the mix as a second push remote. This time,
+        # `bst build` should push to share2 after pulling from share1.
+        cli.configure({
+            'artifacts': [
+                {'url': share1.repo, 'push': True},
+                {'url': share2.repo, 'push': True},
+            ]
+        })
+        result = cli.run(project=project, args=['build', 'target.bst'])
+        result.assert_success()
+        assert result.get_pulled_elements() == ['target.bst']
+        assert result.get_pushed_elements() == ['target.bst']
 
 
 # Ensure that when an artifact's size exceeds available disk space
@@ -211,54 +211,54 @@ def test_artifact_expires(cli, datafiles, tmpdir):
     element_path = os.path.join(project, 'elements')
 
     # Create an artifact share (remote artifact cache) in the tmpdir/artifactshare
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-
-    # Mock the os.statvfs() call to return a named tuple which emulates an
-    # os.statvfs_result object
-    statvfs_result = namedtuple('statvfs_result', 'f_blocks f_bfree f_bsize')
-    os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(10e9),
-                                                       f_bfree=(int(12e6) + int(2e9)),
-                                                       f_bsize=1))
-
-    # Configure bst to push to the cache
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True},
-    })
-
-    # Create and build an element of 5 MB
-    create_element_size('element1.bst', element_path, [], int(5e6))  # [] => no deps
-    result = cli.run(project=project, args=['build', 'element1.bst'])
-    result.assert_success()
-
-    # Create and build an element of 5 MB
-    create_element_size('element2.bst', element_path, [], int(5e6))  # [] => no deps
-    result = cli.run(project=project, args=['build', 'element2.bst'])
-    result.assert_success()
-
-    # check that element's 1 and 2 are cached both locally and remotely
-    assert cli.get_element_state(project, 'element1.bst') == 'cached'
-    assert_shared(cli, share, project, 'element1.bst')
-    assert cli.get_element_state(project, 'element2.bst') == 'cached'
-    assert_shared(cli, share, project, 'element2.bst')
-
-    # update mocked available disk space now that two 5 MB artifacts have been added
-    os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(10e9),
-                                                       f_bfree=(int(2e6) + int(2e9)),
-                                                       f_bsize=1))
-
-    # Create and build another element of 5 MB (This will exceed the free disk space available)
-    create_element_size('element3.bst', element_path, [], int(5e6))
-    result = cli.run(project=project, args=['build', 'element3.bst'])
-    result.assert_success()
-
-    # Ensure it is cached both locally and remotely
-    assert cli.get_element_state(project, 'element3.bst') == 'cached'
-    assert_shared(cli, share, project, 'element3.bst')
-
-    # Ensure element1 has been removed from the share
-    assert_not_shared(cli, share, project, 'element1.bst')
-    # Ensure that elemen2 remains
-    assert_shared(cli, share, project, 'element2.bst')
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+
+        # Mock the os.statvfs() call to return a named tuple which emulates an
+        # os.statvfs_result object
+        statvfs_result = namedtuple('statvfs_result', 'f_blocks f_bfree f_bsize')
+        os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(10e9),
+                                                           f_bfree=(int(12e6) + int(2e9)),
+                                                           f_bsize=1))
+
+        # Configure bst to push to the cache
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True},
+        })
+
+        # Create and build an element of 5 MB
+        create_element_size('element1.bst', element_path, [], int(5e6))  # [] => no deps
+        result = cli.run(project=project, args=['build', 'element1.bst'])
+        result.assert_success()
+
+        # Create and build an element of 5 MB
+        create_element_size('element2.bst', element_path, [], int(5e6))  # [] => no deps
+        result = cli.run(project=project, args=['build', 'element2.bst'])
+        result.assert_success()
+
+        # check that element's 1 and 2 are cached both locally and remotely
+        assert cli.get_element_state(project, 'element1.bst') == 'cached'
+        assert_shared(cli, share, project, 'element1.bst')
+        assert cli.get_element_state(project, 'element2.bst') == 'cached'
+        assert_shared(cli, share, project, 'element2.bst')
+
+        # update mocked available disk space now that two 5 MB artifacts have been added
+        os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(10e9),
+                                                           f_bfree=(int(2e6) + int(2e9)),
+                                                           f_bsize=1))
+
+        # Create and build another element of 5 MB (This will exceed the free disk space available)
+        create_element_size('element3.bst', element_path, [], int(5e6))
+        result = cli.run(project=project, args=['build', 'element3.bst'])
+        result.assert_success()
+
+        # Ensure it is cached both locally and remotely
+        assert cli.get_element_state(project, 'element3.bst') == 'cached'
+        assert_shared(cli, share, project, 'element3.bst')
+
+        # Ensure element1 has been removed from the share
+        assert_not_shared(cli, share, project, 'element1.bst')
+        # Ensure that elemen2 remains
+        assert_shared(cli, share, project, 'element2.bst')
 
 
 # Test that a large artifact, whose size exceeds the quota, is not pushed
@@ -269,36 +269,36 @@ def test_artifact_too_large(cli, datafiles, tmpdir):
     element_path = os.path.join(project, 'elements')
 
     # Create an artifact share (remote cache) in tmpdir/artifactshare
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-
-    # Mock a file system with 5 MB total space
-    statvfs_result = namedtuple('statvfs_result', 'f_blocks f_bfree f_bsize')
-    os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(5e6) + int(2e9),
-                                                       f_bfree=(int(5e6) + int(2e9)),
-                                                       f_bsize=1))
-
-    # Configure bst to push to the remote cache
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True},
-    })
-
-    # Create and push a 3MB element
-    create_element_size('small_element.bst', element_path, [], int(3e6))
-    result = cli.run(project=project, args=['build', 'small_element.bst'])
-    result.assert_success()
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
 
-    # Create and try to push a 6MB element.
-    create_element_size('large_element.bst', element_path, [], int(6e6))
-    result = cli.run(project=project, args=['build', 'large_element.bst'])
-    result.assert_success()
+        # Mock a file system with 5 MB total space
+        statvfs_result = namedtuple('statvfs_result', 'f_blocks f_bfree f_bsize')
+        os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(5e6) + int(2e9),
+                                                           f_bfree=(int(5e6) + int(2e9)),
+                                                           f_bsize=1))
+
+        # Configure bst to push to the remote cache
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True},
+        })
 
-    # Ensure that the small artifact is still in the share
-    assert cli.get_element_state(project, 'small_element.bst') == 'cached'
-    assert_shared(cli, share, project, 'small_element.bst')
+        # Create and push a 3MB element
+        create_element_size('small_element.bst', element_path, [], int(3e6))
+        result = cli.run(project=project, args=['build', 'small_element.bst'])
+        result.assert_success()
 
-    # Ensure that the artifact is cached locally but NOT remotely
-    assert cli.get_element_state(project, 'large_element.bst') == 'cached'
-    assert_not_shared(cli, share, project, 'large_element.bst')
+        # Create and try to push a 6MB element.
+        create_element_size('large_element.bst', element_path, [], int(6e6))
+        result = cli.run(project=project, args=['build', 'large_element.bst'])
+        result.assert_success()
+
+        # Ensure that the small artifact is still in the share
+        assert cli.get_element_state(project, 'small_element.bst') == 'cached'
+        assert_shared(cli, share, project, 'small_element.bst')
+
+        # Ensure that the artifact is cached locally but NOT remotely
+        assert cli.get_element_state(project, 'large_element.bst') == 'cached'
+        assert_not_shared(cli, share, project, 'large_element.bst')
 
 
 # Test that when an element is pulled recently, it is not considered the LRU element.
@@ -312,60 +312,60 @@ def test_recently_pulled_artifact_does_not_expire(cli, datafiles, tmpdir):
     element_path = os.path.join(project, 'elements')
 
     # Create an artifact share (remote cache) in tmpdir/artifactshare
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-
-    # Mock a file system with 12 MB free disk space
-    statvfs_result = namedtuple('statvfs_result', 'f_blocks f_bfree f_bsize')
-    os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(10e9) + int(2e9),
-                                                       f_bfree=(int(12e6) + int(2e9)),
-                                                       f_bsize=1))
-
-    # Configure bst to push to the cache
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True},
-    })
-
-    # Create and build 2 elements, each of 5 MB.
-    create_element_size('element1.bst', element_path, [], int(5e6))
-    result = cli.run(project=project, args=['build', 'element1.bst'])
-    result.assert_success()
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
 
-    create_element_size('element2.bst', element_path, [], int(5e6))
-    result = cli.run(project=project, args=['build', 'element2.bst'])
-    result.assert_success()
+        # Mock a file system with 12 MB free disk space
+        statvfs_result = namedtuple('statvfs_result', 'f_blocks f_bfree f_bsize')
+        os.statvfs = MagicMock(return_value=statvfs_result(f_blocks=int(10e9) + int(2e9),
+                                                           f_bfree=(int(12e6) + int(2e9)),
+                                                           f_bsize=1))
 
-    # Ensure they are cached locally
-    assert cli.get_element_state(project, 'element1.bst') == 'cached'
-    assert cli.get_element_state(project, 'element2.bst') == 'cached'
+        # Configure bst to push to the cache
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True},
+        })
 
-    # Ensure that they have  been pushed to the cache
-    assert_shared(cli, share, project, 'element1.bst')
-    assert_shared(cli, share, project, 'element2.bst')
+        # Create and build 2 elements, each of 5 MB.
+        create_element_size('element1.bst', element_path, [], int(5e6))
+        result = cli.run(project=project, args=['build', 'element1.bst'])
+        result.assert_success()
 
-    # Remove element1 from the local cache
-    cli.remove_artifact_from_cache(project, 'element1.bst')
-    assert cli.get_element_state(project, 'element1.bst') != 'cached'
+        create_element_size('element2.bst', element_path, [], int(5e6))
+        result = cli.run(project=project, args=['build', 'element2.bst'])
+        result.assert_success()
 
-    # Pull the element1 from the remote cache (this should update its mtime)
-    result = cli.run(project=project, args=['pull', 'element1.bst', '--remote',
-                                            share.repo])
-    result.assert_success()
+        # Ensure they are cached locally
+        assert cli.get_element_state(project, 'element1.bst') == 'cached'
+        assert cli.get_element_state(project, 'element2.bst') == 'cached'
 
-    # Ensure element1 is cached locally
-    assert cli.get_element_state(project, 'element1.bst') == 'cached'
+        # Ensure that they have  been pushed to the cache
+        assert_shared(cli, share, project, 'element1.bst')
+        assert_shared(cli, share, project, 'element2.bst')
 
-    # Create and build the element3 (of 5 MB)
-    create_element_size('element3.bst', element_path, [], int(5e6))
-    result = cli.run(project=project, args=['build', 'element3.bst'])
-    result.assert_success()
+        # Remove element1 from the local cache
+        cli.remove_artifact_from_cache(project, 'element1.bst')
+        assert cli.get_element_state(project, 'element1.bst') != 'cached'
+
+        # Pull the element1 from the remote cache (this should update its mtime)
+        result = cli.run(project=project, args=['pull', 'element1.bst', '--remote',
+                                                share.repo])
+        result.assert_success()
+
+        # Ensure element1 is cached locally
+        assert cli.get_element_state(project, 'element1.bst') == 'cached'
+
+        # Create and build the element3 (of 5 MB)
+        create_element_size('element3.bst', element_path, [], int(5e6))
+        result = cli.run(project=project, args=['build', 'element3.bst'])
+        result.assert_success()
 
-    # Make sure it's cached locally and remotely
-    assert cli.get_element_state(project, 'element3.bst') == 'cached'
-    assert_shared(cli, share, project, 'element3.bst')
+        # Make sure it's cached locally and remotely
+        assert cli.get_element_state(project, 'element3.bst') == 'cached'
+        assert_shared(cli, share, project, 'element3.bst')
 
-    # Ensure that element2 was deleted from the share and element1 remains
-    assert_not_shared(cli, share, project, 'element2.bst')
-    assert_shared(cli, share, project, 'element1.bst')
+        # Ensure that element2 was deleted from the share and element1 remains
+        assert_not_shared(cli, share, project, 'element2.bst')
+        assert_shared(cli, share, project, 'element1.bst')
 
 
 @pytest.mark.datafiles(DATA_DIR)
@@ -381,11 +381,11 @@ def test_push_cross_junction(cli, tmpdir, datafiles):
 
     assert cli.get_element_state(project, 'junction.bst:import-etc.bst') == 'cached'
 
-    share = create_artifact_share(os.path.join(str(tmpdir), 'artifactshare'))
-    cli.configure({
-        'artifacts': {'url': share.repo, 'push': True},
-    })
-    result = cli.run(project=project, args=['push', 'junction.bst:import-etc.bst'])
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+        cli.configure({
+            'artifacts': {'url': share.repo, 'push': True},
+        })
+        result = cli.run(project=project, args=['push', 'junction.bst:import-etc.bst'])
 
-    cache_key = cli.get_element_key(project, 'junction.bst:import-etc.bst')
-    assert share.has_artifact('subtest', 'import-etc.bst', cache_key)
+        cache_key = cli.get_element_key(project, 'junction.bst:import-etc.bst')
+        assert share.has_artifact('subtest', 'import-etc.bst', cache_key)