Add test_build_squeeze.

tests/test_image.py

@@ -0,0 +1,58 @@
+import pytest
+from focker.image import validate_spec, \
+    build_squeeze
+import subprocess
+from tempfile import TemporaryDirectory
+import focker.image
+import os
+from focker.zfs import zfs_find, \
+    zfs_mountpoint
+from focker.misc import focker_unlock
+
+
+def test_validate_spec_01():
+    spec = { 'base': 'base', 'steps': 'steps' }
+    validate_spec(spec)
+
+
+def test_validate_spec_02():
+    spec = { 'steps': 'steps' }
+    with pytest.raises(ValueError):
+        validate_spec(spec)
+
+
+def test_validate_spec_03():
+    spec = { 'base': 'base' }
+    with pytest.raises(ValueError):
+        validate_spec(spec)
+
+
+def test_validate_spec_04():
+    spec = {}
+    with pytest.raises(ValueError):
+        validate_spec(spec)
+
+
+def test_build_squeeze(monkeypatch):
+    subprocess.check_output(['focker', 'image', 'remove', '--force', '-R', 'test-build-squeeze-base'])
+    subprocess.check_output(['focker', 'bootstrap', '--dry-run', '-t', 'test-build-squeeze-base'])
+    spec = dict(base='test-build-squeeze-base', steps=[
+        dict(copy=['/etc/localtime', '/etc/localtime']),
+        dict(copy=['/etc/hosts', '/etc/hosts'])
+    ])
+    _, base_sha256 = zfs_find('test-build-squeeze-base', focker_type='image')
+    def fail(sha256, *args, **kwargs):
+        if sha256 != base_sha256:
+            raise RuntimeError('No pre-existing layers expected apart from base')
+    monkeypatch.setattr(focker.image, 'zfs_snapshot_by_sha256', fail)
+    with TemporaryDirectory() as d:
+        args = lambda: 0
+        args.focker_dir = d
+        name, _ = build_squeeze(spec, args)
+    focker_unlock()
+    mountpoint = zfs_mountpoint(name.split('@')[0])
+    print('name:', name, 'mountpoint:', mountpoint)
+    assert os.path.exists(os.path.join(mountpoint, 'etc/localtime'))
+    assert os.path.exists(os.path.join(mountpoint, 'etc/hosts'))
+    subprocess.check_output(['focker', 'image', 'remove', '-R', 'test-build-squeeze-base'])
+    assert not os.path.exists(mountpoint)