Support Berkeley DB 6

tests/comparators/test_berkeley_db.py

@@ -16,18 +16,31 @@
 # You should have received a copy of the GNU General Public License
 # along with diffoscope.  If not, see <https://www.gnu.org/licenses/>.
 
+import subprocess
 import pytest
 
 from diffoscope.comparators.berkeley_db import BerkeleyDBFile
 
 from ..utils.data import load_fixture, assert_diff
-from ..utils.tools import skip_unless_tools_exist
+from ..utils.tools import (
+    skip_unless_tools_exist,
+    skip_unless_tool_is_at_least,
+    skip_unless_tool_is_at_most,
+)
 from ..utils.nonexisting import assert_non_existing
 
 db1 = load_fixture("test1.db")
 db2 = load_fixture("test2.db")
 
 
+def db_version():
+    try:
+        out = subprocess.check_output(["db_dump", "-V"])
+    except subprocess.CalledProcessError as e:
+        out = e.output
+    return out.decode("UTF-8").split()[2].replace(":", "")
+
+
 def test_identification(db1):
     assert isinstance(db1, BerkeleyDBFile)
 
@@ -43,10 +56,17 @@ def test_no_differences(db1):
 
 
 @skip_unless_tools_exist("db_dump")
+@skip_unless_tool_is_at_most("db_dump", db_version, "6.0")
 def test_diff(differences):
     assert_diff(differences[0], "berkeley_db_expected_diff")
 
 
+@skip_unless_tools_exist("db_dump")
+@skip_unless_tool_is_at_least("db_dump", db_version, "6.0")
+def test_diff6(differences):
+    assert_diff(differences[0], "berkeley6_db_expected_diff")
+
+
 @skip_unless_tools_exist("db_dump")
 def test_compare_non_existing(monkeypatch, db1):
     assert_non_existing(monkeypatch, db1, has_null_source=False)

tests/data/berkeley6_db_expected_diff

+@@ -9,31 +9,27 @@
+ 	magic: 0x53162
+ 	version: 9
+ 	pagesize: 4096
+ 	type: 9
+ 	metaflags 0
+ 	keys: 0	records: 0
+ 	free list: 0
+-	last_pgno: 7
++	last_pgno: 3
+ 	flags: 0x20 (multiple-databases)
+ 	minkey: 2
+ 	root: 1
+ 	blob_threshold: 0
+ 	blob_file_lo: 0
+ 	blob_file_hi: 0
+ 	blob_sdb_lo: 0
+ 	blob_sdb_hi: 0
+ page 1: btree leaf: LSN [0][1]: level 1
+-	prev:    0 next:    0 entries:    6 offset: 4000
+-	[000] 4040 len:  19 data: unstable|main|amd64
+-	[001] 4032 len:   4 data: 00000004
+-	[002] 4072 len:  18 data: unstable|main|i386
+-	[003] 4064 len:   4 data: 00000002
+-	[004] 4008 len:  20 data: unstable|main|source
+-	[005] 4000 len:   4 data: 00000006
++	prev:    0 next:    0 entries:    2 offset: 4064
++	[000] 4072 len:  19 data: compressedfilelists
++	[001] 4064 len:   4 data: 00000002
+ page 2: btree metadata: LSN [0][1]: level 0
+ 	magic: 0x53162
+ 	version: 9
+ 	pagesize: 4096
+ 	type: 9
+ 	metaflags 0
+ 	keys: 0	records: 0
+@@ -45,45 +41,7 @@
+ 	blob_threshold: 0
+ 	blob_file_lo: 0
+ 	blob_file_hi: 0
+ 	blob_sdb_lo: 0
+ 	blob_sdb_hi: 0
+ page 3: btree leaf: LSN [0][1]: level 1
+ 	prev:    0 next:    0 entries:    0 offset: 4096
+-page 4: btree metadata: LSN [0][1]: level 0
+-	magic: 0x53162
+-	version: 9
+-	pagesize: 4096
+-	type: 9
+-	metaflags 0
+-	keys: 0	records: 0
+-	free list: 0
+-	last_pgno: 4
+-	flags: 0x20 (multiple-databases)
+-	minkey: 2
+-	root: 5
+-	blob_threshold: 0
+-	blob_file_lo: 0
+-	blob_file_hi: 0
+-	blob_sdb_lo: 0
+-	blob_sdb_hi: 0
+-page 5: btree leaf: LSN [0][1]: level 1
+-	prev:    0 next:    0 entries:    0 offset: 4096
+-page 6: btree metadata: LSN [0][1]: level 0
+-	magic: 0x53162
+-	version: 9
+-	pagesize: 4096
+-	type: 9
+-	metaflags 0
+-	keys: 0	records: 0
+-	free list: 0
+-	last_pgno: 6
+-	flags: 0x20 (multiple-databases)
+-	minkey: 2
+-	root: 7
+-	blob_threshold: 0
+-	blob_file_lo: 0
+-	blob_file_hi: 0
+-	blob_sdb_lo: 0
+-	blob_sdb_hi: 0
+-page 7: btree leaf: LSN [0][1]: level 1
+-	prev:    0 next:    0 entries:    0 offset: 4096