make BORG_EXIT_CODES="modern" the default.

docs/usage/general/environment.rst.inc

@@ -38,7 +38,8 @@ General:
         When set, use the value to answer the "display the passphrase for verification" question when defining a new passphrase for encrypted repositories.
     BORG_EXIT_CODES
         When set to "modern", the borg process will return more specific exit codes (rc).
-        Default is "legacy" and returns rc 2 for all errors, 1 for all warnings, 0 for success.
+        When set to "legacy", the borg process will return rc 2 for all errors, 1 for all warnings, 0 for success.
+        Default is "modern".
     BORG_HOST_ID
         Borg usually computes a host id from the FQDN plus the results of ``uuid.getnode()`` (which usually returns
         a unique id based on the MAC address of the network interface. Except if that MAC happens to be all-zero - in

src/borg/helpers/errors.py

@@ -5,7 +5,7 @@
 from ..crypto.low_level import IntegrityError as IntegrityErrorBase
 
 
-modern_ec = os.environ.get("BORG_EXIT_CODES", "legacy") == "modern"
+modern_ec = os.environ.get("BORG_EXIT_CODES", "modern") == "modern"  # "legacy" was used by borg < 2
 
 
 class ErrorBase(Exception):

src/borg/testsuite/archiver/create_cmd.py

@@ -17,7 +17,7 @@
 from ...manifest import Manifest
 from ...platform import is_cygwin, is_win32, is_darwin
 from ...repository import Repository
-from ...helpers import CommandError
+from ...helpers import CommandError, BackupPermissionError
 from .. import has_lchflags
 from .. import changedir
 from .. import (
@@ -304,6 +304,9 @@ def test_create_no_permission_file(archivers, request):
         os.chmod(file_path + "2", 0o000)
     cmd(archiver, "rcreate", RK_ENCRYPTION)
     flist = "".join(f"input/file{n}\n" for n in range(1, 4))
+    expected_ec = BackupPermissionError("open", OSError(13, "permission denied")).exit_code
+    if expected_ec == EXIT_ERROR:  # workaround, TODO: fix it
+        expected_ec = EXIT_WARNING
     out = cmd(
         archiver,
         "create",
@@ -311,7 +314,7 @@ def test_create_no_permission_file(archivers, request):
         "--list",
         "test",
         input=flist.encode(),
-        exit_code=1,  # WARNING status: could not back up file2.
+        exit_code=expected_ec,  # WARNING status: could not back up file2.
     )
     assert "retry: 1 of " not in out  # retries were NOT attempted!
     assert "E input/file2" in out  # no permissions!

src/borg/testsuite/archiver/extract_cmd.py

@@ -9,7 +9,7 @@
 from ... import xattr
 from ...chunker import has_seek_hole
 from ...constants import *  # NOQA
-from ...helpers import EXIT_WARNING
+from ...helpers import EXIT_WARNING, BackupOSError
 from ...helpers import flags_noatime, flags_normal
 from .. import changedir, same_ts_ns
 from .. import are_symlinks_supported, are_hardlinks_supported, is_utime_fully_supported, is_birthtime_fully_supported
@@ -621,8 +621,11 @@ def test_overwrite(archivers, request):
     os.unlink("output/input/file1")
     os.mkdir("output/input/file1")
     os.mkdir("output/input/file1/dir")
+    expected_ec = BackupOSError("open", OSError(21, "is a directory")).exit_code  # WARNING code
+    if expected_ec == EXIT_ERROR:  # workaround, TODO: fix it
+        expected_ec = EXIT_WARNING
     with changedir("output"):
-        cmd(archiver, "extract", "test", exit_code=1)
+        cmd(archiver, "extract", "test", exit_code=expected_ec)
 
 
 # derived from test_extract_xattrs_errors()

src/borg/testsuite/archiver/lock_cmds.py

@@ -2,6 +2,7 @@
 
 from ...constants import *  # NOQA
 from . import cmd, generate_archiver_tests, RK_ENCRYPTION
+from ...helpers import CommandError
 
 pytest_generate_tests = lambda metafunc: generate_archiver_tests(metafunc, kinds="local,remote,binary")  # NOQA
 
@@ -24,4 +25,5 @@ def test_with_lock_non_existent_command(archivers, request):
     archiver = request.getfixturevalue(archivers)
     cmd(archiver, "rcreate", RK_ENCRYPTION)
     command = ["non_existent_command"]
-    cmd(archiver, "with-lock", *command, fork=True, exit_code=EXIT_ERROR)
+    expected_ec = CommandError().exit_code
+    cmd(archiver, "with-lock", *command, fork=True, exit_code=expected_ec)

src/borg/testsuite/archiver/return_codes.py

@@ -1,4 +1,6 @@
+from ...archive import Archive
 from ...constants import *  # NOQA
+from ...helpers import IncludePatternNeverMatchedWarning
 from . import cmd_fixture, changedir  # NOQA
 
 
@@ -15,6 +17,6 @@ def test_return_codes(cmd_fixture, tmpdir):
         rc, out = cmd_fixture("--repo=%s" % repo, "extract", "archive")
         assert rc == EXIT_SUCCESS
     rc, out = cmd_fixture("--repo=%s" % repo, "extract", "archive", "does/not/match")
-    assert rc == EXIT_WARNING  # pattern did not match
+    assert rc == IncludePatternNeverMatchedWarning().exit_code
     rc, out = cmd_fixture("--repo=%s" % repo, "create", "archive", str(input))
-    assert rc == EXIT_ERROR  # duplicate archive name
+    assert rc == Archive.AlreadyExists().exit_code