Fix test failure of test_XXX caused by upgrade of gpgme from 1.6.0 to
1.8.0:

======================================================================
FAIL: test_encrypt_to_signonly (tests.test_encrypt_decrypt.EncryptDecryptTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python2-pygpgme-0.3.drv-0/pygpgme-0.3/tests/test_encrypt_decrypt.py", line 185, in test_encrypt_to_signonly
    self.assertEqual(exc.args[0], gpgme.ERR_SOURCE_UNKNOWN)
AssertionError: 7 != 0

----------------------------------------------------------------------

Patch copied from the Debian package pygpgme-0.3-1.2:

https://sources.debian.net/src/pygpgme/0.3-1.2/debian/patches/0005-Fix-test-failures-with-pinentry.patch/

From: "Dr. Tobias Quathamer" <toddy@debian.org>
Date: Thu, 24 Nov 2016 12:20:54 +0100
Subject: Fix test failures with pinentry

---
 tests/test_encrypt_decrypt.py | 5 +++--
 tests/test_passphrase.py      | 2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tests/test_encrypt_decrypt.py b/tests/test_encrypt_decrypt.py
index 21ae83e..05707e1 100644
--- a/tests/test_encrypt_decrypt.py
+++ b/tests/test_encrypt_decrypt.py
@@ -132,6 +132,7 @@ class EncryptDecryptTestCase(GpgHomeTestCase):
             os.write(fd, b'Symmetric passphrase\n')
         ctx = gpgme.Context()
         ctx.armor = True
+        ctx.pinentry_mode = gpgme.PINENTRY_MODE_LOOPBACK
         ctx.passphrase_cb = passphrase
         ctx.encrypt(None, 0, plaintext, ciphertext)
         self.assertTrue(
@@ -182,8 +183,8 @@ class EncryptDecryptTestCase(GpgHomeTestCase):
             ctx.encrypt([recipient], gpgme.ENCRYPT_ALWAYS_TRUST,
                         plaintext, ciphertext)
         except gpgme.GpgmeError as exc:
-            self.assertEqual(exc.args[0], gpgme.ERR_SOURCE_UNKNOWN)
-            self.assertEqual(exc.args[1], gpgme.ERR_GENERAL)
+            self.assertEqual(exc.args[0], gpgme.ERR_SOURCE_GPGME)
+            self.assertEqual(exc.args[1], gpgme.ERR_UNUSABLE_PUBKEY)
         else:
             self.fail('gpgme.GpgmeError not raised')
 
diff --git a/tests/test_passphrase.py b/tests/test_passphrase.py
index 35b3c59..05e6811 100644
--- a/tests/test_passphrase.py
+++ b/tests/test_passphrase.py
@@ -34,6 +34,7 @@ class PassphraseTestCase(GpgHomeTestCase):
         ctx = gpgme.Context()
         key = ctx.get_key('EFB052B4230BBBC51914BCBB54DCBBC8DBFB9EB3')
         ctx.signers = [key]
+        ctx.pinentry_mode = gpgme.PINENTRY_MODE_LOOPBACK
         plaintext = BytesIO(b'Hello World\n')
         signature = BytesIO()
 
@@ -55,6 +56,7 @@ class PassphraseTestCase(GpgHomeTestCase):
         ctx = gpgme.Context()
         key = ctx.get_key('EFB052B4230BBBC51914BCBB54DCBBC8DBFB9EB3')
         ctx.signers = [key]
+        ctx.pinentry_mode = gpgme.PINENTRY_MODE_LOOPBACK
         ctx.passphrase_cb = self.passphrase_cb
         plaintext = BytesIO(b'Hello World\n')
         signature = BytesIO()
erarchy side-steps the
risks associated with providing a list of file names:

1. Duplicated files in the archive (recorded as hard links by GNU Tar)
2. Missing parent directories.

The above would cause dpkg to malfunction, for example by aborting early and
skipping triggers when there were missing parent directories.

* guix/scripts/pack.scm (self-contained-tarball/builder): Do not call
POPULATE-SINGLE-PROFILE-DIRECTORY, which creates extraneous files such as
/root.  Instead, call POPULATE-STORE and INSTALL-DATABASE-AND-GC-ROOTS
individually to more precisely generate the file system.  Replace the list of
files by the current directory, "." and streamline the way options are passed.
* gnu/system/file-systems.scm (reduce-directories): Remove procedure.
* tests/file-systems.scm ("reduce-directories"): Remove test.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-06-29 14:53:21 -0400'>2021-06-29</span></td><td><a href='/guix/commit/tests/file-systems.scm?id=4f3bdc8f21657dbda857027b3ec8754dd4c7c67b'>pack: Prevent duplicate files in tar archives.</a><span class='msg-avail'>...<span class='msg-tooltip'>Tar translate duplicate files in the archive into hard links.  These can cause
problems, as not every tool support them; for example dpkg doesn't.

* gnu/system/file-systems.scm (reduce-directories): New procedure.
(file-prefix?): Lift the restriction on file prefix.  The procedure can be
useful for comparing relative file names.  Adjust doc.
(file-name-depth): New procedure, extracted from ...
(btrfs-store-subvolume-file-name): ... here.
* guix/scripts/pack.scm (self-contained-tarball/builder): Use
reduce-directories.
* tests/file-systems.scm ("reduce-directories"): New test.
</span></span></td><td>Maxim Cournoyer</td></tr>