[PATCH 1/3] config: deprecate/drop crypto.gpg_path under gmime 2.6/3.0

[Daniel Kahn Gillmor <dkg@fifthhorseman.net>]

gmime 3.0 no longer offers a means to set the path for gpg.

Users can set $PATH anyway if they want to pick a
differently-installed gpg (e.g. /usr/local/bin/gpg), so this isn't
much of a reduction in functionality.

The one main difference is for people who have tried to use "gpg2" to
make use of gpg 2.1, but that isn't usefully co-installable anyway.
---
 doc/man1/notmuch-config.rst |  4 +++-
 notmuch-client.h            |  4 ++++
 notmuch-config.c            | 20 +++++++++++++++++---
 notmuch-reply.c             |  2 ++
 notmuch-show.c              |  2 ++
 test/T030-config.sh         |  9 +++++++--
 test/T040-setup.sh          |  8 +++++++-
 7 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/doc/man1/notmuch-config.rst b/doc/man1/notmuch-config.rst
index 7483b75f..6a51e64f 100644
--- a/doc/man1/notmuch-config.rst
+++ b/doc/man1/notmuch-config.rst
@@ -128,7 +128,9 @@ The available configuration items are described below.
     **crypto.gpg_path**
 
         Name (or full path) of gpg binary to use in verification and
-        decryption of PGP/MIME messages.
+        decryption of PGP/MIME messages.  NOTE: This configuration
+        item is deprecated, and will be ignored if notmuch is built
+        against GMime 3.0 or later.
 
         Default: ``gpg``.
 
diff --git a/notmuch-client.h b/notmuch-client.h
index 77b34184..11aefbb4 100644
--- a/notmuch-client.h
+++ b/notmuch-client.h
@@ -76,7 +76,9 @@ typedef struct notmuch_crypto {
     notmuch_crypto_context_t* pkcs7ctx;
     notmuch_bool_t verify;
     notmuch_bool_t decrypt;
+#if (GMIME_MAJOR_VERSION < 3)
     const char *gpgpath;
+#endif
 } notmuch_crypto_t;
 
 typedef struct notmuch_show_params {
@@ -289,12 +291,14 @@ void
 notmuch_config_set_database_path (notmuch_config_t *config,
 				  const char *database_path);
 
+#if (GMIME_MAJOR_VERSION < 3)
 const char *
 notmuch_config_get_crypto_gpg_path (notmuch_config_t *config);
 
 void
 notmuch_config_set_crypto_gpg_path (notmuch_config_t *config,
 				  const char *gpg_path);
+#endif
 
 const char *
 notmuch_config_get_user_name (notmuch_config_t *config);
diff --git a/notmuch-config.c b/notmuch-config.c
index e4aaef61..cb9529b9 100644
--- a/notmuch-config.c
+++ b/notmuch-config.c
@@ -104,10 +104,20 @@ static const char search_config_comment[] =
 static const char crypto_config_comment[] =
     " Cryptography related configuration\n"
     "\n"
-    " The following option is supported here:\n"
+#if (GMIME_MAJOR_VERSION < 3)
+    " The following *deprecated* option is currently supported:\n"
     "\n"
     "\tgpg_path\n"
-    "\t\tbinary name or full path to invoke gpg.\n";
+    "\t\tbinary name or full path to invoke gpg.\n"
+    "\t\tNOTE: In a future build, this option will be ignored.\n"
+#else
+    " The following old option is now ignored:\n"
+    "\n"
+    "\tgpgpath\n"
+    "\t\tThis option was used by older builds of notmuch to choose\n"
+    "\t\tthe version of gpg to use.\n"
+#endif
+    "\t\tSetting $PATH is a better approach.\n";
 
 struct _notmuch_config {
     char *filename;
@@ -460,10 +470,12 @@ notmuch_config_open (void *ctx,
 	g_error_free (error);
     }
 
+#if (GMIME_MAJOR_VERSION < 3)
     if (notmuch_config_get_crypto_gpg_path (config) == NULL) {
 	notmuch_config_set_crypto_gpg_path (config, "gpg");
     }
-    
+#endif
+
     /* Whenever we know of configuration sections that don't appear in
      * the configuration file, we add some comments to help the user
      * understand what can be done. */
@@ -752,6 +764,7 @@ notmuch_config_set_search_exclude_tags (notmuch_config_t *config,
 		      &(config->search_exclude_tags));
 }
 
+#if (GMIME_MAJOR_VERSION < 3)
 const char *
 notmuch_config_get_crypto_gpg_path (notmuch_config_t *config)
 {
@@ -764,6 +777,7 @@ notmuch_config_set_crypto_gpg_path (notmuch_config_t *config,
 {
     _config_set (config, &config->crypto_gpg_path, "crypto", "gpg_path", gpg_path);
 }
+#endif
 
 
 /* Given a configuration item of the form <group>.<key> return the
diff --git a/notmuch-reply.c b/notmuch-reply.c
index 4c1dd560..b4a55362 100644
--- a/notmuch-reply.c
+++ b/notmuch-reply.c
@@ -740,7 +740,9 @@ notmuch_reply_command (notmuch_config_t *config, int argc, char *argv[])
 	return EXIT_FAILURE;
     }
 
+#if (GMIME_MAJOR_VERSION < 3)
     params.crypto.gpgpath = notmuch_config_get_crypto_gpg_path (config);
+#endif
 
     if (notmuch_database_open (notmuch_config_get_database_path (config),
 			       NOTMUCH_DATABASE_MODE_READ_ONLY, &notmuch))
diff --git a/notmuch-show.c b/notmuch-show.c
index 71799c75..6c135278 100644
--- a/notmuch-show.c
+++ b/notmuch-show.c
@@ -1199,7 +1199,9 @@ notmuch_show_command (notmuch_config_t *config, int argc, char *argv[])
 	return EXIT_FAILURE;
     }
 
+#if (GMIME_MAJOR_VERSION < 3)
     params.crypto.gpgpath = notmuch_config_get_crypto_gpg_path (config);
+#endif
 
     if (notmuch_database_open (notmuch_config_get_database_path (config),
 			       NOTMUCH_DATABASE_MODE_READ_ONLY, &notmuch))
diff --git a/test/T030-config.sh b/test/T030-config.sh
index 0915abdb..2cee6ed0 100755
--- a/test/T030-config.sh
+++ b/test/T030-config.sh
@@ -44,6 +44,12 @@ test_expect_equal "$(notmuch config get foo.nonexistent)" ""
 
 test_begin_subtest "List all items"
 notmuch config list 2>&1 | notmuch_config_sanitize > OUTPUT
+
+if [ "${NOTMUCH_GMIME_MAJOR}" -lt 3 ]; then
+    config_gpg_path="crypto.gpg_path=gpg
+"
+fi
+
 cat <<EOF > EXPECTED
 Error opening database at MAIL_DIR/.notmuch: No such file or directory
 database.path=MAIL_DIR
@@ -54,8 +60,7 @@ new.tags=unread;inbox;
 new.ignore=
 search.exclude_tags=
 maildir.synchronize_flags=true
-crypto.gpg_path=gpg
-foo.string=this is another string value
+${config_gpg_path}foo.string=this is another string value
 foo.list=this;is another;list value;
 built_with.compact=something
 built_with.field_processor=something
diff --git a/test/T040-setup.sh b/test/T040-setup.sh
index 021f2d0b..8e0e3b13 100755
--- a/test/T040-setup.sh
+++ b/test/T040-setup.sh
@@ -19,6 +19,12 @@ another.suite@example.com
 foo bar
 baz
 EOF
+
+if [ "${NOTMUCH_GMIME_MAJOR}" -lt 3 ]; then
+    config_gpg_path="crypto.gpg_path=gpg
+"
+fi
+
 output=$(notmuch --config=new-notmuch-config config list | notmuch_built_with_sanitize)
 test_expect_equal "$output" "\
 database.path=/path/to/maildir
@@ -29,7 +35,7 @@ new.tags=foo;bar;
 new.ignore=
 search.exclude_tags=baz;
 maildir.synchronize_flags=true
-crypto.gpg_path=gpg
+"${config_gpg_path}"\
 built_with.compact=something
 built_with.field_processor=something
 built_with.retry_lock=something"
-- 
2.13.2