Merge shared/exec-directory-util.? into basic/unit-def.?

Suggested in
https://github.com/systemd/systemd/pull/35892#discussion_r2180322856.

This is a tiny amount of code and does not warrant having a separate file
and spawning a separate instance of the compiler during the build.

Note: it took me a while to confirm that the contents of that table and
function don't end up in libsystemd.so. The issue is that they _are_ present in
it, unless LTO is used. We actually use link_whole[libbasic_static] for
libsystemd, so we end up with all that code there. LTO is needed to clean
that up.

src/basic/unit-def.c

@@ -361,6 +361,17 @@ static const char* const job_mode_table[_JOB_MODE_MAX] = {
 
 DEFINE_STRING_TABLE_LOOKUP(job_mode, JobMode);
 
+/* This table maps ExecDirectoryType to the setting it is configured with in the unit */
+static const char* const exec_directory_type_table[_EXEC_DIRECTORY_TYPE_MAX] = {
+        [EXEC_DIRECTORY_RUNTIME]       = "RuntimeDirectory",
+        [EXEC_DIRECTORY_STATE]         = "StateDirectory",
+        [EXEC_DIRECTORY_CACHE]         = "CacheDirectory",
+        [EXEC_DIRECTORY_LOGS]          = "LogsDirectory",
+        [EXEC_DIRECTORY_CONFIGURATION] = "ConfigurationDirectory",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(exec_directory_type, ExecDirectoryType);
+
 Glyph unit_active_state_to_glyph(UnitActiveState state) {
         static const Glyph map[_UNIT_ACTIVE_STATE_MAX] = {
                 [UNIT_ACTIVE]       = GLYPH_BLACK_CIRCLE,

src/basic/unit-def.h

@@ -296,6 +296,16 @@ typedef enum JobMode {
         _JOB_MODE_INVALID = -EINVAL,
 } JobMode;
 
+typedef enum ExecDirectoryType {
+        EXEC_DIRECTORY_RUNTIME,
+        EXEC_DIRECTORY_STATE,
+        EXEC_DIRECTORY_CACHE,
+        EXEC_DIRECTORY_LOGS,
+        EXEC_DIRECTORY_CONFIGURATION,
+        _EXEC_DIRECTORY_TYPE_MAX,
+        _EXEC_DIRECTORY_TYPE_INVALID = -EINVAL,
+} ExecDirectoryType;
+
 char* unit_dbus_path_from_name(const char *name);
 int unit_name_from_dbus_path(const char *path, char **name);
 
@@ -361,4 +371,7 @@ NotifyAccess notify_access_from_string(const char *s) _pure_;
 const char* job_mode_to_string(JobMode t) _const_;
 JobMode job_mode_from_string(const char *s) _pure_;
 
+const char* exec_directory_type_to_string(ExecDirectoryType i) _const_;
+ExecDirectoryType exec_directory_type_from_string(const char *s) _pure_;
+
 Glyph unit_active_state_to_glyph(UnitActiveState state);

src/core/execute.h

@@ -7,7 +7,6 @@
 #include "cgroup-util.h"
 #include "core-forward.h"
 #include "cpu-set-util.h"
-#include "exec-directory-util.h"
 #include "exec-util.h"
 #include "list.h"
 #include "log-context.h"

src/shared/exec-directory-util.c

@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-
-#include "exec-directory-util.h"
-#include "string-table.h"
-
-/* This table maps ExecDirectoryType to the setting it is configured with in the unit */
-static const char* const exec_directory_type_table[_EXEC_DIRECTORY_TYPE_MAX] = {
-        [EXEC_DIRECTORY_RUNTIME]       = "RuntimeDirectory",
-        [EXEC_DIRECTORY_STATE]         = "StateDirectory",
-        [EXEC_DIRECTORY_CACHE]         = "CacheDirectory",
-        [EXEC_DIRECTORY_LOGS]          = "LogsDirectory",
-        [EXEC_DIRECTORY_CONFIGURATION] = "ConfigurationDirectory",
-};
-
-DEFINE_STRING_TABLE_LOOKUP(exec_directory_type, ExecDirectoryType);

src/shared/exec-directory-util.h

@@ -1,19 +0,0 @@
-/* SPDX-License-Identifier: LGPL-2.1-or-later */
-#pragma once
-
-#include <errno.h>
-
-#include "macro-fundamental.h"
-
-typedef enum ExecDirectoryType {
-        EXEC_DIRECTORY_RUNTIME,
-        EXEC_DIRECTORY_STATE,
-        EXEC_DIRECTORY_CACHE,
-        EXEC_DIRECTORY_LOGS,
-        EXEC_DIRECTORY_CONFIGURATION,
-        _EXEC_DIRECTORY_TYPE_MAX,
-        _EXEC_DIRECTORY_TYPE_INVALID = -EINVAL,
-} ExecDirectoryType;
-
-const char* exec_directory_type_to_string(ExecDirectoryType i) _const_;
-ExecDirectoryType exec_directory_type_from_string(const char *s) _pure_;

src/shared/meson.build

@@ -69,7 +69,6 @@ shared_sources = files(
         'elf-util.c',
         'enable-mempool.c',
         'ethtool-util.c',
-        'exec-directory-util.c',
         'exec-util.c',
         'exit-status.c',
         'extension-util.c',

src/systemctl/systemctl-show.c

@@ -15,7 +15,6 @@
 #include "cgroup-show.h"
 #include "cpu-set-util.h"
 #include "errno-util.h"
-#include "exec-directory-util.h"
 #include "exec-util.h"
 #include "exit-status.h"
 #include "extract-word.h"