meson: simplify dependencies

Leverage wrapfile `[provide]` directives to simplify the dependency
searching in the meson.build.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Iba53eac924b7622f8c819c70c64279a2df0d28c4
diff --git a/meson.build b/meson.build
index 0e53730..0825c96 100644
--- a/meson.build
+++ b/meson.build
@@ -19,32 +19,12 @@
 
 libsystemd = dependency('libsystemd', version : '>=221')
 
-sdbusplus_dep = dependency('sdbusplus', required: false)
-if sdbusplus_dep.found()
-    sdbusplusplus_prog = find_program('sdbus++')
-    sdbuspp_gen_meson_prog = find_program('sdbus++-gen-meson')
-else
-    sdbusplus_proj = subproject('sdbusplus', required: true)
-    sdbusplus_dep = sdbusplus_proj.get_variable('sdbusplus_dep')
-    sdbusplusplus_prog = sdbusplus_proj.get_variable('sdbusplusplus_prog')
-    sdbuspp_gen_meson_prog = sdbusplus_proj.get_variable(
-        'sdbuspp_gen_meson_prog'
-    )
-endif
-phosphor_dbus_interfaces_dep = dependency(
-    'phosphor-dbus-interfaces',
-    fallback: [
-        'phosphor-dbus-interfaces',
-        'phosphor_dbus_interfaces_dep'
-    ],
-)
-phosphor_logging_dep = dependency(
-    'phosphor-logging',
-    fallback: [
-        'phosphor-logging',
-        'phosphor_logging_dep'
-    ],
-)
+sdbusplus_dep = dependency('sdbusplus')
+sdbusplusplus_prog = find_program('sdbus++')
+sdbuspp_gen_meson_prog = find_program('sdbus++-gen-meson')
+
+phosphor_dbus_interfaces_dep = dependency('phosphor-dbus-interfaces')
+phosphor_logging_dep = dependency('phosphor-logging')
 
 fmt_dep = dependency('fmt', required: false)
 if not fmt_dep.found()
diff --git a/subprojects/phosphor-dbus-interfaces.wrap b/subprojects/phosphor-dbus-interfaces.wrap
index 935a8b2..346aa0c 100644
--- a/subprojects/phosphor-dbus-interfaces.wrap
+++ b/subprojects/phosphor-dbus-interfaces.wrap
@@ -1,3 +1,6 @@
 [wrap-git]
 url = https://github.com/openbmc/phosphor-dbus-interfaces.git
 revision = HEAD
+
+[provide]
+phosphor-dbus-interfaces = phosphor_dbus_interfaces_dep
diff --git a/subprojects/phosphor-logging.wrap b/subprojects/phosphor-logging.wrap
index a039fcf..71eee8b 100644
--- a/subprojects/phosphor-logging.wrap
+++ b/subprojects/phosphor-logging.wrap
@@ -1,3 +1,6 @@
 [wrap-git]
 url = https://github.com/openbmc/phosphor-logging.git
 revision = HEAD
+
+[provide]
+phosphor-logging = phosphor_logging_dep
diff --git a/subprojects/sdbusplus.wrap b/subprojects/sdbusplus.wrap
index d470130..edd9a31 100644
--- a/subprojects/sdbusplus.wrap
+++ b/subprojects/sdbusplus.wrap
@@ -1,3 +1,7 @@
 [wrap-git]
 url = https://github.com/openbmc/sdbusplus.git
 revision = HEAD
+
+[provide]
+sdbusplus = sdbusplus_dep
+program_names = sdbus++, sdbus++-gen-meson