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: Ia27d543a9c13b2c6973ab394ed88cd12d93e88a8
diff --git a/meson.build b/meson.build
index 201f0b9..c3ed12c 100644
--- a/meson.build
+++ b/meson.build
@@ -105,23 +105,12 @@
 
 configure_file(output: 'config.h', configuration: conf)
 
-sdbusplus_dep = dependency('sdbusplus', required: false)
-sdbusplus_proj = dependency('', required: false)
-if not sdbusplus_dep.found() or sdbusplus_dep.type_name() == 'internal'
-    sdbusplus_proj = subproject('sdbusplus')
-endif
-if not sdbusplus_dep.found()
-    sdbusplus_dep = sdbusplus_proj.get_variable('sdbusplus_dep')
-endif
+sdbusplus_dep = dependency('sdbusplus')
+sdbusplusplus_prog = find_program('sdbus++', native: true)
+sdbuspp_gen_meson_prog = find_program('sdbus++-gen-meson', native: true)
 
-if sdbusplus_proj.found()
-    sdbusplusplus_prog = sdbusplus_proj.get_variable('sdbusplusplus_prog')
-    sdbuspp_gen_meson_prog = sdbusplus_proj.get_variable(
-        'sdbuspp_gen_meson_prog')
-else
-    sdbusplusplus_prog = find_program('sdbus++', native: true)
-    sdbuspp_gen_meson_prog = find_program('sdbus++-gen-meson', native: true)
-endif
+pdi_dep = dependency('phosphor-dbus-interfaces')
+phosphor_logging_dep = dependency('phosphor-logging')
 
 cereal_dep = dependency('cereal', required: false)
 has_cereal = cpp.has_header_symbol(
@@ -141,16 +130,10 @@
 endif
 
 deps = [
-    dependency(
-        'phosphor-dbus-interfaces',
-        fallback: ['phosphor-dbus-interfaces', 'phosphor_dbus_interfaces_dep'],
-    ),
-    dependency(
-        'phosphor-logging',
-        fallback: ['phosphor-logging', 'phosphor_logging_dep'],
-    ),
-    sdbusplus_dep,
     cereal_dep,
+    pdi_dep,
+    phosphor_logging_dep,
+    sdbusplus_dep,
 ]
 
 ssl = dependency('openssl')
diff --git a/subprojects/CLI11.wrap b/subprojects/CLI11.wrap
index e695a9d..2e5a95b 100644
--- a/subprojects/CLI11.wrap
+++ b/subprojects/CLI11.wrap
@@ -1,3 +1,6 @@
 [wrap-git]
 url = https://github.com/CLIUtils/CLI11.git
 revision = HEAD
+
+[provide]
+CLI11 = CLI11_dep
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
diff --git a/subprojects/sdeventplus.wrap b/subprojects/sdeventplus.wrap
index 085bb5e..f871ac0 100644
--- a/subprojects/sdeventplus.wrap
+++ b/subprojects/sdeventplus.wrap
@@ -1,3 +1,6 @@
 [wrap-git]
 url = https://github.com/openbmc/sdeventplus.git
 revision = HEAD
+
+[provide]
+sdeventplus = sdeventplus_dep
diff --git a/usb/meson.build b/usb/meson.build
index bb1dc60..da7fc92 100644
--- a/usb/meson.build
+++ b/usb/meson.build
@@ -1,31 +1,17 @@
 if cpp.has_header('CLI/CLI.hpp')
     CLI11_dep = declare_dependency()
 else
-    CLI11_dep = dependency(
-        'CLI11',
-        fallback: [ 'CLI11', 'CLI11_dep' ],
-    )
+    CLI11_dep = dependency('CLI11')
 endif
 
+sdeventplus_dep = dependency('sdeventplus')
+
 source = [
     'usb_manager_main.cpp',
     'usb_manager.cpp',
     '../utils.cpp',
     ]
 
-sdeventplus_dep = dependency(
-    'sdeventplus',
-    fallback: [
-        'sdeventplus',
-        'sdeventplus_dep'
-    ],
-)
-
-phosphor_logging_dep = dependency(
-    'phosphor-logging',
-    fallback: ['phosphor-logging', 'phosphor_logging_dep'],
-)
-
 executable(
     'phosphor-usb-code-update',
     source,