[OE-core][PATCH] classes/crate-fetch: Ensure crate fetcher is available

[Joshua Watt <jpewhacker@gmail.com>]

Reworks the crate fetcher class to have it install the fetcher at recipe
finalization so that it is always available before SRC_URI is expanded.
In addition, override the value of SRCPV to also install the fetcher
when SRCPV is expanded so that AUTOREV works.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
---
 meta/classes/crate-fetch.bbclass | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/meta/classes/crate-fetch.bbclass b/meta/classes/crate-fetch.bbclass
index c0ed434a96..a7fa22b2a0 100644
--- a/meta/classes/crate-fetch.bbclass
+++ b/meta/classes/crate-fetch.bbclass
@@ -7,7 +7,22 @@
 # crate://<packagename>/<version>
 #
 
-python () {
-        import crate
-        bb.fetch2.methods.append( crate.Crate() )
+def import_crate(d):
+    import crate
+    if not getattr(crate, 'imported', False):
+        bb.fetch2.methods.append(crate.Crate())
+        crate.imported = True
+
+python crate_import_handler() {
+    import_crate(d)
 }
+
+addhandler crate_import_handler
+crate_import_handler[eventmask] = "bb.event.RecipePreFinalise"
+
+def crate_get_srcrev(d):
+    import_crate(d)
+    return bb.fetch2.get_srcrev(d)
+
+# Override SRCPV to make sure it imports the fetcher first
+SRCPV = "${@crate_get_srcrev(d)}"
-- 
2.33.0