doc/bugs/No_viable_build_plan_for_ghc_9.2.2.mdwn

@@ -0,0 +1,84 @@
+### Please describe the problem.
+
+Some dependencies of `git-annex` don't have viable releases for ghc-9.2.2 (aws, bloomfilter).
+
+```
+cabal v2-build
+Resolving dependencies...
+cabal: Could not resolve dependencies:
+[__0] trying: bloomfilter-2.0.1.0 (user goal)
+[__1] trying: deepseq-1.4.6.1/installed-1.4.6.1 (dependency of bloomfilter)
+[__2] trying: bytestring-0.11.3.0/installed-0.11.3.0 (dependency of
+bloomfilter)
+[__3] trying: base-4.16.1.0/installed-4.16.1.0 (dependency of bloomfilter)
+[__4] trying: git-annex-10.20220322 (user goal)
+[__5] trying: uuid-1.3.15 (dependency of git-annex)
+[__6] trying: time-1.11.1.1/installed-1.11.1.1 (dependency of git-annex)
+[__7] trying: aws-0.22 (dependency of git-annex)
+[__8] next goal: aeson (dependency of git-annex)
+[__8] rejecting: aeson-2.0.3.0 (conflict: aws => aeson>=0.6 && <1.6)
+[__8] skipping: aeson-2.0.2.0, aeson-2.0.1.0, aeson-2.0.0.0 (has the same
+characteristics that caused the previous version to fail: excluded by
+constraint '>=0.6 && <1.6' from 'aws')
+...
+```
+
+### What steps will reproduce the problem?
+
+`cabal v2-build [--allow-newer]`
+
+### What version of git-annex are you using? On what operating system?
+
+I checked out HEAD as of `b25bfecb1`. Building it on OpenBSD with ghc-9.2.2.
+
+
+### Please provide any additional information below.
+
+Building with `--allow-newer` first points at `bloomfilter` which is a [known problem with a patch](https://github.com/bos/bloomfilter/pull/20). The next problem is with `aws` and this appears to [also be a known issue](https://github.com/aristidb/aws/issues/275) which also [has a patch](https://github.com/aristidb/aws/pull/277).
+
+### Have you had any luck using git-annex before? 
+
+Yes, very much so. It works great as an OpenBSD port when built with ghc-8.10.6.
+
+### Minor fix is required to git-annex
+
+Once I apply this little fix to `git-annex` and the two patches referenced above, the code type-checks.
+
+```patch
+diff --git a/Types/Export.hs b/Types/Export.hs
+index a5cb173e5..2d5419b91 100644
+--- a/Types/Export.hs
++++ b/Types/Export.hs
+@@ -21,7 +21,7 @@ import Git.FilePath
+ import Utility.Split
+ import Utility.FileSystemEncoding
+ 
+-import Data.ByteString.Short as S
++import qualified Data.ByteString.Short as S
+ import qualified System.FilePath.Posix as Posix
+ import GHC.Generics
+ import Control.DeepSeq
+```
+
+I also see all but one tests pass, but I'm pretty sure the same test used to fail with the older compiler:
+
+```
+Tests
+  Tasty
+    tasty self-check:                      OK
+      +++ OK, passed 1 test.
+  Repo Tests v8 locked
+    Init Tests
+      init:                                OK (0.77s)
+      add:                                 OK (2.71s)
+    rsync remote:                          FAIL (3.58s)
+      ./Test/Framework.hs:328:
+      able to modify annexed file's foo content
+      Use -p '/rsync remote/' to rerun this test only.
+    conflict resolution (adjusted branch): OK (16.26s)
+    conversion annexed to git:             OK (3.32s)
+    move (ssh remote):                     OK (6.11s)
+    export_import:                         OK (13.23s)
+
+1 out of 8 tests failed (46.00s)
+```