userland/git: git-compatible CLI on v2's gix code (T10)

Local workflow, smart-HTTP clone/fetch/push and public HTTPS clone/fetch match
native git in stdout and exit codes. Only WASI imports (wasi:http, exit-with-code).

userland/git/public-https-test.nu

@@ -0,0 +1,16 @@
+#!/usr/bin/env nu
+# The host handles TLS. Test anonymous HTTPS against a small public repository.
+use std/assert
+def main [component: path] {
+ let component = ($component | path expand)
+ let fixture = (mktemp -d -p /tmp/p1-git public-https.XXXXXX)
+ with-env {GIT_AUTHOR_NAME: 'Agent', GIT_AUTHOR_EMAIL: 'agent@example.test', GIT_COMMITTER_NAME: 'Agent', GIT_COMMITTER_EMAIL: 'agent@example.test'} {
+  for args in [[clone https://github.com/octocat/Hello-World.git /hello] [-C /hello config user.name Agent] [-C /hello config user.email agent@example.test] [-C /hello fetch]] {
+   let result = (^wasmtime run -S http -S cli-exit-with-code=y --dir $'($fixture)::/' --env GIT_AUTHOR_NAME --env GIT_AUTHOR_EMAIL --env GIT_COMMITTER_NAME --env GIT_COMMITTER_EMAIL $component ...$args | complete)
+   if $result.exit_code != 0 {error make {msg: ($result | to json)}}
+   print $'HTTPS ($args | str join " "): PASS'
+  }
+  assert (($fixture | path join hello README) | path exists)
+  print $'Fixture: ($fixture)'
+ }
+}