From a217565d716afb3d7ca895c7af99a17b0005a1a9 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Mon, 27 Apr 2026 23:59:30 +0300
Subject: [PATCH] all: more test fixes

---
 .github/workflows/bootstrapping_ci.yml | 32 +++++++++++++++++++++-----
 cmd/tools/vdownload.v                  |  8 +++++++
 vlib/v/gen/c/cgen.v                    |  4 ++++
 3 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/bootstrapping_ci.yml b/.github/workflows/bootstrapping_ci.yml
index f76cc97f2..701f7ec94 100644
--- a/.github/workflows/bootstrapping_ci.yml
+++ b/.github/workflows/bootstrapping_ci.yml
@@ -80,18 +80,34 @@ jobs:
           # The workflow used below is `Path Testing CI` (18477644).
           # Fetch several successful runs and pick the first commit that is actually reachable on master.
           # Some runs may reference commits from force-pushed branches that are no longer on master.
+          fetch_page() {
+            local page="$1"
+            local body=""
+            for attempt in 1 2 3; do
+              body=$(curl -sL --max-time 30 \
+                -H "Accept: application/vnd.github+json" \
+                -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
+                -H "X-GitHub-Api-Version: 2022-11-28" \
+                "https://api.github.com/repos/vlang/v/actions/workflows/18477644/runs?branch=master&status=success&event=push&per_page=10&page=$page")
+              if [ -n "$body" ] && echo "$body" | jq -e '.workflow_runs' >/dev/null 2>&1; then
+                echo "$body" | jq -r '.workflow_runs[].head_sha'
+                return 0
+              fi
+              echo "::warning::page $page attempt $attempt failed, retrying..." >&2
+              sleep 5
+            done
+            return 1
+          }
           recent_good_commit=""
           valid_count=0
           for page in 1 2 3; do
-            commits=$(curl -sL \
-              -H "Accept: application/vnd.github+json" \
-              -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
-              -H "X-GitHub-Api-Version: 2022-11-28" \
-              "https://api.github.com/repos/vlang/v/actions/workflows/18477644/runs?branch=master&status=success&event=push&per_page=10&page=$page" \
-              | jq -r '.workflow_runs[].head_sha')
+            commits=$(fetch_page "$page" || true)
+            commit_count=$(printf '%s\n' "$commits" | grep -c . || true)
+            echo "page $page: fetched $commit_count commits"
             for sha in $commits; do
               if git merge-base --is-ancestor "$sha" master 2>/dev/null; then
                 valid_count=$((valid_count + 1))
+                echo "  valid #$valid_count: $sha"
                 # Skip the first few valid commits to get an older one for testing upgrades.
                 if [ "$valid_count" -ge 5 ]; then
                   recent_good_commit="$sha"
@@ -100,6 +116,10 @@ jobs:
               fi
             done
           done
+          if [ -z "$recent_good_commit" ]; then
+            echo "Path Testing CI lookup yielded only $valid_count valid commits; falling back to git log."
+            recent_good_commit=$(git log master --first-parent --format=%H --before='14 days ago' -n 1)
+          fi
           if [ -z "$recent_good_commit" ]; then
             echo "Could not find a valid recent good commit on master"
             exit 1
diff --git a/cmd/tools/vdownload.v b/cmd/tools/vdownload.v
index ab063eed6..d6d5e8fe6 100644
--- a/cmd/tools/vdownload.v
+++ b/cmd/tools/vdownload.v
@@ -94,6 +94,14 @@ fn main() {
 				time.sleep(ctx.delay)
 				continue
 			}
+			if fs := os.stat(fname) {
+				if fs.size == 0 {
+					log.error('    retry ${retry + 1}/${ctx.retries}, got an empty (0 byte) file from url: ${url}.')
+					file_errors++
+					time.sleep(ctx.delay)
+					continue
+				}
+			}
 			downloaded++
 			break
 		}
diff --git a/vlib/v/gen/c/cgen.v b/vlib/v/gen/c/cgen.v
index 31f50c425..6bfe27255 100644
--- a/vlib/v/gen/c/cgen.v
+++ b/vlib/v/gen/c/cgen.v
@@ -11905,6 +11905,10 @@ fn (mut g Gen) type_default_impl(typ_ ast.Type, decode_sumtype bool) string {
 				// Imported C aggregate types can be opaque in V, but still need a valid C zero initializer.
 				return '{0}'
 			}
+			if info.is_union {
+				// C unions can only have one initialized member; zero-init covers all of them.
+				return '{0}'
+			}
 			mut has_none_zero := info.fields.len == 0
 
 			mut init_str := if info.is_anon && !g.inside_global_decl {
-- 
2.39.5