REBASEME: Try to fix Hydra build

Author: sgillespie

flake.nix

@@ -46,6 +46,63 @@
           # target the same way nixpkgs does for isStatic platforms.
           static-liburing = final.liburing.overrideAttrs (old: {
             dontdisableStatic = true;
+            # Workaround for macOS builders: recreate man page symlinks that may be lost
+            # during cross-compilation from Darwin to Linux
+            preInstall = (old.preInstall or "") + ''
+              echo "=== LIBURING PREINSTALL DEBUG ==="
+              echo "PWD: $(pwd)"
+              echo "Checking man directory contents BEFORE fix:"
+              ls -la man/ | grep -E "(IO_URING|io_uring).*VERSION" || echo "No VERSION-related files found"
+
+              echo "Checking if symlink TARGET exists:"
+              ls -la man/io_uring_check_version.3 || echo "  ✗ TARGET FILE io_uring_check_version.3 DOES NOT EXIST!"
+
+              echo "Listing ALL man/*check_version* files:"
+              ls -la man/*check_version* 2>&1 || echo "None found"
+
+              echo "Searching for check_version in all of man/:"
+              find man/ -name "*check_version*" -ls || echo "None found"
+
+              # Fix case-hack filenames that Nix creates on case-insensitive filesystems (macOS)
+              echo "Renaming case-hacked files back to original names..."
+              for f in man/*~nix~case~hack~*; do
+                if [ -f "$f" ]; then
+                  original="''${f%~nix~case~hack~*}"
+                  echo "  Renaming $f -> $original"
+                  mv "$f" "$original"
+                fi
+              done
+
+              # Always recreate uppercase symlinks to ensure they exist for install phase
+              # (lowercase versions are real files, not symlinks)
+              echo "Creating/recreating man page symlinks..."
+              ln -sf io_uring_check_version.3 man/IO_URING_CHECK_VERSION.3
+              ln -sf io_uring_check_version.3 man/IO_URING_VERSION_MAJOR.3
+              ln -sf io_uring_check_version.3 man/IO_URING_VERSION_MINOR.3
+
+              echo "Checking man directory contents AFTER fix:"
+              ls -la man/ | grep -E "(IO_URING|io_uring).*VERSION"
+
+              echo "Testing glob expansion of man/*.3:"
+              ls man/*.3 | wc -l
+              echo "Testing stat of specific failing files:"
+              stat man/IO_URING_CHECK_VERSION.3 && echo "  ✓ IO_URING_CHECK_VERSION.3 exists" || echo "  ✗ IO_URING_CHECK_VERSION.3 missing"
+              stat man/IO_URING_VERSION_MAJOR.3 && echo "  ✓ IO_URING_VERSION_MAJOR.3 exists" || echo "  ✗ IO_URING_VERSION_MAJOR.3 missing"
+              stat man/io_uring_major_version.3 && echo "  ✓ io_uring_major_version.3 exists" || echo "  ✗ io_uring_major_version.3 missing"
+
+              echo "Testing actual install command to /tmp:"
+              mkdir -p /tmp/liburing-install-test
+              if install -m 644 man/*.3 /tmp/liburing-install-test/; then
+                echo "  ✓ Install command succeeded! Installed $(ls /tmp/liburing-install-test/*.3 | wc -l) files"
+                rm -rf /tmp/liburing-install-test
+              else
+                echo "  ✗ Install command FAILED with exit code $?"
+                rm -rf /tmp/liburing-install-test
+                exit 1
+              fi
+              echo "=== END LIBURING PREINSTALL DEBUG ==="
+            '';
+
             postInstall = ''
               # Always builds both static and dynamic libraries, so we need to remove the
               # dynamic libraries.