From: Daan De Meyer <daan.j.demeyer@gmail.com>
Date: Fri, 23 Feb 2024 11:08:56 +0000 (+0100)
Subject: Limit ephemeral filename length
X-Git-Tag: v21~27
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=814f8280dd1047b96384cc1f437deaf397bb8aba;p=thirdparty%2Fmkosi.git

Limit ephemeral filename length
---

diff --git a/mkosi/qemu.py b/mkosi/qemu.py
index c03500322..6efcdff9d 100644
--- a/mkosi/qemu.py
+++ b/mkosi/qemu.py
@@ -438,8 +438,9 @@ def vsock_notify_handler() -> Iterator[tuple[str, dict[str, str]]]:
 def copy_ephemeral(config: Config, src: Path) -> Iterator[Path]:
     src = src.resolve()
     # tempfile doesn't provide an API to get a random filename in an arbitrary directory so we do this
-    # instead.
-    tmp = src.parent / f"{src.name}-{uuid.uuid4().hex}"
+    # instead. Limit the size to 16 characters as the output name might be used in a unix socket path by vmspawn and
+    # needs to fit in 108 characters.
+    tmp = src.parent / f"{src.name}-{uuid.uuid4().hex[:16]}"
 
     try:
         def copy() -> None: