From 68d1d9a7fc08c281174f57b638fa06f7aea73601 Mon Sep 17 00:00:00 2001
From: Dusty Mabe <dusty@dustymabe.com>
Date: Thu, 1 Jun 2023 09:23:41 -0400
Subject: [PATCH] lib/deploy: skip fallocate call when requested size is 0
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If the requested size is 0 then of course we have enough room 🙂

This avoids the fallocate call returning an EINVAL.

Closes: #2869
---
 src/libostree/ostree-sysroot-deploy.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libostree/ostree-sysroot-deploy.c b/src/libostree/ostree-sysroot-deploy.c
index c5ced04c..d6304734 100644
--- a/src/libostree/ostree-sysroot-deploy.c
+++ b/src/libostree/ostree-sysroot-deploy.c
@@ -2446,6 +2446,14 @@ get_kernel_layout_size (OstreeSysroot *self, OstreeDeployment *deployment, guint
 static gboolean
 dfd_fallocate_check (int dfd, __off_t len, gboolean *out_passed, GError **error)
 {
+  /* If the requested size is 0 then return early. Passing a 0 len to
+   * fallocate results in EINVAL */
+  if (len == 0)
+    {
+      *out_passed = TRUE;
+      return TRUE;
+    }
+
   g_auto (GLnxTmpfile) tmpf = {
     0,
   };
-- 
2.30.2