grub2/0034-Ignore-EPERM-when-modifying-kern.geom.debugflags.patch

From aa4a525fe853594ed566b2bafa7b8bc101c78a88 Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@ubuntu.com>
Date: Fri, 17 Jan 2014 02:28:46 +0000
Subject: [PATCH 034/103] Ignore EPERM when modifying kern.geom.debugflags

Many tests fail when run as a non-root user on FreeBSD.  The failures
all amount to an inability to open files using grub_util_fd_open,
because we cannot set the kern.geom.debugflags sysctl.  This sysctl is
indeed important to allow us to do such things as installing GRUB to the
MBR, but if we need to do that and can't then we will get an error
later.  Enforcing it here is unnecessary and prevents otherwise
perfectly reasonable operations.
---
 ChangeLog                          |  7 +++++++
 grub-core/osdep/freebsd/hostdisk.c | 12 ++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 9073b1e..a7aee43 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2014-01-19  Colin Watson  <cjwatson@ubuntu.com>
+
+	* grub-core/osdep/freebsd/hostdisk.c (grub_util_fd_open): Ignore
+	EPERM when modifying kern.geom.debugflags.  It is only a problem for
+	such things as installing GRUB to the MBR, in which case there'll be
+	an error later anyway, not for opening files during tests.
+
 2014-01-18  Andrey Borzenkov <arvidjaar@gmail.com>
 
 	* grub-core/Makefile.am: Build grub_emu_init.[ch] from MODULE_FILES
diff --git a/grub-core/osdep/freebsd/hostdisk.c b/grub-core/osdep/freebsd/hostdisk.c
index eb202dc..6145d07 100644
--- a/grub-core/osdep/freebsd/hostdisk.c
+++ b/grub-core/osdep/freebsd/hostdisk.c
@@ -102,8 +102,16 @@ grub_util_fd_open (const char *os_dev, int flags)
   if (! (sysctl_oldflags & 0x10)
       && sysctlbyname ("kern.geom.debugflags", NULL , 0, &sysctl_flags, sysctl_size))
     {
-      grub_error (GRUB_ERR_BAD_DEVICE, "cannot set flags of sysctl kern.geom.debugflags");
-      return GRUB_UTIL_FD_INVALID;
+      if (errno == EPERM)
+	/* Running as an unprivileged user; don't worry about restoring
+	   flags, although if we try to write to anything interesting such
+	   as the MBR then we may fail later.  */
+	sysctl_oldflags = 0x10;
+      else
+	{
+	  grub_error (GRUB_ERR_BAD_DEVICE, "cannot set flags of sysctl kern.geom.debugflags");
+	  return GRUB_UTIL_FD_INVALID;
+	}
     }
 
   ret = open (os_dev, flags, S_IROTH | S_IRGRP | S_IRUSR | S_IWUSR);
-- 
1.9.0