[PATCH 2/3] tools/hotplug: Fix dhcpd symlink removal in vif-nat

[Diego Sueiro <diego.sueiro@xxxxxxx>]

Copy temp files used to add/remove dhcpd configurations to avoid
replacing potential symlinks.

Signed-off-by: Diego Sueiro <diego.sueiro@xxxxxxx>
---
 tools/hotplug/Linux/vif-nat | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/hotplug/Linux/vif-nat b/tools/hotplug/Linux/vif-nat
index 2614435..1ab80ed 100644
--- a/tools/hotplug/Linux/vif-nat
+++ b/tools/hotplug/Linux/vif-nat
@@ -99,7 +99,8 @@ dhcparg_remove_entry()
   then
     rm "$tmpfile"
   else
-    mv "$tmpfile" "$dhcpd_arg_file"
+    cp "$tmpfile" "$dhcpd_arg_file"
+    rm "$tmpfile"
   fi
 }
 
@@ -109,11 +110,11 @@ dhcparg_add_entry()
   local tmpfile=$(mktemp)
   # handle Red Hat, SUSE, and Debian styles, with or without quotes
   sed -e 's/^DHCPDARGS="*\([^"]*\)"*/DHCPDARGS="\1'"${dev} "'"/' \
-     "$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
+     "$dhcpd_arg_file" >"$tmpfile" && cp "$tmpfile" "$dhcpd_arg_file"
   sed -e 's/^DHCPD_INTERFACE="*\([^"]*\)"*/DHCPD_INTERFACE="\1'"${dev} "'"/' \
-     "$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
+     "$dhcpd_arg_file" >"$tmpfile" && cp "$tmpfile" "$dhcpd_arg_file"
   sed -e 's/^INTERFACES="*\([^"]*\)"*/INTERFACES="\1'"${dev} "'"/' \
-     "$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
+     "$dhcpd_arg_file" >"$tmpfile" && cp "$tmpfile" "$dhcpd_arg_file"
   rm -f "$tmpfile"
 }
 
@@ -125,7 +126,8 @@ dhcp_remove_entry()
   then
     rm "$tmpfile"
   else
-    mv "$tmpfile" "$dhcpd_conf_file"
+    cp "$tmpfile" "$dhcpd_conf_file"
+    rm "$tmpfile"
   fi
   dhcparg_remove_entry
 }
-- 
2.7.4