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-rw-r--r--guestfish-actions.pod9
1 files changed, 7 insertions, 2 deletions
diff --git a/guestfish-actions.pod b/guestfish-actions.pod
index 8ced2e14..e727120f 100644
--- a/guestfish-actions.pod
+++ b/guestfish-actions.pod
@@ -26,7 +26,8 @@ for whatever operations you want to perform (ie. read access if you
just want to read the image or write access if you want to modify the
image).
-This is equivalent to the qemu parameter C<-drive file=filename,cache=off>.
+This is equivalent to the qemu parameter
+C<-drive file=filename,cache=off,if=virtio>.
Note that this call checks for the existence of C<filename>. This
stops you from specifying other types of drive which are supported
@@ -47,7 +48,7 @@ handle is closed. We don't currently have any method to enable
changes to be committed, although qemu can support this.
This is equivalent to the qemu parameter
-C<-drive file=filename,snapshot=on>.
+C<-drive file=filename,snapshot=on,if=virtio>.
Note that this call checks for the existence of C<filename>. This
stops you from specifying other types of drive which are supported
@@ -1665,6 +1666,10 @@ with permissions like "-rw-r--r--" or "-rwxr-xr-x", and
C<002> which creates new files with permissions like
"-rw-rw-r--" or "-rwxrwxr-x".
+The default umask is C<022>. This is important because it
+means that directories and device nodes will be created with
+C<0644> or C<0755> mode even if you specify C<0777>.
+
See also L<umask(2)>, C<mknod>, C<mkdir>.
This call returns the previous umask.