[Libguestfs] [PATCH v2] virt-ls: support drive letters on Windows

[Richard W.M. Jones]

On Mon, Mar 23, 2015 at 05:44:35PM +0100, Maros Zatko wrote:
> ---
>  cat/ls.c | 32 +++++++++++++++++++++++++++++++-
>  1 file changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/cat/ls.c b/cat/ls.c
> index 9161fb6..b7a99b2 100644
> --- a/cat/ls.c
> +++ b/cat/ls.c
> @@ -37,6 +37,7 @@
>  
>  #include "options.h"
>  #include "visit.h"
> +#include "windows.h"
>  
>  /* Currently open libguestfs handle. */
>  guestfs_h *g;
> @@ -76,6 +77,8 @@ static void output_int64_uid (int64_t);
>  static void output_string (const char *);
>  static void output_string_link (const char *);
>  
> +static const char *get_windows_root ();
> +
>  static void __attribute__((noreturn))
>  usage (int status)
>  {
> @@ -176,6 +179,7 @@ main (int argc, char *argv[])
>  #define MODE_LS_R  2
>  #define MODE_LS_LR (MODE_LS_L|MODE_LS_R)
>    int mode = 0;
> +  CLEANUP_FREE const char * win_root;
>  
>    g = guestfs_create ();
>    if (g == NULL) {
> @@ -371,10 +375,18 @@ main (int argc, char *argv[])
>    free_drives (drvs);
>    free_mps (mps);
>  
> +  win_root = get_windows_root ();
> +
>    unsigned errors = 0;
>  
>    while (optind < argc) {
> -    const char *dir = argv[optind];
> +    CLEANUP_FREE const char *dir;
> +
> +    if (win_root != NULL) {
> +      dir = windows_path (g, win_root, argv[optind], 1 /* readonly */ );
> +    } else {
> +      dir = safe_strdup (g, argv[optind]);
> +    }
>  
>      switch (mode) {
>      case 0:                     /* no -l or -R option */
> @@ -409,6 +421,24 @@ main (int argc, char *argv[])
>    exit (errors == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
>  }
>  
> +static const char *
> +get_windows_root (void)
> +{
> +  CLEANUP_FREE_STRING_LIST char **roots = NULL;
> +  const char *root;
> +
> +  roots = guestfs_inspect_get_roots (g);

This breaks if inspector == 0 (eg. if the -m option is given).  It
will actually assert-fail on the next line.

I strongly suggest you look at cat/cat.c and just copy what that
program does.

Also you need to update the documentation.

Rich.

> +  assert (roots);
> +  assert (roots[0] != NULL);
> +  assert (roots[1] == NULL);
> +  root = safe_strdup(g, roots[0]);
> +
> +  if (is_windows (g, root))
> +    return root;
> +  else
> +    return NULL;
> +}
> +
>  static int
>  do_ls (const char *dir)
>  {
> -- 
> 1.9.3
> 
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-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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