Re: [U-Boot] [PATCH] pxe: fix handling of absolute paths

[Ian Campbell]

On Fri, 2013-10-18 at 13:04 -0500, Rob Herring wrote:
> From: Rob Herring 
> 
> pxelinux and syslinux differ in their handling of absolute paths in menu
> files. A pxelinux path is aways prepended with the bootfile path while
> syslinux allows for absolute paths. u-boot was always treating a leading
> / as an absolute path breaking some pxelinux setups. Fix this by adding
> a flag to distinguish pxelinux vs. syslinux behavior.
> 
> Reported-by: Ian Campbell 
> Signed-off-by: Rob Herring 

You could also have Tested- or Acked-by from me if desired.

I also took a gander at the syslinux code and found that
core/fs/pxe/pxe.c:get_prefix() sets the initial cwd to the prefix. The
lookups are done relative to this unless the path is a URL (roughly
means it contains "::", see code/comments around the use of
PXE_RELATIVE)). In particular a leading "/" isn't specially treated as
far as I can see...

Ian.

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[U-Boot] [PATCH] pxe: fix handling of absolute paths

[Rob Herring]

From: Rob Herring 

pxelinux and syslinux differ in their handling of absolute paths in menu
files. A pxelinux path is aways prepended with the bootfile path while
syslinux allows for absolute paths. u-boot was always treating a leading
/ as an absolute path breaking some pxelinux setups. Fix this by adding
a flag to distinguish pxelinux vs. syslinux behavior.

Reported-by: Ian Campbell 
Signed-off-by: Rob Herring 
---
 common/cmd_pxe.c | 9 -
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/common/cmd_pxe.c b/common/cmd_pxe.c
index 79d3a06..db6b156 100644
--- a/common/cmd_pxe.c
+++ b/common/cmd_pxe.c
@@ -25,6 +25,8 @@ const char *pxe_default_paths[] = {
NULL
 };
 
+static bool is_pxe;
+
 /*
  * Like getenv, but prints an error if envvar isn't defined in the
  * environment.  It always returns what getenv does, so it can be used in
@@ -84,7 +86,8 @@ static int get_bootfile_path(const char *file_path, char 
*bootfile_path,
char *bootfile, *last_slash;
size_t path_len = 0;
 
-   if (file_path[0] == '/')
+   /* Only syslinux allows absolute paths */
+   if (file_path[0] == '/' && !is_pxe)
goto ret;
 
bootfile = from_env("bootfile");
@@ -1472,6 +1475,8 @@ int do_pxe(cmd_tbl_t *cmdtp, int flag, int argc, char * 
const argv[])
if (argc < 2)
return CMD_RET_USAGE;
 
+   is_pxe = true;
+
/* drop initial "pxe" arg */
argc--;
argv++;
@@ -1504,6 +1509,8 @@ int do_sysboot(cmd_tbl_t *cmdtp, int flag, int argc, char 
* const argv[])
char *filename;
int prompt = 0;
 
+   is_pxe = false;
+
if (strstr(argv[1], "-p")) {
prompt = 1;
argc--;
-- 
1.8.1.2

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