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[Xen-devel] [PATCH] fix wrong path while calling pygrub and libxl-save-helper

in current xen x86_64, the default libexec directory is /usr/lib/xen/bin,
while the private binder is /usr/lib64/xen/bin. but some commands(pygrub,
libxl-save-helper) located in private binder directory is called from
libexec directory which lead to the following error:
1, for pygrub bootloader:
libxl: debug: libxl_bootloader.c:429:bootloader_disk_attached_cb:
/usr/lib/xen/bin/pygrub doesn't exist, falling back to config path
2, for libxl-save-helper:
libxl: cannot execute /usr/lib/xen/bin/libxl-save-helper: No such file or
libxl: error: libxl_utils.c:363:libxl_read_exactly: file/stream truncated
reading ipc msg header from domain 3 save/restore helper stdout pipe
libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: domain 3
save/restore helper [10222] exited with error status 255

there are two ways to fix above error. the first one is make such command
store in the /usr/lib/xen/bin and /usr/lib64/xen/bin(symbol link to
previous), e.g. qemu-dm. The second way is using private binder dir
instead of libexec dir. e.g. xenconsole.
For these cases, the latter one is suitable.

diff -r c4114a042410 -r 68e54ac2d3ed tools/libxl/libxl_bootloader.c
--- a/tools/libxl/libxl_bootloader.c    Fri Dec 21 17:05:38 2012 +0000
+++ b/tools/libxl/libxl_bootloader.c    Sat Jan 05 16:02:53 2013 +0800
@@ -419,7 +419,7 @@ static void bootloader_disk_attached_cb(
         const char *bltmp;
         struct stat st;
-        bltmp = libxl__abs_path(gc, bootloader, libxl__libexec_path());
+        bltmp = libxl__abs_path(gc, bootloader, libxl__private_bindir_path());
         /* Check to see if the file exists in this location; if not,
          * fall back to checking the path */
         LOG(DEBUG, "Checking for bootloader in libexec path: %s", bltmp);
diff -r c4114a042410 -r 68e54ac2d3ed tools/libxl/libxl_save_callout.c
--- a/tools/libxl/libxl_save_callout.c  Fri Dec 21 17:05:38 2012 +0000
+++ b/tools/libxl/libxl_save_callout.c  Sat Jan 05 16:02:53 2013 +0800
@@ -172,7 +172,7 @@ static void run_helper(libxl__egc *egc, 
     shs->stdout_what = GCSPRINTF("domain %"PRIu32" save/restore helper"
                                  " stdout pipe", domid);
-    *arg++ = getenv("LIBXL_SAVE_HELPER") ?: LIBEXEC "/" "libxl-save-helper";
+    *arg++ = getenv("LIBXL_SAVE_HELPER") ?: PRIVATE_BINDIR "/" 
     *arg++ = mode_arg;
     const char **stream_fd_arg = arg++;
     for (i=0; i<num_argnums; i++)

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