[wic][PATCH] wic: exec_native_cmd: implement support for pseudo

[Ed Bartosh <ed.bartosh@linux.intel.com>]

Wic runs some tools through pseudo, which makes exec_native_cmd
to fail and throw cryptic error message when tool is not baked:
For example:
  Error: exec_cmd: 'export
  PSEUDO_PREFIX=/media/ssd/poky-build/tmp/sysroots/x86_64-linux/usr;export
  PSEUDO_LOCALSTATEDIR=/media/ssd/poky-build/tmp/work/qemux86-poky-linux/
...
  PSEUDO_PASSWD=/media/ssd/poky-build/tmp/work/qemux86-poky-linux/ ...
  PSEUDO_NOSYMLINKEXP=1;/media/ssd/poky-build/tmp/sysroots/ ...
  mkfs.ext4 -F -i 8192 /var/tmp/wic/build/rootfs_platform.7.ext4 -L
  platform -d
  /media/ssd/poky-build/tmp/work/qemux86-poky-linux/core-image-minimal/...
  returned '1' instead of 0

Made exec_native_cmd aware of pseudo and properly report
errors when command is not found.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
---
 scripts/lib/wic/kickstart/custom_commands/partition.py |  6 +++---
 scripts/lib/wic/utils/oe/misc.py                       | 18 +++++++++++-------
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/scripts/lib/wic/kickstart/custom_commands/partition.py b/scripts/lib/wic/kickstart/custom_commands/partition.py
index eee25a4..babc006 100644
--- a/scripts/lib/wic/kickstart/custom_commands/partition.py
+++ b/scripts/lib/wic/kickstart/custom_commands/partition.py
@@ -297,7 +297,7 @@ class Wic_PartData(FC4_PartData):
 
         mkfs_cmd = "mkfs.%s -F %s %s %s -d %s" % \
             (self.fstype, extra_imagecmd, rootfs, label_str, rootfs_dir)
-        exec_native_cmd(pseudo + mkfs_cmd, native_sysroot)
+        exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)
 
     def prepare_rootfs_btrfs(self, rootfs, oe_builddir, rootfs_dir,
                              native_sysroot, pseudo):
@@ -330,7 +330,7 @@ class Wic_PartData(FC4_PartData):
 
         mkfs_cmd = "mkfs.%s -b %d -r %s %s %s" % \
             (self.fstype, rootfs_size * 1024, rootfs_dir, label_str, rootfs)
-        exec_native_cmd(pseudo + mkfs_cmd, native_sysroot)
+        exec_native_cmd(mkfs_cmd, native_sysroot, pseudo=pseudo)
 
     def prepare_rootfs_vfat(self, rootfs, oe_builddir, rootfs_dir,
                             native_sysroot, pseudo):
@@ -378,7 +378,7 @@ class Wic_PartData(FC4_PartData):
         """
         squashfs_cmd = "mksquashfs %s %s -noappend" % \
                        (rootfs_dir, rootfs)
-        exec_native_cmd(pseudo + squashfs_cmd, native_sysroot)
+        exec_native_cmd(squashfs_cmd, native_sysroot, pseudo=pseudo)
 
     def prepare_empty_partition_ext(self, rootfs, oe_builddir,
                                     native_sysroot):
diff --git a/scripts/lib/wic/utils/oe/misc.py b/scripts/lib/wic/utils/oe/misc.py
index c6d2e5f..81239ac 100644
--- a/scripts/lib/wic/utils/oe/misc.py
+++ b/scripts/lib/wic/utils/oe/misc.py
@@ -89,7 +89,7 @@ def cmd_in_path(cmd, path):
 
     return bb.utils.which(path, cmd) != "" or False
 
-def exec_native_cmd(cmd_and_args, native_sysroot, catch=3):
+def exec_native_cmd(cmd_and_args, native_sysroot, catch=3, pseudo=""):
     """
     Execute native command, catching stderr, stdout
 
@@ -97,6 +97,12 @@ def exec_native_cmd(cmd_and_args, native_sysroot, catch=3):
 
     Always need to execute native commands as_shell
     """
+    # The reason -1 is used is because there may be "export" commands.
+    args = cmd_and_args.split(';')[-1].split()
+    msger.debug(args)
+
+    if pseudo:
+        cmd_and_args = pseudo + cmd_and_args
     native_paths = \
         "%s/sbin:%s/usr/sbin:%s/usr/bin" % \
         (native_sysroot, native_sysroot, native_sysroot)
@@ -104,18 +110,16 @@ def exec_native_cmd(cmd_and_args, native_sysroot, catch=3):
                            (native_paths, cmd_and_args)
     msger.debug("exec_native_cmd: %s" % cmd_and_args)
 
-    # The reason -1 is used is because there may be "export" commands.
-    args = cmd_and_args.split(';')[-1].split()
-    msger.debug(args)
-
     # If the command isn't in the native sysroot say we failed.
     if cmd_in_path(args[0], native_paths):
         ret, out = _exec_cmd(native_cmd_and_args, True, catch)
     else:
         ret = 127
 
-    if ret == 127: # shell command-not-found
-        prog = args[0]
+    prog = args[0]
+    # shell command-not-found
+    if ret == 127 \
+       or (pseudo and ret == 1 and out == "Can't find '%s' in $PATH." % prog):
         msg = "A native program %s required to build the image "\
               "was not found (see details above).\n\n" % prog
         recipe = NATIVE_RECIPES.get(prog)
-- 
2.1.4