[oe-commits] [openembedded-core] 05/13: scripts/lib/wic/engine: Fix cp's target path for ext* filesystems

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rpurdie pushed a commit to branch master-next
in repository openembedded-core.

commit 6efd114fe98c1209ecc4bc332f313bfa042bbb3a
Author: Leonardo Augusto <leobsd at gmail.com>
AuthorDate: Fri Feb 8 08:35:12 2019 -0800

    scripts/lib/wic/engine: Fix cp's target path for ext* filesystems
    
    Python subprocess' shell=True defaults to /bin/sh[1][2], which
    often refers to a POSIX-compliant shell. As the -e flag is
    not defined in the POSIX standard[3], some shells may
    interpret "-e" as the first argument to the echo command,
    causing the rest of the command line to fail.
    
    In this particular case, "echo -e 'cd {}'" is interpreted
    as "-e cd {}", which causes the first line of the command
    to fail, and causing cp to always place the source file
    in the filesystem's root.
    
    Replacing "echo -e" for a printf command makes this
    more portable.
    
    This issue only affects "wic cp" for ext* filesystems.
    
    [1] https://docs.python.org/2/library/subprocess.html
    [2] https://docs.python.org/3/library/subprocess.html
    [3] http://pubs.opengroup.org/onlinepubs/9699919799
    
    Signed-off-by: Leonardo Augusto <leobsd at gmail.com>
    Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 scripts/lib/wic/engine.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/lib/wic/engine.py b/scripts/lib/wic/engine.py
index 4662c66..97f5e84 100644
--- a/scripts/lib/wic/engine.py
+++ b/scripts/lib/wic/engine.py
@@ -331,7 +331,7 @@ class Disk:
     def copy(self, src, pnum, path):
         """Copy partition image into wic image."""
         if self.partitions[pnum].fstype.startswith('ext'):
-            cmd = "echo -e 'cd {}\nwrite {} {}' | {} -w {}".\
+            cmd = "printf 'cd {}\nwrite {} {}' | {} -w {}".\
                       format(path, src, os.path.basename(src),
                              self.debugfs, self._get_part_image(pnum))
         else: # fat

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