[oe-commits] [openembedded-core] 03/43: wic: copy rootfs directory before changing fstab

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

commit b36502f7102ff1ea59593207ef4f12fbccd833a9
Author: Ed Bartosh <ed.bartosh at linux.intel.com>
AuthorDate: Tue Jun 20 12:13:46 2017 +0300

    wic: copy rootfs directory before changing fstab
    
    wic updates /etc/fstab on root partition if there are
    valid mount points in .wks
    
    When wic runs from bitbake this can cause incorrect results
    or even breakage of other tasks working with rootfs directory
    in parallel with do_image_wic.
    
    Implemented copying rootfs directory to a temporary location
    using copyhardlinktree before updating fstab to avoid conflicts with
    other tasks working with rootfs.
    
    Signed-off-by: Ed Bartosh <ed.bartosh at linux.intel.com>
---
 scripts/lib/wic/plugins/imager/direct.py | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/scripts/lib/wic/plugins/imager/direct.py b/scripts/lib/wic/plugins/imager/direct.py
index f20d843..1079c32 100644
--- a/scripts/lib/wic/plugins/imager/direct.py
+++ b/scripts/lib/wic/plugins/imager/direct.py
@@ -32,6 +32,8 @@ import uuid
 
 from time import strftime
 
+from oe.path import copyhardlinktree
+
 from wic import WicError
 from wic.filemap import sparse_copy
 from wic.ksparser import KickStart, KickStartError
@@ -115,12 +117,16 @@ class DirectPlugin(ImagerPlugin):
             fstab_lines = fstab.readlines()
 
         if self._update_fstab(fstab_lines, self.parts):
-            shutil.copyfile(fstab_path, fstab_path + ".orig")
+            # copy rootfs dir to workdir to update fstab
+            # as rootfs can be used by other tasks and can't be modified
+            new_rootfs = os.path.realpath(os.path.join(self.workdir, "rootfs_copy"))
+            copyhardlinktree(image_rootfs, new_rootfs)
+            fstab_path = os.path.join(new_rootfs, 'etc/fstab')
 
             with open(fstab_path, "w") as fstab:
                 fstab.writelines(fstab_lines)
 
-            return fstab_path
+            return new_rootfs
 
     def _update_fstab(self, fstab_lines, parts):
         """Assume partition order same as in wks"""
@@ -156,7 +162,10 @@ class DirectPlugin(ImagerPlugin):
         filesystems from the artifacts directly and combine them into
         a partitioned image.
         """
-        fstab_path = self._write_fstab(self.rootfs_dir.get("ROOTFS_DIR"))
+        new_rootfs = self._write_fstab(self.rootfs_dir.get("ROOTFS_DIR"))
+        if new_rootfs:
+            # rootfs was copied to update fstab
+            self.rootfs_dir['ROOTFS_DIR'] = new_rootfs
 
         for part in self.parts:
             # get rootfs size from bitbake variable if it's not set in .ks file
@@ -172,12 +181,7 @@ class DirectPlugin(ImagerPlugin):
                     if rsize_bb:
                         part.size = int(round(float(rsize_bb)))
 
-        try:
-            self._image.prepare(self)
-        finally:
-            if fstab_path:
-                shutil.move(fstab_path + ".orig", fstab_path)
-
+        self._image.prepare(self)
         self._image.layout_partitions()
         self._image.create()
 

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