Commits on Jul 9, 2019

1. Allow building images on NFS-mounted clones …

   Prior to this change, `build_debian.sh` would generate a Debian
   filesystem in `./fsroot`. This needs root permissions, and one of the
   tests that is performed is whether the user can create a character
   special file in the filesystem (using mknod).
   
   On most NFS deployments, `root` is the least privileged user, and cannot
   run mknod. Also, attempting to run commands like rm or mv as root would
   fail due to permission errors, since the root user gets mapped to an
   unprivileged user like `nobody`.
   
   This commit changes the location of the Debian filesystem to `/fsroot`,
   which is a tmpfs mount within the slave Docker. The default squashfs,
   docker tarball and zip files are also created within /tmp, before being
   copied back to /sonic as the regular user.
   
   The side effect of this change is that the contents of `/fsroot` are no
   longer available once the slave container exits, however they are
   available within the squashfs image.
   
   Signed-off-by: Nirenjan Krishnan <Nirenjan.Krishnan@dell.com>

   

   nirenjan committed Jul 9, 2019
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