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This commit fixes a problem where it was not possible to replace /etc/shadow with a symlink to a e.g. a user partition where the shadow file is placed. This is required, e.g. for systems where the rootfs is mounted read-only but users should still be able to be added. Thus, if within an filesystem overlay setup a user tries to replace /etc/shadow with a symlink to the real file on a user partition a buildroot build stops with an error message because sed is called on the symlink instead of following the symlink. This commit fixes this shortcoming. Signed-off-by: Jens Maus <mail@jens-maus.de> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>