While looking into #345, we were seeing the error:
Error: error building image: chmod /etc/mtab: operation not permitted
during extraction of `amazonlinux:1`. I looked into why kaniko couldn't
extract this file properly, and found that it already existed as a
symlink pointing to /proc/mounts, which returned an error when we tried
to run chmod on it.
Confusingly, in the image the /etc/mtab is a regular file, not a
symlink.
I can think of two ways to solve this problem:
1. Whitelist /etc/mtab so that whatever already exists in the system
is used
2. Check if a regular file already exists, and hasn't been extracted yet,
before extracting
I went with option 1 because for option 2 we'd have to keep a list of
all files that had been extracted in memory.
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