gitignore: report access errors of exclude files
When we try to access gitignore files, we check for their existence with a call to "access". We silently ignore missing files. However, if a file is not readable, this may be a configuration error; let's warn the user. For $GIT_DIR/info/excludes or core.excludesfile, we can just use access_or_warn. However, for per-directory files we actually try to open them, so we must add a custom warning. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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