[Bug 203873] [patch] make gzip(1) embedded-friendly and more compatible with GNU gzip

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203873

            Bug ID: 203873
           Summary: [patch] make gzip(1) embedded-friendly and more
                    compatible with GNU gzip
           Product: Base System
           Version: 10.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eugen at grosbein.net
          Keywords: patch

Created attachment 162210
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=162210&action=edit
patch for gzip

While running FreeBSD using space-constrained embedded platform like MIPS32
router, one may not have enough flash space for full-blown file system to keep
variable configuration files persistent between reboots. For example, there may
be only 64K or so flash space seen as /dev/map/cfg. This is not enough for
newfs(1) but enough to write gzip-compressed tar archive that can store
hundreds kilobytes of text configs like SSH host keys etc.

We need a way to check integrity of those raw 64Kbytes of data and "gzip -qt"
would do the job. However, "gzip -qt < /dev/map/cfg" does not work due to
hardware limitations and we need to use "dd bs=64k if=/dev/map/cfg | gzip -qt".
That feeds gzip with our compressed data and some trailing garbage.

Our gzip ignores trailing garbage but returns exit status 1 (fatal error) even
if CRC matches. GNU gzip returns exit status 2 (just warning) in such case.
Attached patch makes our gzip return 2 in case of ignored trailing garbage.

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