[Rpm-maint] [rpm-software-management/rpm] Add support to rpmspec for reading content via stdin (Issue #4023)

[Коренберг Марк]

socketpair left a comment (rpm-software-management/rpm#4023)

@dmnks The quick-fix - if non-plainfile detected (via `fstat()`) is to create a temporary file (preferably O_TMPFILE|O_CLOEXEC. If not - `O_CREAT|O_EXCL|O_CLOEXEC` + `unlink()` immediately) and copy contents there. Next use the temporary file as usual. More complex to implement - improve buffering in memory while reading file -- i.e. all `seek()`s back and `read()`s should read from application's memory, not from FD. 

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