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07369cb77a
The original idea (suggested by Al Viro) was to fork and chroot into the sysroot and read the file from there. Because of the separate process being chrooted, absolute links would be resolved correctly. The slightly modified idea is to open the file in the daemon process (but temporarily chrooted, so symlinks resolve correctly), fork, and have the subprocess just be responsible for copying the file. (Strictly speaking we don't need to fork, but this implementation is simpler). This commit just includes the changes needed to the command*() functions in daemon/guestfsd.c and adds an absolute symlink to the test ISO for testing it. Later commits will fix the broken daemon commands themselves.