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The guestfs_write call can be used to create small files with
arbitrary 8 bit content, including \0 bytes.
This replaces and deprecates write-file, which cannot be modified
to use BufferIn because of an unfortunate choice in the ABI: the
size parameter to write-file, if zero, means that the daemon tries
to calculate the length of the buffer using strlen. However this
fails if we pass a zero-length buffer using BufferIn because then
the daemon tries to do strlen on a (really) zero length buffer, not
even containing a terminating \0 character, thus segfaulting.
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This commit fixes the 'Use%' field in the output so it matches what
coreutils' 'df' command would print.
Firstly we change the calculation to use the space available to root,
not the space available to non-root. This means it matches what 'df'
when run as root in the guest would show.
Secondly we display this rounded up to the next whole percent (ie. using
ceil), which is also what 'df' does.
Thirdly we change the regression test so it tests this.
Note that even with these changes you are not guaranteed to get precisely
the same figures from inside and outside the guest, as it depends on
how quiescent the guest is and how recently the superblock was synced.
Thanks: Rita Wu
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