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In virt-df and virt-alignment-scan, ensure that errors that happen in
worker threads are propagated all the way up and result in
exit(EXIT_FAILURE).
Note that this makes the align/test-virt-alignment-scan-guests.sh test
fail (for a genuine reason). This is fixed in the following commit.
This updates commit 8b90f55dc7.
This is the third rewrite of the virt-df program. It very much
follows the outline of the Perl program which this replaced in
libguestfs 1.7.14.
main.c - main program
domains.c - dealing with libvirt, only used if libvirt is around
at compile time
df.c - getting the stats from libguestfs
output.c - writing the output, CSV output
virt-df.h - header file
Note this also uses the shared options parsing code in
'fish/options.[ch]'.