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The new "report_init_for_selection" is just a wrapper over
dm_report_init_with_selection that initializes reporting for selection
only. This means we're not going to do the actual reporting to output
for display and as such we intialize reporting as if no fields are reported
or sorted. The only fields "reported" are taken from the selection criteria
string and all such fields are marked as hidden automatically (FLD_HIDDEN flag).
These fields are used solely for selection criteria matching.
Also, modify existing report_object function that was used for reporting to
output for display. Now, it can either cause reporting to output or reporting
for selection only. The selection result is stored in struct selection_handle's
"selected" variable which can be handled further by any report_object caller.
This patch replaces "void *handle" with "struct processing_handle *handle"
in process_each_*, process_single_* and related functions.
The struct processing_handle consists of two handles inside now:
- the "struct selection_handle *selection_handle" used for
applying selection criteria while processing process_each_*,
process_single_* and related functions (patches using this
logic will follow)
- the "void* custom_handle" (this is actually the original handle
used before this patch - a pointer to custom data passed into
process_each_*, process_single_* and related functions).
The new dm_report_object_is_selected fn makes it possible to opt whether the
object reported should be displayed on output or not. Also, in addition to
that, it makes it possible to save the result of selection (either 0 or 1).
So dm_report_object_is_selected is simply more general form of object
reporting fn - combinations now allow for:
dm_report_object_is_selected(rh, object, 1, NULL):
This is exactly the original dm_report_object fn and it's fully equal
to it.
dm_report_object_is_selected(rh, object, 0, selected):
Do not display the result on output, but save info whether the object
is selected or not in 'selected' variable.
dm_report_object_is_selected(rh, object, 1, selected):
Display the result on output (if it passes selection criteria) and save
whether the object is selected or not in 'selected' variable.
dm_report_object(rh, object, 0, NULL):
This combination is not allowed - it will end up with internal error.
We're either interested in selection status or we want to display the
result on output or both, but never nothing of the two.
Once LVM_COMMAND_PROFILE environment variable is specified, the profile
referenced is used just like it was specified using "<lvm command> --commandprofile".
If both --commandprofile cmd line option and LVM_COMMAND_PROFILE env
var is used, the --commandprofile cmd line option gets preference.
