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Code Releases Activity

select: add FLD_UNCOMPARABLE flag for fields which can't be compared

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A field where it has no meaning to do any type of comparison is the
implicit "help" or "?" field. The error given was a bit cryptic
before this patch, the FLD_UNCOMPARABLE flag makes it easier to identify
this situation anywhere in the code and provide much better error message.
This flag can be applied to other fields that may appear in the future -
mostly usable for implicit fields as they always have special purpose
(so we're not exporting it in libdevmapper for now - usual reporting
fields don't need this).

Before this patch:

$ vgs -S help=1
  dm_report_object: no data assigned to field help
  dm_report_object: no data assigned to field help

(...which is true actually, but let's provide something better...)

With this patch applied:

$vgs -S help=1
  Selection field is uncomparable: help.
  Selection syntax error at 'help=1'.

$vgs -S '(name=vg && help=1) || vg_size > 1g'
  Selection field is uncomparable: help.
  Selection syntax error at 'help=1) || vg_size > 1g'.
This commit is contained in:
Peter Rajnoha 2014-06-23 09:57:46 +02:00
parent c1c2e838e8
commit 2d48ef7f04
1 changed files with 24 additions and 13 deletions
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37
libdm/libdm-report.c
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@ -84,13 +84,14 @@ struct op_def {
const char *desc;
};
#define FLD_CMP_MASK 0x00FF0000
#define FLD_CMP_EQUAL 0x00010000
#define FLD_CMP_NOT 0x00020000
#define FLD_CMP_GT 0x00040000
#define FLD_CMP_LT 0x00080000
#define FLD_CMP_REGEX 0x00100000
#define FLD_CMP_NUMBER 0x00200000
#define FLD_CMP_MASK 0x00FF0000
#define FLD_CMP_UNCOMPARABLE 0x00010000
#define FLD_CMP_EQUAL 0x00020000
#define FLD_CMP_NOT 0x00040000
#define FLD_CMP_GT 0x00080000
#define FLD_CMP_LT 0x00100000
#define FLD_CMP_REGEX 0x00200000
#define FLD_CMP_NUMBER 0x00400000
/*
* #define FLD_CMP_STRING 0x00400000
* We could defined FLD_CMP_STRING here for completeness here,
@ -227,15 +228,15 @@ static const struct dm_report_object_type _implicit_common_report_types[] = {
};
static const struct dm_report_field_type _implicit_common_report_fields[] = {
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER, 0, 8, COMMON_FIELD_HELP_ID, "Help", _no_report_fn, "Show help." },
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER, 0, 8, COMMON_FIELD_HELP_ALT_ID, "Help", _no_report_fn, "Show help." },
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER | FLD_CMP_UNCOMPARABLE, 0, 8, COMMON_FIELD_HELP_ID, "Help", _no_report_fn, "Show help." },
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER | FLD_CMP_UNCOMPARABLE, 0, 8, COMMON_FIELD_HELP_ALT_ID, "Help", _no_report_fn, "Show help." },
{ 0, 0, 0, 0, "", "", 0, 0}
};
static const struct dm_report_field_type _implicit_common_report_fields_with_selection[] = {
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER, 0, 8, COMMON_FIELD_SELECTED_ID, "Selected", _selected_disp, "Item passes selection criteria." },
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER, 0, 8, COMMON_FIELD_HELP_ID, "Help", _no_report_fn, "Show help." },
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER, 0, 8, COMMON_FIELD_HELP_ALT_ID, "Help", _no_report_fn, "Show help." },
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER | FLD_CMP_UNCOMPARABLE, 0, 8, COMMON_FIELD_HELP_ID, "Help", _no_report_fn, "Show help." },
{ COMMON_REPORT_TYPE, DM_REPORT_FIELD_TYPE_NUMBER | FLD_CMP_UNCOMPARABLE, 0, 8, COMMON_FIELD_HELP_ALT_ID, "Help", _no_report_fn, "Show help." },
{ 0, 0, 0, 0, "", "", 0, 0}
};
@ -2452,8 +2453,18 @@ static struct selection_node *_parse_selection(struct dm_report *rh,
goto bad;
}
ft = implicit ? &_implicit_report_fields[field_num]
: &rh->fields[field_num];
if (implicit) {
ft = &_implicit_report_fields[field_num];
if (ft->flags & FLD_CMP_UNCOMPARABLE) {
c = we[0];
tmp = (char *) we;
tmp[0] = '\0';
log_error("Selection field is uncomparable: %s.", ws);
tmp[0] = c;
goto bad;
}
} else
ft = &rh->fields[field_num];
/* comparison operator */
if (!(flags = _tok_op_cmp(we, &last))) {