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As we start refactoring the code to break dependencies (see doc/refactoring.txt),
I want us to use full paths in the includes (eg, #include "base/data-struct/list.h").
This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in
metadata/ from base/
API for strtod() or strtoul() needs reset of errno, before it's being
called. So add missing resets in missing places and some also some
errno validation for out-of-range numbers.
Add function to adjust printing of percent values in better way.
Rounding here is going along following rules:
0% & 100% are always clearly reported with .0 decimal points.
Values slightly above 0% we make sure a nearest bigger
non zero value with given precission is printed
(i.e. 0.01 for %.2f will be shown)
For values closely approaching 100% we again detect and adjust value
that is less then 100 when printed.
(i.e. 99.99 for %.2f will be shown).
For other values we are leaving them with standard rounding mechanism
since we care mainly about corner values 0 & 100 which need to be
printed precisely.
The dm_report_group_output_and_pop_all calls dm_report_output and
dm_report_group_pop for all the items that are currently in report
group. This is just a shortcut that makes it easier to output and
pop group's content so the group handle can be reused again without
a need to initialize and configure it again.
The functionality of dm_report_group_output_and_pop_all is the
same as dm_report_destroy but without destroying the report group
handle.
This patch moves printing of starting '{' character for JSON output up
untili it's known there's any further output following - either the
content or ending '}' character.
Also, remove unnecessary switch for different report group types and
calling individual functions to handle dm_report_group_create as that
code is shared for all existing types at the moment.
Calling dm_report_destroy_rows makes it possible to destroy any report
content we have but at the same time it doesn't destroy the report
handle itself, thus it's possible to reuse that handle again for new
report content.
Functionally, this is the same as calling dm_report_output with the
report handle but omitting the output iself. This functionality may
be useful if we, for whatever reason, need to discard the report
content and start a fresh new one but with the same report configuration
and initialization and thus we can just reuse the existing handle.
This fixes commit 0ba5f4b8e9 which moved
field recalculation (field width and sort position) from
dm_report_object to dm_report_output but it didn't handle the case when
dm_report_column_headings was used separately to report headings (before
dm_report_outpout call) and hence we ended up with intial widths for
fields in the headings.
If we're using dm_report_column_headings, we need to recalculate
fields if we haven't done so yet, the same way as we do in
dm_report_output.
Uninitialized variables (UNINIT) /safe/guest2/covscan/LVM2.2.02.158/tools/toollib.c: 3520 in _process_pvs_in_vgs()
Uninitialized variables (UNINIT) Using uninitialized value "do_report_ret_code".
Null pointer dereferences (REVERSE_INULL) /safe/guest2/covscan/LVM2.2.02.158/libdm/libdm-report.c: 4745 in dm_report_output()
Null pointer dereferences (REVERSE_INULL) Null-checking "rh" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
Incorrect expression (MISSING_COMMA) /safe/guest2/covscan/LVM2.2.02.158/lib/log/log.c: 280 in _get_log_level_name()
Incorrect expression (MISSING_COMMA) In the initialization of "log_level_names", a suspicious concatenated string ""noticeinfo"" is produced.
Null pointer dereferences (FORWARD_NULL) /safe/guest2/covscan/LVM2.2.02.158/tools/reporter.c: 816 in_get_report_options()
Null pointer dereferences (FORWARD_NULL) Comparing "mem" to null implies that "mem" might be null.
This fixes commit f50d4011cd which
introduced a problem when using older lvm2 code with newer libdm.
In this case, the old LVM didn't recognize new _LOG_BYPASS_REPORT flag
that libdm-report code used. This ended up with no output at all
from libdm where log_print_bypass_report was called because the
_LOG_BYPASS_REPORT was not masked properly in lvm2's print_log fn
which was called as callback function for logging.
With this patch, the lvm2 registers separate print_log_libdm logging
function for libdm instead. The print_log_libdm is exactly the same
as print_log (used throughout lvm2 code) but it checks whether we're
printing common line on output where "common" means not going to stderr,
not a warning and not an error and if we are, it adds the
_LOG_BYPASS_REPORT flag so the log_print goes directly to output, not
to any log report.
So this achieves the same goal as in f50d4011cd,
just doing it in a way that newer libdm is still compatible with older
lvm2 code (libdm-report is the only code using log_print).
Looking at the opposite mixture - older libdm with newer lvm2 code,
that won't be compilable because the new log report functionality
that is in lvm2 also requires new dm_report_group_* libdm functions
so we don't need to care here.
The DM_REPORT_OUTPUT_MULTIPLE_TIMES instructs reporting code to
keep rows even after dm_report_output call - the rows are not
destroyed in this case which makes it possible to call dm_report_output
multiple times.
This allows for moving parts of the code from dm_report_object to
dm_report_output which is important for subsequent patches that allow
for repeated dm_report_output, not destroying rows on each
dm_report_output call.
log_print is used during cmd line processing to log the result of the
operation (e.g. "Volume group vg successfully changed" and similar).
We don't want output from log_print to be interleaved with current
reports from group where log is reported as well. Also, the information
printed by log_print belongs to the log report too, so it should be
rerouted to log report if it's set.
Since the code in libdm-report which is responsible for doing the report
output uses log_print too, we need to use a different kind of log_print
which bypasses any log report currently used for logging (...simply,
we can't call log_print to output the log report itself which in turn
would again reroute to report - the report would never get on output
this way).
This patch introduces DM_REPORT_GROUP_JSON report group type. When using
this group type and when pushing a report to such a group, these flags
are automatically unset:
DM_REPORT_OUTPUT_ALIGNED
DM_REPORT_OUTPUT_HEADINGS
DM_REPORT_OUTPUT_COLUMNS_AS_ROWS
...and this flag is set:
DM_REPORT_OUTPUT_BUFFERED
The whole group is encapsulated in { } for the outermost JSON object
and then each report is reported on output as array of objects where
each object is the row from report:
{
"report_name1": [
{field1="value", field2="value",...},
{field1="value", field2="value",...}
...
],
"report_name2": [
{field1="value", field2="value",...},
{field1="value", field2="value",...}
...
]
...
}
This patch introduces DM_REPORT_GROUP_BASIC report group type. This
type has exactly the classical output format as we know from before
introduction of report groups. However, in addition to that, it allows
to put several reports into a group - this is the very basic grouping
scheme that doesn't change the output format itself:
Report: report1_name
Header1 Header2 ...
value value ...
value value ...
... ... ...
Report: report2_name
Header1 Header2 ...
value value ...
value value ...
... ... ...
There's no change in output for this report group type - with this type,
we only make sure there's always only one report in a group at a time,
not more.
This patch introduces DM report group (represented by dm_report_group
structure) that is used to group several reports to make a whole. As a
whole, all the reports in the group follow the same settings and/or
formatting used on output and it controls that the output is properly
ordered (e.g. the output from different reports is not interleaved
which would break readability and/or syntax of target output format
used for the whole group).
To support this feature, there are 4 new functions:
- dm_report_group_create
- dm_report_group_push
- dm_report_group_pop
- dm_report_group_destroy
From the naming used (dm_report_group_push/pop), it's clear the reports
are pushed onto a stack. The rule then is that only the report on top
of the stack can be reported (that means calling dm_report_output).
This way we make sure that the output is not interleaved and provides
determinism and control over the output.
Different formats may allow or disallow some of the existing report
flags controlling output itself (DM_REPORT_OUTPUT_*) to be set or not so
once the report is pushed to a group, the grouping code makes sure that
all the reports have compatible flags set and then these flags are
restored once each report is popped from the report group stack.
We also allow to push/pop non-report item in which case such an item
creates a structure (e.g. to put several reports together with any
opening and/or closing lines needed on output which pose as extra
formatting structure besides formatting the reports).
The dm_report_group_push function accepts an argument to pass any
format-specific data needed (e.g. handle, name, structures passed
along while working with reports...).
We can call dm_report_output directly anytime we need (with the only
restriction that we can call dm_report_output only for the report that
is currently on top of the group's stack). Or we don't need to call
dm_report_output explicitly in which case all the reports in a stack are
reported on output automatically once we call dm_report_group_destroy.
dm_report_compact_given_fields is the same as dm_report_compact_fields,
but it processes only given fields, not all the fields in the report
like dm_report_compact_field does.
$ lvs -o name,tags vg
LV LV Tags
lvol0
lvol1 mytag
Before this patch:
$ lvs -o name,tags vg -S 'tags=""'
Failed to parse string list value for selection field lv_tags.
Selection syntax error at 'tags=""'.
Use 'help' for selection to get more help.
(and the same for -S 'tags={}' and -S 'tags=[]')
With this patch applied:
$ lvs -o name,tags vg -S 'tags=""'
LV LV Tags
lvol0
(and the same for -S 'tags={}' and -S 'tags=[]')
For repeating reports field widths should be re-calculated for
each report interval. Not doing so will cause a single row with
wide field data to cause all subsequent rows to share the width:
Name RgID ArID R/s W/s Histogram Bounds
vg_hex-lv_home 0 0 4522.00 834.00 0s: 991, 2ms: 152, 4ms: 161, 6ms: 4052 0s, 2ms, 4ms, 6ms
vg_hex-lv_swap 0 0 0.00 0.00 0s: 0, 2ms: 0, 4ms: 0, 6ms: 0 0s, 2ms, 4ms, 6ms
vg_hex-lv_root 0 0 1754.00 683.00 0s: 369, 2ms: 65, 4ms: 90, 6ms: 1913 0s, 2ms, 4ms, 6ms
luks-79733921-3f68-4c92-9eb7-d0aca4c6ba3e 0 0 4522.00 868.00 0s: 985, 2ms: 152, 4ms: 161, 6ms: 4092 0s, 2ms, 4ms, 6ms
vg_hex-lv_images 0 0 0.00 0.00 0s: 0, 2ms: 0, 4ms: 0, 6ms: 0 0s, 2ms, 4ms, 6ms
Name RgID ArID R/s W/s Histogram Bounds
vg_hex-lv_home 0 0 0.00 0.00 0s: 0, 2ms: 0, 4ms: 0, 6ms: 0 0s, 2ms, 4ms, 6ms
vg_hex-lv_swap 0 0 0.00 0.00 0s: 0, 2ms: 0, 4ms: 0, 6ms: 0 0s, 2ms, 4ms, 6ms
vg_hex-lv_root 0 0 0.00 2.00 0s: 1, 2ms: 0, 4ms: 0, 6ms: 1 0s, 2ms, 4ms, 6ms
luks-79733921-3f68-4c92-9eb7-d0aca4c6ba3e 0 0 0.00 0.00 0s: 0, 2ms: 0, 4ms: 0, 6ms: 0 0s, 2ms, 4ms, 6ms
vg_hex-lv_images 0 0 0.00 0.00 0s: 0, 2ms: 0, 4ms: 0, 6ms: 0 0s, 2ms, 4ms, 6ms
^^^^^^^^^^^^^^^^^
This is especially significant for the current histogram fields:
depending on the time since the last clear operation the first
report iteration may contain very large values leading to a very
large minimum field width. Without resetting field widths this
large minimum field width value is used for all subsequent rows.
