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keyval: New keyval_parse()

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keyval_parse() parses KEY=VALUE,... into a QDict.  Works like
qemu_opts_parse(), except:

* Returns a QDict instead of a QemuOpts (d'oh).

* Supports nesting, unlike QemuOpts: a KEY is split into key
  fragments at '.' (dotted key convention; the block layer does
  something similar on top of QemuOpts).  The key fragments are QDict
  keys, and the last one's value is updated to VALUE.

* Each key fragment may be up to 127 bytes long.  qemu_opts_parse()
  limits the entire key to 127 bytes.

* Overlong key fragments are rejected.  qemu_opts_parse() silently
  truncates them.

* Empty key fragments are rejected.  qemu_opts_parse() happily
  accepts empty keys.

* It does not store the returned value.  qemu_opts_parse() stores it
  in the QemuOptsList.

* It does not treat parameter "id" specially.  qemu_opts_parse()
  ignores all but the first "id", and fails when its value isn't
  id_wellformed(), or duplicate (a QemuOpts with the same ID is
  already stored).  It also screws up when a value contains ",id=".

* Implied value is not supported.  qemu_opts_parse() desugars "foo" to
  "foo=on", and "nofoo" to "foo=off".

* An implied key's value can't be empty, and can't contain ','.

I intend to grow this into a saner replacement for QemuOpts.  It'll
take time, though.

Note: keyval_parse() provides no way to do lists, and its key syntax
is incompatible with the __RFQDN_ prefix convention for downstream
extensions, because it blindly splits at '.', even in __RFQDN_.  Both
issues will be addressed later in the series.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1488317230-26248-4-git-send-email-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2017-02-28 22:26:49 +01:00
parent 112c944655
commit d454dbe0ee
6 changed files with 419 additions and 0 deletions
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3
tests/Makefile.include
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@ -94,6 +94,8 @@ check-unit-y += tests/check-qom-proplist$(EXESUF)
gcov-files-check-qom-proplist-y = qom/object.c
check-unit-y += tests/test-qemu-opts$(EXESUF)
gcov-files-test-qemu-opts-y = util/qemu-option.c
check-unit-y += tests/test-keyval$(EXESUF)
gcov-files-test-keyval-y = util/keyval.c
check-unit-y += tests/test-write-threshold$(EXESUF)
gcov-files-test-write-threshold-y = block/write-threshold.c
check-unit-y += tests/test-crypto-hash$(EXESUF)
@ -720,6 +722,7 @@ tests/vhost-user-test$(EXESUF): tests/vhost-user-test.o $(test-util-obj-y) \
$(chardev-obj-y)
tests/qemu-iotests/socket_scm_helper$(EXESUF): tests/qemu-iotests/socket_scm_helper.o
tests/test-qemu-opts$(EXESUF): tests/test-qemu-opts.o $(test-util-obj-y)
tests/test-keyval$(EXESUF): tests/test-keyval.o $(test-util-obj-y)
tests/test-write-threshold$(EXESUF): tests/test-write-threshold.o $(test-block-obj-y)
tests/test-netfilter$(EXESUF): tests/test-netfilter.o $(qtest-obj-y)
tests/test-filter-mirror$(EXESUF): tests/test-filter-mirror.o $(qtest-obj-y)