You posted the same message on the libvirt-user list, which would have been
sufficient for this query. For the record, it was answered there
https://www.redhat.com/archives/libvirt-users/2020-January/msg3.html
Regards,
Jim
On 12/30/19 8:30 AM, Arthur Borsboom wrote:
> Hello,
>
> I am
Hi Daniel,
Thanks for review!
Br
Huaqiang
> -Original Message-
> From: Daniel P. Berrangé
> Sent: Monday, January 6, 2020 10:16 PM
> To: Wang, Huaqiang
> Cc: libvir-list@redhat.com
> Subject: Re: [PATCHv2 1/2] util, resctrl: using 64bit interface instead of
> 32bit
> for counters
>
Hi Daniel,
Thanks for your hard work and review!
Br
Huaqiang
> -Original Message-
> From: Daniel P. Berrangé
> Sent: Monday, January 6, 2020 10:17 PM
> To: Wang, Huaqiang
> Cc: libvir-list@redhat.com
> Subject: Re: [PATCHv2 2/2] Introduce command 'virsh domstats --memory'
> for
This patch remove the remaining unneeded labels in 'util'
files:
virnetdev.c
virnetdevmacvlan.c
virnetdevtap.c
virtpm.c
virtypedparam.c
viruuid.c
Signed-off-by: Daniel Henrique Barboza
---
src/util/virnetdev.c| 13 -
src/util/virnetdevmacvlan.c | 3 +--
Signed-off-by: Daniel Henrique Barboza
---
src/vz/vz_sdk.c | 102 ++--
1 file changed, 37 insertions(+), 65 deletions(-)
diff --git a/src/vz/vz_sdk.c b/src/vz/vz_sdk.c
index c98542c244..b8ac055574 100644
--- a/src/vz/vz_sdk.c
+++ b/src/vz/vz_sdk.c
@@
Signed-off-by: Daniel Henrique Barboza
---
examples/c/misc/hellolibvirt.c | 28 +---
examples/c/misc/openauth.c | 22 ++
2 files changed, 15 insertions(+), 35 deletions(-)
diff --git a/examples/c/misc/hellolibvirt.c
Signed-off-by: Daniel Henrique Barboza
---
src/locking/lock_driver_lockd.c | 16
1 file changed, 4 insertions(+), 12 deletions(-)
diff --git a/src/locking/lock_driver_lockd.c b/src/locking/lock_driver_lockd.c
index 339e2f6949..393154bb3c 100644
---
This patch remove unneeded labels for the following files:
qemu_capabilities.c
qemu_domain_address.c
qemu_hostdev.c
qemu_hotplug.c
qemu_migration_cookie.c
qemu_migration_params.c
Next patch will handle the remaining QEMU files that can be
cleaned up.
Signed-off-by: Daniel Henrique Barboza
---
Signed-off-by: Daniel Henrique Barboza
---
src/storage/storage_backend_iscsi_direct.c | 4 +---
src/storage/storage_driver.c | 4 ++--
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/src/storage/storage_backend_iscsi_direct.c
Signed-off-by: Daniel Henrique Barboza
---
tests/qemumonitortestutils.c | 15 +--
tests/testutilsqemu.c| 8 ++--
tests/virhostdevtest.c | 14 +-
3 files changed, 12 insertions(+), 25 deletions(-)
diff --git a/tests/qemumonitortestutils.c
Signed-off-by: Daniel Henrique Barboza
---
src/util/virsysinfo.c | 54 ++-
1 file changed, 17 insertions(+), 37 deletions(-)
diff --git a/src/util/virsysinfo.c b/src/util/virsysinfo.c
index e5af4f25e0..c526c0322f 100644
--- a/src/util/virsysinfo.c
+++
Signed-off-by: Daniel Henrique Barboza
---
src/nwfilter/nwfilter_ebiptables_driver.c | 11 ---
src/nwfilter/nwfilter_learnipaddr.c | 3 +--
2 files changed, 5 insertions(+), 9 deletions(-)
diff --git a/src/nwfilter/nwfilter_ebiptables_driver.c
Signed-off-by: Daniel Henrique Barboza
---
src/vbox/vbox_MSCOMGlue.c | 11 +--
src/vbox/vbox_snapshot_conf.c | 9 +++--
2 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/src/vbox/vbox_MSCOMGlue.c b/src/vbox/vbox_MSCOMGlue.c
index 18a291a0d8..5cc3f5c7c8 100644
---
Signed-off-by: Daniel Henrique Barboza
---
src/hyperv/hyperv_wmi.c | 15 +--
1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/src/hyperv/hyperv_wmi.c b/src/hyperv/hyperv_wmi.c
index 7d56677588..ca2d29733e 100644
--- a/src/hyperv/hyperv_wmi.c
+++
Signed-off-by: Daniel Henrique Barboza
---
src/logging/log_handler.c | 7 ++-
src/logging/log_manager.c | 14 --
2 files changed, 6 insertions(+), 15 deletions(-)
diff --git a/src/logging/log_handler.c b/src/logging/log_handler.c
index 29ea3011b9..030c9d66e3 100644
---
Signed-off-by: Daniel Henrique Barboza
---
src/security/security_dac.c | 26 ++---
src/security/security_selinux.c | 26 ++---
src/security/virt-aa-helper.c | 41 ++---
3 files changed, 41 insertions(+), 52 deletions(-)
diff
Signed-off-by: Daniel Henrique Barboza
---
src/secret/secret_driver.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/secret/secret_driver.c b/src/secret/secret_driver.c
index 096672f114..5a93c3af82 100644
--- a/src/secret/secret_driver.c
+++
Signed-off-by: Daniel Henrique Barboza
---
src/test/test_driver.c | 51 ++
1 file changed, 22 insertions(+), 29 deletions(-)
diff --git a/src/test/test_driver.c b/src/test/test_driver.c
index f8e08dcf07..1908185743 100644
--- a/src/test/test_driver.c
+++
This patch finishes cleaning up unneeded labels on the
QEMU files.
Signed-off-by: Daniel Henrique Barboza
---
src/qemu/qemu_command.c | 93 +++--
src/qemu/qemu_domain.c | 11 ++---
src/qemu/qemu_driver.c | 32 +-
3 files changed, 55
Signed-off-by: Daniel Henrique Barboza
---
src/remote/remote_daemon_config.c | 101 +++---
1 file changed, 49 insertions(+), 52 deletions(-)
diff --git a/src/remote/remote_daemon_config.c
b/src/remote/remote_daemon_config.c
index 1d739caabf..0ecc49f179 100644
---
Labels that are simply a jump to a 'return' call are
unneeded and can be replaced by the return value instead.
Signed-off-by: Daniel Henrique Barboza
---
src/bhyve/bhyve_device.c| 13 -
src/bhyve/bhyve_parse_command.c | 47 +
2 files changed, 23
Signed-off-by: Daniel Henrique Barboza
---
src/openvz/openvz_conf.c | 11 --
src/openvz/openvz_driver.c | 42 +++---
2 files changed, 21 insertions(+), 32 deletions(-)
diff --git a/src/openvz/openvz_conf.c b/src/openvz/openvz_conf.c
index
Remove unneeded labels from the following conf files:
cpu_conf.c
domain_addr.c
interface_conf.c
nwfilter_params.c
Signed-off-by: Daniel Henrique Barboza
---
src/conf/cpu_conf.c| 36
src/conf/domain_addr.c | 9 -
Signed-off-by: Daniel Henrique Barboza
---
src/cpu/cpu_ppc64.c | 12
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/src/cpu/cpu_ppc64.c b/src/cpu/cpu_ppc64.c
index 818f1ec699..6b3590ab6a 100644
--- a/src/cpu/cpu_ppc64.c
+++ b/src/cpu/cpu_ppc64.c
@@ -81,7 +81,6 @@
Signed-off-by: Daniel Henrique Barboza
---
src/lxc/lxc_container.c | 7 ++-
src/lxc/lxc_controller.c | 10 --
2 files changed, 6 insertions(+), 11 deletions(-)
diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index 42ed08ede6..b44cc68e67 100644
---
Remove unneeded labels of the following util files:
virhostcpu.c
virnetdevvportprofile.c
virnetlink.c
virpci.c
virsocketaddr.c
virstoragefile.c
Signed-off-by: Daniel Henrique Barboza
---
src/util/virhostcpu.c| 6 ++--
src/util/virnetdevvportprofile.c | 52
gather_scsi_host_cap() in node_device_hal.c can be greatly
simplified, given that the 'out' label is always getting
hit regardless of 'retval', which can also be eliminated.
Signed-off-by: Daniel Henrique Barboza
---
src/node_device/node_device_driver.c | 4 ++--
Signed-off-by: Daniel Henrique Barboza
---
src/conf/domain_conf.c | 192 ++---
1 file changed, 65 insertions(+), 127 deletions(-)
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index ee33b7caf0..c026fdf45c 100644
--- a/src/conf/domain_conf.c
+++
Remove unneeded labels from the following src/conf files:
capabilities.c
network_conf.c
networkcommon_conf.c
nwfilter_conf.c
virnetworkobj.c
Signed-off-by: Daniel Henrique Barboza
---
src/conf/capabilities.c | 14 ---
src/conf/network_conf.c | 45
Hi,
This is a follow up of a cleanup I did last year [1], which was
more focused on 'cleanup' labels. In this one I covered all
labels that are simply a 'return' proxy call.
This wasn't a 'purge all return labels' series. Some of them
are still around in cases where they help the code flow
(like
On 1/6/20 2:26 PM, Daniel P. Berrangé wrote:
Previous commits to eliminate gnulib modules accidentally
used some glib APIs not available in Debian 9.
GLib has support for compile time version checking of
APIs but we mistakenly havent enabled it in libvirt.
This series fixes the bad API
Just a small nit:
On 1/6/20 2:26 PM, Daniel P. Berrangé wrote:
GLib header files annotate every API with a version number.
It is possible to define some constants before including
glib.h which will result in useful compile time warnings.
Setting GLIB_VERSION_MIN_REQUIRED will result in a
GLib header files annotate every API with a version number.
It is possible to define some constants before including
glib.h which will result in useful compile time warnings.
Setting GLIB_VERSION_MIN_REQUIRED will result in a warning
if libvirt uses an API that was deprecated in the declared
g_canonicalize_filename was not introduced until glib 2.58
so we need a temporary backport of its impl.
Signed-off-by: Daniel P. Berrangé
---
src/libvirt_private.syms | 1 +
src/util/glibcompat.c| 106 +++
src/util/glibcompat.h| 3 ++
3 files
The g_date_time_new_from_iso8601() function was introduced as
a replacement for strptime in
commit 810613a60efe3924c536b3663246900bc08910a5
Author: Daniel P. Berrangé
Date: Mon Dec 23 15:37:26 2019 +
src: replace strptime()/timegm()/mktime() with GDateTime APIs set
g_fsync was introduced in 2.63 which is newer than our minimum
glib version. A future commit will introduce compile time
checking of API versions to prevent accidental usage of APIs
from glib newer than our min declared.
To avoid triggering this warning, however, we need to ensure
that we always
Signed-off-by: Daniel P. Berrangé
---
src/util/glibcompat.c | 30 +++---
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/src/util/glibcompat.c b/src/util/glibcompat.c
index e19cf74e72..42f9353c8f 100644
--- a/src/util/glibcompat.c
+++
Previous commits to eliminate gnulib modules accidentally
used some glib APIs not available in Debian 9.
GLib has support for compile time version checking of
APIs but we mistakenly havent enabled it in libvirt.
This series fixes the bad API usage, then enables
version checkihng, and finally
Debian 9 ships the oldest versions of some of our dependent
packages so can highlight bugs not seen elsewhere. CentOS 7,
despite being quite old, has rebased some packages to much
newer versions.
Signed-off-by: Daniel P. Berrangé
---
.travis.yml | 7 +++
1 file changed, 7 insertions(+)
Signed-off-by: Daniel P. Berrangé
---
src/util/glibcompat.c | 26 +-
src/util/glibcompat.h | 2 +-
2 files changed, 14 insertions(+), 14 deletions(-)
diff --git a/src/util/glibcompat.c b/src/util/glibcompat.c
index 9fba54cb79..e19cf74e72 100644
---
On 12/18/19 11:50 PM, Cole Robinson wrote:
On 12/17/19 12:25 PM, Michal Privoznik wrote:
While we discourage people to use the old style of specifying
UEFI for their domains (the old style is putting path to the FW
image under /domain/os/loader/ whilst the new one is using
On Mon, 2019-12-16 at 12:55 +0100, Fabiano Fidêncio wrote:
> OpenVZ has been added as part of commit 0a7993d3ed30ae. However, it's
> wrongly set to be installed on any supported CentOS.
>
> Signed-off-by: Fabiano Fidêncio
> ---
> guests/playbooks/update/tasks/base.yml | 1 +
> 1 file changed, 1
On Mon, 2019-12-16 at 12:55 +0100, Fabiano Fidêncio wrote:
> # Valid OS versions are:
> -# - CentOS7, Debian9, FedoraRawhide, OpenSUSE151, Ubuntu1804 and so on
> +# - CentOS7, CentOS8, Debian9, FedoraRawhide, OpenSUSE151, Ubuntu1804 and
> so
> +# on
This list is intended to show what
On Tue, 2019-12-17 at 11:21 -0500, Cole Robinson wrote:
> But the other ci/ scripts are listed in Makefile.am EXTRA_DIST, so
> adjust that before pushing unless it was deliberate
Nah, it was just an oversight. Good catch!
I've fixed it before pushing.
--
Andrea Bolognani / Red Hat /
On Mon, Jan 06, 2020 at 03:24:18PM +0100, Michal Privoznik wrote:
> *** BLURB HERE ***
>
> Michal Prívozník (2):
> vircgroupv2devices: Unexport virCgroupV2DevicesAttachProg()
> vircgroupv2devices: Avoid double close on map FD
Reviewed-by: Pavel Hrdina
signature.asc
Description: PGP
If we are certain that the checkpoint creation failed we remove the
metadata from the list. To allow reusing this in the backup code add a
new helper and export it.
Signed-off-by: Peter Krempa
---
src/qemu/qemu_checkpoint.c | 22 --
src/qemu/qemu_checkpoint.h | 4
2
When creating a checkpoint along with a backup, failure in some cases
lead to libvirt keeping the stale chekckpoint metadata.
Peter Krempa (2):
qemu: checkpoint: Extract and export rollback of checkpoint metadata
storing
qemu: backup: roll-back checkpoint metadata if the checkpoint wasn't
We insert the checkpoint metadata into the list of checkpoints prior to
actually creating the on-disk bits. If the 'transaction' or any other
steps done between inserting the checkpoint and creating the on-disk
data fail we'd end up with an unusable checkpoint that would vanish
after libvirtd
Split the switch by fsdriver type to allow adding a new one.
Signed-off-by: Ján Tomko
---
src/qemu/qemu_domain_address.c | 34 +++---
1 file changed, 23 insertions(+), 11 deletions(-)
diff --git a/src/qemu/qemu_domain_address.c b/src/qemu/qemu_domain_address.c
index
Wire up the allocation and disposal of private data.
Signed-off-by: Ján Tomko
---
src/qemu/qemu_domain.c | 38 ++
src/qemu/qemu_domain.h | 12
2 files changed, 50 insertions(+)
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index
Split the formatting by fsdriver type to allow adding a new type.
Signed-off-by: Ján Tomko
---
src/qemu/qemu_command.c | 17 +++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3b18282de4..90236620a1 100644
---
This will be needed in the future for allocating private data.
Signed-off-by: Ján Tomko
---
src/conf/domain_conf.c | 4 ++--
src/conf/domain_conf.h | 2 +-
src/lxc/lxc_native.c | 2 +-
src/lxc/lxc_process.c| 2 +-
src/openvz/openvz_conf.c | 2 +-
src/vmx/vmx.c| 2 +-
Remove the 'gluster' part and decouple the return from
the gluster_debug_level parsing to allow adding more options
to this section.
Signed-off-by: Ján Tomko
---
src/qemu/libvirtd_qemu.aug | 4 ++--
src/qemu/qemu_conf.c | 11 +++
2 files changed, 9 insertions(+), 6 deletions(-)
Ján Tomko (9):
build: error out when check-augeas fails
qemu: rename gluster_debug_entry
conf: add xmlopt to virDomainFSDefNew
conf: add private data to virDomainFSDef
qemu: add private data to virDomainFSDef
qemu: pass private data to qemuBuildFilesystemCommandLine
qemu: address:
Add an object to hold the private data and call the
allocation function if it's present in xmlopt.
Signed-off-by: Ján Tomko
---
src/conf/domain_conf.c | 7 ++-
src/conf/domain_conf.h | 2 ++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/conf/domain_conf.c
Fixes: 2ffbdabb859594256d45c1b48521dd6501629852
Signed-off-by: Ján Tomko
---
src/Makefile.am | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/Makefile.am b/src/Makefile.am
index f3d4c28c6d..c9b5eeba47 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -342,7 +342,7 @@
This will be used by a future patch.
Signed-off-by: Ján Tomko
---
src/qemu/qemu_command.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 11d3c29297..3b18282de4 100644
--- a/src/qemu/qemu_command.c
+++
Signed-off-by: Ján Tomko
---
docs/formatdomain.html.in | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index dd04a05f09..b7910e3742 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -3979,7 +3979,7
*** BLURB HERE ***
Michal Prívozník (2):
vircgroupv2devices: Unexport virCgroupV2DevicesAttachProg()
vircgroupv2devices: Avoid double close on map FD
src/libvirt_private.syms | 1 -
src/util/vircgroupv2devices.c | 29 +
src/util/vircgroupv2devices.h | 5
This function is not called outside of the source file where it's
defined. There's no need to export it.
Signed-off-by: Michal Privoznik
---
src/libvirt_private.syms | 1 -
src/util/vircgroupv2devices.c | 14 +-
src/util/vircgroupv2devices.h | 5 -
3 files changed, 1
When allowing/denying a device in devices CGroupV2 we have to
write a BPF program for it. The program we put there is merely
static and all it does it looks up a device in a hash table (also
known as map in BPF terminology). A map is referenced via an FD
which can be acquired via virBPFCreateMap()
On Thu, Jan 02, 2020 at 06:45:05PM +0800, Wang Huaqiang wrote:
> Introduce an option '--memory' for showing memory related
> information. The memory bandwidth infomatio is listed as:
>
> Domain: 'libvirt-vm'
> memory.bandwidth.monitor.count=4
> memory.bandwidth.monitor.0.name=vcpus_0-4
>
On Thu, Jan 02, 2020 at 06:45:04PM +0800, Wang Huaqiang wrote:
> The underlying resctrl monitoring is actually using 64 bit counters,
> not the 32bit one. Correct this by using 64bit data type for reading
> hardware value.
>
> To keep the interface consistent, the result of CPU last level cache
>
On Mon, Jan 06, 2020 at 12:36:57PM +0100, Peter Krempa wrote:
> Inactive VM doesn't have qemuCaps set thus we'd never properly report
> that VM backups are supported only for running VMs.
>
> Move the capability check after the active check.
>
> Signed-off-by: Peter Krempa
> ---
Reviewed-by: Erik
Inactive VM doesn't have qemuCaps set thus we'd never properly report
that VM backups are supported only for running VMs.
Move the capability check after the active check.
Signed-off-by: Peter Krempa
---
src/qemu/qemu_backup.c | 12 ++--
1 file changed, 6 insertions(+), 6 deletions(-)
Signed-off-by: Peter Krempa
---
src/util/virtime.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Trivial.
diff --git a/src/util/virtime.c b/src/util/virtime.c
index 54466b2f39..13f899cb91 100644
--- a/src/util/virtime.c
+++ b/src/util/virtime.c
@@ -223,7 +223,7 @@ int
On Wed, Jan 01, 2020 at 13:06:36 +0800, Han Han wrote:
> Signed-off-by: Han Han
> ---
> docs/formatdomain.html.in | 10 ++
> docs/formatdomaincaps.html.in | 1 +
> 2 files changed, 11 insertions(+)
This should be part of the XML addition commit.
>
> diff --git
On Mon, Jan 06, 2020 at 11:11:01 +0100, Peter Krempa wrote:
> On Wed, Jan 01, 2020 at 13:06:33 +0800, Han Han wrote:
> > Since v4.2-rc0, QEMU introduced a builtin rng backend that uses
> > getrandom() syscall to generate random. Add it to libvirt with the
> > backend model 'builtin'.
> >
> >
Libvirt cleans up pools that error out by deactivating them. When using
LVM this is not very useful. We rather would have our own system handle
any real failures and to many situations where errors are meaningless
and unimportant cause Libvirt to disable our pools continuously causing
lots of
I'm not entirely sure why Libvirt is checking to see if the target file
exists for LVM but it is a problem. Empty volume groups do not appear in
/dev. When libvirt starts these pools then fail to autostart because
their path does not exist. This is not useful, this is the patch we are
running
On Wed, Jan 01, 2020 at 13:06:34 +0800, Han Han wrote:
> Signed-off-by: Han Han
> ---
> docs/schemas/domaincommon.rng | 6 ++
> 1 file changed, 6 insertions(+)
This hunk should be part of the XML addition commit.
>
> diff --git a/docs/schemas/domaincommon.rng
On Wed, Jan 01, 2020 at 13:06:35 +0800, Han Han wrote:
> Signed-off-by: Han Han
> ---
> .../domaincapsdata/qemu_4.2.0-q35.x86_64.xml | 1 +
> .../domaincapsdata/qemu_4.2.0-tcg.x86_64.xml | 1 +
> .../qemu_4.2.0-virt.aarch64.xml | 1 +
>
On Wed, Jan 01, 2020 at 13:06:33 +0800, Han Han wrote:
> Since v4.2-rc0, QEMU introduced a builtin rng backend that uses
> getrandom() syscall to generate random. Add it to libvirt with the
> backend model 'builtin'.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1785091
>
> Signed-off-by: Han
On Wed, Jan 01, 2020 at 13:06:31 +0800, Han Han wrote:
> It is used to check if qemu is capable of rng-builtin object:
> -object rng-builtin,id=id
>
> This object is added since qemu-4.2.0-rc0, commit 6c4e9d48.
>
> Signed-off-by: Han Han
> ---
> src/qemu/qemu_capabilities.c | 4
>
On Wed, Jan 01, 2020 at 13:06:32 +0800, Han Han wrote:
> From: Han Han
>
> For qemu object like rng-builtin, there are no properties after id
> property. We should always set comma after object id. Otherwise it will
> cause trailing comma on object:
> -object rng-builtin,id=ID,
>
>
*libvirt_stream_event_add_callback* creates *passthrough* variable
using *rb_ary_new2* and pass it to *virStreamEventAddCallback* at
*ext/libvirt/stream.c:272*.
After that ruby garbage collector removes this variable (I think
because there is no references for *passthrough* in ruby code).
On Thursday, 2 January 2020 15:53:43 CET Daniel P. Berrangé wrote:
> A wrapper that calls g_fsync on Win32/macOS and fdatasync
> elsewhere. g_fsync is a stronger flush than we need but it
> satisfies the caller's requirements & matches the approach
> gnulib takes.
>
> [...]
> +int
>
On Thursday, 2 January 2020 15:53:52 CET Daniel P. Berrangé wrote:
> The canonicalize_file_name(path) is equivalent to calling
> realpath(path, NULL). Passing NULL for the second arg of
> realpath is not standardized behaviour, however, Linux,
> FreeBSD > 6.4 and macOS > 10.5 all support this
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