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udevadm: automatically anable JSON-SEQ in case JSON is used for "udevadm info -a"

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We are going to output a series of JSON objects, hence let's
automatically enable JSON-SEQ output mode, as we usually do.

"jq --seq" supports this natively, hence this should not really restrict
us.

Follow-up for: 67ea8a4c0e
This commit is contained in:
Lennart Poettering 2024-10-28 13:26:01 +01:00 committed by Yu Watanabe
parent 7aea1c9e80
commit ebc64de22f
3 changed files with 9 additions and 2 deletions
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5
man/udevadm.xml
View File

@ -167,6 +167,11 @@
<para>Print all sysfs properties of the specified device that can be used
in udev rules to match the specified device. It prints all devices
along the chain, up to the root of sysfs that can be used in udev rules.</para>
<para>This switch supports JSON output mode (see <option>--json=</option> below). Note that
because this switch generates multiple JSON objects, JSON-SEQ mode is automatically enabled
(RFC7464). (Note: tools such as <ulink url="https://jqlang.github.io/jq/manual/">jq</ulink>
natively support JSON-SEQ via the <option>--seq</option> switch.)</para>
</listitem>
</varlistentry>
<varlistentry>

2
src/udev/udevadm-info.c
View File

@ -274,6 +274,8 @@ static int print_device_chain_in_json(sd_device *device) {
assert(device);
arg_json_format_flags |=SD_JSON_FORMAT_SEQ;
r = print_all_attributes_in_json(device, /* is_parent = */ false);
if (r < 0)
return r;

4
test/units/TEST-17-UDEV.10.sh
View File

@ -71,8 +71,8 @@ udevadm info --query symlink --root /sys/class/net/$netdev
(! udevadm info -q hello -r /sys/class/net/$netdev)
udevadm info -a /sys/class/net/$netdev
udevadm info -a --json=off /sys/class/net/$netdev
udevadm info -a --json=pretty /sys/class/net/$netdev | jq . >/dev/null
udevadm info -a --json=short /sys/class/net/$netdev | jq . >/dev/null
udevadm info -a --json=pretty /sys/class/net/$netdev | jq --seq . >/dev/null
udevadm info -a --json=short /sys/class/net/$netdev | jq --seq . >/dev/null
udevadm info -t >/dev/null
udevadm info --tree /sys/class/net/$netdev
udevadm info -x /sys/class/net/$netdev