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systemd/SOURCES/0408-bootctl-make-json-outp...

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From 27e95f2513e24a6abc26c56f05c67c34492442d7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Tue, 15 Nov 2022 15:00:57 +0100
Subject: [PATCH] bootctl: make --json output normal json
We would output a sequence of concatenated JSON strings. 'jq' accepts such
output without fuss, and can even automatically build an array with --slurp/-s.
Nevertheless, parsing this format is more effort for the reader, since it's not
"standard JSON". E.g. Python's json module cannot do this out-of-the-box, but
needs some loop with json.JSONDecoder.raw_decode() and then collecting the
objects into an array. Such streaming output make sense in case of logs, where
we stream the output and it has no predefined length. But here we expect at
most a few dozen entries, so it's nicer to write normal JSON that is trivial to
parse.
I'm treating this is a bugfix and not attempting to provide compatibility
backwards. I don't think the previous format was seeing much use, and it's
trivial to adapt to the new one.
(cherry picked from commit b570204a97bccfbfce8fc4ffa65306f8a06fe16e)
Related: RHEL-13199
---
src/shared/bootspec.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/src/shared/bootspec.c b/src/shared/bootspec.c
index d3cfb41a12..fe44b5e9d2 100644
--- a/src/shared/bootspec.c
+++ b/src/shared/bootspec.c
@@ -1408,6 +1408,8 @@ int show_boot_entries(const BootConfig *config, JsonFormatFlags json_format) {
assert(config);
if (!FLAGS_SET(json_format, JSON_FORMAT_OFF)) {
+ _cleanup_(json_variant_unrefp) JsonVariant *array = NULL;
+
for (size_t i = 0; i < config->n_entries; i++) {
_cleanup_free_ char *opts = NULL;
const BootEntry *e = config->entries + i;
@@ -1447,9 +1449,13 @@ int show_boot_entries(const BootConfig *config, JsonFormatFlags json_format) {
if (r < 0)
return log_oom();
- json_variant_dump(v, json_format, stdout, NULL);
+ r = json_variant_append_array(&array, v);
+ if (r < 0)
+ return log_oom();
}
+ json_variant_dump(array, json_format, NULL, NULL);
+
} else {
for (size_t n = 0; n < config->n_entries; n++) {
r = show_boot_entry(