Improve nsexec logging #2836
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Improve nsexec logging #2836
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This was referenced Mar 8, 2021
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This still draft? |
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No longer a draft; @cyphar PTAL (this is mostly your code) |
In order to make 'runc --debug' actually useful for debugging nsexec bugs, provide information about all the internal operations when in debug mode. [@kolyshkin: rebasing; fix formatting via indent for make validate to pass] Signed-off-by: Aleksa Sarai <[email protected]> Signed-off-by: Kir Kolyshkin <[email protected]>
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Rebased again; PTAL @cyphar |
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centos7 fails This is the second time I see it, not sure what's happening but definitely unrelated to this PR. CI restarted. |
cyphar
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Apr 9, 2021
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CentOS CI failure is a flake (#2760), restarting. |
mrunalp
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Apr 12, 2021
Since the previous commit, some strings logged by write_log() contain a
literal newline, which leads to errors like this one:
> # time="2020-06-07T15:41:37Z" level=error msg="failed to decode \"{\\\"level\\\":\\\"debug\\\", \\\"msg\\\": \\\"nsexec-0[2265]: update /proc/2266/uid_map to '0 1000 1\\n\" to json: invalid character '\\n' in string literal"
The fix is to escape such characters.
Add a simple (as much as it can be) routine which implements JSON string
escaping as required by RFC4627, section 2.5, plus escaping of DEL (0x7f)
character (not required, but allowed by the standard, and usually done
by tools such as jq).
As much as I hate to code something like this, I was not able to find
a ready to consume and decent C implementation (not using glib).
Added a test case (and some additional asserts in C code, conditionally
enabled by the test case) to make sure the implementation is correct.
The test case have to live in a separate directory so we can use
different C flags to compile the test, and use C from go test.
[v2: try to simplify the code, add more tests]
[v3: don't do exit(1), try returning an error instead]
Signed-off-by: Kir Kolyshkin <[email protected]>
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mrunalp
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Apr 12, 2021
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@cyphar PTAL; the only change after your review was this: #2836 (comment) |
cyphar
approved these changes
Apr 13, 2021
| free(s); | ||
| // As malloc failed, strdup can fail, too, so in the worst case | ||
| // scenario NULL will be returned from here. | ||
| return strdup("escape_json_string: out of memory"); |
There was a problem hiding this comment.
I feel like it makes more sense to always return NULL (and then in the caller provide the fallback error message), but it doesn't really matter imho.
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Draft as it's blocked by #2835In order to make
runc --debugactually useful for debugging nsexecbugs, provide information about all the internal operations when in
debug mode.
Before:
After:
This is a carry of #2460 with a few fixes on top:
make cfmt;Closes: #2460
(this was originally developed in #2487)