Document that a transaction progress is printed to an error output instead of to a standard output #2116
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This can be reproduced locally like so: |
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This is caused by this change: #1641 |
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Neal, bare-bone reproducer please. I'm not going learn what Kiwi is, how to run it and investigate how Kiwi executed DNF. |
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But yes, DNF5 prints transaction summary to stdout and transaction progress, as all progressbars, to stderr. According to that pull request it's a feature. I recommend you fixing Kiwi to capture stderr too. Otherwise, you will miss error messages. |
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I will ask other teammates, but I'm keen rejecting this request as transaction progress is a "verbose debugging" output. |
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It's straight up a regression from DNF4 that this output was moved to stderr.
Bare-bones reproducer is to just run dnf through subprocess without redirecting stderr into stdout. Please also endeavor to be courteous. I filed this issue while discussing it during the DNF community meeting. I provided the information that was asked. And you will have to know about kiwi anyway, since we use it for almost half of Fedora images now. |
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We've decided to keep the status quo of which messages are printed on stdout vs stderr. I don't consider these changes a regression from DNF 4 since they did resolve #1361, and things like Kiwi should be logging stderr (and possibly capturing dnf5.log) anyway. But I realize the changes from #1641 are not documented on https://dnf5.readthedocs.io/en/latest/changes_from_dnf4.7.html, so we should update it. |
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I noticed that DNF isn't printing out all the install step output when it is run inside of kiwi (essentially python subprocess piped to a python logger). It looks something like this:
Full log is available here: https://kojipkgs.fedoraproject.org//packages/Fedora-KDE-Desktop-Live/42_Beta/1.2/data/logs/image/x86_64/image-root.x86_64.log
I expect the output to look more like what it does in mock root.log where it shows the downloading and installing progress steps, like in this file: https://kojipkgs.fedoraproject.org//packages/Fedora-KDE-Desktop-Live/42_Beta/1.2/data/logs/image/x86_64/root.log
(This was discussed in the community meeting and filed as an issue accordingly.)
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