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<think>
Alright, let's try to figure out which category this bug report falls into. The issue is about TMPDIR not being usable for snapshot-blockdevs when running QEMU as a non-root user.
First, I'll look at the description provided. The problem arises because when started as root, everything works fine, but as a non-root user, `getenv(TMPDIR)` returns NULL. This happens because glibc treats TMPDIR as an UNSECURE_ENVVAR, which probably means it's not accessible by non-root users for security reasons.
The bug report mentions that the function `get_tmp_filename()` in `block.c` is affected. The problem here seems related to how QEMU handles temporary directories when run without root privileges. Since TMPDIR isn't available, QEMU can't create the necessary files, causing issues with snapshot-blockdevs.
Now, looking at the possible categories: we have options like 'mistranslation', 'assembly', 'other', and several others including 'permissions'. The issue here is about environment variables and file permissions, specifically when dealing with non-root users. It's not a translation error or an assembly problem.
The core issue is that QEMU can't access the TMPDIR as a non-root user, which relates to how files are being handled and permissions. This seems more like a permissions-related problem rather than something else. The user suggests adding new options to specify a different tmp directory, but the root cause is about handling environment variables securely.
So, considering all this, the category that best fits this bug report is 'permissions' because it's related to how non-root users access certain resources and environment variables.
</think>
permissions
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