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graphic: 0.897
device: 0.790
semantic: 0.755
vnc: 0.645
PID: 0.624
files: 0.420
boot: 0.365
socket: 0.364
performance: 0.353
network: 0.324
other: 0.314
permissions: 0.303
debug: 0.302
KVM: 0.251
TMPDIR is not usable for snapshot-blockdevs, if not root
Description of problem:
for using static disk-content we're using `snapshot`-flag for certain disks and set `TMPDIR` to a VM-specific path.
when started as root, all is ok.
when started as non-root, `getenv(TMPDIR)` in function `get_tmp_filename()` in file `block.c` return `NULL`, because glibc handles `TMPDIR` as `UNSECURE_ENVVAR` (glibc-src: `sysdeps/generic/unsecvars.h`)
well, we could compile qemu by ourself, but then we might miss important updates, so maybe this can be solved in main-source?
possible solutions:
- additionally look at another var like `QEMU_TMPDIR`, if `getenv("TMPDIR")` results in `NULL`
- add a global option to qemu like `--tmpdir=...`
- add a device-specific option like `snapshotdir=...`
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