Bug#1010957: man-db: unreproducible index.db: contents depend on directory read order

[Johannes Schauer Marin Rodrigues]

Source: man-db
Version: 2.10.2-1
Severity: normal
User: reproducible-builds at lists.alioth.debian.org
Usertags: randomness
X-Debbugs-Cc: josch at debian.org, reproducible-bugs at lists.alioth.debian.org

Hi,

the contents of index.db are unreproducible across different
hosts/filesystems. With the same host/filesystem, it works fine:

    $ export SOURCE_DATE_EPOCH=1652473183
    $ mmdebstrap --variant=standard unstable out1.tar
    $ mmdebstrap --variant=standard unstable out2.tar
    $ cmp out1.tar out2.tar
    $ echo $?
    0

Now lets mmdebstrap use a filesystem mounted with disorderfs as its
TMPDIR to simulate the problem:

    $ mkdir emptydir disorder
    $ sudo disorderfs --multi-user=yes --shuffle-dirents=yes --reverse-dirents=no emptydir disorder
    $ export TMPDIR=$(pwd)/disorder
    $ mmdebstrap --variant=standard unstable out1.tar
    $ mmdebstrap --variant=standard unstable out2.tar
    $ diffoscope out1.tar out2.tar | grep ├──
    ├── file list
    ├── ./var/cache/man/cs/index.db
    ├── ./var/cache/man/da/index.db
    ├── ./var/cache/man/de/index.db
    ├── ./var/cache/man/es/index.db
    ├── ./var/cache/man/fr/index.db
    ...

I attached the contents of /var/cache/man/index.db so that you can see
that it is indeed the order that differs between individual runs.

Thanks!

cheers, josch
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