admin/operations: fix and improve requeueing #29
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Using a filename which cannot be interpreted as integer value in decimal notation without any leading zeros does not work[1]. The **only** id which can be used save seems to be `0`, other values can be overwritten due to [2] and the implementation of `message_enqueue_retrieve_max_ID`[3] which is **not** free of race conditions. So better be save than sorry. [1] grommunio/gromox#135 [2] grommunio/gromox#136 [3] https://github.com/grommunio/gromox/blob/17ca866e731a3c19a6e66491442dd68a72b0ad39/mda/message_enqueue.cpp#L328 The code has been improved: - always use `mv -n` to **never** replace existing files - do not croak if `save/` is empty
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Using a filename which cannot be interpreted as integer value in decimal notation without any leading zeros does not work[1]. The only id which can be used save seems to be
0, other values can be overwritten due to [2] and the implementation ofmessage_enqueue_retrieve_max_ID[3] which is not free of race conditions. So better be save than sorry.[1] grommunio/gromox#135
[2] grommunio/gromox#136
[3] https://github.com/grommunio/gromox/blob/17ca866e731a3c19a6e66491442dd68a72b0ad39/mda/message_enqueue.cpp#L328
The code has been improved:
mv -nto never replace existing filessave/is empty