[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3818: Writing at offset=0 using REST API fails for empty files

[Tahoe-LAFS]

#3818: Writing at offset=0 using REST API fails for empty files
--------------------------+-----------------------
     Reporter:  derkades  |      Owner:
         Type:  defect    |     Status:  new
     Priority:  normal    |  Milestone:  undecided
    Component:  unknown   |    Version:  n/a
   Resolution:            |   Keywords:
Launchpad Bug:            |
--------------------------+-----------------------
Description changed by derkades:

Old description:

> Trying to write a single byte at offset 0 to an empty SDMF file:
> {{{
> FILE_CAP=$(curl -X PUT 'http://10.0.1.1:26551/uri?format=sdmf')
> curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP?offset=0" >
> error1.html
> }}}
> or MDMF:
> {{{
> FILE_CAP=$(curl -X PUT 'http://10.0.1.1:26551/uri?format=mdmf')
> curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP?offset=0" >
> error2.html
> }}}
> Please find error files attached.
>
> No offset works:
> {{{
> curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP"
> }}}
> Now that the file contains 1 byte ('a'), we can write at offset=1 to make
> it 2 bytes long ('aa'):
> {{{
> curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP?offset=1"
> }}}
> Also overwriting the first byte seems to work, but actually overwrites
> the entire file (unrelated issue?):
> {{{
> curl -X PUT --data b "http://10.0.1.1:26551/uri/$FILE_CAP?offset=1"
> }}}
> The file now contains 'b', while I would expect 'ba'.

New description:

 Trying to write a single byte at offset 0 to an empty SDMF file:
 {{{
 FILE_CAP=$(curl -X PUT 'http://10.0.1.1:26551/uri?format=sdmf')
 curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP?offset=0" >
 error1.html
 }}}
 or MDMF:
 {{{
 FILE_CAP=$(curl -X PUT 'http://10.0.1.1:26551/uri?format=mdmf')
 curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP?offset=0" >
 error2.html
 }}}
 Please find error files attached.

 No offset works:
 {{{
 curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP"
 }}}
 Now that the file contains 1 byte ('a'), we can write at offset=1 to make
 it 2 bytes long ('aa'):
 {{{
 curl -X PUT --data a "http://10.0.1.1:26551/uri/$FILE_CAP?offset=1"
 }}}
 Also overwriting the first byte seems to work, but actually overwrites the
 entire file (unrelated issue?):
 {{{
 curl -X PUT --data b "http://10.0.1.1:26551/uri/$FILE_CAP?offset=0"
 }}}
 The file now contains 'b', while I would expect 'ba'.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3818#comment:1>
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