Re: Q: extract database name from directory dump

[Melvin Davidson <melvin6925@xxxxxxxxx>]

BTW, other than the obvious of including the name in path or file, if you are referring to previous/existing dumps than one of two options apply.

grep -i some_dump_file 'CREATE DATABASE'

If it's found, then you know it's from at least one known database.

If nothing is found, then the dump can be applied to ANY database.

On Sat, Mar 12, 2016 at 4:12 PM, John R Pierce <pierce@xxxxxxxxxxxx> wrote:

On 3/12/2016 12:33 PM, Karsten Hilbert wrote:

How can I (programmatically) find out which database a dump
was taken from given the dump file ?

Constraints of the question:

- existing dump in directory format
- dump was taken of only one particular database

I know of no documentation on the format of the toc.dat file contained in that directory format pg_dump output (short of reading the source to pg_dump/restore?) but I tried a hexdump...

$ hexdump -C junky/toc.dat
00000000  50 47 44 4d 50 01 0c 00  04 08 03 01 01 00 00 00 |PGDMP...........|
00000010  00 24 00 00 00 00 2d 00  00 00 00 0c 00 00 00 00 |.$....-.........|
00000020  0c 00 00 00 00 02 00 00  00 00 74 00 00 00 00 00 |..........t.....|
00000030  00 00 00 00 04 00 00 00  6a 75 6e 6b 00 06 00 00 |........junk....|
00000040  00 39 2e 33 2e 31 31 00  06 00 00 00 39 2e 33 2e |.9.3.11.....9.3.|
(tons more deleted)

and note that 'junk' is in fact the name of the database.   But I doubt the format of this toc.dat file is guaranteed to be immutable



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john r pierce, recycling bits in santa cruz

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Melvin Davidson
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