Alex Auvolat
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ddc3fba9fb
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doc: fix "Nix Archive (NAR) format" specification
For executable files in NAR archives, the `executable` tag is followed
by an empty string, which was not indicated correctly in the
specification.
Adding the empty string can be seen in `src/libutil/archive.cc:62`.
Here is an example of a hexdump of a NAR archives where this empty
string can be seen:
```
00000730 65 6e 74 72 79 00 00 00 01 00 00 00 00 00 00 00 |entry...........|
00000740 28 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00 |(...............|
00000750 6e 61 6d 65 00 00 00 00 10 00 00 00 00 00 00 00 |name............|
00000760 6c 69 62 6d 70 66 72 2e 73 6f 2e 36 2e 32 2e 31 |libmpfr.so.6.2.1|
00000770 04 00 00 00 00 00 00 00 6e 6f 64 65 00 00 00 00 |........node....|
00000780 01 00 00 00 00 00 00 00 28 00 00 00 00 00 00 00 |........(.......|
00000790 04 00 00 00 00 00 00 00 74 79 70 65 00 00 00 00 |........type....|
000007a0 07 00 00 00 00 00 00 00 72 65 67 75 6c 61 72 00 |........regular.|
000007b0 0a 00 00 00 00 00 00 00 65 78 65 63 75 74 61 62 |........executab|
000007c0 6c 65 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |le..............|
000007d0 08 00 00 00 00 00 00 00 63 6f 6e 74 65 6e 74 73 |........contents|
000007e0 a0 16 0c 00 00 00 00 00 7f 45 4c 46 02 01 01 00 |.........ELF....|
000007f0 00 00 00 00 00 00 00 00 03 00 3e 00 01 00 00 00 |..........>.....|
00000800 00 00 00 00 00 00 00 00 40 00 00 00 00 00 00 00 |........@.......|
00000810 e0 0e 0c 00 00 00 00 00 00 00 00 00 40 00 38 00 |............@.8.|
00000820 0b 00 40 00 1f 00 1e 00 01 00 00 00 04 00 00 00 |..@.............|
00000830 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
```
(taken from `09zrxnn4j5hjxqj93xvxrl1dpmq4cyajas3yf7a7y0i7h81m6bd4.nar`,
available on `cache.nixos.org`)
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2025-11-12 20:16:00 +01:00 |
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