File Tree Fuzzer creates a pseudo-random directory hierarchy filled with some number of files.
Binaries for a number of platforms are available on the release page.
console,ignore
$ cargo +nightly install ftzz
To install cargo, follow these instructions.
Generate a reproducibly random tree in the current directory with approximately 1 million files:
```console $ ftzz g simple -n 1M About 1,000,000 files will be generated in approximately 1,000 directories distributed across a tree of maximum depth 5 where each directory contains approximately 4 other directories. Created 1,216,988 files across 1,209 directories.
```
Generate exactly 1 million files:
```console $ ftzz g exact -en 1M Exactly 1,000,000 files will be generated in approximately 1,000 directories distributed across a tree of maximum depth 5 where each directory contains approximately 4 other directories. Created 1,000,000 files across 1,011 directories.
```
Generate ~10_000 files with ~1 MB of random data spread across them:
```console $ ftzz g with_data -n 10K -b 1M About 10,000 files will be generated in approximately 1,000 directories distributed across a tree of maximum depth 5 where each directory contains approximately 4 other directories. Each file will contain approximately 100 bytes of random data. Created 13,934 files (1.4 MB) across 1,395 directories.
```
Because FTZZ creates reproducible outputs, the generated directory will always have the same structure given the same inputs. To generate variations on a structure with the same parameters, change the starting seed:
```console $ ftzz g unseeded -n 100 About 100 files will be generated in approximately 100 directories distributed across a tree of maximum depth 5 where each directory contains approximately 3 other directories. Created 108 files across 108 directories.
$ ftzz g seeded -n 100 --seed 42 # Or $RANDOM About 100 files will be generated in approximately 100 directories distributed across a tree of maximum depth 5 where each directory contains approximately 3 other directories. Created 246 files across 244 directories.
```
Other parameters can be found in the built-in docs:
```console $ ftzz help generate Generate a random directory hierarchy with some number of files
A pseudo-random directory hierarchy will be generated (seeded by this command's input parameters) containing approximately the target number of files. The exact configuration of files and directories in the hierarchy is probabilistically determined to mostly match the specified parameters.
Generated files and directories are named using monotonically increasing numbers, where files are
named n and directories are named n.dir for a given natural number n.
By default, generated files are empty, but random data can be used as the file contents with the
total-bytes option.
Usage: ftzz[EXE] generate [OPTIONS] --files
Arguments:
The directory will be created if it does not exist.
Options:
-n, --files
Note: this value is probabilistically respected, meaning any number of files may be
generated so long as we attempt to get close to N.
--files-exact
Whether or not to generate exactly N files
-b, --total-bytes
Note: this value is probabilistically respected, meaning any amount of data may be
generated so long as we attempt to get close to N.
[default: 0]
--fill-byte <FILL_BYTE>
Specify a specific fill byte to be used instead of deterministically random data
This can be used to improve compression ratios of the generated files.
--bytes-exact
Whether or not to generate exactly N bytes
-e, --exact Whether or not to generate exactly N files and bytes
-d, --max-depth
[default: 5]
-r, --ftd-ratio
Note: this value is probabilistically respected, meaning not all directories will have N
files).
--seed <SEED>
Change the PRNG's starting seed
For example, you can use bash's `$RANDOM` function.
[default: 0]
-h, --help
Print help (use -h for a summary)
-q, --quiet... Less output per occurrence
-v, --verbose... More output per occurrence
```