How to convert between UUID and file path?

pedros · 09-07-2017, 12:08 PM

I use debian 9.1.0, which has makehuman 1.1.0. makehuman saves a file as *.mhm, which says "2c12f43b-1303-432c-b7ce-d78346baf2e6". This looks like a UUID that points to another file. Debian also has /etc/fstab, which contains UUID code. How can I find out the path of the file the UUID points to? Or if I know the path of a file I want to use, how can I convert it to UUID?

ondoho · 09-07-2017, 01:08 PM

is that the complete content of the file? what's the complete name of the file? what does makehuman documentation say about it?

fwiw, you can try

Code:

sudo blkid

and comapre.

but i suspect that uuids can be used in a more versatile manner than you think.
in other words, it could be anything.

Quote:

Originally Posted by man uuid

The UUID library is used to generate unique identifiers for objects that may be accessible beyond the local system.

IsaacKuo · 09-07-2017, 02:31 PM

A UUID is essentially just a random number with so many possibilities that it is practically guaranteed to be unique. The file name created by makehuman has nothing at all to do with any UUIDs that appear in /etc/fstab. The probability of any such UUID even matching any UUID used in any /etc/fstab anywhere in the world is vanishingly small.

The point, I expect, is to guarantee that the file name generated will not be the same as any other created anywhere else. The developers perhaps expect usage where the generated files will be shared around and mixed together in the same storage directories somewhere. Giving each model a universally unique file name might be useful for managing them in various ways or something.

pedros · 09-07-2017, 05:50 PM

makehuman/v1/models/Save.mhm

Quote:

# Written by MakeHuman 1.1.0
version v1.1.0
tags Save
camera 0.0 0.0 0.0 0.0 0.0 1.0
modifier macrodetails-universal/Muscle 0.500000
modifier macrodetails/African 0.333333
modifier macrodetails-proportions/BodyProportions 0.500000
modifier macrodetails/Gender 0.500000
modifier macrodetails-height/Height 0.500000
modifier breast/BreastSize 0.500000
modifier macrodetails/Age 0.500000
modifier breast/BreastFirmness 0.500000
modifier macrodetails/Asian 0.333333
modifier macrodetails/Caucasian 0.333333
modifier macrodetails-universal/Weight 0.500000
eyes HighPolyEyes 2c12f43b-1303-432c-b7ce-d78346baf2e6
clothesHideFaces True
skinMaterial skins/default.mhmat
material HighPolyEyes 2c12f43b-1303-432c-b7ce-d78346baf2e6 eyes/materials/brown.mhmat
subdivide False

In the complete file above, it seems the UUID points to a file on the local system.
Debian blkid points to devices that can be mounted.
I now understand that diffrent applications use UUID in diffrent ways.
So my question should specify the application. Thank you for explaining that.
I could not find makehuman documentation that says anything about UUID.
I remember finding some debian documentation, but it was confusing.
My intention is to manually edit Save.mhm.

HappyTux · 09-09-2017, 09:29 PM

Quote:

Originally Posted by pedros

makehuman/v1/models/Save.mhm
In the complete file above, it seems the UUID points to a file on the local system.
Debian blkid points to devices that can be mounted.
I now understand that diffrent applications use UUID in diffrent ways.
So my question should specify the application. Thank you for explaining that.
I could not find makehuman documentation that says anything about UUID.
I remember finding some debian documentation, but it was confusing.
My intention is to manually edit Save.mhm.

locate Save.mhm should get you the path to the file to open for editing.

frankbell · 09-09-2017, 09:39 PM

This is the tutorial that taught me how to use UUIDs in /etc/fstab: https://www.cyberciti.biz/faq/linux-...-update-fstab/