Proper way to split a large directory into partitions respecting dirname and filename, and then create burnable iso for Blu-ray preserving the directory tree.

[amalgame21]

I want to backup /mnt/drive/photos which have a very large directory tree like this:

......
/mnt/drive/photos/2015-02-15-Meeting-With-Friends/
/mnt/drive/photos/2015-02-15-Meeting-With-Friends/videos/
/mnt/drive/photos/2015-02-18-Family-Trip/
.......
/mnt/drive/photos/2020-04-26-Tim-Birthday/
/mnt/drive/photos/2020-06-10-Anthony-Birthday/
/mnt/drive/photos/2020-06-10-Anthony-Birthday/videos/
/mnt/drive/photos/2020-06-10-Anthony-Birthday/memo/
......

I would like to do 2 things:

1. Split the directory with fpart into multiple partitions, each of which contains less than 25GB of data (for 25GB Blu-ray disc), and the splitting should respect the dirname and filename in alphebatical order.
2. Create burnable Blu-ray ISOs using the partitions generated from the fpart.

After some trial and error, for 1), I think it can be achieved by find /mnt/drive/photos -type f | sort | fpart -L -s 23500m -i - -o photos.
It generated multiple files with filename photos.1 photos.2 ... photos.n, I believed they are called partitions.
The partitions content seems to be sorted with alphabetical order.

Because some of the partitions exceed 25GB with the -L -s 25g, so I use -L -s 23500m instead.

After that, it is also challenging to make a burnable ISO.
I guess the proper tool for this should be mkisofs or xorrisofs, because the -path-list flag of both tools seems to be designed to read the output generated by fpart.

What I want in the ISO is like this:

......
/2015-02-15-Meeting-With-Friends/
/2015-02-15-Meeting-With-Friends/videos/
/2015-02-18-Family-Trip/
.......
/2020-04-26-Tim-Birthday/
/2020-06-10-Anthony-Birthday/
/2020-06-10-Anthony-Birthday/videos/
/2020-06-10-Anthony-Birthday/memo/
......

I tested it with the command mkisofs -o image1.iso -J -r -graft-points -path-list photos.1
However, it seems that the -graft-points is not respected by -path-list, all the files in the partition photos.1 are put to the root directory of ISO. It generated an error because some of them having the same filename.

mkisofs -o image1.iso -J -r -graft-points /=/mnt/drive/photos -path-list photos.1, also did not work. It did 2 things: 1) put ALL the directories inside /mnt/drive/photos into the root of ISO. 2) put all the files in the partition photos.1 into the root of ISO.

I am pretty much stuck here after testing it for a whole day.
Am i using fpart or mkisofs improperly so they are not working together?

Please help!

[amalgame21]

Problem solved by manually editing the partition content into -graft-points format.
e.g. Change the content of the partition photos.1 generated by fpart from

/mnt/drive/photos/2015-02-15-Meeting-With-Friends/img1.jpg
/mnt/drive/photos/2015-02-15-Meeting-With-Friends/img2.jpg
/mnt/drive/photos/2015-02-15-Meeting-With-Friends/img3.jpg

to

/2015-02-15-Meeting-With-Friends/img1.jpg=/mnt/drive/photos/2015-02-15-Meeting-With-Friends/img1.jpg
/2015-02-15-Meeting-With-Friends/img2.jpg=/mnt/drive/photos/2015-02-15-Meeting-With-Friends/img2.jpg
/2015-02-15-Meeting-With-Friends/img3.jpg=/mnt/drive/photos/2015-02-15-Meeting-With-Friends/img3.jpg

Then run mkisofs -o image1.iso -J -r -graft-points -path-list photos.1

Thank you very much for creating this tool!

[martymac]

Perfect, thanks for your feedback :)