Are files always extracted even if not modified in target ?

[agambier]

I don't know if there is a forum for this kind of question.

On an embedded device.I use the command below to update the secondary partition of the rootfs.

casync extract --verbose --seed=/ --store=http://10.0.10.151:8080/rootfs.castr http://10.0.10.151:8080/rootfs.caidx /var/tmp/rootfs-b

According to the information outputted by casync I can see that after seeding the files, casync extract them.

...
Extracting usr/share/terminfo/s/screen
Extracted usr/share/terminfo/s/screen
Extracting usr/share/terminfo/s/screen-256color
Extracted usr/share/terminfo/s/screen-256color
Extracted usr/share/terminfo/s
Extracting usr/share/terminfo/v
Extracting usr/share/terminfo/v/vt100
Extracted usr/share/terminfo/v/vt100
Extracting usr/share/terminfo/v/vt100-putty
Extracted usr/share/terminfo/v/vt100-putty
Extracting usr/share/terminfo/v/vt102
Extracted usr/share/terminfo/v/vt102
Extracting usr/share/terminfo/v/vt200
...

Are the files really extracted even if they have not been modified on the rootfs ?
Is it just a confusing debug message ?