only file mode differs - how to update in source state

[j-lakeman]

[I] ~ ❯❯❯ chezmoi diff --recursive .config/transmission/

Δ .config/transmission/settings.json (mode 100644 ⟶   100664)
─────────────────────────────────────────────────────────────
[I] ~ ❯❯❯

How can I resolve this by altering source state? Target state will always go back to 644.

[twpayne]

This is likely due to your umask setting. If you don't want files to be group readable, set your umask to 022.

[j-lakeman]

Do you mean 0o22 as shown here: https://www.chezmoi.io/reference/configuration-file/umask/
Cause with umask = 022 in chezmoi.toml I get
chezmoi: invalid config: /home/xxx/.config/chezmoi/chezmoi.toml: toml: expected newline but got U+0032 '2'

[twpayne]

You need to write valid TOML in your config file. Octal numbers need the 0o prefix, i.e. you need to write umask = 0o022. However, I would recommend reading up on umask on UNIX systems to understand the effect of the change you are making.