It's possible to add user-defined fields in the debian/control file using
the `XBS-` method, as defined in the Policy Manual[1].
Something like this before calling dpkg-buildpackage will work to inject a
new field into both the Source and Binary packages. But some packages don't
contain debian/control as they generate it (kernel etc) so this is not
always reliable.
```
sed -i "0,/^\s*$/s//XBS-Git-Branch: ${CI_COMMIT_BRANCH}\n/" debian/control
dpkg-buildpackage
```
It's possible to inject the user-defined field into the generated source
package using options passed to dpkg-source[2]:
```
dpkg-buildpackage --source-option=-DGit-Branch=${CI_COMMIT_BRANCH}
```
However, that will only inject the field into the generated source package,
not the generated binary packages. Is there a method to reliably inject
fields into the binary packages?
Thanks,
Nick
[1]:
https://www.debian.org/doc/debian-policy/ch-controlfields.html#user-defined-fields
[2]:
https://manpages.debian.org/buster/dpkg-dev/dpkg-buildpackage.1.en.html
