I don't think a government servant is barred from writing a book unless you are in defense or strategic services and it relates to a country's inner official secrets or security.

Writing a book is exercising your right to freedom of expression.

There is no issue in publishing of book if you are government servant as it's not full time employment however in case book is against the department or its is specifically prohibited in your state rules you may be penalised by department.

 - As per law & government rule, a government employee cannot enter into dual employment, i.e. cannot do financial, gain from another source, unless he is authorised in writing by the concerned department. 

- Hence , for publishing a book permission is not needed from the concerned department or authority . 

- But, if you will gain from this sources , then legally you have to take permission from the concerned departmental head. 

- However some state in India has imposed restrictions over the same , but the Supreme Court vide its judgement in KAMESHWAR PRASAD VS. STATE OF BIHAR has held that the Constitution of India does not exclude Government servants as class from the protection of civil rights guaranteed by Part III., and a government employee has his right to publish work of art even without permission.

Whats next nothing......Enjoy your book....adopt some good marketing ideas. 

If your sovereign country law provide dual profession then its no harm to published  book or e-book, paper book.

Kindly provide your all details regarding citizen ship, birth place and country where it has be published.

Sanction of the Government is not necessary for publication of books/articles
of literary, artistic or scientific character: - Sanction of the Government is not
necessary for publication of a book or article by a member of the service if the ‘work’ is
of literary, artistic or scientific character and is not aided by his official duties but the
officer should take care that in publishing the book he does not contravene provisions of
rule 6 or any other provisions of the All India Services (Conduct) Rules, 1968.

But prior sanction of the Government is necessary under rule 13(4) for accepting
remuneration for publication of books/articles of purely literary, artistic or
scientific character, though permission is not required for their publication under
rule 6 the All India Services (Conduct) Rules, 1968.

Due diligence need to be done of the agreement which you had signed with the government while joining the services to advise you better.

Well, being a government servant one must take prior permission to publish a book.

Its not mandatory if the book is generating any revenue in your favour. 

In any event do inform the authorities about the virtual publication. 

1. Publishing of a book/e-book requires prior permission from the Competent Authority and if you have not obtained necessary permission, then you will be liable to be punished as per the Rule Book applicable to your designation in the department.

2.  Publishing, without permission, attracts disciplinary proceedings and the act is considered as indiscipline, more so being a COP.

Yes, no prohibition.

All government employees need prior permission of their respective department heads/Chairman/Secretary before publishing a book or even an article.

The permission is generally granted if it's not political, will not put bad light on department, or is against provisions of Official Secrets Act or against Public policy.

2) disciplinary action can be taken against you 

You need to elaborate what permission and what provision flouted ro provide detailed advice

Dear Sir/Madam,

It is suggested that  from your query is not clear that what advice is being sought by you. You are suggested to clarify the same, so that actual advice can be rendered. 

Better to take  take permission from  Government through concerned departmental head for avoiding future disciplinary action if any taken by the Government.

Dear sir,

Please elaborate your question. What next for what purpose(s)?

Until and unless there is an objection to this or if the contents are discriminatory,  you may not have to worry. 

If you receive a legal notice demanding explanation,  you may take the assistance of a local advocate and issue a proper reply notice. 

Get it copyrighted.

You need to check your employment contract whether there is any restrictions against the employee from publishing a book

I doubt there would be any

All government employees need prior permission of their respective department heads/Chairman /Secretary before publishing a book or even an article.The permission is generally granted if it's not political, will not put bad light on department, or is against provisions of Official Secrets Act or against Public policy.

In what pretext you are asking the question.

Nothing going to happen so enjoy but should not be against any way against the professional ethics.

1. As per the information mentioned in the present query, makes it little clear but not in detail as to what exactly you need to know, still would try to answer your question.
2. I would like to apprise you that as you have published a book (in any way either hard copy or e copy) you haven’t done anything wrong in it.
3. It just that you being the government employee you cannot make it as your business for extra earning though you can keep on writing and get some loyalty for the same, but don’t go for any business sort of in future.