mercurial: test whether a branch contains a changeset

Question

I wonder whether there is a mercurial command/extension that just tests whether a given changeset is in a branch. The command would be something like:

hg contains [-r branch] changeset_id

and should check whether the given changeset is in the current/given branch, returning just "Yes" or "No".

I know about the "debugancestor" command, but a "Yes/No" answer is way easier to read.

And if there is, is it possible to check for transplanted changesets as well?

EDIT: The scenario is located in a repo where named branches have multiple heads. Lets say a branch is named "dev-X", having more than 1 head and a longer history, too long at least to track it with various graph visualizations. I want to figure out whether a changeset X in branch "dev-X" was merged into another head of "dev-X". Therefore I cannot use branch names but only changeset numbers/hashes to specify a branch.

And to top it all, I'm trying to find out whether changeset X was transplanted there, possibly taking more than 1 transplantation step. I know that the necessary info is stored in mercurial (I've seen it when tampering with the mercurial internals), it's just not accessible via the command line interface.

Answer 1

How about this:

hg log -r changeset_id -b branchname

That will give some output if changeid_id includes changes on branch branchname, otherwise no output is returned.

You could wrap it in a bash function if you want:

function contains() {
    if [ "$(hg log -r $1 -b $2)" == "" ]
    then
        echo no
    else
        echo yes
    fi
}

which does this:

$ contains 0 default
yes
$ contains 0 other   
no

Answer 2

using 1.6 and later with the power of revision sets all you need is

hg log --rev "ancestors(.) and <revNum>"

eg

hg log --rev "ancestors(.) and 1234"

blank means no, output means yes, its in your history. Some of the other solutions posted here wont work if the changeset was created in a named branch, even if it was merged at some point later.