Sheriffing/How To/Helpers

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Command Line

Terminating many tasks from the command line

If many tasks need to be terminated, e.g. because there is a backlog of gecko-decision-task (and canceling them from Treeherder also uses gecko-decision-task), this can be done with the taskcluster command line client like this:

  • Sign in: eval `taskcluster signin`
  • Log in in the browser, close the browser after you clicked 'Create Client'.
  • Get the list of taskcluster task ids which need to be terminated, e.g. from (create query, run it, download result as .csv file).
  • In a text editor, create a line for each task like taskcluster task cancel GcyOUlbLQhGSy4LU3paGTA with GcyOUlbLQhGSy4LU3paGTA replaced by the task id. E.g. in Notepad++, paste the task ids, select the position left of the first character for each line by positioning the cursor at the start of the file and then selecting the positions with Alt + Shift + click into the first position of the last line and then typing taskcluster task cancel .
  • Save the content as file.
  • Set it as executable with chmod +x
  • Run it with ./

Successful cancellations are indicated by `exception 'canceled'`.

mach file-info bugzilla-component lookup shortcut (mfi)

If the bugzilla product and component for a file or folder have to be looked up on Linux, provide the file name, folder name, the path or only a part of any of this to retrieve this information with

mfi search_term

while in the root folder of the mozilla-unified repository.

  • In your home directory, check if there is a file called .bash_aliases.
  • If not, create it, e.g. with the file manager: menu 'File' > 'New Document'.
  • Add the following code:
mfi() {
    ./mach file-info bugzilla-component `find -path "*$1*" -not -path "./.hg/*" -not -path "./testing/web-platform/meta/*"`
  • Save and close the file.
  • New console windows will be support the mfi command to find matching files and check for their bugzilla products and components. If it doesn't find matches, error messages are shown.


File name

$ mfi browser_treeupdate_canvas.js
Core :: Disability Access APIs

Part of file name

$ mfi treeupdate_canvas.js
Core :: Disability Access APIs
$ mfi wasm/webapi/invalid-code
Core :: Javascript: Web Assembly

Folder name

$ mfi accessible/tests/browser/
Core :: Disability Access APIs

Active tree in command line prompt

Let the command line prompt which tree was active when the last command finished, how many patches are applied locally and if there are uncommitted changes (including files not tracked by version control).

  • In your home directory, open the file called .bashrc.
  • Find this line
    unset color_prompt force_color_prompt
  • After that add the following code:
hg_info() {
    declare tipRevision=`hg log -r . -T {node} 2> /dev/null`
    if [ "$tipRevision" == '' ];then
        echo ''
    declare fxheads=`hg fxheads -T '{label("log.changeset", node)} {label("log.tag", join(fxheads, "+"))}\n' 2> /dev/null`
    declare shortestDistance=-2 # Not found
    declare shortestDistanceTrees=''
    while read -r line; do
        IFS=', ' read -r -a array <<< "$line"
        declare headRevision=${array[0]}
        declare headTrees=${array[1]}
        declare distance=`hg log -r $headRevision::. --template x | wc -c`
        declare distance=$((distance-1))
        if [ "$distance" -gt -1 ];then
            if [ "$shortestDistance" -eq -2 ];then
                declare shortestDistance=$distance
                declare shortestDistanceTrees=$headTrees
            elif [ "$distance" -lt "$shortestDistance" ];then
                    declare shortestDistance=$distance
                    declare shortestDistanceTrees=$headTrees
    done <<< "$fxheads"
    # echo "shortest distance for $shortestDistanceTrees with distance $shortestDistance"
    declare bash_string=''
    if [ "$shortestDistanceTrees" == '' ];then
        declare bash_string=' (?'
        declare bash_string=' '$shortestDistanceTrees
        if [ "$shortestDistance" -eq 0 ];then
            declare bash_string=$bash_string'(0'
            declare bash_string=$bash_string'(+'$shortestDistance''
    declare uncommitChanges=`hg status`
    if [ "$uncommitChanges" == '' ];then
        declare bash_string=$bash_string')'
        declare bash_string=$bash_string'+changes)'
    echo "$bash_string"

export PS1="\u@\h \[\033[32m\]\w\[\033[33m\]\$(hg_info)\[\033[00m\] $ "
  • Save and close the file.

New console windows will show the active tree, the number of patches applied locally and untracked changes including files not tracked by version control (e.g. .rej files from a conflict).

user@VirtualBox ~/mozilla/mozilla-unified beta(+2+changes) $

The active repository is beta, there are 2 local commits and untracked changes (more information about those with hg status).

If you pulled new changes from the server but didn't update the active repository to those, the script will try to find a different tree for which the working directory has all the changesets and e.g. show a big number of changesets for the tree due to that (e.g. central(+67)) or a question mark if it finds no tree fulfilling that condition ((?)).