Add new bot: cancel command

README.md

@@ -548,6 +548,12 @@ submit_command = /usr/bin/sbatch
 
 `submit_command` is the full path to the Slurm job submission command used for submitting batch jobs. You may want to verify if `sbatch` is provided at that path or determine its actual location (using `which sbatch`).
 
+```ini
+cancel_command = /usr/bin/scancel
+```
+
+`cancel_command` is the full path to the Slurm command used for cancelling batch jobs. You may want to verify if `scancel` is provided at that path or determine its actual location (using `which scancel`).
+
 ```ini
 build_permission = -NOT_ALLOWED_GH_ACCOUNT_NAME- [...]
 ```
@@ -560,11 +566,11 @@ name on GitHub. Thus, one could not - by accident - give build permissions to an
 unknown account.
 
 ```ini
-no_build_permission_comment = The `bot: build ...` command has been used by user `{build_labeler}`, but this person does not have permission to trigger builds.
+no_build_permission_comment = GH account `{build_labeler}` is not authorized to trigger or cancel build jobs.
 ```
 
 `no_build_permission_comment` defines a comment (template) that is used when
-the account trying to trigger build jobs has no permission to do so.
+the account trying to trigger or cancel build jobs has no permission to do so.
 
 ```ini
 allow_update_submit_opts = false

app.cfg.example

@@ -155,13 +155,16 @@ slurm_params = --hold
 # full path to the job submission command
 submit_command = /usr/bin/sbatch
 
+# full path to the job cancellation command
+cancel_command = /usr/bin/scancel
+
 # defines which GitHub accounts have the permission to trigger
 # build jobs, i.e., for which accounts the bot acts on `bot: build ...`
 # commands. If the value is left empty, everyone can trigger build jobs.
 build_permission = -NOT_ALLOWED_GH_ACCOUNT_NAME-
 
 # template for comment when user who set a label has no permission to trigger build jobs
-no_build_permission_comment = Label `bot:build` has been set by user `{build_labeler}`, but this person does not have permission to trigger builds
+no_build_permission_comment = GH account `{build_labeler}` is not authorized to trigger or cancel build jobs.
 
 # whether or not to allow updating the submit options via custom module det_submit_opts
 # Should only be enabled (true) with care because this will result in code from the target

eessi_bot_event_handler.py

@@ -29,8 +29,8 @@
 
 # Local application imports (anything from EESSI/eessi-bot-software-layer)
 from connections import github
-from tasks.build import check_build_permission, get_node_types, request_bot_build_issue_comments, \
-    submit_build_jobs
+from tasks.build import cancel_jobs, check_build_permission, get_job_ids, get_node_types, \
+    get_work_dirs, request_bot_build_issue_comments, submit_build_jobs
 from tasks.deploy import deploy_built_artefacts, determine_job_dirs
 from tasks.clean_up import move_to_trash_bin
 from tools import config
@@ -53,6 +53,7 @@
         config.BUILDENV_SETTING_BUILD_JOB_SCRIPT,                  # required
         config.BUILDENV_SETTING_BUILD_LOGS_DIR,                    # optional+recommended
         config.BUILDENV_SETTING_BUILD_PERMISSION,                  # optional+recommended
+        config.BUILDENV_SETTING_CANCEL_COMMAND,                    # required
         config.BUILDENV_SETTING_CONTAINER_CACHEDIR,                # optional+recommended
         # config.BUILDENV_SETTING_CLONE_GIT_REPO_VIA,                # optional
         # config.BUILDENV_SETTING_CVMFS_CUSTOMIZATIONS,              # optional
@@ -102,6 +103,7 @@
     # the poll interval setting is required for the alternative job handover
     # protocol (delayed_begin)
     config.SECTION_JOB_MANAGER: [
+        config.JOB_MANAGER_SETTING_POLL_COMMAND,                   # required
         config.JOB_MANAGER_SETTING_POLL_INTERVAL],                 # required
     config.SECTION_REPO_TARGETS: [
         config.REPO_TARGETS_SETTING_REPOS_CFG_DIR],                # required
@@ -507,7 +509,7 @@ def handle_bot_command_help(self, event_info, bot_command):
         help_msg += "\n  - Commands must be sent with a **new** comment (edits of existing comments are ignored)."
         help_msg += "\n  - A comment may contain multiple commands, one per line."
         help_msg += "\n  - Every command begins at the start of a line and has the syntax `bot: COMMAND [ARGUMENTS]*`"
-        help_msg += "\n  - Currently supported COMMANDs are: `help`, `build`, `show_config`, `status`"
+        help_msg += "\n  - Currently supported COMMANDs are: `help`, `build`, `show_config`, `status`, `cancel`"
         help_msg += "\n"
         help_msg += "\n  For more information, see https://www.eessi.io/docs/bot"
         return help_msg
@@ -679,6 +681,61 @@ def handle_bot_command_status(self, event_info, bot_command):
         else:
             return "\n  - failed to create status comment"
 
+    def handle_bot_command_cancel(self, event_info, bot_command):
+        """
+        Handles bot command 'cancel' by parsing 'jobid:' arguments and
+        cancelling the jobs.
+
+        Args:
+            event_info (dict): event received by event_handler
+            bot_command (EESSIBotCommand): command to be handled
+
+        Returns:
+            comment (string): list of cancelled jobs if any, error message if not
+        """
+        self.log("processing bot command 'cancel'")
+
+        request_body = event_info["raw_request_body"]
+        repo_name = request_body["repository"]["full_name"]
+        pr_number = request_body["issue"]["number"]
+        user = request_body["comment"]["user"]["login"]
+
+        gh = github.get_instance()
+        pr = gh.get_repo(repo_name).get_pull(pr_number)
+
+        # Jobs can only be cancelled by the user who submitted the job
+        # -> No need to proceed if user cannot submit jobs
+        if not check_build_permission(pr, event_info):
+            self.log(f"User '{user}' does not have build permission - skipping cancellation.")
+            return f"\n  - User `{user}` cannot submit or cancel build jobs."
+
+        # Get valid 'jobid:' arguments
+        job_ids = get_job_ids(bot_command.action_filters)
+        if len(job_ids) == 0:
+            self.log("Got no valid job IDs")
+            return "\n  - No valid job IDs were given."
+
+        # Get working directories of jobs
+        work_dirs = get_work_dirs(job_ids, self.cfg)
+        if len(work_dirs) == 0:
+            self.log("None of the given jobs are cancellable")
+            return "\n  - No cancellable jobs were given."
+
+        # Log skipped jobs
+        for job_id in job_ids:
+            if job_id not in work_dirs.keys():
+                log(f"Skipping job {job_id} - not found")
+
+        # Cancel jobs
+        cancelled_jobs = cancel_jobs(work_dirs, user, pr, self.cfg)
+        if len(cancelled_jobs) == 0:
+            return "\n  - No jobs were cancelled."
+        else:
+            comment = ""
+            for job_id in cancelled_jobs:
+                comment += f"\n  - cancelled job `{job_id}`"
+            return comment
+
     def start(self, app, port=3000):
         """
         Logs startup information to shell and log file and starts the app using

tasks/build.py

@@ -34,7 +34,7 @@
 # Local application imports (anything from EESSI/eessi-bot-software-layer)
 from tools import config, cvmfs_repository, job_metadata, pr_comments, run_cmd
 import tools.filter as tools_filter
-from tools.pr_comments import ChatLevels, create_comment
+from tools.pr_comments import ChatLevels, create_comment, update_comment
 from tools.build_params import BUILD_PARAM_ARCH, BUILD_PARAM_ACCEL
 
 # defaults (used if not specified via, eg, 'app.cfg')
@@ -51,7 +51,9 @@
 # other constants
 EXPORT_VARS_FILE = 'export_vars.sh'
 
-Job = namedtuple('Job', ('working_dir', 'arch_target', 'repo_id', 'slurm_opts', 'year_month', 'pr_id', 'accelerator'))
+
+Job = namedtuple('Job',
+                 ('working_dir', 'arch_target', 'repo_id', 'slurm_opts', 'year_month', 'pr_id', 'accelerator', 'owner'))
 
 # global repo_cfg
 repo_cfg = {}
@@ -108,6 +110,10 @@ def get_build_env_cfg(cfg):
     log(f"{fn}(): submit_command '{submit_command}'")
     config_data[config.BUILDENV_SETTING_SUBMIT_COMMAND] = submit_command
 
+    cancel_command = buildenv.get(config.BUILDENV_SETTING_CANCEL_COMMAND)
+    log(f"{fn}(): cancel_command '{cancel_command}'")
+    config_data[config.BUILDENV_SETTING_CANCEL_COMMAND] = cancel_command
+
     job_handover_protocol = buildenv.get(config.BUILDENV_SETTING_JOB_HANDOVER_PROTOCOL)
     slurm_params = buildenv.get(config.BUILDENV_SETTING_SLURM_PARAMS)
     if job_handover_protocol == config.JOB_HANDOVER_PROTOCOL_HOLD_RELEASE:
@@ -582,6 +588,8 @@ def prepare_jobs(pr, cfg, event_info, action_filter, build_params):
     base_branch_name = pr.base.ref
     log(f"{fn}(): pr.base.repo.ref '{base_branch_name}'")
 
+    job_owner = event_info['raw_request_body']['sender']['login']
+
     # create run dir (base directory for potentially several jobs)
     # TODO may still be too early (before we get to any actual job being
     #      prepared below when calling 'download_pr')
@@ -689,7 +697,7 @@ def prepare_jobs(pr, cfg, event_info, action_filter, build_params):
 
             # enlist jobs to proceed
             job = Job(job_dir, partition_info['cpu_subdir'], repo_id, partition_info['slurm_params'], year_month,
-                      pr_id, accelerator)
+                      pr_id, accelerator, job_owner)
             jobs.append(job)
 
     log(f"{fn}(): {len(jobs)} jobs to proceed after applying white list")
@@ -1358,3 +1366,123 @@ def request_bot_build_issue_comments(repo_name, pr_number):
         if len(comments) != 100:
             break
     return status_table
+
+
+def get_job_ids(action_filter):
+    """
+    Gets and validates 'jobid:' arguments.
+
+    Args:
+        action_filter (EESSIBotActionFilter): Instance containing 'jobid:' arguments
+
+    Returns:
+        job_ids (list): valid 'jobid:' arguments
+    """
+    fn = sys._getframe().f_code.co_name
+
+    # Get 'jobid:' arguments
+    job_filter = action_filter.get_filter_by_component(tools_filter.FILTER_COMPONENT_JOBID)
+    if not job_filter:
+        log(f"{fn}(): 'bot: cancel' command needs at least one 'jobid:' argument.")
+        return []
+
+    # Validate job IDs
+    job_ids = []
+    for job_id in job_filter:
+        try:
+            if int(job_id) > 0:
+                job_ids.append(job_id)
+            else:
+                log(f"{fn}(): Invalid job ID: '{job_id}'")
+        except Exception as err:
+            log(f"{fn}(): Invalid job ID: {err}")
+
+    return job_ids
+
+
+def get_work_dirs(job_ids, cfg):
+    """
+    Gets working directories of build jobs.
+
+    Args:
+        job_ids (list): list of job_ids to check.
+        cfg (ConfigParser): Instance containing full configuration from app.cfg
+
+    Returns:
+        work_dirs (dict): dict mapping each job_id to its work_dir
+    """
+    poll_command = cfg[config.SECTION_JOB_MANAGER][config.JOB_MANAGER_SETTING_POLL_COMMAND]
+
+    # squeue only the given job IDs
+    cs_jobs = ",".join(job_ids)
+    command_line = f"{poll_command} --noheader --Format=JobId:0@,WorkDir:0 --job={cs_jobs}"
+    out, err, exit_code = run_cmd(command_line, "Get WorkDirs of jobs")
+
+    # All output lines are formatted as '{job_id}@{work_dir}'
+    work_dirs = {}
+    for line in out.split("\n"):
+        job = [field.strip() for field in line.split("@")]
+        if len(job) != 2:
+            continue
+        work_dirs[job[0]] = job[1]
+
+    return work_dirs
+
+
+def cancel_jobs(jobs, user, pr, cfg):
+    """
+    Cancels the given build jobs.
+
+    Args:
+        jobs (dict): dictionary mapping each job_id to cancel to its work_dir
+        user (str): The user who sent the 'bot: cancel' command
+        pr (github.PullRequest.PullRequest): instance representing the pull request
+        cfg (ConfigParser): Instance containing full configuration from app.cfg
+
+    Returns:
+        cancelled_jobs (list): job_ids of successfully cancelled jobs
+    """
+    fn = sys._getframe().f_code.co_name
+
+    buildenv = get_build_env_cfg(cfg)
+    cancel_command = buildenv[config.BUILDENV_SETTING_CANCEL_COMMAND]
+
+    cancelled_jobs = []
+    for job_id, work_dir in jobs.items():
+        # Get job owner and PR comment ID from metadata
+        metadata_path = os.path.join(work_dir, f"_bot_job{job_id}.metadata")
+        metadata = job_metadata.get_section_from_file(
+            filepath=metadata_path,
+            section=job_metadata.JOB_PR_SECTION,
+        )
+        job_owner = metadata.get(job_metadata.JOB_PR_JOB_OWNER)
+        pr_comment_id = metadata.get(job_metadata.JOB_PR_PR_COMMENT_ID)
+
+        # Only the job owner should be able to cancel a job
+        if job_owner != user:
+            log(f"{fn}(): User {user} did not start job {job_id} - skipping cancellation")
+            continue
+        log(f"{fn}(): Job {job_id} was started by user {user} - cancelling job")
+
+        # Cancel job
+        command_line = f"{cancel_command} --verbose {job_id}"
+        out, err, exit_code = run_cmd(command_line, f"cancel job {job_id}", raise_on_error=False)
+
+        # Check if command was successful
+        if exit_code != 0:
+            log(f"{fn}(): scancel resulted in a non-zero exit code for job {job_id}.")
+            continue
+        if any([line.startswith("scancel: error: ") for line in err.split("\n")]):
+            log(f"{fn}(): Unable to cancel job {job_id}.")
+            continue
+
+        log(f"{fn}(): Cancelled job {job_id}")
+
+        # Update job status table
+        dt = datetime.now(timezone.utc)
+        update = f"\n|{dt.strftime('%b %d %X %Z %Y')}|finished|job id `{job_id}` was cancelled|"
+        update_comment(int(pr_comment_id), pr, update)
+
+        cancelled_jobs.append(job_id)
+
+    return cancelled_jobs

tests/test_bot_job123.metadata

@@ -2,4 +2,5 @@
 repo = test_repo
 pr_number = 999
 pr_comment_id = 77
+job_owner = user01