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abrt-harvest-vmcore
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#!/usr/bin/python """ This script is meant to be run once at system startup after abrtd is up and running. It moves all vmcore directories in kdump's dump directory (which are presumably created by kdump) to abrtd spool directory. The goal is to let abrtd notice and process them as new problem data dirs. """ import os import sys import shutil import time import hashlib import augeas from subprocess import Popen, PIPE import problem import report def errx(message, code=1): sys.stderr.write(message) sys.stderr.write("\n") sys.stderr.flush() sys.exit(code) def get_augeas(module, file_path): """ A function for efficient configuration of Augeas. Augeas modules are placed in /usr/share/augeas/lenses/dist """ aug_obj = augeas.Augeas(flags=augeas.Augeas.NO_MODL_AUTOLOAD) aug_obj.set("/augeas/load/{0}/lens".format(module), "{0}.lns".format(module)) aug_obj.set("/augeas/load/{0}/incl".format(module), file_path) aug_obj.load() return aug_obj def get_mount_point(part_id): """ A function used to look up a mount point of the provided identifier using 'findmnt' system utility. part_id - device node, label or uuid """ try: proc = Popen(["/usr/bin/findmnt", "--noheadings", "--first-only", "--raw", "--evaluate", "--output", "TARGET", part_id], stdout=PIPE, stderr=PIPE) out, err = proc.communicate() if err: errx("Error finding mountpoint of '{0}': {1}" .format(devpath, err)) result = out.strip() if proc.returncode != 0 or not result: errx("Cannot find mountpoint of '{0}'".format(part_id)) return result except OSError as ex: errx("Cannot run 'findmnt': {1}".format(str(ex))) def parse_kdump(): """ This function parses /etc/kdump.conf to get a path to kdump's dump directory. """ # default dump_path = '/var/crash' # filesystem types that can be used by kdump for dumping fs_types = ['ext4', 'ext3', 'ext2', 'minix', 'btrfs', 'xfs'] if not os.access('/etc/kdump.conf', os.R_OK): sys.stderr.write("/etc/kdump.conf not readable, using " "default path '%s'\n" % dump_path) return dump_path aug_obj = get_augeas("Kdump", "/etc/kdump.conf") # check for path variable in kdump.conf kdump_path = aug_obj.get("/files/etc/kdump.conf/path") if kdump_path: dump_path = kdump_path # default partition = None # first uncommented fs_type partition instruction for fs_type in fs_types: result = aug_obj.get("/files/etc/kdump.conf/" + fs_type) if result: partition = result break if partition: if os.path.isabs(dump_path): # path is absolute, change it to relative dump_path = dump_path.lstrip("/") mount_point = get_mount_point(partition) path = os.path.join(mount_point, dump_path) else: path = dump_path # full path to the dump directory return path def create_abrtd_info(dest, uuid): """ A simple function to write important information for the abrt daemon into the vmcore directory to let abrtd know what kind of problem it is. dest - path to the vmcore directory uuid - unique indentifier of the vmcore """ dd = report.dd_create(dest, 0) if dd is None: return None dd.create_basic_files(0) dd.save_text('analyzer', 'vmcore') dd.save_text('type', 'vmcore') dd.save_text('component', 'kernel') dd.save_text('uuid', uuid) return dd def delete_and_close(dd): """ Deletes the given dump directory and closes it. dd - dump directory object """ # Save the directory name as the directory object could be destroyed during # delete(). dd_dirname = dd.name if not dd.delete() == 0: sys.stderr.write("Unable to delete '%s'\n" % (dd_dirname)) return dd.close() def harvest_vmcore(): """ This function moves vmcore directories from kdump's dump dir to abrt's dump dir and notifies abrt. The script also creates additional files used to tell abrt what kind of problem it is and creates an uuid from the vmcore using a sha1 hash function. """ dump_dir = parse_kdump() if not os.access(dump_dir, os.R_OK): sys.stderr.write("Dump directory '%s' not accessible. " "Exiting.\n" % dump_dir) sys.exit(1) # Wait for abrtd to start. Give it at least 1 second to initialize. for i in xrange(10): if i is 9: sys.exit(1) elif os.system('pidof abrtd >/dev/null'): time.sleep(1) else: break # Check abrt config files for copy/move settings and try: conf = problem.load_plugin_conf_file("vmcore.conf") except OSError as ex: sys.stderr.write(str(ex)) sys.exit(1) else: copyvmcore = conf.get("CopyVMcore", "no") try: conf = problem.load_conf_file("abrt.conf") except OSError as ex: sys.stderr.write(str(ex)) sys.exit(1) else: abrtdumpdir = conf.get("DumpLocation", "/var/spool/abrt") try: filelist = os.listdir(dump_dir) except OSError: sys.stderr.write("Dump directory '%s' not accessible. " "Exiting.\n" % dump_dir) sys.exit(1) # Go through all directories in core dump directory for cfile in filelist: f_full = os.path.join(dump_dir, cfile) if not os.path.isdir(f_full): continue try: vmcoredirfilelist = os.listdir(f_full) except OSError as ex: sys.stderr.write("VMCore dir '%s' not accessible.\n" % f_full) continue else: if all(("vmcore" != ff for ff in vmcoredirfilelist if os.path.isfile(os.path.join(f_full, ff)))): sys.stderr.write( "VMCore dir '%s' doesn't contain 'vmcore' file.\n" % f_full) continue # We use .new suffix - we must make sure abrtd doesn't try # to process partially-copied directory. destdir = os.path.join(abrtdumpdir, ('vmcore-' + cfile)) destdirnew = destdir + '.new' # Did we already copy it last time we booted? if os.path.isdir(destdir): continue if os.path.isdir(destdirnew): continue # TODO: need to generate *real* UUID, # one which has a real chance of catching dups! # This one generates different hashes even for similar cores: hashobj = hashlib.sha1() # Iterate over the file a line at a time in order to not load the whole # vmcore file with open(os.path.join(f_full, 'vmcore'), 'r') as corefile: for line in corefile: hashobj.update(line) dd = create_abrtd_info(destdirnew, hashobj.hexdigest()) if dd is None: sys.stderr.write("Unable to create problem directory info") continue # Copy/move vmcore directory to abrt spool dir. for name in os.listdir(f_full): full_name = os.path.join(f_full, name) # Skip sub-directories, abrt ignores them in its processing anyway if not os.path.isfile(full_name): continue try: if not dd.copy_file(name, full_name) == 0: raise OSError except (OSError, shutil.Error): sys.stderr.write("Unable to copy '%s' to '%s'. Skipping\n" % (full_name, destdirnew)) delete_and_close(dd) continue # Get rid of the .new suffix if not dd.rename(destdir) == 0: sys.stderr.write("Unable to rename '%s' to '%s'. Skipping\n" % (destdirnew, destdir)) delete_and_close(dd) continue dd.close() if copyvmcore == 'no': try: shutil.rmtree(f_full) except OSError: sys.stderr.write("Unable to delete '%s'. Ignoring\n" % f_full) problem.notify_new_path(destdir) if __name__ == '__main__': harvest_vmcore()