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| author | Sergey Poznyakoff <gray@gnu.org.ua> | 2013-03-21 13:34:51 +0200 |
|---|---|---|
| committer | Sergey Poznyakoff <gray@gnu.org.ua> | 2013-03-21 13:34:51 +0200 |
| commit | 6c6ab3125da430bdaafb9bacc88c32279a961525 (patch) | |
| tree | ef8f4005504a8545eaab5b111890649ba0302d2c /lib/beam/common.in | |
| parent | 194f4b1204d6e49ba0af7dd761f8c794ba37c035 (diff) | |
| download | beam-6c6ab3125da430bdaafb9bacc88c32279a961525.tar.gz beam-6c6ab3125da430bdaafb9bacc88c32279a961525.tar.bz2 | |
Prevent reentrant invocations. Minor bugfix.
At startup a pid file is checked. If it exists, another beam
process is assumed to be running and start up is aborted. Otherwise
a new pid file is created. The existing pid is removed before
exiting (by epilogue_hook).
* backup.in (prologue_hook): Prepend beam_lock.
* lib/beam/common.in (backup_pidfile): New global.
(beam_lock,beam_unlock): New functions.
* lib/beam/s3.sh (s3_getmpoint): Fix regexp to take
into account s3backer invocation without --vhost.
Diffstat (limited to 'lib/beam/common.in')
| -rw-r--r-- | lib/beam/common.in | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/beam/common.in b/lib/beam/common.in index 1be075e..7e69640 100644 --- a/lib/beam/common.in +++ b/lib/beam/common.in @@ -30,6 +30,7 @@ backup_archive_dir= backup_snapshot_dir= backup_verbose= backup_logfile="/var/log/backup" +backup_pidfile="/var/run/beam.pid" backup_tmp_dir=/tmp error() { @@ -47,6 +48,22 @@ abend() { exit $ec } +beam_lock() { + if [ -r $backup_pidfile ]; then + pid=$(head -n 1 $backup_pidfile) + if [ -z "$pid" ]; then + abend "pidfile $backup_pidfile exists but is unreadable or empty" + fi + abend "another beam process (pid $backup_pid) is still running; exiting" + fi + echo $$ > $backup_pidfile || exit 1 + epilogue_hook="$epilogue_hook beam_unlock" +} + +beam_unlock() { + rm -f $backup_pidfile +} + tarcode() { case $1 in 0) logit "success";; |