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pid_check: verify older PID's existence.

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If $PIDFILE exists, verify whether it refers to a running
process. This way the amount of false positives is greatly
reduced, which is a good thing during development when
a crash can terminate sbopkg leaving the $PIDFILE in place.

Signed-off-by: Mauro Giachero <mauro.giachero@gmail.com>
This commit is contained in:
mauro.giachero 2009-01-22 11:28:16 +00:00
parent 52cbcbcbde
commit cd1f6aa495
1 changed files with 23 additions and 11 deletions
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34
src/usr/bin/sbopkg
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@ -133,20 +133,32 @@ directory_checks () {
pid_check () { pid_check () {
# Set and check for pid file. # Set and check for pid file.
local PIDFILE OTHERPID
PIDFILE=$TMP/sbopkg.pid PIDFILE=$TMP/sbopkg.pid
if [ -e $PIDFILE ]; then if [ -e $PIDFILE ]; then
echo # When things go haywire and sbopkg crashes (this happens only on
echo "Another instance of sbopkg appears to be running" # development versions, of course ;-)) the PIDFILE isn't deleted and
echo "with process id $(cat $PIDFILE). Running more than" # triggers the error below on the following run.
echo "one instance of sbopkg is not recommended." # Perform a basic test to reduce the amount of false positives. Note
echo # that no check on the file name is performed, to avoid missing true
echo "If this is incorrect, you can delete the lockfile" # positives in the (rare, but possible) cases where the user renames
echo "'${PIDFILE}' and restart. Exiting now." # the sbopkg script.
exit 1 OTHERPID=$(cat $PIDFILE)
else if [[ -n $(ps h --pid $OTHERPID) ]]; then
cleanup echo
echo $$ > $PIDFILE echo "Another instance of sbopkg appears to be running"
echo "with process id $OTHERPID. Running more than"
echo "one instance of sbopkg is not recommended."
echo
echo "If this is incorrect, you can delete the lockfile"
echo "'${PIDFILE}' and restart. Exiting now."
exit 1
fi
fi fi
cleanup
echo $$ > $PIDFILE
} }
has_root () { has_root () {