trunk/userspace-package-management/write-lock-test.sh

#!/bin/sh


vo_sw_dir=${HOME}/vosw

error() {
    echo $@
    exit 1
}

log() {
    echo LOG: $@
}

get_write_lock() {
    log "Checking if the vo software area is writable."
    if [ -z $vo_sw_dir ] ; then
        error "\$$vo_sw_dir_var not set."
    fi

    if [ ! -w $vo_sw_dir ] ; then
        error "\$$vo_sw_dir_var ($vo_sw_dir) is not writable. (Check your proxy: are you the VO software manager?)" 
    fi
    log "$vo_sw_dir writable OK."
    # now do the lockfile shuffle
    lockfile=$vo_sw_dir/pkgsrc-lock
    log "checking lockfile $lockfile"
    if [ -f $lockfile ]; then
        log "lockfile exists."
        ls -l $lockfile
        if [ -z `find $lockfile -mmin -30` ]; then
            log "stale lockfile ($lockfile is older than 30 minutes)"
            rm -f $lockfile || error "could not remove $lockfile. Call help."
        else
            log "lockfile is still fresh."
            return 1
        fi
    else
        log "no lockfile found. Setting lock"
    fi
    # At this point, we've concluded we should try and set the lockfile.
    # be careful to avoid race conditions (although rare).
    log "attempting to get lock."
    a=`mktemp $vo_sw_dir/pkgsrc-lock.XXXXXXXXXX` || error "mktemp failed"
    ln $a $lockfile
    if [ $? -ne 0 ]; then
        log "failed to obtain lock"
        rm $a
        return 1
    fi
    log "lock set"
    rm $a
    unset a
    trap "rm -f $lockfile" INT TERM EXIT
    return 0
}

echo "try 1:"
get_write_lock
if [ $? -ne 0 ]; then
    echo fail
else
    echo ok
fi

echo "try 2:"
get_write_lock
if [ $? -ne 0 ]; then
    echo fail
else
    echo ok
fi
1	dennisvd	1904	#!/bin/sh
2
3
4			vo_sw_dir=${HOME}/vosw
5
6			error() {
7			echo $@
8			exit 1
9			}
10
11			log() {
12			echo LOG: $@
13			}
14
15			get_write_lock() {
16			log "Checking if the vo software area is writable."
17			if [ -z $vo_sw_dir ] ; then
18			error "\$$vo_sw_dir_var not set."
19			fi
20
21			if [ ! -w $vo_sw_dir ] ; then
22			error "\$$vo_sw_dir_var ($vo_sw_dir) is not writable. (Check your proxy: are you the VO software manager?)"
23			fi
24			log "$vo_sw_dir writable OK."
25			# now do the lockfile shuffle
26			lockfile=$vo_sw_dir/pkgsrc-lock
27			log "checking lockfile $lockfile"
28			if [ -f $lockfile ]; then
29			log "lockfile exists."
30			ls -l $lockfile
31			if [ -z `find $lockfile -mmin -30` ]; then
32			log "stale lockfile ($lockfile is older than 30 minutes)"
33			rm -f $lockfile \|\| error "could not remove $lockfile. Call help."
34			else
35			log "lockfile is still fresh."
36			return 1
37			fi
38			else
39			log "no lockfile found. Setting lock"
40			fi
41			# At this point, we've concluded we should try and set the lockfile.
42			# be careful to avoid race conditions (although rare).
43			log "attempting to get lock."
44			a=`mktemp $vo_sw_dir/pkgsrc-lock.XXXXXXXXXX` \|\| error "mktemp failed"
45			ln $a $lockfile
46			if [ $? -ne 0 ]; then
47			log "failed to obtain lock"
48			rm $a
49			return 1
50			fi
51			log "lock set"
52			rm $a
53			unset a
54			trap "rm -f $lockfile" INT TERM EXIT
55			return 0
56			}
57
58			echo "try 1:"
59			get_write_lock
60			if [ $? -ne 0 ]; then
61			echo fail
62			else
63			echo ok
64			fi
65
66			echo "try 2:"
67			get_write_lock
68			if [ $? -ne 0 ]; then
69			echo fail
70			else
71			echo ok
72			fi
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