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Allow Logstash to be launched from a symlink

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These changes allow Logstash to be launched from a symlink _only_ when the `readlink`, or suitable version of `stat` binaries are present. An error message will result if Logstash is launched from a symlink and the path cannot be discovered by one of these two methods.  The message will advise the user to use the full path instead of a symlink to launch Logstash.

fixes #4291
This commit is contained in:
Aaron Mildenstein 2015-12-01 14:03:32 -07:00 • committed by Suyog Rao
parent 44edf5bd00
commit 68bdde886a
2 changed files with 50 additions and 2 deletions
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26
bin/logstash
View file

@ -19,7 +19,31 @@
# DEBUG=1 to output debugging information
unset CDPATH
. "$(cd `dirname $0`/..; pwd)/bin/logstash.lib.sh"
# This unwieldy bit of scripting is to try to catch instances where Logstash
# was launched from a symlink, rather than a full path to the Logstash binary
if [ -L $0 ]; then
# Launched from a symlink
# --Test for the readlink binary
RL=$(which readlink)
if [ $? -eq 0 ]; then
# readlink exists
SOURCEPATH=$($RL $0)
else
# readlink not found, attempt to parse the output of stat
SOURCEPATH=$(stat -c %N $0 | awk '{print $3}' | sed -e 's/\‘//' -e 's/\’//')
if [ $? -ne 0 ]; then
# Failed to execute or parse stat
echo "Failed to find source library at path $(cd `dirname $0`/..; pwd)/bin/logstash.lib.sh"
echo "You may need to launch Logstash with a full path instead of a symlink."
exit 1
fi
fi
else
# Not a symlink
SOURCEPATH=$0
fi
. "$(cd `dirname $SOURCEPATH`/..; pwd)/bin/logstash.lib.sh"
setup
ruby_exec "${LOGSTASH_HOME}/lib/bootstrap/environment.rb" "logstash/runner.rb" "$@"

26
bin/logstash.lib.sh
View file

@ -1,5 +1,29 @@
unset CDPATH
LOGSTASH_HOME=$(cd `dirname $0`/..; pwd)
# This unwieldy bit of scripting is to try to catch instances where Logstash
# was launched from a symlink, rather than a full path to the Logstash binary
if [ -L $0 ]; then
# Launched from a symlink
# --Test for the readlink binary
RL=$(which readlink)
if [ $? -eq 0 ]; then
# readlink exists
SOURCEPATH=$($RL $0)
else
# readlink not found, attempt to parse the output of stat
SOURCEPATH=$(stat -c %N $0 | awk '{print $3}' | sed -e 's/\‘//' -e 's/\’//')
if [ $? -ne 0 ]; then
# Failed to execute or parse stat
echo "Failed to set LOGSTASH_HOME from $(cd `dirname $0`/..; pwd)/bin/logstash.lib.sh"
echo "You may need to launch Logstash with a full path instead of a symlink."
exit 1
fi
fi
else
# Not a symlink
SOURCEPATH=$0
fi
LOGSTASH_HOME=$(cd `dirname $SOURCEPATH`/..; pwd)
export LOGSTASH_HOME
# Defaults you can override with environment variables