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Fix when plugins directory is symlink 

This commit fixes an issue with the plugins directory being a symbolic
link. Namely, the install plugins command attempts to always create the
plugins directory just in case it does not exist. The JDK method used
here guarantees that the directory is created, and an exception is not
thrown if the directory could not be created because it already
exists. The problem is that this JDK method does not respect symlinks so
its internal existence checks fails, it proceeds to attempt to create
the directory, but the directory creation fails because the symlink
exists. This is documented as being not an issue. We work around this by
checking if there is a symlink where we expect the plugins directory to
be, and only attempt to create if not. We add a unit test that plugin
installation to a symlinked plugins directory works as expected.
This commit is contained in:
Jason Tedor 2016-05-26 14:10:32 -04:00
parent d29844e597
commit f16f65741e
2 changed files with 25 additions and 1 deletions
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2
core/src/main/java/org/elasticsearch/plugins/InstallPluginCommand.java
View File

@ -304,7 +304,9 @@ class InstallPluginCommand extends SettingCommand {
// be on the safe side: do not rely on that directories are always extracted
// before their children (although this makes sense, but is it guaranteed?)
if (!Files.isSymbolicLink(targetFile.getParent())) {
Files.createDirectories(targetFile.getParent());
}
if (entry.isDirectory() == false) {
try (OutputStream out = Files.newOutputStream(targetFile)) {
int len;

22
qa/vagrant/src/test/resources/packaging/scripts/module_and_plugin_test_cases.bash
View File

@ -113,6 +113,28 @@ fi
fi
}
@test "[$GROUP] install jvm-example plugin with a symlinked plugins path" {
# Clean up after the last time this test was run
rm -rf /tmp/plugins.*
rm -rf /tmp/old_plugins.*
rm -rf "$ESPLUGINS"
local es_plugins=$(mktemp -d -t 'plugins.XXXX')
chown -R elasticsearch:elasticsearch "$es_plugins"
ln -s "$es_plugins" "$ESPLUGINS"
install_jvm_example
start_elasticsearch_service
# check that symlinked plugin was actually picked up
curl -s localhost:9200/_cat/configured_example | sed 's/ *$//' > /tmp/installed
echo "foo" > /tmp/expected
diff /tmp/installed /tmp/expected
stop_elasticsearch_service
remove_jvm_example
unlink "$ESPLUGINS"
}
@test "[$GROUP] install jvm-example plugin with a custom CONFIG_DIR" {
# Clean up after the last time we ran this test
rm -rf /tmp/config.*