static IEnumerable <string> GetJavaAlternativesJdkPaths()
{
var alternatives = Path.GetFullPath("/usr/sbin/update-java-alternatives");
if (!File.Exists(alternatives))
{
return(Enumerable.Empty <string> ());
}
var psi = new ProcessStartInfo {
FileName = alternatives,
Arguments = "-l",
};
var paths = new List <string> ();
ProcessUtils.Exec(psi, (o, e) => {
if (string.IsNullOrWhiteSpace(e.Data))
{
return;
}
// Example line:
// java-1.8.0-openjdk-amd64 1081 /usr/lib/jvm/java-1.8.0-openjdk-amd64
var columns = e.Data.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
if (columns.Length <= 2)
{
return;
}
paths.Add(columns [2]);
});
return(paths);
}
static Dictionary <string, List <string> > GetJavaProperties(string java)
{
var javaProps = new ProcessStartInfo {
FileName = java,
Arguments = "-XshowSettings:properties -version",
};
var props = new Dictionary <string, List <string> > ();
string curKey = null;
if (!AnySystemJavasInstalled() && (java == "/usr/bin/java" || java == "java"))
{
return(props);
}
ProcessUtils.Exec(javaProps, (o, e) => {
const string ContinuedValuePrefix = " ";
const string NewValuePrefix = " ";
const string NameValueDelim = " = ";
if (string.IsNullOrEmpty(e.Data))
{
return;
}
if (e.Data.StartsWith(ContinuedValuePrefix, StringComparison.Ordinal))
{
if (curKey == null)
{
throw new InvalidOperationException($"Unknown property key for value {e.Data}!");
}
props [curKey].Add(e.Data.Substring(ContinuedValuePrefix.Length));
return;
}
if (e.Data.StartsWith(NewValuePrefix, StringComparison.Ordinal))
{
var delim = e.Data.IndexOf(NameValueDelim, StringComparison.Ordinal);
if (delim <= 0)
{
return;
}
curKey = e.Data.Substring(NewValuePrefix.Length, delim - NewValuePrefix.Length);
var value = e.Data.Substring(delim + NameValueDelim.Length);
List <string> values;
if (!props.TryGetValue(curKey, out values))
{
props.Add(curKey, values = new List <string> ());
}
values.Add(value);
}
});
return(props);
}
static IEnumerable <string> GetLibexecJdkPaths(Action <TraceLevel, string> logger)
{
var java_home = Path.GetFullPath("/usr/libexec/java_home");
if (!File.Exists(java_home))
{
yield break;
}
var jhp = new ProcessStartInfo {
FileName = java_home,
Arguments = "-X",
};
var xml = new StringBuilder();
ProcessUtils.Exec(jhp, (o, e) => {
if (string.IsNullOrEmpty(e.Data))
{
return;
}
xml.Append(e.Data);
}, includeStderr: false);
var plist = XElement.Parse(xml.ToString());
foreach (var info in plist.Elements("array").Elements("dict"))
{
var JVMHomePath = (XNode)info.Elements("key").FirstOrDefault(e => e.Value == "JVMHomePath");
if (JVMHomePath == null)
{
continue;
}
while (JVMHomePath.NextNode.NodeType != XmlNodeType.Element)
{
JVMHomePath = JVMHomePath.NextNode;
}
var strElement = (XElement)JVMHomePath.NextNode;
var path = strElement.Value;
yield return(path);
}
}
