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HADOOP-13434. Add bash quoting to Shell class. (Owen O'Malley)

This commit is contained in:
Arpit Agarwal 2016-08-02 13:40:33 -07:00
parent dc0a17e828
commit 158dd2d5a2
2 changed files with 73 additions and 44 deletions
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103
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/Shell.java
View File

@ -42,7 +42,7 @@ import org.slf4j.LoggerFactory;
* A base class for running a Shell command.
*
* <code>Shell</code> can be used to run shell commands like <code>du</code> or
* <code>df</code>. It also offers facilities to gate commands by
* <code>df</code>. It also offers facilities to gate commands by
* time-intervals.
*/
@InterfaceAudience.Public
@ -118,6 +118,21 @@ public abstract class Shell {
}
}
/**
* Quote the given arg so that bash will interpret it as a single value.
* Note that this quotes it for one level of bash, if you are passing it
* into a badly written shell script, you need to fix your shell script.
* @param arg the argument to quote
* @return the quoted string
*/
static String bashQuote(String arg) {
StringBuilder buffer = new StringBuilder(arg.length() + 2);
buffer.append('\'');
buffer.append(arg.replace("'", "'\\''"));
buffer.append('\'');
return buffer.toString();
}
/** a Unix command to get the current user's name: {@value}. */
public static final String USER_NAME_COMMAND = "whoami";
@ -173,7 +188,7 @@ public abstract class Shell {
/** a Unix command to get the current user's groups list. */
public static String[] getGroupsCommand() {
return (WINDOWS)? new String[]{"cmd", "/c", "groups"}
: new String[]{"bash", "-c", "groups"};
: new String[]{"groups"};
}
/**
@ -184,10 +199,14 @@ public abstract class Shell {
*/
public static String[] getGroupsForUserCommand(final String user) {
//'groups username' command return is inconsistent across different unixes
return WINDOWS ?
new String[]
{getWinUtilsPath(), "groups", "-F", "\"" + user + "\""}
: new String[] {"bash", "-c", "id -gn " + user + "; id -Gn " + user};
if (WINDOWS) {
return new String[]
{getWinUtilsPath(), "groups", "-F", "\"" + user + "\""};
} else {
String quotedUser = bashQuote(user);
return new String[] {"bash", "-c", "id -gn " + quotedUser +
"; id -Gn " + quotedUser};
}
}
/**
@ -199,17 +218,20 @@ public abstract class Shell {
*/
public static String[] getGroupsIDForUserCommand(final String user) {
//'groups username' command return is inconsistent across different unixes
return WINDOWS ?
new String[]
{getWinUtilsPath(), "groups", "-F", "\"" + user + "\""}
: new String[] {"bash", "-c", "id -g " + user + "; id -G " + user};
if (WINDOWS) {
return new String[]{getWinUtilsPath(), "groups", "-F", "\"" + user +
"\""};
} else {
String quotedUser = bashQuote(user);
return new String[] {"bash", "-c", "id -g " + quotedUser + "; id -G " +
quotedUser};
}
}
/** A command to get a given netgroup's user list. */
public static String[] getUsersForNetgroupCommand(final String netgroup) {
//'groups username' command return is non-consistent across different unixes
return WINDOWS ? new String [] {"cmd", "/c", "getent netgroup " + netgroup}
: new String [] {"bash", "-c", "getent netgroup " + netgroup};
return new String[] {"getent", "netgroup", netgroup};
}
/** Return a command to get permission information. */
@ -233,14 +255,15 @@ public abstract class Shell {
/**
* Return a command to set permission for specific file.
*
*
* @param perm String permission to set
* @param recursive boolean true to apply to all sub-directories recursively
* @param file String file to set
* @return String[] containing command and arguments
*/
public static String[] getSetPermissionCommand(String perm,
boolean recursive, String file) {
boolean recursive,
String file) {
String[] baseCmd = getSetPermissionCommand(perm, recursive);
String[] cmdWithFile = Arrays.copyOf(baseCmd, baseCmd.length + 1);
cmdWithFile[cmdWithFile.length - 1] = file;
@ -290,9 +313,9 @@ public abstract class Shell {
if (isSetsidAvailable) {
// Use the shell-builtin as it support "--" in all Hadoop supported OSes
return new String[] { "bash", "-c", "kill -" + code + " -- -" + pid };
return new String[] {"kill", "-" + code, "--", "-" + pid};
} else {
return new String[] { "bash", "-c", "kill -" + code + " " + pid };
return new String[] {"kill", "-" + code, pid };
}
}
@ -310,7 +333,7 @@ public abstract class Shell {
* Returns a File referencing a script with the given basename, inside the
* given parent directory. The file extension is inferred by platform:
* <code>".cmd"</code> on Windows, or <code>".sh"</code> otherwise.
*
*
* @param parent File parent directory
* @param basename String script file basename
* @return File referencing the script in the directory
@ -342,8 +365,8 @@ public abstract class Shell {
public static String[] getRunScriptCommand(File script) {
String absolutePath = script.getAbsolutePath();
return WINDOWS ?
new String[] { "cmd", "/c", absolutePath }
: new String[] { "/bin/bash", absolutePath };
new String[] {"cmd", "/c", absolutePath }
: new String[] {"/bin/bash", bashQuote(absolutePath) };
}
/** a Unix command to set permission: {@value}. */
@ -527,11 +550,11 @@ public abstract class Shell {
/**
* Fully qualify the path to a binary that should be in a known hadoop
* bin location. This is primarily useful for disambiguating call-outs
* to executable sub-components of Hadoop to avoid clashes with other
* executables that may be in the path. Caveat: this call doesn't
* just format the path to the bin directory. It also checks for file
* existence of the composed path. The output of this call should be
* bin location. This is primarily useful for disambiguating call-outs
* to executable sub-components of Hadoop to avoid clashes with other
* executables that may be in the path. Caveat: this call doesn't
* just format the path to the bin directory. It also checks for file
* existence of the composed path. The output of this call should be
* cached by callers.
*
* @param executable executable
@ -848,7 +871,7 @@ public abstract class Shell {
}
/** Run the command. */
private void runCommand() throws IOException {
private void runCommand() throws IOException {
ProcessBuilder builder = new ProcessBuilder(getExecString());
Timer timeOutTimer = null;
ShellTimeoutTimerTask timeoutTimerTask = null;
@ -877,7 +900,7 @@ public abstract class Shell {
}
builder.redirectErrorStream(redirectErrorStream);
if (Shell.WINDOWS) {
synchronized (WindowsProcessLaunchLock) {
// To workaround the race condition issue with child processes
@ -898,7 +921,7 @@ public abstract class Shell {
//One time scheduling.
timeOutTimer.schedule(timeoutTimerTask, timeOutInterval);
}
final BufferedReader errReader =
final BufferedReader errReader =
new BufferedReader(new InputStreamReader(
process.getErrorStream(), Charset.defaultCharset()));
BufferedReader inReader =
@ -936,7 +959,7 @@ public abstract class Shell {
parseExecResult(inReader); // parse the output
// clear the input stream buffer
String line = inReader.readLine();
while(line != null) {
while(line != null) {
line = inReader.readLine();
}
// wait for the process to finish and check the exit code
@ -1073,13 +1096,13 @@ public abstract class Shell {
/**
* A simple shell command executor.
*
*
* <code>ShellCommandExecutor</code>should be used in cases where the output
* of the command needs no explicit parsing and where the command, working
* directory and the environment remains unchanged. The output of the command
* is stored as-is and is expected to be small.
*/
public static class ShellCommandExecutor extends Shell
public static class ShellCommandExecutor extends Shell
implements CommandExecutor {
private String[] command;
@ -1106,7 +1129,7 @@ public abstract class Shell {
/**
* Create a new instance of the ShellCommandExecutor to execute a command.
*
*
* @param execString The command to execute with arguments
* @param dir If not-null, specifies the directory which should be set
* as the current working directory for the command.
@ -1120,7 +1143,7 @@ public abstract class Shell {
* @param inheritParentEnv Indicates if the process should inherit the env
* vars from the parent process or not.
*/
public ShellCommandExecutor(String[] execString, File dir,
public ShellCommandExecutor(String[] execString, File dir,
Map<String, String> env, long timeout, boolean inheritParentEnv) {
command = execString.clone();
if (dir != null) {
@ -1145,7 +1168,7 @@ public abstract class Shell {
+ StringUtils.join(" ", command));
}
}
this.run();
this.run();
}
@Override
@ -1198,7 +1221,7 @@ public abstract class Shell {
/**
* To check if the passed script to shell command executor timed out or
* not.
*
*
* @return if the script timed out.
*/
public boolean isTimedOut() {
@ -1207,15 +1230,15 @@ public abstract class Shell {
/**
* Declare that the command has timed out.
*
*
*/
private void setTimedOut() {
this.timedOut.set(true);
}
/**
* Static method to execute a shell command.
* Covers most of the simple cases without requiring the user to implement
/**
* Static method to execute a shell command.
* Covers most of the simple cases without requiring the user to implement
* the <code>Shell</code> interface.
* @param cmd shell command to execute.
* @return the output of the executed command.
@ -1237,7 +1260,7 @@ public abstract class Shell {
public static String execCommand(Map<String, String> env, String[] cmd,
long timeout) throws IOException {
ShellCommandExecutor exec = new ShellCommandExecutor(cmd, null, env,
ShellCommandExecutor exec = new ShellCommandExecutor(cmd, null, env,
timeout);
exec.execute();
return exec.getOutput();
@ -1275,7 +1298,7 @@ public abstract class Shell {
p.exitValue();
} catch (Exception e) {
//Process has not terminated.
//So check if it has completed
//So check if it has completed
//if not just destroy it.
if (p != null && !shell.completed.get()) {
shell.setTimedOut();

14
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestShell.java
View File

@ -240,9 +240,9 @@ public class TestShell extends Assert {
expectedCommand =
new String[]{getWinUtilsPath(), "task", "isAlive", anyPid };
} else if (Shell.isSetsidAvailable) {
expectedCommand = new String[] { "bash", "-c", "kill -0 -- -" + anyPid };
expectedCommand = new String[] {"kill", "-0", "--", "-" + anyPid };
} else {
expectedCommand = new String[]{ "bash", "-c", "kill -0 " + anyPid };
expectedCommand = new String[] {"kill", "-0", anyPid };
}
Assert.assertArrayEquals(expectedCommand, checkProcessAliveCommand);
}
@ -260,9 +260,9 @@ public class TestShell extends Assert {
expectedCommand =
new String[]{getWinUtilsPath(), "task", "kill", anyPid };
} else if (Shell.isSetsidAvailable) {
expectedCommand = new String[] { "bash", "-c", "kill -9 -- -" + anyPid };
expectedCommand = new String[] {"kill", "-9", "--", "-" + anyPid };
} else {
expectedCommand = new String[]{ "bash", "-c", "kill -9 " + anyPid };
expectedCommand = new String[] {"kill", "-9", anyPid };
}
Assert.assertArrayEquals(expectedCommand, checkProcessAliveCommand);
}
@ -466,4 +466,10 @@ public class TestShell extends Assert {
}
}
@Test
public void testBashQuote() {
assertEquals("'foobar'", Shell.bashQuote("foobar"));
assertEquals("'foo'\\''bar'", Shell.bashQuote("foo'bar"));
assertEquals("''\\''foo'\\''bar'\\'''", Shell.bashQuote("'foo'bar'"));
}
}