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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.task.util.yum;
import com.yahoo.vespa.hosted.node.admin.component.TaskContext;
import com.yahoo.vespa.hosted.node.admin.task.util.process.CommandLine;
import com.yahoo.vespa.hosted.node.admin.task.util.process.Terminal;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
/**
* @author hakonhall
*/
public class Yum {
// Note: "(?dm)" makes newline be \n (only), and enables multiline mode where ^$ match lines with find()
private static final Pattern INSTALL_NOOP_PATTERN = Pattern.compile("(?dm)^Nothing to do$");
private static final Pattern UPGRADE_NOOP_PATTERN = Pattern.compile("(?dm)^No packages marked for update$");
private static final Pattern REMOVE_NOOP_PATTERN = Pattern.compile("(?dm)^No Packages marked for removal$");
private static final Pattern UNKNOWN_PACKAGE_PATTERN = Pattern.compile(
"(?dm)^No package ([^ ]+) available\\.$");
private final Terminal terminal;
public Yum(Terminal terminal) {
this.terminal = terminal;
}
public GenericYumCommand install(YumPackageName... packages) {
return newYumCommand("install", packages, INSTALL_NOOP_PATTERN);
}
public GenericYumCommand install(String package1, String... packages) {
return install(toYumPackageNameArray(package1, packages));
}
public GenericYumCommand upgrade(YumPackageName... packages) {
return newYumCommand("upgrade", packages, UPGRADE_NOOP_PATTERN);
}
public GenericYumCommand upgrade(String package1, String... packages) {
return upgrade(toYumPackageNameArray(package1, packages));
}
public GenericYumCommand remove(YumPackageName... packages) {
return newYumCommand("remove", packages, REMOVE_NOOP_PATTERN);
}
public GenericYumCommand remove(String package1, String... packages) {
return remove(toYumPackageNameArray(package1, packages));
}
static YumPackageName[] toYumPackageNameArray(String package1, String... packages) {
YumPackageName[] array = new YumPackageName[1 + packages.length];
array[0] = YumPackageName.fromString(package1);
for (int i = 0; i < packages.length; ++i) {
array[1 + i] = YumPackageName.fromString(packages[i]);
}
return array;
}
private GenericYumCommand newYumCommand(String yumCommand,
YumPackageName[] packages,
Pattern noopPattern) {
return new GenericYumCommand(
terminal,
yumCommand,
Arrays.asList(packages),
noopPattern);
}
public static class GenericYumCommand {
private final Terminal terminal;
private final String yumCommand;
private final List<YumPackageName> packages;
private final Pattern commandOutputNoopPattern;
private Optional<String> enabledRepo = Optional.empty();
private boolean lockVersion = false;
private GenericYumCommand(Terminal terminal,
String yumCommand,
List<YumPackageName> packages,
Pattern commandOutputNoopPattern) {
this.terminal = terminal;
this.yumCommand = yumCommand;
this.packages = packages;
this.commandOutputNoopPattern = commandOutputNoopPattern;
if (packages.isEmpty() && ! "upgrade".equals(yumCommand)) {
throw new IllegalArgumentException("No packages specified");
}
}
@SuppressWarnings("unchecked")
public GenericYumCommand enableRepo(String repo) {
enabledRepo = Optional.of(repo);
return this;
}
/**
* Ensure the version of the installs are locked.
*
* <p>WARNING: In order to simplify the user interface of {@link #lockVersion()},
* the package name specified in the command, e.g. {@link #install(String, String...)}, MUST be of
* a simple format, see {@link YumPackageName#fromString(String)}.
*/
public GenericYumCommand lockVersion() {
// Verify each package has sufficient info to form a proper version lock name.
packages.forEach(YumPackageName::toVersionLockName);
lockVersion = true;
return this;
}
public boolean converge(TaskContext context) {
Set<String> packageNamesToLock = new HashSet<>();
Set<String> fullPackageNamesToLock = new HashSet<>();
if (lockVersion) {
// Remove all locks for other version
packages.forEach(packageName -> {
packageNamesToLock.add(packageName.getName());
fullPackageNamesToLock.add(packageName.toVersionLockName());
});
terminal.newCommandLine(context)
.add("yum", "--quiet", "versionlock", "list")
.executeSilently()
.getOutputLinesStream()
.map(YumPackageName::parseString)
.filter(Optional::isPresent)
.map(Optional::get)
.forEach(packageName -> {
// Ignore lines for other packages
if (packageNamesToLock.contains(packageName.getName())) {
// If existing lock doesn't exactly match the full package name,
// it means it's locked to another version and we must remove that lock.
String versionLockName = packageName.toVersionLockName();
if (!fullPackageNamesToLock.remove(versionLockName)) {
terminal.newCommandLine(context)
.add("yum", "versionlock", "delete", versionLockName)
.execute();
}
}
});
}
CommandLine commandLine = terminal.newCommandLine(context);
commandLine.add("yum", yumCommand, "--assumeyes");
enabledRepo.ifPresent(repo -> commandLine.add("--enablerepo=" + repo));
commandLine.add(packages.stream().map(YumPackageName::toName).collect(Collectors.toList()));
// There's no way to figure out whether a yum command would have been a no-op.
// Therefore, run the command and parse the output to decide.
boolean modifiedSystem = commandLine
.executeSilently()
.mapOutput(this::mapOutput);
if (modifiedSystem) {
commandLine.recordSilentExecutionAsSystemModification();
}
fullPackageNamesToLock.forEach(fullPackageName ->
terminal.newCommandLine(context)
.add("yum", "versionlock", "add", fullPackageName)
.execute());
modifiedSystem |= !fullPackageNamesToLock.isEmpty();
return modifiedSystem;
}
private boolean mapOutput(String output) {
Matcher unknownPackageMatcher = UNKNOWN_PACKAGE_PATTERN.matcher(output);
if (unknownPackageMatcher.find()) {
throw new IllegalArgumentException("Unknown package: " + unknownPackageMatcher.group(1));
}
return !commandOutputNoopPattern.matcher(output).find();
}
}
}
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