Module com.aoindustries.aoserv.daemon

Package com.aoindustries.aoserv.daemon.util

Class DaemonFileUtils

java.lang.Object

com.aoindustries.aoserv.daemon.util.DaemonFileUtils

public final class DaemonFileUtils
extends Object

Reusable file utilities.

Author:

AO Industries, Inc.

Method Summary

Modifier and Type	Method	Description
static boolean	atomicWrite(PosixFile file, byte[] newContents, long mode, int uid, int gid, PosixFile backupFile, Set<PosixFile> restorecon)	Atomically replaces a file.
static void	copyResource(Class<?> clazz, String resource, OutputStream out)	Copies a resource to the provided output stream.
static void	copyResource(Class<?> clazz, String resource, String filename, int uid, int gid, int mode, int uidMin, int gidMin)	Copies a resource to the provided filename, will not overwrite any existing file.
static void	createEmptyFile(PosixFile uf, int mode, int uid, int gid)	Creates an empty file, if needed.
static PosixFile	findUnusedBackup(String prefix, String separator, String extension)	Finds an unused file, adding separator and "2" for second try, "3" for third, ...
static boolean	ln(String target, PosixFile uf, int uid, int gid)	Creates a symbolic link.
static boolean	ln(String target, PosixFile uf, int uid, int gid, PosixFile backup)	Creates a symbolic link.
static boolean	ln(String target, String filename, int uid, int gid)	Creates a symbolic link.
static boolean	ln(String target, String filename, int uid, int gid, PosixFile backup)	Creates a symbolic link.
static boolean	lnAll(String targetBase, PosixFile src, int uid, int gid, String backupSuffix, String backupSeparator, String backupExtension)	Creates symbolic links to all items in a directory, updating any existing link targets and ownership.
static boolean	lnAll(String targetBase, String srcBase, int uid, int gid)	Creates symbolic links to all items in a directory, updating any existing link targets and ownership.
static boolean	mkdir(PosixFile uf, int mode, int uid, int gid)	Creates a directory, if needed.
static boolean	mkdir(PosixFile uf, int mode, int uid, int gid, PosixFile backup)	Creates a directory, if needed.
static boolean	mkdir(String dirName, int mode, int uid, int gid)	Creates a directory, if needed.
static boolean	mkdir(String dirName, int mode, int uid, int gid, String backupName)	Creates a directory, if needed.
static void	restorecon(Set<PosixFile> restorecon)	Calls "restorecon" on the given set of paths if this server is CentOS 7 and has selinux installed.
static void	stripFilePrefix(PosixFile uf, String prefix, int uidMin, int gidMin)	If the file starts with the provided prefix, strips that prefix from the file.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

copyResource

public static void copyResource(Class<?> clazz,
 String resource,
 OutputStream out)
                         throws IOException

Copies a resource to the provided output stream.

Throws:

IOException

copyResource

public static void copyResource(Class<?> clazz,
 String resource,
 String filename,
 int uid,
 int gid,
 int mode,
 int uidMin,
 int gidMin)
                         throws IOException

Copies a resource to the provided filename, will not overwrite any existing file.

TODO: Copy to a temp file and rename into place.

Throws:

IOException

ln

public static boolean ln(String target,
 String filename,
 int uid,
 int gid)
                  throws IOException

Creates a symbolic link. If the link exists, verifies and updates the target, uid, and gid. To aid in debugging, writes the filename and target to System.err if an IOException occurs; exception is then rethrown.

Returns:

true if any modification was made

Throws:

IOException

ln

public static boolean ln(String target,
 String filename,
 int uid,
 int gid,
 PosixFile backup)
                  throws IOException

Creates a symbolic link. If the link exists, verifies and updates the target, uid, and gid. To aid in debugging, writes the filename and target to System.err if an IOException occurs; exception is then rethrown.

Parameters:

backup - If exists but is not a symbolic link or has a mismatched target, the existing is renamed to backup

Returns:

true if any modification was made

Throws:

IOException

ln

public static boolean ln(String target,
 PosixFile uf,
 int uid,
 int gid)
                  throws IOException

Creates a symbolic link. If the link exists, verifies and updates the target, uid, and gid. To aid in debugging, writes the filename and target to System.err if an IOException occurs; exception is then rethrown.

Returns:

true if any modification was made

Throws:

IOException

ln

public static boolean ln(String target,
 PosixFile uf,
 int uid,
 int gid,
 PosixFile backup)
                  throws IOException

Creates a symbolic link. If the link exists, verifies and updates the target, uid, and gid. To aid in debugging, writes the filename and target to System.err if an IOException occurs; exception is then rethrown.

Parameters:

backup - If exists but is not a symbolic link or has a mismatched target, the existing is renamed to backup

Returns:

true if any modification was made

Throws:

IOException

lnAll

public static boolean lnAll(String targetBase,
 String srcBase,
 int uid,
 int gid)
                     throws IOException

Creates symbolic links to all items in a directory, updating any existing link targets and ownership.

Returns:

true if any modification was made

Throws:

IOException

See Also:

• ln(String, String, int, int)

lnAll

public static boolean lnAll(String targetBase,
 PosixFile src,
 int uid,
 int gid,
 String backupSuffix,
 String backupSeparator,
 String backupExtension)
                     throws IOException

Creates symbolic links to all items in a directory, updating any existing link targets and ownership. Also, any files that are not found in the target are also renamed to backup.

Returns:

true if any modification was made

Throws:

IOException

See Also:

• ln(java.lang.String, com.aoapps.io.posix.PosixFile, int, int, com.aoapps.io.posix.PosixFile)

mkdir

public static boolean mkdir(String dirName,
 int mode,
 int uid,
 int gid)
                     throws IOException

Creates a directory, if needed. If already exists makes sure it is a directory. Also sets or resets the ownership and permissions.

Returns:

true if any modification was made

Throws:

IOException

mkdir

public static boolean mkdir(String dirName,
 int mode,
 int uid,
 int gid,
 String backupName)
                     throws IOException

Creates a directory, if needed. If already exists makes sure it is a directory. Also sets or resets the ownership and permissions.

Parameters:

backupName - If exists but is not a directory, the existing is renamed to backupName

Returns:

true if any modification was made

Throws:

IOException

mkdir

public static boolean mkdir(PosixFile uf,
 int mode,
 int uid,
 int gid)
                     throws IOException

Creates a directory, if needed. If already exists makes sure it is a directory. Also sets or resets the ownership and permissions.

Returns:

true if any modification was made

Throws:

IOException

mkdir

public static boolean mkdir(PosixFile uf,
 int mode,
 int uid,
 int gid,
 PosixFile backup)
                     throws IOException

Creates a directory, if needed. If already exists makes sure it is a directory. Also sets or resets the ownership and permissions.

Parameters:

backup - If exists but is not a directory, the existing is renamed to backup

Returns:

true if any modification was made

Throws:

IOException

createEmptyFile

public static void createEmptyFile(PosixFile uf,
 int mode,
 int uid,
 int gid)
                            throws IOException

Creates an empty file, if needed. If the file exists its contents are not altered. If already exists makes sure it is a file. Also sets or resets the ownership and permissions.

Throws:

IOException

stripFilePrefix

public static void stripFilePrefix(PosixFile uf,
 String prefix,
 int uidMin,
 int gidMin)
                            throws IOException

If the file starts with the provided prefix, strips that prefix from the file. A new temp file is created and then renamed over the old.

Throws:

IOException

atomicWrite

public static boolean atomicWrite(PosixFile file,
 byte[] newContents,
 long mode,
 int uid,
 int gid,
 PosixFile backupFile,
 Set<PosixFile> restorecon)
                           throws IOException

Atomically replaces a file. The file will always exist and will always be either the old of new version.

Will not overwrite the file if the contents already match, but the permissions and ownership will still be verified.

New file contents, both for the file and its optional backup, are written to temp files and then atomically renamed into place, with the backup renamed into place first.

Parameters:

file - the file to overwrite

backupFile - the optional backup file

restorecon - when not null, any file moved into place that might need "restorecon" will be added to the set

Returns:

true when the file is replaced with new content, has ownership updated, or has permissions updated

Throws:

IOException

restorecon

public static void restorecon(Set<PosixFile> restorecon)
                       throws IOException,
SQLException

Calls "restorecon" on the given set of paths if this server is CentOS 7 and has selinux installed.

Throws:

IOException

SQLException

findUnusedBackup

public static PosixFile findUnusedBackup(String prefix,
 String separator,
 String extension)
                                  throws IOException

Finds an unused file, adding separator and "2" for second try, "3" for third, ...

Throws:

IOException