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- /*
- * Copyright (C) 2008-2009, Google Inc.
- * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
- * Copyright (C) 2010, Matthias Sohn <matthias.sohn@sap.com>
- * Copyright (C) 2010, Christian Halstrick <christian.halstrick@sap.com>
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.dircache;
-
- import java.io.ByteArrayOutputStream;
- import java.io.EOFException;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.OutputStream;
- import java.nio.ByteBuffer;
- import java.security.MessageDigest;
- import java.text.MessageFormat;
- import java.util.Arrays;
-
- import org.eclipse.jgit.errors.CorruptObjectException;
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.lib.AnyObjectId;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.FileMode;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.util.IO;
- import org.eclipse.jgit.util.MutableInteger;
- import org.eclipse.jgit.util.NB;
- import org.eclipse.jgit.util.SystemReader;
-
- /**
- * A single file (or stage of a file) in a {@link DirCache}.
- * <p>
- * An entry represents exactly one stage of a file. If a file path is unmerged
- * then multiple DirCacheEntry instances may appear for the same path name.
- */
- public class DirCacheEntry {
- private static final byte[] nullpad = new byte[8];
-
- /** The standard (fully merged) stage for an entry. */
- public static final int STAGE_0 = 0;
-
- /** The base tree revision for an entry. */
- public static final int STAGE_1 = 1;
-
- /** The first tree revision (usually called "ours"). */
- public static final int STAGE_2 = 2;
-
- /** The second tree revision (usually called "theirs"). */
- public static final int STAGE_3 = 3;
-
- private static final int P_CTIME = 0;
-
- // private static final int P_CTIME_NSEC = 4;
-
- private static final int P_MTIME = 8;
-
- // private static final int P_MTIME_NSEC = 12;
-
- // private static final int P_DEV = 16;
-
- // private static final int P_INO = 20;
-
- private static final int P_MODE = 24;
-
- // private static final int P_UID = 28;
-
- // private static final int P_GID = 32;
-
- private static final int P_SIZE = 36;
-
- private static final int P_OBJECTID = 40;
-
- private static final int P_FLAGS = 60;
- private static final int P_FLAGS2 = 62;
-
- /** Mask applied to data in {@link #P_FLAGS} to get the name length. */
- private static final int NAME_MASK = 0xfff;
-
- private static final int INTENT_TO_ADD = 0x20000000;
- private static final int SKIP_WORKTREE = 0x40000000;
- private static final int EXTENDED_FLAGS = (INTENT_TO_ADD | SKIP_WORKTREE);
-
- private static final int INFO_LEN = 62;
- private static final int INFO_LEN_EXTENDED = 64;
-
- private static final int EXTENDED = 0x40;
- private static final int ASSUME_VALID = 0x80;
-
- /** In-core flag signaling that the entry should be considered as modified. */
- private static final int UPDATE_NEEDED = 0x1;
-
- /** (Possibly shared) header information storage. */
- private final byte[] info;
-
- /** First location within {@link #info} where our header starts. */
- private final int infoOffset;
-
- /** Our encoded path name, from the root of the repository. */
- final byte[] path;
-
- /** Flags which are never stored to disk. */
- private byte inCoreFlags;
-
- DirCacheEntry(final byte[] sharedInfo, final MutableInteger infoAt,
- final InputStream in, final MessageDigest md, final int smudge_s,
- final int smudge_ns) throws IOException {
- info = sharedInfo;
- infoOffset = infoAt.value;
-
- IO.readFully(in, info, infoOffset, INFO_LEN);
-
- final int len;
- if (isExtended()) {
- len = INFO_LEN_EXTENDED;
- IO.readFully(in, info, infoOffset + INFO_LEN, INFO_LEN_EXTENDED - INFO_LEN);
-
- if ((getExtendedFlags() & ~EXTENDED_FLAGS) != 0)
- throw new IOException(MessageFormat.format(JGitText.get()
- .DIRCUnrecognizedExtendedFlags, String.valueOf(getExtendedFlags())));
- } else
- len = INFO_LEN;
-
- infoAt.value += len;
- md.update(info, infoOffset, len);
-
- int pathLen = NB.decodeUInt16(info, infoOffset + P_FLAGS) & NAME_MASK;
- int skipped = 0;
- if (pathLen < NAME_MASK) {
- path = new byte[pathLen];
- IO.readFully(in, path, 0, pathLen);
- md.update(path, 0, pathLen);
- } else {
- final ByteArrayOutputStream tmp = new ByteArrayOutputStream();
- {
- final byte[] buf = new byte[NAME_MASK];
- IO.readFully(in, buf, 0, NAME_MASK);
- tmp.write(buf);
- }
- for (;;) {
- final int c = in.read();
- if (c < 0)
- throw new EOFException(JGitText.get().shortReadOfBlock);
- if (c == 0)
- break;
- tmp.write(c);
- }
- path = tmp.toByteArray();
- pathLen = path.length;
- skipped = 1; // we already skipped 1 '\0' above to break the loop.
- md.update(path, 0, pathLen);
- md.update((byte) 0);
- }
-
- try {
- checkPath(path);
- } catch (InvalidPathException e) {
- CorruptObjectException p =
- new CorruptObjectException(e.getMessage());
- if (e.getCause() != null)
- p.initCause(e.getCause());
- throw p;
- }
-
- // Index records are padded out to the next 8 byte alignment
- // for historical reasons related to how C Git read the files.
- //
- final int actLen = len + pathLen;
- final int expLen = (actLen + 8) & ~7;
- final int padLen = expLen - actLen - skipped;
- if (padLen > 0) {
- IO.skipFully(in, padLen);
- md.update(nullpad, 0, padLen);
- }
-
- if (mightBeRacilyClean(smudge_s, smudge_ns))
- smudgeRacilyClean();
- }
-
- /**
- * Create an empty entry at stage 0.
- *
- * @param newPath
- * name of the cache entry.
- * @throws IllegalArgumentException
- * If the path starts or ends with "/", or contains "//" either
- * "\0". These sequences are not permitted in a git tree object
- * or DirCache file.
- */
- public DirCacheEntry(final String newPath) {
- this(Constants.encode(newPath), STAGE_0);
- }
-
- /**
- * Create an empty entry at the specified stage.
- *
- * @param newPath
- * name of the cache entry.
- * @param stage
- * the stage index of the new entry.
- * @throws IllegalArgumentException
- * If the path starts or ends with "/", or contains "//" either
- * "\0". These sequences are not permitted in a git tree object
- * or DirCache file. Or if {@code stage} is outside of the
- * range 0..3, inclusive.
- */
- public DirCacheEntry(final String newPath, final int stage) {
- this(Constants.encode(newPath), stage);
- }
-
- /**
- * Create an empty entry at stage 0.
- *
- * @param newPath
- * name of the cache entry, in the standard encoding.
- * @throws IllegalArgumentException
- * If the path starts or ends with "/", or contains "//" either
- * "\0". These sequences are not permitted in a git tree object
- * or DirCache file.
- */
- public DirCacheEntry(final byte[] newPath) {
- this(newPath, STAGE_0);
- }
-
- /**
- * Create an empty entry at the specified stage.
- *
- * @param path
- * name of the cache entry, in the standard encoding.
- * @param stage
- * the stage index of the new entry.
- * @throws IllegalArgumentException
- * If the path starts or ends with "/", or contains "//" either
- * "\0". These sequences are not permitted in a git tree object
- * or DirCache file. Or if {@code stage} is outside of the
- * range 0..3, inclusive.
- */
- @SuppressWarnings("boxing")
- public DirCacheEntry(byte[] path, final int stage) {
- checkPath(path);
- if (stage < 0 || 3 < stage)
- throw new IllegalArgumentException(MessageFormat.format(
- JGitText.get().invalidStageForPath,
- stage, toString(path)));
-
- info = new byte[INFO_LEN];
- infoOffset = 0;
- this.path = path;
-
- int flags = ((stage & 0x3) << 12);
- if (path.length < NAME_MASK)
- flags |= path.length;
- else
- flags |= NAME_MASK;
- NB.encodeInt16(info, infoOffset + P_FLAGS, flags);
- }
-
- void write(final OutputStream os) throws IOException {
- final int len = isExtended() ? INFO_LEN_EXTENDED : INFO_LEN;
- final int pathLen = path.length;
- os.write(info, infoOffset, len);
- os.write(path, 0, pathLen);
-
- // Index records are padded out to the next 8 byte alignment
- // for historical reasons related to how C Git read the files.
- //
- final int actLen = len + pathLen;
- final int expLen = (actLen + 8) & ~7;
- if (actLen != expLen)
- os.write(nullpad, 0, expLen - actLen);
- }
-
- /**
- * Is it possible for this entry to be accidentally assumed clean?
- * <p>
- * The "racy git" problem happens when a work file can be updated faster
- * than the filesystem records file modification timestamps. It is possible
- * for an application to edit a work file, update the index, then edit it
- * again before the filesystem will give the work file a new modification
- * timestamp. This method tests to see if file was written out at the same
- * time as the index.
- *
- * @param smudge_s
- * seconds component of the index's last modified time.
- * @param smudge_ns
- * nanoseconds component of the index's last modified time.
- * @return true if extra careful checks should be used.
- */
- public final boolean mightBeRacilyClean(final int smudge_s, final int smudge_ns) {
- // If the index has a modification time then it came from disk
- // and was not generated from scratch in memory. In such cases
- // the entry is 'racily clean' if the entry's cached modification
- // time is equal to or later than the index modification time. In
- // such cases the work file is too close to the index to tell if
- // it is clean or not based on the modification time alone.
- //
- final int base = infoOffset + P_MTIME;
- final int mtime = NB.decodeInt32(info, base);
- if (smudge_s == mtime)
- return smudge_ns <= NB.decodeInt32(info, base + 4);
- return false;
- }
-
- /**
- * Force this entry to no longer match its working tree file.
- * <p>
- * This avoids the "racy git" problem by making this index entry no longer
- * match the file in the working directory. Later git will be forced to
- * compare the file content to ensure the file matches the working tree.
- */
- public final void smudgeRacilyClean() {
- // To mark an entry racily clean we set its length to 0 (like native git
- // does). Entries which are not racily clean and have zero length can be
- // distinguished from racily clean entries by checking P_OBJECTID
- // against the SHA1 of empty content. When length is 0 and P_OBJECTID is
- // different from SHA1 of empty content we know the entry is marked
- // racily clean
- final int base = infoOffset + P_SIZE;
- Arrays.fill(info, base, base + 4, (byte) 0);
- }
-
- /**
- * Check whether this entry has been smudged or not
- * <p>
- * If a blob has length 0 we know his id see {@link Constants#EMPTY_BLOB_ID}. If an entry
- * has length 0 and an ID different from the one for empty blob we know this
- * entry was smudged.
- *
- * @return <code>true</code> if the entry is smudged, <code>false</code>
- * otherwise
- */
- public final boolean isSmudged() {
- final int base = infoOffset + P_OBJECTID;
- return (getLength() == 0) && (Constants.EMPTY_BLOB_ID.compareTo(info, base) != 0);
- }
-
- final byte[] idBuffer() {
- return info;
- }
-
- final int idOffset() {
- return infoOffset + P_OBJECTID;
- }
-
- /**
- * Is this entry always thought to be unmodified?
- * <p>
- * Most entries in the index do not have this flag set. Users may however
- * set them on if the file system stat() costs are too high on this working
- * directory, such as on NFS or SMB volumes.
- *
- * @return true if we must assume the entry is unmodified.
- */
- public boolean isAssumeValid() {
- return (info[infoOffset + P_FLAGS] & ASSUME_VALID) != 0;
- }
-
- /**
- * Set the assume valid flag for this entry,
- *
- * @param assume
- * true to ignore apparent modifications; false to look at last
- * modified to detect file modifications.
- */
- public void setAssumeValid(final boolean assume) {
- if (assume)
- info[infoOffset + P_FLAGS] |= ASSUME_VALID;
- else
- info[infoOffset + P_FLAGS] &= ~ASSUME_VALID;
- }
-
- /**
- * @return true if this entry should be checked for changes
- */
- public boolean isUpdateNeeded() {
- return (inCoreFlags & UPDATE_NEEDED) != 0;
- }
-
- /**
- * Set whether this entry must be checked for changes
- *
- * @param updateNeeded
- */
- public void setUpdateNeeded(boolean updateNeeded) {
- if (updateNeeded)
- inCoreFlags |= UPDATE_NEEDED;
- else
- inCoreFlags &= ~UPDATE_NEEDED;
- }
-
- /**
- * Get the stage of this entry.
- * <p>
- * Entries have one of 4 possible stages: 0-3.
- *
- * @return the stage of this entry.
- */
- public int getStage() {
- return (info[infoOffset + P_FLAGS] >>> 4) & 0x3;
- }
-
- /**
- * Returns whether this entry should be skipped from the working tree.
- *
- * @return true if this entry should be skipepd.
- */
- public boolean isSkipWorkTree() {
- return (getExtendedFlags() & SKIP_WORKTREE) != 0;
- }
-
- /**
- * Returns whether this entry is intent to be added to the Index.
- *
- * @return true if this entry is intent to add.
- */
- public boolean isIntentToAdd() {
- return (getExtendedFlags() & INTENT_TO_ADD) != 0;
- }
-
- /**
- * Returns whether this entry is in the fully-merged stage (0).
- *
- * @return true if this entry is merged
- * @since 2.2
- */
- public boolean isMerged() {
- return getStage() == STAGE_0;
- }
-
- /**
- * Obtain the raw {@link FileMode} bits for this entry.
- *
- * @return mode bits for the entry.
- * @see FileMode#fromBits(int)
- */
- public int getRawMode() {
- return NB.decodeInt32(info, infoOffset + P_MODE);
- }
-
- /**
- * Obtain the {@link FileMode} for this entry.
- *
- * @return the file mode singleton for this entry.
- */
- public FileMode getFileMode() {
- return FileMode.fromBits(getRawMode());
- }
-
- /**
- * Set the file mode for this entry.
- *
- * @param mode
- * the new mode constant.
- * @throws IllegalArgumentException
- * If {@code mode} is {@link FileMode#MISSING},
- * {@link FileMode#TREE}, or any other type code not permitted
- * in a tree object.
- */
- public void setFileMode(final FileMode mode) {
- switch (mode.getBits() & FileMode.TYPE_MASK) {
- case FileMode.TYPE_MISSING:
- case FileMode.TYPE_TREE:
- throw new IllegalArgumentException(MessageFormat.format(
- JGitText.get().invalidModeForPath, mode, getPathString()));
- }
- NB.encodeInt32(info, infoOffset + P_MODE, mode.getBits());
- }
-
- void setFileMode(int mode) {
- NB.encodeInt32(info, infoOffset + P_MODE, mode);
- }
-
- /**
- * Get the cached creation time of this file, in milliseconds.
- *
- * @return cached creation time of this file, in milliseconds since the
- * Java epoch (midnight Jan 1, 1970 UTC).
- */
- public long getCreationTime() {
- return decodeTS(P_CTIME);
- }
-
- /**
- * Set the cached creation time of this file, using milliseconds.
- *
- * @param when
- * new cached creation time of the file, in milliseconds.
- */
- public void setCreationTime(final long when) {
- encodeTS(P_CTIME, when);
- }
-
- /**
- * Get the cached last modification date of this file, in milliseconds.
- * <p>
- * One of the indicators that the file has been modified by an application
- * changing the working tree is if the last modification time for the file
- * differs from the time stored in this entry.
- *
- * @return last modification time of this file, in milliseconds since the
- * Java epoch (midnight Jan 1, 1970 UTC).
- */
- public long getLastModified() {
- return decodeTS(P_MTIME);
- }
-
- /**
- * Set the cached last modification date of this file, using milliseconds.
- *
- * @param when
- * new cached modification date of the file, in milliseconds.
- */
- public void setLastModified(final long when) {
- encodeTS(P_MTIME, when);
- }
-
- /**
- * Get the cached size (mod 4 GB) (in bytes) of this file.
- * <p>
- * One of the indicators that the file has been modified by an application
- * changing the working tree is if the size of the file (in bytes) differs
- * from the size stored in this entry.
- * <p>
- * Note that this is the length of the file in the working directory, which
- * may differ from the size of the decompressed blob if work tree filters
- * are being used, such as LF<->CRLF conversion.
- * <p>
- * Note also that for very large files, this is the size of the on-disk file
- * truncated to 32 bits, i.e. modulo 4294967296. If that value is larger
- * than 2GB, it will appear negative.
- *
- * @return cached size of the working directory file, in bytes.
- */
- public int getLength() {
- return NB.decodeInt32(info, infoOffset + P_SIZE);
- }
-
- /**
- * Set the cached size (in bytes) of this file.
- *
- * @param sz
- * new cached size of the file, as bytes. If the file is larger
- * than 2G, cast it to (int) before calling this method.
- */
- public void setLength(final int sz) {
- NB.encodeInt32(info, infoOffset + P_SIZE, sz);
- }
-
- /**
- * Set the cached size (in bytes) of this file.
- *
- * @param sz
- * new cached size of the file, as bytes.
- */
- public void setLength(final long sz) {
- setLength((int) sz);
- }
-
- /**
- * Obtain the ObjectId for the entry.
- * <p>
- * Using this method to compare ObjectId values between entries is
- * inefficient as it causes memory allocation.
- *
- * @return object identifier for the entry.
- */
- public ObjectId getObjectId() {
- return ObjectId.fromRaw(idBuffer(), idOffset());
- }
-
- /**
- * Set the ObjectId for the entry.
- *
- * @param id
- * new object identifier for the entry. May be
- * {@link ObjectId#zeroId()} to remove the current identifier.
- */
- public void setObjectId(final AnyObjectId id) {
- id.copyRawTo(idBuffer(), idOffset());
- }
-
- /**
- * Set the ObjectId for the entry from the raw binary representation.
- *
- * @param bs
- * the raw byte buffer to read from. At least 20 bytes after p
- * must be available within this byte array.
- * @param p
- * position to read the first byte of data from.
- */
- public void setObjectIdFromRaw(final byte[] bs, final int p) {
- final int n = Constants.OBJECT_ID_LENGTH;
- System.arraycopy(bs, p, idBuffer(), idOffset(), n);
- }
-
- /**
- * Get the entry's complete path.
- * <p>
- * This method is not very efficient and is primarily meant for debugging
- * and final output generation. Applications should try to avoid calling it,
- * and if invoked do so only once per interesting entry, where the name is
- * absolutely required for correct function.
- *
- * @return complete path of the entry, from the root of the repository. If
- * the entry is in a subtree there will be at least one '/' in the
- * returned string.
- */
- public String getPathString() {
- return toString(path);
- }
-
- /**
- * Get a copy of the entry's raw path bytes.
- *
- * @return raw path bytes.
- * @since 3.4
- */
- public byte[] getRawPath() {
- return path.clone();
- }
-
- /**
- * Use for debugging only !
- */
- @SuppressWarnings("nls")
- @Override
- public String toString() {
- return getFileMode() + " " + getLength() + " " + getLastModified()
- + " " + getObjectId() + " " + getStage() + " "
- + getPathString() + "\n";
- }
-
- /**
- * Copy the ObjectId and other meta fields from an existing entry.
- * <p>
- * This method copies everything except the path from one entry to another,
- * supporting renaming.
- *
- * @param src
- * the entry to copy ObjectId and meta fields from.
- */
- public void copyMetaData(final DirCacheEntry src) {
- copyMetaData(src, false);
- }
-
- /**
- * Copy the ObjectId and other meta fields from an existing entry.
- * <p>
- * This method copies everything except the path and possibly stage from one
- * entry to another, supporting renaming.
- *
- * @param src
- * the entry to copy ObjectId and meta fields from.
- * @param keepStage
- * if true, the stage attribute will not be copied
- */
- void copyMetaData(final DirCacheEntry src, boolean keepStage) {
- int origflags = NB.decodeUInt16(info, infoOffset + P_FLAGS);
- int newflags = NB.decodeUInt16(src.info, src.infoOffset + P_FLAGS);
- System.arraycopy(src.info, src.infoOffset, info, infoOffset, INFO_LEN);
- final int pLen = origflags & NAME_MASK;
- final int SHIFTED_STAGE_MASK = 0x3 << 12;
- final int pStageShifted;
- if (keepStage)
- pStageShifted = origflags & SHIFTED_STAGE_MASK;
- else
- pStageShifted = newflags & SHIFTED_STAGE_MASK;
- NB.encodeInt16(info, infoOffset + P_FLAGS, pStageShifted | pLen
- | (newflags & ~NAME_MASK & ~SHIFTED_STAGE_MASK));
- }
-
- /**
- * @return true if the entry contains extended flags.
- */
- boolean isExtended() {
- return (info[infoOffset + P_FLAGS] & EXTENDED) != 0;
- }
-
- private long decodeTS(final int pIdx) {
- final int base = infoOffset + pIdx;
- final int sec = NB.decodeInt32(info, base);
- final int ms = NB.decodeInt32(info, base + 4) / 1000000;
- return 1000L * sec + ms;
- }
-
- private void encodeTS(final int pIdx, final long when) {
- final int base = infoOffset + pIdx;
- NB.encodeInt32(info, base, (int) (when / 1000));
- NB.encodeInt32(info, base + 4, ((int) (when % 1000)) * 1000000);
- }
-
- private int getExtendedFlags() {
- if (isExtended())
- return NB.decodeUInt16(info, infoOffset + P_FLAGS2) << 16;
- else
- return 0;
- }
-
- private static void checkPath(byte[] path) {
- try {
- SystemReader.getInstance().checkPath(path);
- } catch (CorruptObjectException e) {
- InvalidPathException p = new InvalidPathException(toString(path));
- p.initCause(e);
- throw p;
- }
- }
-
- static String toString(final byte[] path) {
- return Constants.CHARSET.decode(ByteBuffer.wrap(path)).toString();
- }
-
- static int getMaximumInfoLength(boolean extended) {
- return extended ? INFO_LEN_EXTENDED : INFO_LEN;
- }
- }
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