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/* |
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** Copyright (c) 2007 D. Richard Hipp |
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** |
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** This program is free software; you can redistribute it and/or |
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** modify it under the terms of the Simplified BSD License (also |
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** known as the "2-Clause License" or "FreeBSD License".) |
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** This program is distributed in the hope that it will be useful, |
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** but without any warranty; without even the implied warranty of |
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** merchantability or fitness for a particular purpose. |
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** |
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** Author contact information: |
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** [email protected] |
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** http://www.hwaci.com/drh/ |
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** |
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******************************************************************************* |
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** |
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** This file implements the undo/redo functionality. |
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*/ |
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#include "config.h" |
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#include "undo.h" |
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#if INTERFACE |
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/* |
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** Possible return values from the undo_maybe_save() routine. |
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*/ |
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#define UNDO_NONE (0) /* Placeholder only used to initialize vars. */ |
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#define UNDO_SAVED_OK (1) /* The specified file was saved successfully. */ |
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#define UNDO_DISABLED (2) /* File not saved, subsystem is disabled. */ |
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#define UNDO_INACTIVE (3) /* File not saved, subsystem is not active. */ |
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#define UNDO_TOOBIG (4) /* File not saved, it exceeded a size limit. */ |
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#endif |
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/* |
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** Undo the change to the file zPathname. zPathname is the pathname |
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** of the file relative to the root of the repository. If redoFlag is |
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** true the redo a change. If there is nothing to undo (or redo) then |
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** this routine is a noop. |
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*/ |
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static void undo_one(const char *zPathname, int redoFlag){ |
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Stmt q; |
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char *zFullname; |
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db_prepare(&q, |
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"SELECT content, existsflag, isExe, isLink FROM undo" |
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" WHERE pathname=%Q AND redoflag=%d", |
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zPathname, redoFlag |
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); |
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if( db_step(&q)==SQLITE_ROW ){ |
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int old_exists; |
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int new_exists; |
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int old_exe; |
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int new_exe; |
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int new_link; |
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int old_link; |
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Blob current; |
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Blob new; |
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zFullname = mprintf("%s%s", g.zLocalRoot, zPathname); |
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old_link = db_column_int(&q, 3); |
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new_exists = file_size(zFullname, RepoFILE)>=0; |
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new_link = file_islink(0); |
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if( new_exists ){ |
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blob_read_from_file(¤t, zFullname, RepoFILE); |
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new_exe = file_isexe(0,0); |
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}else{ |
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blob_zero(¤t); |
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new_exe = 0; |
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} |
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blob_zero(&new); |
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old_exists = db_column_int(&q, 1); |
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old_exe = db_column_int(&q, 2); |
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if( old_exists ){ |
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db_ephemeral_blob(&q, 0, &new); |
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} |
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if( file_unsafe_in_tree_path(zFullname) ){ |
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/* do nothing with this unsafe file */ |
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}else if( old_exists ){ |
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if( new_exists ){ |
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fossil_print("%s %s\n", redoFlag ? "REDO" : "UNDO", zPathname); |
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}else{ |
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fossil_print("NEW %s\n", zPathname); |
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} |
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if( new_exists && (new_link || old_link) ){ |
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file_delete(zFullname); |
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} |
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if( old_link ){ |
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symlink_create(blob_str(&new), zFullname); |
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}else{ |
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blob_write_to_file(&new, zFullname); |
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} |
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file_setexe(zFullname, old_exe); |
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}else{ |
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fossil_print("DELETE %s\n", zPathname); |
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file_delete(zFullname); |
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} |
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blob_reset(&new); |
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free(zFullname); |
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db_finalize(&q); |
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db_prepare(&q, |
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"UPDATE undo SET content=:c, existsflag=%d, isExe=%d, isLink=%d," |
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" redoflag=NOT redoflag" |
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" WHERE pathname=%Q", |
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new_exists, new_exe, new_link, zPathname |
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); |
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if( new_exists ){ |
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db_bind_blob(&q, ":c", ¤t); |
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} |
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db_step(&q); |
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blob_reset(¤t); |
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} |
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db_finalize(&q); |
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} |
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/* |
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** Undo or redo changes to the filesystem. Undo the changes in the |
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** same order that they were originally carried out - undo the oldest |
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** change first and undo the most recent change last. |
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*/ |
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static void undo_all_filesystem(int redoFlag){ |
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Stmt q; |
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db_prepare(&q, |
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"SELECT pathname FROM undo" |
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" WHERE redoflag=%d" |
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" ORDER BY rowid", |
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redoFlag |
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); |
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while( db_step(&q)==SQLITE_ROW ){ |
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const char *zPathname = db_column_text(&q, 0); |
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undo_one(zPathname, redoFlag); |
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} |
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db_finalize(&q); |
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} |
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/* |
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** Undo or redo all undoable or redoable changes. |
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*/ |
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static void undo_all(int redoFlag){ |
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int ucid; |
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int ncid; |
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undo_all_filesystem(redoFlag); |
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db_multi_exec( |
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"CREATE TEMP TABLE undo_vfile_2 AS SELECT * FROM vfile;" |
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"DELETE FROM vfile;" |
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"INSERT INTO vfile SELECT * FROM undo_vfile;" |
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"DELETE FROM undo_vfile;" |
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"INSERT INTO undo_vfile SELECT * FROM undo_vfile_2;" |
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"DROP TABLE undo_vfile_2;" |
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"CREATE TEMP TABLE undo_vmerge_2 AS SELECT * FROM vmerge;" |
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"DELETE FROM vmerge;" |
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"INSERT INTO vmerge SELECT * FROM undo_vmerge;" |
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"DELETE FROM undo_vmerge;" |
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"INSERT INTO undo_vmerge SELECT * FROM undo_vmerge_2;" |
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"DROP TABLE undo_vmerge_2;" |
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); |
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if( db_table_exists("localdb", "undo_stash") ){ |
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if( redoFlag ){ |
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db_multi_exec( |
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"DELETE FROM stash WHERE stashid IN (SELECT stashid FROM undo_stash);" |
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"DELETE FROM stashfile" |
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" WHERE stashid NOT IN (SELECT stashid FROM stash);" |
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); |
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}else{ |
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db_multi_exec( |
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"INSERT OR IGNORE INTO stash SELECT * FROM undo_stash;" |
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"INSERT OR IGNORE INTO stashfile SELECT * FROM undo_stashfile;" |
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); |
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} |
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} |
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ncid = db_lget_int("undo_checkout", 0); |
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ucid = db_lget_int("checkout", 0); |
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db_lset_int("undo_checkout", ucid); |
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db_set_checkout(ncid, 1); |
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} |
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/* |
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** Reset the undo memory. |
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*/ |
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void undo_reset(void){ |
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static const char zSql[] = |
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@ DROP TABLE IF EXISTS undo; |
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@ DROP TABLE IF EXISTS undo_vfile; |
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@ DROP TABLE IF EXISTS undo_vmerge; |
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@ DROP TABLE IF EXISTS undo_stash; |
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@ DROP TABLE IF EXISTS undo_stashfile; |
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; |
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db_exec_sql(zSql); |
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db_lset_int("undo_available", 0); |
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db_lset_int("undo_checkout", 0); |
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} |
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/* |
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** The following variable stores the original command-line of the |
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** command that is a candidate to be undone. |
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*/ |
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static char *undoCmd = 0; |
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/* |
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** This flag is true if we are in the process of collecting file changes |
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** for undo. When this flag is false, undo_save() is a no-op. |
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** |
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** The undoDisable flag, if set, prevents undo from being activated. |
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*/ |
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static int undoActive = 0; |
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static int undoDisable = 0; |
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/* |
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** Capture the current command-line and store it as part of the undo |
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** state. This routine is called before options are extracted from the |
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** command-line so that we can record the complete command-line. |
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*/ |
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void undo_capture_command_line(void){ |
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Blob cmdline; |
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int i; |
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if( undoCmd!=0 || undoDisable ) return; |
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blob_zero(&cmdline); |
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for(i=1; i<g.argc; i++){ |
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if( i>1 ) blob_append(&cmdline, " ", 1); |
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blob_append(&cmdline, g.argv[i], -1); |
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} |
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undoCmd = blob_str(&cmdline); |
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} |
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/* |
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** Begin capturing a snapshot that can be undone. |
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*/ |
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void undo_begin(void){ |
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int cid; |
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static const char zSql[] = |
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@ CREATE TABLE localdb.undo( |
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@ pathname TEXT UNIQUE, -- Name of the file |
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@ redoflag BOOLEAN, -- 0 for undoable. 1 for redoable |
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@ existsflag BOOLEAN, -- True if the file exists |
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@ isExe BOOLEAN, -- True if the file is executable |
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@ isLink BOOLEAN, -- True if the file is symlink |
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@ content BLOB -- Saved content |
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@ ); |
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@ CREATE TABLE localdb.undo_vfile AS SELECT * FROM vfile; |
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@ CREATE TABLE localdb.undo_vmerge AS SELECT * FROM vmerge; |
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; |
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if( undoDisable ) return; |
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undo_reset(); |
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db_exec_sql(zSql); |
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cid = db_lget_int("checkout", 0); |
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db_lset_int("undo_checkout", cid); |
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db_lset_int("undo_available", 1); |
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db_lset("undo_cmdline", undoCmd); |
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undoActive = 1; |
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} |
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/* |
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** Permanently disable undo |
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*/ |
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void undo_disable(void){ |
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undoDisable = 1; |
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} |
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/* |
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** This flag is true if one or more files have changed and have been |
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** recorded in the undo log but the undo log has not yet been committed. |
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** |
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** If a fatal error occurs and this flag is set, that means we should |
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** rollback all the filesystem changes. |
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*/ |
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static int undoNeedRollback = 0; |
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/* |
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** Save the current content of the file zPathname so that it |
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** will be undoable. The name is relative to the root of the |
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** tree. |
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*/ |
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void undo_save(const char *zPathname){ |
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if( undoDisable ) return; |
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if( undo_maybe_save(zPathname, -1)!=UNDO_SAVED_OK ){ |
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fossil_fatal("failed to save undo information for path: %s", |
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zPathname); |
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} |
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} |
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/* |
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** Possibly save the current content of the file zPathname so |
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** that it will be undoable. The name is relative to the root |
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** of the tree. The limit argument may be used to specify the |
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** maximum size for the file to be saved. If the size of the |
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** specified file exceeds this size limit (in bytes), it will |
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** not be saved and an appropriate code will be returned. |
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** |
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** WARNING: Please do NOT call this function with a limit |
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** value less than zero, call the undo_save() |
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** function instead. |
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** |
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** The return value of this function will always be one of the |
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** following codes: |
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** |
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** UNDO_SAVED_OK: The specified file was saved successfully. |
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** |
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** UNDO_DISABLED: The specified file was NOT saved, because the |
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** "undo subsystem" is disabled. This error may |
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** indicate that a call to undo_disable() was |
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** issued. |
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** |
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** UNDO_INACTIVE: The specified file was NOT saved, because the |
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** "undo subsystem" is not active. This error |
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** may indicate that a call to undo_begin() is |
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** missing. |
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** |
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** UNDO_TOOBIG: The specified file was NOT saved, because it |
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** exceeded the specified size limit. It is |
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** impossible for this value to be returned if |
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** the specified size limit is less than zero |
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** (i.e. unlimited). |
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*/ |
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312
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int undo_maybe_save(const char *zPathname, i64 limit){ |
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char *zFullname; |
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i64 size; |
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315
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int result; |
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316
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if( undoDisable ) return UNDO_DISABLED; |
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if( !undoActive ) return UNDO_INACTIVE; |
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zFullname = mprintf("%s%s", g.zLocalRoot, zPathname); |
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size = file_size(zFullname, RepoFILE); |
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if( limit<0 || size<=limit ){ |
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int existsFlag = (size>=0); |
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int isLink = file_islink(zFullname); |
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324
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Stmt q; |
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Blob content; |
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326
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db_prepare(&q, |
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"INSERT OR IGNORE INTO" |
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" undo(pathname,redoflag,existsflag,isExe,isLink,content)" |
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" VALUES(%Q,0,%d,%d,%d,:c)", |
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zPathname, existsFlag, file_isexe(zFullname,RepoFILE), isLink |
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); |
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332
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if( existsFlag ){ |
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blob_read_from_file(&content, zFullname, RepoFILE); |
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db_bind_blob(&q, ":c", &content); |
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} |
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db_step(&q); |
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337
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db_finalize(&q); |
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338
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if( existsFlag ){ |
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blob_reset(&content); |
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340
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} |
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341
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undoNeedRollback = 1; |
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342
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result = UNDO_SAVED_OK; |
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343
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}else{ |
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344
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result = UNDO_TOOBIG; |
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345
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} |
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free(zFullname); |
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return result; |
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348
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} |
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349
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|
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350
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/* |
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351
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** Returns an error message for the undo_maybe_save() return code. |
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352
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** Currently, this function assumes that the caller is using the |
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353
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** returned error message in a context prefixed with "because". |
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*/ |
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355
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const char *undo_save_message(int rc){ |
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356
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static char zRc[32]; |
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357
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|
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358
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switch( rc ){ |
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359
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case UNDO_NONE: return "undo is disabled for this operation"; |
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case UNDO_SAVED_OK: return "the save operation was successful"; |
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361
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case UNDO_DISABLED: return "the undo subsystem is disabled"; |
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362
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case UNDO_INACTIVE: return "the undo subsystem is inactive"; |
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case UNDO_TOOBIG: return "the file is too big"; |
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default: { |
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sqlite3_snprintf(sizeof(zRc), zRc, "of error code %d", rc); |
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} |
|
367
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} |
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return zRc; |
|
369
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} |
|
370
|
|
|
371
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/* |
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372
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** Make the current state of stashid undoable. |
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373
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*/ |
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374
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void undo_save_stash(int stashid){ |
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db_multi_exec( |
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"CREATE TABLE IF NOT EXISTS localdb.undo_stash" |
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377
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" AS SELECT * FROM stash WHERE 0;" |
|
378
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"INSERT INTO undo_stash" |
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379
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" SELECT * FROM stash WHERE stashid=%d;", |
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380
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stashid |
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); |
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382
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db_multi_exec( |
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383
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"CREATE TABLE IF NOT EXISTS localdb.undo_stashfile" |
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384
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" AS SELECT * FROM stashfile WHERE 0;" |
|
385
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"INSERT INTO undo_stashfile" |
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386
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" SELECT * FROM stashfile WHERE stashid=%d;", |
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stashid |
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); |
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389
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} |
|
390
|
|
|
391
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/* |
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392
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** Complete the undo process is one is currently in process. |
|
393
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*/ |
|
394
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void undo_finish(void){ |
|
395
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if( undoActive ){ |
|
396
|
if( undoNeedRollback ){ |
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397
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fossil_print(" \"fossil undo\" is available to undo changes" |
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398
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" to the working checkout.\n"); |
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399
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} |
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400
|
undoActive = 0; |
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401
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undoNeedRollback = 0; |
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402
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} |
|
403
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} |
|
404
|
|
|
405
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/* |
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406
|
** This routine is called when the process aborts due to an error. |
|
407
|
** If an undo was being accumulated but was not finished, attempt |
|
408
|
** to rollback all of the filesystem changes. |
|
409
|
** |
|
410
|
** This rollback occurs, for example, if an "update" or "merge" operation |
|
411
|
** could not run to completion because a file that needed to be written |
|
412
|
** was locked or had permissions turned off. |
|
413
|
*/ |
|
414
|
void undo_rollback(void){ |
|
415
|
if( !undoNeedRollback ) return; |
|
416
|
assert( undoActive ); |
|
417
|
undoNeedRollback = 0; |
|
418
|
undoActive = 0; |
|
419
|
fossil_print("Rolling back prior filesystem changes...\n"); |
|
420
|
undo_all_filesystem(0); |
|
421
|
} |
|
422
|
|
|
423
|
/* |
|
424
|
** COMMAND: undo |
|
425
|
** COMMAND: redo* |
|
426
|
** |
|
427
|
** Usage: %fossil undo ?OPTIONS? ?FILENAME...? |
|
428
|
** or: %fossil redo ?OPTIONS? ?FILENAME...? |
|
429
|
** |
|
430
|
** The undo command reverts the changes caused by the previous command |
|
431
|
** if the previous command is one of the following: |
|
432
|
** * fossil update |
|
433
|
** * fossil merge |
|
434
|
** * fossil revert |
|
435
|
** * fossil stash pop |
|
436
|
** * fossil stash apply |
|
437
|
** * fossil stash drop |
|
438
|
** * fossil stash goto |
|
439
|
** * fossil clean (*see note below*) |
|
440
|
** |
|
441
|
** Note: The "fossil clean" command only saves state for files less than |
|
442
|
** 10MiB in size and so if fossil clean deleted files larger than that, |
|
443
|
** then "fossil undo" will not recover the larger files. |
|
444
|
** |
|
445
|
** If FILENAME is specified then restore the content of the named |
|
446
|
** file(s) but otherwise leave the update or merge or revert in effect. |
|
447
|
** The redo command undoes the effect of the most recent undo. |
|
448
|
** |
|
449
|
** If the -n|--dry-run option is present, no changes are made and instead |
|
450
|
** the undo or redo command explains what actions the undo or redo would |
|
451
|
** have done had the -n|--dry-run been omitted. |
|
452
|
** |
|
453
|
** If the most recent command is not one of those listed as undoable, |
|
454
|
** then the undo command might try to restore the state to be what it was |
|
455
|
** prior to the last undoable command, or it might be a no-op. If in |
|
456
|
** doubt about what the undo command will do, first run it with the -n |
|
457
|
** option. |
|
458
|
** |
|
459
|
** A single level of undo/redo is supported. The undo/redo stack |
|
460
|
** is cleared by the commit and check-out commands. Other commands may |
|
461
|
** or may not clear the undo stack. |
|
462
|
** |
|
463
|
** Future versions of Fossil might add new commands to the set of commands |
|
464
|
** that are undoable. |
|
465
|
** |
|
466
|
** Options: |
|
467
|
** -n|--dry-run Do not make changes, but show what would be done |
|
468
|
** |
|
469
|
** See also: [[commit]], [[status]] |
|
470
|
*/ |
|
471
|
void undo_cmd(void){ |
|
472
|
int isRedo = g.argv[1][0]=='r'; |
|
473
|
int undo_available; |
|
474
|
int dryRunFlag = find_option("dry-run", "n", 0)!=0; |
|
475
|
const char *zCmd = isRedo ? "redo" : "undo"; |
|
476
|
|
|
477
|
if( !dryRunFlag ){ |
|
478
|
dryRunFlag = find_option("explain", 0, 0)!=0; |
|
479
|
} |
|
480
|
db_must_be_within_tree(); |
|
481
|
verify_all_options(); |
|
482
|
db_begin_transaction(); |
|
483
|
undo_available = db_lget_int("undo_available", 0); |
|
484
|
if( dryRunFlag ){ |
|
485
|
if( undo_available==0 ){ |
|
486
|
fossil_print("No undo or redo is available\n"); |
|
487
|
}else{ |
|
488
|
Stmt q; |
|
489
|
int nChng = 0; |
|
490
|
const char *zArticle = undo_available==1 ? "An" : "A"; |
|
491
|
zCmd = undo_available==1 ? "undo" : "redo"; |
|
492
|
fossil_print("%s %s is available for the following command:\n\n" |
|
493
|
" %s %s\n\n", |
|
494
|
zArticle, zCmd, g.argv[0], db_lget("undo_cmdline", "???")); |
|
495
|
db_prepare(&q, |
|
496
|
"SELECT existsflag, pathname FROM undo ORDER BY pathname" |
|
497
|
); |
|
498
|
while( db_step(&q)==SQLITE_ROW ){ |
|
499
|
if( nChng==0 ){ |
|
500
|
fossil_print("The following file changes would occur if the " |
|
501
|
"command above is %sne:\n\n", zCmd); |
|
502
|
} |
|
503
|
nChng++; |
|
504
|
fossil_print("%s %s\n", |
|
505
|
db_column_int(&q,0) ? "UPDATE" : "DELETE", |
|
506
|
db_column_text(&q, 1) |
|
507
|
); |
|
508
|
} |
|
509
|
db_finalize(&q); |
|
510
|
if( nChng==0 ){ |
|
511
|
fossil_print("No file changes would occur with this undo/redo.\n"); |
|
512
|
} |
|
513
|
} |
|
514
|
}else{ |
|
515
|
int vid1 = db_lget_int("checkout", 0); |
|
516
|
int vid2; |
|
517
|
if( g.argc==2 ){ |
|
518
|
if( undo_available!=(1+isRedo) ){ |
|
519
|
fossil_fatal("nothing to %s", zCmd); |
|
520
|
} |
|
521
|
undo_all(isRedo); |
|
522
|
db_lset_int("undo_available", 2-isRedo); |
|
523
|
}else if( g.argc>=3 ){ |
|
524
|
int i; |
|
525
|
if( undo_available==0 ){ |
|
526
|
fossil_fatal("nothing to %s", zCmd); |
|
527
|
} |
|
528
|
for(i=2; i<g.argc; i++){ |
|
529
|
const char *zFile = g.argv[i]; |
|
530
|
Blob path; |
|
531
|
file_tree_name(zFile, &path, 0, 1); |
|
532
|
undo_one(blob_str(&path), isRedo); |
|
533
|
blob_reset(&path); |
|
534
|
} |
|
535
|
} |
|
536
|
vid2 = db_lget_int("checkout", 0); |
|
537
|
if( vid1!=vid2 ){ |
|
538
|
fossil_print("--------------------\n"); |
|
539
|
show_common_info(vid2, "updated-to:", 1, 0); |
|
540
|
} |
|
541
|
} |
|
542
|
db_end_transaction(0); |
|
543
|
} |
|
544
|
|