Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
| Comment: | Add symlink support to sqlar. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
4a0ed63daef97c4b3380aabc6578e305 |
| User & Date: | dan 2017-12-02 19:15:43 |
Context
|
2017-12-04
| ||
| 16:24 | Update README.md to describe how symbolic links are stored in an archive. check-in: ef2844a7e0 user: dan tags: trunk | |
|
2017-12-02
| ||
| 19:15 | Add symlink support to sqlar. check-in: 4a0ed63dae user: dan tags: trunk | |
|
2017-05-12
| ||
| 15:32 | Update the built-in SQLite to the first 3.19.0 beta. check-in: 84cb978770 user: drh tags: trunk | |
Changes
Changes to sqlar.c.
42 42 " -x Extract files from archive\n" 43 43 " -v Verbose output\n" 44 44 ); 45 45 exit(1); 46 46 } 47 47 48 48 /* 49 -** The database schema: 49 +** The database schema. Each file, directory or symlink in an archive 50 +** is represented by a single row in this table. 51 +** 52 +** name: Path to file-system entry (text). 53 +** mode: Value of stat.st_mode returned by stat() call (integer). 54 +** mtime: Value of stat.st_mtime returned by stat() call (integer). 55 +** sz: Size of file in bytes. Always 0 for a directory. -1 for symlink. 56 +** data: Blob containing file contents. NULL for a directory. Text value 57 +** containing linked path for a symlink. 50 58 */ 51 59 static const char zSchema[] = 52 60 "CREATE TABLE IF NOT EXISTS sqlar(\n" 53 61 " name TEXT PRIMARY KEY,\n" 54 62 " mode INT,\n" 55 63 " mtime INT,\n" 56 64 " sz INT,\n" ................................................................................ 405 413 FILE *out; 406 414 make_parent_directory(zFilename); 407 415 if( pCompr==0 ){ 408 416 rc = mkdir(zFilename, iMode); 409 417 if( rc ) errorMsg("cannot make directory: %s\n", zFilename); 410 418 return; 411 419 } 412 - out = fopen(zFilename, "wb"); 413 - if( out==0 ) errorMsg("cannot open for writing: %s\n", zFilename); 414 - if( sz==nCompr ){ 415 - if( sz>0 && fwrite(pCompr, sz, 1, out)!=1 ){ 416 - errorMsg("failed to write: %s\n", zFilename); 420 + if( sz<0 ){ 421 + /* This is a symlink. */ 422 + if( symlink(pCompr, zFilename)<0 ){ 423 + errorMsg("failed to create symlink: %s -> %s\n", zFilename, pCompr); 417 424 } 418 425 }else{ 419 - pOut = sqlite3_malloc( sz+1 ); 420 - if( pOut==0 ) errorMsg("cannot allocate %d bytes\n", sz+1); 421 - nOut = sz; 422 - rc = uncompress((Bytef*)pOut, &nOut, (const Bytef*)pCompr, nCompr); 423 - if( rc!=Z_OK ) errorMsg("uncompress failed for %s\n", zFilename); 424 - if( nOut>0 && fwrite(pOut, nOut, 1, out)!=1 ){ 425 - errorMsg("failed to write: %s\n", zFilename); 426 + out = fopen(zFilename, "wb"); 427 + if( out==0 ) errorMsg("cannot open for writing: %s\n", zFilename); 428 + if( sz==nCompr ){ 429 + if( sz>0 && fwrite(pCompr, sz, 1, out)!=1 ){ 430 + errorMsg("failed to write: %s\n", zFilename); 431 + } 432 + }else{ 433 + pOut = sqlite3_malloc( sz+1 ); 434 + if( pOut==0 ) errorMsg("cannot allocate %d bytes\n", sz+1); 435 + nOut = sz; 436 + rc = uncompress((Bytef*)pOut, &nOut, (const Bytef*)pCompr, nCompr); 437 + if( rc!=Z_OK ) errorMsg("uncompress failed for %s\n", zFilename); 438 + if( nOut>0 && fwrite(pOut, nOut, 1, out)!=1 ){ 439 + errorMsg("failed to write: %s\n", zFilename); 440 + } 441 + sqlite3_free(pOut); 426 442 } 427 - sqlite3_free(pOut); 443 + fclose(out); 444 + 445 + rc = chmod(zFilename, iMode&0777); 446 + if( rc ) errorMsg("cannot change mode to %03o: %s\n", iMode&0777,zFilename); 428 447 } 429 - fclose(out); 430 - rc = chmod(zFilename, iMode&0777); 431 - if( rc ) errorMsg("cannot change mode to %03o: %s\n", iMode, zFilename); 432 448 } 433 449 434 450 /* 435 451 ** Error out if there are any issues with the given filename 436 452 */ 437 453 static void check_filename(const char *z){ 438 454 if( strncmp(z, "../", 3)==0 || sqlite3_strglob("*/../*", z)==0 ){ 439 455 errorMsg("Filename with '..' in its path: %s\n", z); 440 456 } 441 457 if( sqlite3_strglob("*\\*", z)==0 ){ 442 458 errorMsg("Filename with '\\' in its name: %s\n", z); 443 459 } 444 460 } 461 + 462 +/* 463 +** File zSymlink is a symbolic link. Figure out the path that the link 464 +** points to and bind it (as text) to parameter iVar of statement pStmt. 465 +*/ 466 +static void bind_symlink_path( 467 + sqlite3_stmt *pStmt, /* Statement to bind to */ 468 + int iVar, /* Variable within pStmt to bind to */ 469 + const char *zSymlink, /* Path to symlink */ 470 + int verboseFlag /* If true, show file added */ 471 +){ 472 + char buf[4096]; 473 + int n = readlink(zSymlink, buf, sizeof(buf)); 474 + if( n<0 ){ 475 + errorMsg("readlink(%s) failed\n", zSymlink); 476 + } 477 + if( n>sizeof(buf) ){ 478 + errorMsg("symlinked path is too long (max %d bytes)\n", sizeof(buf)); 479 + } 480 + 481 + sqlite3_bind_text(pStmt, iVar, buf, n, SQLITE_TRANSIENT); 482 + if( verboseFlag ) printf(" added: %s -> %.*s\n", zSymlink, n, buf); 483 +} 445 484 446 485 /* 447 486 ** Add a file to the database. 448 487 */ 449 488 static void add_file( 450 489 const char *zFilename, /* Name of file to add */ 451 490 int verboseFlag, /* If true, show each file added */ ................................................................................ 454 493 int rc; 455 494 struct stat x; 456 495 int szOrig; 457 496 int szCompr; 458 497 const char *zName; 459 498 460 499 check_filename(zFilename); 461 - rc = stat(zFilename, &x); 500 + rc = lstat(zFilename, &x); 462 501 if( rc ) errorMsg("no such file or directory: %s\n", zFilename); 463 502 if( x.st_size>1000000000 ){ 464 503 errorMsg("file too big: %s\n", zFilename); 465 504 } 466 505 if( pStmt==0 ){ 467 506 db_prepare("REPLACE INTO sqlar(name,mode,mtime,sz,data)" 468 507 " VALUES(?1,?2,?3,?4,?5)"); 469 508 } 470 509 zName = zFilename; 471 510 while( zName[0]=='/' ) zName++; 472 511 sqlite3_bind_text(pStmt, 1, zName, -1, SQLITE_STATIC); 473 512 sqlite3_bind_int(pStmt, 2, x.st_mode); 474 513 sqlite3_bind_int64(pStmt, 3, x.st_mtime); 475 - if( S_ISREG(x.st_mode) ){ 514 + if( S_ISLNK(x.st_mode) ){ 515 + sqlite3_bind_int(pStmt, 4, -1); 516 + bind_symlink_path(pStmt, 5, zFilename, verboseFlag); 517 + }else if( S_ISREG(x.st_mode) ){ 476 518 char *zContent = read_file(zFilename, &szOrig, &szCompr, noCompress); 477 519 sqlite3_bind_int(pStmt, 4, szOrig); 478 520 sqlite3_bind_blob(pStmt, 5, zContent, szCompr, sqlite3_free); 479 521 if( verboseFlag ){ 480 522 if( szCompr<szOrig ){ 481 523 int pct = szOrig ? (100*(sqlite3_int64)szCompr)/szOrig : 0; 482 524 printf(" added: %s (deflate %d%%)\n", zFilename, 100-pct); ................................................................................ 586 628 }else if( extractFlag ){ 587 629 const char *zSql; 588 630 db_open(zArchive, 0, seeFlag, azFiles, nFiles); 589 631 zSql = "SELECT name, mode, mtime, sz, data FROM sqlar" 590 632 " WHERE name_on_list(name)"; 591 633 db_prepare(zSql); 592 634 while( sqlite3_step(pStmt)==SQLITE_ROW ){ 635 + int sz = sqlite3_column_int(pStmt, 3); /* Size of file on disk */ 636 + const char *pData; /* Data for this file */ 593 637 const char *zFN = (const char*)sqlite3_column_text(pStmt, 0); 594 638 check_filename(zFN); 595 639 if( zFN[0]=='/' ){ 596 640 errorMsg("absolute pathname: %s\n", zFN); 597 641 } 598 642 if( sqlite3_column_type(pStmt,4)==SQLITE_BLOB && access(zFN, F_OK)==0 ){ 599 643 errorMsg("file already exists: %s\n", zFN); 600 644 } 601 645 if( verboseFlag ) printf("%s\n", zFN); 646 + if( sz<0 ){ 647 + /* symlink */ 648 + pData = (const char*)sqlite3_column_text(pStmt, 4); 649 + }else{ 650 + pData = (const char*)sqlite3_column_blob(pStmt,4); 651 + if( pData==0 && sqlite3_column_type(pStmt, 4)!=SQLITE_NULL ){ 652 + /* If the file is zero bytes in size, then column "data" will 653 + ** contain a zero-byte blob value. In this case, column_blob() 654 + ** returns NULL, which confuses the write_file() call into 655 + ** thinking this is a directory, not a zero-byte file. */ 656 + pData = ""; 657 + } 658 + } 602 659 write_file(zFN, sqlite3_column_int(pStmt,1), 603 660 sqlite3_column_int64(pStmt,2), 604 - sqlite3_column_int(pStmt,3), 605 - sqlite3_column_blob(pStmt,4), 661 + sz, pData, 606 662 sqlite3_column_bytes(pStmt,4)); 607 663 } 608 664 db_close(1); 609 665 }else{ 610 666 if( azFiles==0 ){ 611 667 errorMsg("Specify one or more files to add on the command-line"); 612 668 }
Changes to sqlarfs.c.
132 132 sqlite3_bind_text(g.pExists, 1, &path[1], -1, SQLITE_STATIC); 133 133 rc = sqlite3_step(g.pExists); 134 134 sqlite3_reset(g.pExists); 135 135 if( rc==SQLITE_DONE ) return -ENOENT; 136 136 return 0; 137 137 } 138 138 139 +static int prepare_read_stmt(void){ 140 + int rc = SQLITE_OK; 141 + if( g.pRead==0 ){ 142 + rc = sqlite3_prepare_v2(g.db, 143 + "SELECT sz, data FROM sqlar WHERE name=?1", 144 + -1, &g.pRead, 0); 145 + } 146 + return rc; 147 +} 139 148 140 149 /* 141 150 ** Load the file named path[] into the cache, if it is not there already. 142 151 ** 143 152 ** Return 0 on success. Return an error code if the file could not be loaded. 144 153 */ 145 154 static int loadCache(const char *path){ 146 155 unsigned long int nIn; 147 156 const char *zIn; 148 - int rc; 157 + int rc = 0; 149 158 if( g.zCacheName ){ 150 159 if( strcmp(path, g.zCacheName)==0 ) return 0; 151 160 sqlite3_free(g.zCacheName); g.zCacheName = 0; 152 161 sqlite3_free(g.zCacheData); g.zCacheData = 0; 153 162 } 154 - if( g.pRead==0 ){ 155 - rc = sqlite3_prepare_v2(g.db, 156 - "SELECT sz, data FROM sqlar WHERE name=?1", 157 - -1, &g.pRead, 0); 158 - if( rc!=SQLITE_OK ){ 159 - return -EIO; 160 - } 163 + if( prepare_read_stmt() ){ 164 + return -EIO; 161 165 } 162 166 sqlite3_bind_text(g.pRead, 1, path, -1, SQLITE_STATIC); 163 167 if( sqlite3_step(g.pRead)==SQLITE_ROW ){ 164 168 g.szCache = sqlite3_column_int64(g.pRead, 0); 165 169 zIn = (const char*)sqlite3_column_blob(g.pRead, 1); 166 170 nIn = (unsigned long int)sqlite3_column_bytes(g.pRead, 1); 167 - g.zCacheData = sqlite3_malloc( g.szCache ); 171 + g.zCacheData = sqlite3_malloc( g.szCache+1 ); 168 172 if( g.zCacheData==0 ){ 169 173 rc = -EIO; 170 - }else{ 174 + }else if( g.szCache!=nIn ){ 171 175 rc = uncompress((Bytef*)g.zCacheData, &g.szCache, (const Bytef*)zIn, nIn); 172 176 if( rc!=Z_OK ){ 173 177 sqlite3_free(g.zCacheData); 174 178 g.zCacheData = 0; 175 179 rc = -EIO; 176 180 } 181 + }else{ 182 + memcpy(g.zCacheData, zIn, nIn); 177 183 } 178 184 if( g.zCacheData ){ 179 185 g.zCacheName = sqlite3_mprintf("%s", path); 180 186 if( g.zCacheName==0 ){ 181 187 rc = -EIO; 182 188 sqlite3_free(g.zCacheData); 183 189 g.zCacheData = 0; ................................................................................ 208 214 if( offset+size>g.szCache ) size = g.szCache - offset; 209 215 memcpy(buf, g.zCacheData + offset, size); 210 216 return size; 211 217 }else{ 212 218 return rc; 213 219 } 214 220 } 221 + 222 +static int sqlarfs_readlink(const char *zSymlink, char *pBuf, size_t nBuf){ 223 + int rc = 0; 224 + if( prepare_read_stmt() ){ 225 + rc = -EIO; 226 + }else{ 227 + sqlite3_bind_text(g.pRead, 1, &zSymlink[1], -1, SQLITE_STATIC); 228 + if( sqlite3_step(g.pRead)==SQLITE_ROW ){ 229 + int n = sqlite3_column_bytes(g.pRead, 1); 230 + if( n<nBuf ){ 231 + memcpy(pBuf, sqlite3_column_text(g.pRead, 1), n); 232 + pBuf[n] = '\0'; 233 + }else{ 234 + rc = -ENAMETOOLONG; 235 + } 236 + }else{ 237 + rc = -ENOENT; 238 + } 239 + sqlite3_reset(g.pRead); 240 + } 241 + return rc; 242 +} 215 243 216 244 static struct fuse_operations sqlarfs_methods = { 217 - .getattr = sqlarfs_getattr, 218 - .readdir = sqlarfs_readdir, 219 - .open = sqlarfs_open, 220 - .read = sqlarfs_read, 245 + .getattr = sqlarfs_getattr, 246 + .readdir = sqlarfs_readdir, 247 + .open = sqlarfs_open, 248 + .read = sqlarfs_read, 249 + .readlink = sqlarfs_readlink, 221 250 }; 222 251 223 252 /* 224 253 ** Show a help message and quit. 225 254 */ 226 255 static void showHelp(const char *argv0){ 227 256 fprintf(stderr, "Usage: %s [options] archive mount-point\n", argv0);