4.3BSD - /usr/src/new/rcs/src/co.c

   1: /*
   2:  *                     RCS checkout operation
   3:  */
   4:  static char rcsid[]=
   5:  "$Header: /usr/wft/RCS/SRC/RCS/co.c,v 3.7 83/02/15 15:27:07 wft Exp $ Purdue CS";
   6: /*****************************************************************************
   7:  *                       check out revisions from RCS files
   8:  *****************************************************************************
   9:  *
  10:  * Copyright (C) 1982 by Walter F. Tichy
  11:  *                       Purdue University
  12:  *                       Computer Science Department
  13:  *                       West Lafayette, IN 47907
  14:  *
  15:  * All rights reserved. No part of this software may be sold or distributed
  16:  * in any form or by any means without the prior written permission of the
  17:  * author.
  18:  * Report problems and direct all inquiries to Tichy@purdue (ARPA net).
  19:  */
  20: 
  21: 
  22: /* $Log:	co.c,v $
  23:  * Revision 3.7  83/02/15  15:27:07  wft
  24:  * Added call to fastcopy() to copy remainder of RCS file.
  25:  *
  26:  * Revision 3.6  83/01/15  14:37:50  wft
  27:  * Added ignoring of interrupts while RCS file is renamed; this avoids
  28:  * deletion of RCS files during the unlink/link window.
  29:  *
  30:  * Revision 3.5  82/12/08  21:40:11  wft
  31:  * changed processing of -d to use DATEFORM; removed actual from
  32:  * call to preparejoin; re-fixed printing of done at the end.
  33:  *
  34:  * Revision 3.4  82/12/04  18:40:00  wft
  35:  * Replaced getdelta() with gettree(), SNOOPDIR with SNOOPFILE.
  36:  * Fixed printing of "done".
  37:  *
  38:  * Revision 3.3  82/11/28  22:23:11  wft
  39:  * Replaced getlogin() with getpwuid(), flcose() with ffclose(),
  40:  * %02d with %.2d, mode generation for working file with WORKMODE.
  41:  * Fixed nil printing. Fixed -j combined with -l and -p, and exit
  42:  * for non-existing revisions in preparejoin().
  43:  *
  44:  * Revision 3.2  82/10/18  20:47:21  wft
  45:  * Mode of working file is now maintained even for co -l, but write permission
  46:  * is removed.
  47:  * The working file inherits its mode from the RCS file, plus write permission
  48:  * for the owner. The write permission is not given if locking is strict and
  49:  * co does not lock.
  50:  * An existing working file without write permission is deleted automatically.
  51:  * Otherwise, co asks (empty answer: abort co).
  52:  * Call to getfullRCSname() added, check for write error added, call
  53:  * for getlogin() fixed.
  54:  *
  55:  * Revision 3.1  82/10/13  16:01:30  wft
  56:  * fixed type of variables receiving from getc() (char -> int).
  57:  * removed unused variables.
  58:  */
  59: 
  60: 
  61: 
  62: 
  63: #include <pwd.h>
  64: #include "rcsbase.h"
  65: #include "time.h"
  66: #include <sys/types.h>
  67: #include <sys/stat.h>
  68: 
  69: static char rcsbaseid[] = RCSBASE;
  70: 
  71: extern FILE * fopen();
  72: extern int    rename();
  73: extern struct passwd *getpwuid();
  74: extern char * malloc();
  75: extern struct hshentry * genrevs(); /*generate delta numbers                */
  76: extern int  nextc;                  /*next input character                  */
  77: extern int  nerror;                 /*counter for errors                    */
  78: extern char * Kdesc;                /*keyword for description               */
  79: extern char * maketempfile();       /*temporary file name                   */
  80: extern char * buildrevision();      /*constructs desired revision           */
  81: extern int    buildjoin();          /*join several revisions                */
  82: extern char * mktempfile();         /*temporary file name generator         */
  83: extern struct lock * addlock();     /*add a new lock                        */
  84: extern long   maketime();           /*convert parsed time to unix time.     */
  85: extern struct tm * localtime();     /*convert unixtime into a tm-structure  */
  86: extern int StrictLocks;
  87: extern FILE * finptr;               /* RCS input file                       */
  88: extern FILE * frewrite;             /* new RCS file                         */
  89: 
  90: char * RCSfilename, * workfilename;
  91: char * newRCSfilename, * neworkfilename;
  92: int    rewriteflag; /* indicates whether input should be echoed to frewrite */
  93: 
  94: char * date, * rev, * state, * author, * join;
  95: char finaldate[datelength];
  96: 
  97: int lockflag, tostdout;
  98: char * caller;                        /* caller's login;                    */
  99: extern quietflag;
 100: 
 101: char numericrev[revlength];           /* holds expanded revision number     */
 102: struct hshentry * gendeltas[hshsize]; /* stores deltas to be generated      */
 103: struct hshentry * targetdelta;        /* final delta to be generated        */
 104: 
 105: char * joinlist[joinlength];          /* pointers to revisions to be joined */
 106: int lastjoin;                         /* index of last element in joinlist  */
 107: 
 108: main (argc, argv)
 109: int argc;
 110: char * argv[];
 111: {
 112:         register c;
 113:         char * cmdusage;
 114:         struct stat RCSstat;
 115:         struct tm parseddate, *ftm;
 116:         char * rawdate;
 117:         long unixtime;
 118: 
 119:     catchints();
 120:         cmdid = "co";
 121:         cmdusage = "command format:\nco -l[rev] -p[rev] -q[rev] -r[rev] -ddate -sstate -w[login] -jjoinlist file ...";
 122:         date = rev = state = author = join = nil;
 123:         lockflag = tostdout = quietflag = false;
 124:         caller=getpwuid(getuid())->pw_name;
 125: 
 126:         while (--argc,++argv, argc>=1 && ((*argv)[0] == '-')) {
 127:                 switch ((*argv)[1]) {
 128: 
 129:                 case 'l':
 130:                         lockflag=true;
 131:                 case 'r':
 132:                 revno:  if ((*argv)[2]!='\0') {
 133:                                 if (rev!=nil) warn("Redefinition of revision number");
 134:                                 rev = (*argv)+2;
 135:                         }
 136:                         break;
 137: 
 138:                 case 'p':
 139:                         tostdout=true;
 140:                         goto revno;
 141: 
 142:                 case 'q':
 143:                         quietflag=true;
 144:                         goto revno;
 145: 
 146:                 case 'd':
 147:                         if ((*argv)[2]!='\0') {
 148:                                 if (date!=nil) warn("Redefinition of -d option");
 149:                                 rawdate=(*argv)+2;
 150:                         }
 151:                         /* process date/time */
 152:                         if (partime(rawdate,&parseddate)==0)
 153:                                 faterror("Can't parse date/time: %s",rawdate);
 154:                         if ((unixtime=maketime(&parseddate))== 0L)
 155:                                 faterror("Inconsistent date/time: %s",rawdate);
 156:                         ftm=localtime(&unixtime);
 157:                         sprintf(finaldate,DATEFORM,
 158:                         ftm->tm_year,ftm->tm_mon+1,ftm->tm_mday,ftm->tm_hour,ftm->tm_min,ftm->tm_sec);
 159:                         date=finaldate;
 160:                         break;
 161: 
 162:                 case 'j':
 163:                         if ((*argv)[2]!='\0'){
 164:                                 if (join!=nil)warn("Redefinition of -j option");
 165:                                 join = (*argv)+2;
 166:                         }
 167:                         break;
 168: 
 169:                 case 's':
 170:                         if ((*argv)[2]!='\0'){
 171:                                 if (state!=nil)warn("Redefinition of -s option");
 172:                                 state = (*argv)+2;
 173:                         }
 174:                         break;
 175: 
 176:                 case 'w':
 177:                         if (author!=nil)warn("Redefinition of -w option");
 178:                         if ((*argv)[2]!='\0')
 179:                                 author = (*argv)+2;
 180:                         else    author = caller;
 181:                         break;
 182: 
 183:                 default:
 184:                         faterror("unknown option: %s\n%s", *argv,cmdusage);
 185: 
 186:                 };
 187:         } /* end of option processing */
 188: 
 189:         if (argc<1) faterror("No input file\n%s",cmdusage);
 190: 
 191:         /* now handle all filenames */
 192:         do {
 193:         rewriteflag=false;
 194:         finptr=frewrite=NULL;
 195:         neworkfilename=nil;
 196: 
 197:         if (!pairfilenames(argc,argv,true,tostdout)) continue;
 198: 
 199:         /* now RCSfilename contains the name of the RCS file, and finptr
 200:          * the file descriptor. If tostdout is false, workfilename contains
 201:          * the name of the working file, otherwise undefined (not nil!).
 202:          */
 203:         diagnose("%s  -->  %s", RCSfilename,tostdout?"stdout":workfilename);
 204: 
 205:         fstat(fileno(finptr),&RCSstat); /* get file status, esp. the mode  */
 206: 
 207:         if (!tostdout && !trydiraccess(workfilename)) continue; /* give up */
 208:         if (lockflag && !checkaccesslist(caller)) continue;     /* give up */
 209:         if (!trysema(RCSfilename,lockflag)) continue;           /* give up */
 210: 
 211: 
 212:         gettree();  /* reads in the delta tree */
 213: 
 214:         if (Head==nil) {
 215:                 /* no revisions; create empty file */
 216:                 diagnose("no revisions present; generating empty revision 0.0");
 217:                 if (!tostdout)
 218:                         if (!creatempty(workfilename)) continue;
 219:                 else    putchar('\0'); /* end of file */
 220:                 /* Can't reserve a delta, so don't call addlock */
 221:         } else {
 222:                 /* expand symbolic revision number */
 223:                 if (!expandsym(rev,numericrev))
 224:                         continue;
 225:                 /* get numbers of deltas to be generated */
 226:                 if (!(targetdelta=genrevs(numericrev,date,author,state,gendeltas)))
 227:                         continue;
 228:                 /* check reservations */
 229:                 if (lockflag && !addlock(targetdelta,caller))
 230:                         continue;
 231: 
 232:                 if (join && !preparejoin()) continue;
 233: 
 234:                 diagnose("revision %s %s",targetdelta->num,
 235:                          lockflag?"(locked)":"");
 236: 
 237:                 /* remove old working file if necessary */
 238:                 if (!tostdout)
 239:                         if (!rmoldfile(workfilename)) continue;
 240: 
 241:                 /* prepare for rewriting the RCS file */
 242:                 if (lockflag) {
 243:                         newRCSfilename=mktempfile(RCSfilename,NEWRCSFILE);
 244:                         if ((frewrite=fopen(newRCSfilename, "w"))==NULL) {
 245:                                 error("Can't open file %s",newRCSfilename);
 246:                                 continue;
 247:                         }
 248:                         putadmin(frewrite);
 249:                         puttree(Head,frewrite);
 250:                         fprintf(frewrite, "\n\n%s%c",Kdesc,nextc);
 251:                         rewriteflag=true;
 252:                 }
 253: 
 254:                 /* skip description */
 255:                 getdesc(false); /* don't echo*/
 256: 
 257:                 if (!(neworkfilename=buildrevision(gendeltas,targetdelta,
 258:                       tostdout?(join!=nil?"/tmp/":nil):workfilename,true)))
 259:                                 continue;
 260: 
 261:                 if (lockflag&&nerror==0) {
 262:                         /* rewrite the rest of the RCSfile */
 263:                         fastcopy(finptr,frewrite);
 264:                         ffclose(frewrite); frewrite=NULL;
 265:             ignoreints();
 266:                         if (rename(newRCSfilename,RCSfilename)<0) {
 267:                                 error("Can't rewrite %s; saved in: %s",
 268:                                 RCSfilename, newRCSfilename);
 269:                                 newRCSfilename[0]='\0'; /* avoid deletion*/
 270:                 catchints();
 271:                                 break;
 272:                         }
 273:                         newRCSfilename[0]='\0'; /* avoid re-deletion by cleanup()*/
 274:                         if (chmod(RCSfilename,RCSstat.st_mode & ~0222)<0)
 275:                             warn("Can't preserve mode of %s",RCSfilename);
 276:             catchints();
 277:                 }
 278: 
 279: #               ifdef SNOOPFILE
 280:                 logcommand("co",targetdelta,gendeltas,caller);
 281: #               endif
 282: 
 283:                 if (join) {
 284:                         rmsema(); /* kill semaphore file so other co's can proceed */
 285:                         if (!buildjoin(neworkfilename,tostdout)) continue;
 286:                 }
 287:                 if (!tostdout) {
 288:                         if (link(neworkfilename,workfilename) <0) {
 289:                                 error("Can't create %s; see %s",workfilename,neworkfilename);
 290:                                 neworkfilename[0]= '\0'; /*avoid deletion*/
 291:                                 continue;
 292:                         }
 293:         }
 294:         }
 295:         if (!tostdout)
 296:             if (chmod(workfilename, WORKMODE(RCSstat.st_mode))<0)
 297:                 warn("Can't adjust mode of %s",workfilename);
 298: 
 299:         if (!tostdout) diagnose("done");
 300:         } while (cleanup(),
 301:                  ++argv, --argc >=1);
 302: 
 303:         exit(nerror!=0);
 304: 
 305: }       /* end of main (co) */
 306: 
 307: 
 308: /*****************************************************************
 309:  * The following routines are auxiliary routines
 310:  *****************************************************************/
 311: 
 312: int rmoldfile(ofile)
 313: char * ofile;
 314: /* Function: unlinks ofile, if it exists, under the following conditions:
 315:  * If the file is read-only, file is unlinked.
 316:  * Otherwise (file writable):
 317:  *   if !quietmode asks the user whether to really delete it (default: fail);
 318:  *   otherwise failure.
 319:  * Returns false on failure to unlink, true otherwise.
 320:  */
 321: {
 322:         int response, c;    /* holds user response to queries */
 323:         struct stat buf;
 324: 
 325:         if (stat (ofile, &buf) < 0)         /* File doesn't exist */
 326:             return (true);                  /* No problem         */
 327: 
 328:         if (buf.st_mode & 0222) {            /* File is writable */
 329:             if (!quietflag) {
 330:                 fprintf(stderr,"writable %s exists; overwrite? [ny](n): ",ofile);
 331:                 /* must be stderr in case of IO redirect */
 332:                 c=response=getchar();
 333:                 while (!(c==EOF || c=='\n')) c=getchar(); /*skip rest*/
 334:         if (c == EOF)
 335:             clearerr(stdin);
 336:                 if (!(response=='y'||response=='Y')) {
 337:                         warn("checkout aborted.");
 338:                         return false;
 339:                 }
 340:             } else {
 341:                 error("writable %s exists; checkout aborted.",ofile);
 342:                 return false;
 343:             }
 344:         }
 345:         /* now unlink: either not writable, or permission given */
 346:         if (unlink(ofile) != 0) {            /* Remove failed   */
 347:             error("Can't unlink %s",ofile);
 348:             return false;
 349:         }
 350:         return true;
 351: }
 352: 
 353: 
 354: creatempty(file)
 355: char * file;
 356: /* Function: creates an empty file named file.
 357:  * Removes an existing file with the same name with rmoldfile().
 358:  */
 359: {
 360:         int  fdesc;              /* file descriptor */
 361: 
 362:         if (!rmoldfile(file)) return false;
 363:         fdesc=creat(file,0666);
 364:         if (fdesc < 0) {
 365:                 faterror("Cannot create %s",file);
 366:                 return false;
 367:         } else {
 368:                 close(fdesc); /* empty file */
 369:                 return true;
 370:         }
 371: }
 372: 
 373: 
 374: 
 375: /*****************************************************************
 376:  * The rest of the routines are for handling joins
 377:  *****************************************************************/
 378: 
 379: char * getrev(sp, tp, buffsize)
 380: register char * sp, *tp; int buffsize;
 381: /* Function: copies a symbolic revision number from sp to tp,
 382:  * appends a '\0', and returns a pointer to the character following
 383:  * the revision number; returns nil if the revision number is more than
 384:  * buffsize characters long.
 385:  * The revision number is terminated by space, tab, comma, colon,
 386:  * semicolon, newline, or '\0'.
 387:  * used for parsing the -j option.
 388:  */
 389: {
 390:         register char c;
 391:         register int length;
 392: 
 393:         length = 0;
 394:         while (((c= *sp)!=' ')&&(c!='\t')&&(c!='\n')&&(c!=':')&&(c!=',')
 395:                 &&(c!=';')&&(c!='\0')) {
 396:                 if (length>=buffsize) return false;
 397:                 *tp++= *sp++;
 398:                 length++;
 399:         }
 400:         *tp= '\0';
 401:         return sp;
 402: }
 403: 
 404: 
 405: 
 406: int preparejoin()
 407: /* Function: Parses a join list pointed to by join and places pointers to the
 408:  * revision numbers into joinlist.
 409:  */
 410: {
 411:         struct hshentry * (* joindeltas)[];
 412:         struct hshentry * tmpdelta;
 413:         register char * j;
 414:         char symbolrev[revlength],numrev[revlength];
 415: 
 416:         joindeltas = (struct hshentry * (*)[])malloc(hshsize*sizeof(struct hshentry *));
 417:         j=join;
 418:         lastjoin= -1;
 419:         for (;;) {
 420:                 while ((*j==' ')||(*j=='\t')||(*j==',')) j++;
 421:                 if (*j=='\0') break;
 422:                 if (lastjoin>=joinlength-2) {
 423:                         error("too many joins");
 424:                         return(false);
 425:                 }
 426:                 if(!(j=getrev(j,symbolrev,revlength))) return false;
 427:                 if (!expandsym(symbolrev,numrev)) return false;
 428:                 tmpdelta=genrevs(numrev,nil,nil,nil,joindeltas);
 429:                 if (tmpdelta==nil)
 430:                         return false;
 431:                 else    joinlist[++lastjoin]=tmpdelta->num;
 432:                 while ((*j==' ') || (*j=='\t')) j++;
 433:                 if (*j == ':') {
 434:                         j++;
 435:                         while((*j==' ') || (*j=='\t')) j++;
 436:                         if (*j!='\0') {
 437:                                 if(!(j=getrev(j,symbolrev,revlength))) return false;
 438:                                 if (!expandsym(symbolrev,numrev)) return false;
 439:                                 tmpdelta=genrevs(numrev,nil,nil,nil,joindeltas);
 440:                                 if (tmpdelta==nil)
 441:                                         return false;
 442:                                 else    joinlist[++lastjoin]=tmpdelta->num;
 443:                         } else {
 444:                                 error("join pair incomplete");
 445:                                 return false;
 446:                         }
 447:                 } else {
 448:                         if (lastjoin==0) { /* first pair */
 449:                                 /* common ancestor missing */
 450:                                 joinlist[1]=joinlist[0];
 451:                                 lastjoin=1;
 452:                                 /*derive common ancestor*/
 453:                                 joinlist[0]=malloc(revlength);
 454:                                 if (!getancestor(targetdelta->num,joinlist[1],joinlist[0]))
 455:                                        return false;
 456:                         } else {
 457:                                 error("join pair incomplete");
 458:                                 return false;
 459:                         }
 460:                 }
 461:         }
 462:         if (lastjoin<1) {
 463:                 error("empty join");
 464:                 return false;
 465:         } else  return true;
 466: }
 467: 
 468: 
 469: 
 470: buildjoin(initialfile, tostdout)
 471: char * initialfile; int tostdout;
 472: /* Function: merge pairs of elements in joinlist into initialfile
 473:  * If tostdout==true, copy result to stdout.
 474:  * All unlinking of initialfile, rev2, and rev3 should be done by cleanup().
 475:  */
 476: {       char command[NCPPN+80];
 477:         char subs[revlength];
 478:         char * rev2, * rev3;
 479:         int i;
 480: 
 481:         rev2=mktempfile("/tmp/",JOINFIL2);
 482:         rev3=mktempfile("/tmp/",JOINFIL3);
 483: 
 484:         i=0;
 485:         while (i<lastjoin) {
 486:                 /*prepare marker for merge*/
 487:                 if (i==0)
 488:                         strcpy(subs,targetdelta->num);
 489:                 else    sprintf(subs, "merge%d",i/2);
 490:                 diagnose("revision %s",joinlist[i]);
 491:                 sprintf(command,"%s/co -p%s -q  %s > %s\n",TARGETDIR,joinlist[i],RCSfilename,rev2);
 492:                 if (system(command)) {
 493:                         nerror++;return false;
 494:                 }
 495:                 diagnose("revision %s",joinlist[i+1]);
 496:                 sprintf(command,"%s/co -p%s -q  %s > %s\n",TARGETDIR,joinlist[i+1],RCSfilename,rev3);
 497:                 if (system(command)) {
 498:                         nerror++; return false;
 499:                 }
 500:                 diagnose("merging...");
 501:                 sprintf(command,"%s %s%s %s %s %s %s\n", MERGE,
 502:                         ((i+2)>=lastjoin && tostdout)?"-p ":"",
 503:                         initialfile,rev2,rev3,subs,joinlist[i+1]);
 504:                 if (system(command)) {
 505:                         nerror++; return false;
 506:                 }
 507:                 i=i+2;
 508:         }
 509:         return true;
 510: }

Defined functions

Defined variables