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📁 早期freebsd实现
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3621(Instead,)S3966(create)S4235(a)S4311(branch)S4614(at)S4718(revision)S4142 V970(1.3,)S1155(and)S1334(check)S1601(in)S1714(the)S1871(\256x)S2012(on)S2147(that)S2332(branch.)S2692(The)S2881(\256rst)S3071(branch)S3376(starting)S3710(at)S3816(1.3)S3975(has)S4142(number)S4481(1.3.1,)S4740(and)S4918(the)S4322 V970(revisions)S1374(on)S1517(that)S1710(branch)S2024(are)S2188(numbered)S2630(1.3.1.1,)S2974(1.3.1.2,)S3318(etc.)S3533(The)S3732(double)S4048(numbering)S4525(is)S4636(needed)S4962(to)S4502 V970(allow)S1235(for)S1394(another)S1736(branch)S2050(at)S2165(1.3,)S2358(say)S2534(1.3.2.)S2832(Revisions)S3270(on)S3413(the)S3578(second)S3898(branch)S4212(would)S4505(be)S4641(numbered)S4682 V970(1.3.2.1,)S1300(1.3.2.2,)S1630(and)S1804(so)S1923(on.)S2108(The)S2293(following)S2712(steps)S2942(create)S3209(branch)S3510(1.3.1)S3740(and)S3914(add)S4088(revision)S4440(1.3.1.1:)S4862 V10 I1270(co)S1424(\261r1.3)S1698(f.c)S2028(\320)S2147(check)S2403(out)S2561(revision)S2913(1.3)S4982 V1270(edit)S1480(f.c)S2028(\320)S2147(change)S2465(it)S5102 V1270(ci)S1402(\261r1.3.1)S1751(f.c)S2028(\320)S2147(check)S2403(it)S2489(in)S2597(on)S2727(branch)S3040(1.3.1)S5342 V10 R970(This)S1184(sequence)S1585(of)S1704(commands)S2173(transforms)S2636(the)S2794(tree)S2979(of)S3098(Figure)S3395(2)S3481(into)S3673(the)S3831(one)S4011(in)S4126(Figure)S4424(3.)S4566(Note)S4797(that)S4984(it)S5522 V970(may)S1179(be)S1310(necessary)S1734(to)S1849(incorporate)S2340(the)S2499(di)S2577 H	(f)show 10 -.5 mul h (f)show10 R2638(erences)S2973(between)S3342(1.3)S3504(and)S3685(1.3.1.1)S3997(into)S4189(a)S4269(revision)S4627(at)S4735(level)S4965(2.)S5702 V970(The)S1155(operation)S10 I1562(rcsmerge)S10 R1963(automates)S2398(this)S2573(process)S2902(\(see)S3092(the)S3244(Appendix\).)S6013 V8 R2532(1.1)S6112 V2410 H2410 5882 lc2410 5882 mc2410 H2755 5882 lc2755 5882 mc2755 H2755 6112 lc2755 6112 mc2755 H2410 6112 lc2410 6112 mc5997 V2755 H2985 5997 lc2985 5997 mc6008 V2939 H2985 5997 lc2985 5997 mc5985 V2939 H2985 5996 lc2985 5996 mc6013 V3108(1.2)S6112 V2986 H2986 5882 lc2986 5882 mc2986 H3331 5882 lc3331 5882 mc3331 H3331 6112 lc3331 6112 mc3331 H2986 6112 lc2986 6112 mc5997 V3331 H3561 5997 lc3561 5997 mc6008 V3515 H3561 5997 lc3561 5997 mc5985 V3515 H3561 5996 lc3561 5996 mc6013 V3684(1.3)S6112 V3562 H3562 5882 lc3562 5882 mc3562 H3907 5882 lc3907 5882 mc3907 H3907 6112 lc3907 6112 mc3907 H3562 6112 lc3562 6112 mc5997 V3907 H4137 5997 lc4137 5997 mc6008 V4091 H4137 5997 lc4137 5997 mc5985 V4091 H4137 5996 lc4137 5996 mc6013 V4260(2.1)S6112 V4138 H4138 5882 lc4138 5882 mc4138 H4483 5882 lc4483 5882 mc4483 H4483 6112 lc4483 6112 mc4483 H4138 6112 lc4138 6112 mc5997 V4483 H4713 5997 lc4713 5997 mc6008 V4667 H4713 5997 lc4713 5997 mc5985 V4667 H4713 5996 lc4713 5996 mc6013 V4836(2.2)S6112 V4714 H4714 5882 lc4714 5882 mc4714 H5059 5882 lc5059 5882 mc5059 H5059 6112 lc5059 6112 mc5059 H4714 6112 lc4714 6112 mc5997 V5059 H5082 5997 lc5082 5997 mc5111 H5134 5997 lc5134 5997 mc5163 H5186 5997 lc5186 5997 mc5215 H5238 5997 lc5238 5997 mc5266 H5289 5997 lc5289 5997 mc6008 V5243 H5289 5997 lc5289 5997 mc5985 V5243 H5289 5996 lc5289 5996 mc6474 V4200(1.3.1.1)S6573 V4138 H4138 6343 lc4138 6343 mc6342 V4138 H4483 6342 lc4483 6342 mc4483 H4483 6572 lc4483 6572 mc6573 V4483 H4138 6573 lc4138 6573 mc6458 V4483 H4506 6458 lc4506 6458 mc4535 H4558 6458 lc4558 6458 mc4587 H4610 6458 lc4610 6458 mc4639 H4662 6458 lc4662 6458 mc4690 H4713 6458 lc4713 6458 mc6469 V4667 H4713 6458 lc4713 6458 mc6446 V4667 H4713 6457 lc4713 6457 mc6112 V3734 H4137 6457 lc4137 6457 mc6436 V4095 H4137 6457 lc4137 6457 mc6419 V4110 H4137 6457 lc4137 6457 mc6753 V10 R2053(Figure)S2344(3.)S2479(A)S2581(revision)S2933(tree)S3112(with)S3320(one)S3494(side)S3685(branch)S7149 V10 I720(Distributed)S1206(development)S1740(and)S1920(customer)S2316(modifications)S7329 V10 R970(Assume)S1337(a)S1426(situation)S1816(as)S1944(in)S2067(Figure)S2373(2,)S2493(where)S2781(revision)S3148(1.3)S3319(is)S3432(in)S3556(operation)S3979(at)S4097(several)S4425(customer)S4837(sites,)S7920 VEP%%Page: 6 7BP/slant 0 def/height 1.000000 def10 R10 R40 V0(-)S580 V2792(- 6 -)S900 V970(while)S1223(release)S1530(2)S1611(is)S1709(in)S1818(development.)S2420(Customer)S2840(sites)S3049(should)S3347(use)S3510(RCS)S3730(to)S3838(store)S4062(the)S4214(distributed)S4672(software.)S1080 V970(However,)S1413(customer)S1832(modi\256cations)S2430(should)S2750(not)S2931(be)S3078(placed)S3391(on)S3544(the)S3719(same)S3977(branch)S4301(as)S4437(the)S4612(distributed)S1260 V970(source;)S1309(instead,)S1668(they)S1891(should)S2209(be)S2354(placed)S2665(on)S2816(a)S2911(side)S3123(branch.)S3500(When)S3789(the)S3962(next)S4185(software)S4578(distribution)S1440 V970(arrives,)S1303(it)S1396(should)S1700(be)S1831(appended)S2250(to)S2365(the)S2524(trunk)S2772(of)S2892(the)S3051(customer's)S3527(RCS)S3755(\256le,)S3946(and)S4128(the)S4288(customer)S4692(can)S4868(then)S1620 V970(merge)S1254(the)S1411(local)S1640(modi\256cations)S2220(back)S2443(into)S2634(the)S2791(new)S2992(release.)S3358(In)S3475(the)S3631(above)S3903(example,)S4300(a)S4378(customer's)S4850(RCS)S1800 V970(\256le)S1134(would)S1421(contain)S1752(the)S1911(following)S2337(tree,)S2548(assuming)S2963(that)S3150(the)S3309(customer)S3712(has)S3882(received)S4256(revision)S4615(1.3,)S4802(added)S1980 V970(his)S1124(local)S1355(modi\256cations)S1937(as)S2057(revision)S2416(1.3.1.1,)S2753(then)S2962(received)S3336(revision)S3695(2.4,)S3882(and)S4063(merged)S4399(2.4)S4560(and)S4740(1.3.1.1,)S2160 V970(resulting)S1350(in)S1458(2.4.1.1.)S2471 V8 R2532(1.3)S2570 V2410 H2410 2340 lc2410 2340 mc2410 H2755 2340 lc2755 2340 mc2755 H2755 2570 lc2755 2570 mc2755 H2410 2570 lc2410 2570 mc2471 V4260(2.4)S2570 V4138 H4138 2340 lc4138 2340 mc4138 H4483 2340 lc4483 2340 mc4483 H4483 2570 lc4483 2570 mc4483 H4138 2570 lc4138 2570 mc2455 V2755 H4137 2455 lc4137 2455 mc2466 V4091 H4137 2455 lc4137 2455 mc2443 V4091 H4137 2454 lc4137 2454 mc2932 V3048(1.3.1.1)S3031 V2986 H2986 2801 lc2986 2801 mc2800 V2986 H3331 2800 lc3331 2800 mc3331 H3331 3030 lc3331 3030 mc3031 V3331 H2986 3031 lc2986 3031 mc2570 V2582 H2985 2915 lc2985 2915 mc2894 V2943 H2985 2915 lc2985 2915 mc2877 V2958 H2985 2915 lc2985 2915 mc2932 V4776(2.4.1.1)S3031 V4714 H4714 2801 lc4714 2801 mc2800 V4714 H5059 2800 lc5059 2800 mc5059 H5059 3030 lc5059 3030 mc3031 V5059 H4714 3031 lc4714 3031 mc2570 V4310 H4713 2915 lc4713 2915 mc2894 V4671 H4713 2915 lc4713 2915 mc2877 V4686 H4713 2915 lc4713 2915 mc3211 V10 R1740(Figure)S2031(4.)S2166(A)S2268(customer's)S2736(revision)S3088(tree)S3267(with)S3475(local)S3699(modi\256cations.)S3571 V970(This)S1178(approach)S1573(is)S1670(actually)S2016(practiced)S2411(in)S2519(the)S2671(CSNET)S3018(project,)S3350(where)S3623(several)S3935(universities)S4426(and)S4600(a)S4674(company)S3751 V970(cooperate)S1387(in)S1495(developing)S1969(a)S2043(national)S2395(computer)S2802(network.)S3967 V10 I720(Parallel)S1078(development)S4147 V10 R970(Sometimes)S1451(it)S1543(is)S1646(desirable)S2042(to)S2156(explore)S2491(an)S2621(alternate)S3000(design)S3297(or)S3416(a)S3497(di)S3575 H	(f)show 10 -.5 mul h (f)show10 R3636(erent)S3872(implementation)S4537(technique)S4962(in)S4327 V970(parallel)S1301(with)S1511(the)S1665(main)S1896(line)S2077(development.)S2679(Such)S2910(development)S3457(should)S3755(be)S3880(carried)S4187(out)S4346(on)S4477(a)S4552(side)S4744(branch.)S4507 V970(The)S1155(experimental)S1706(changes)S2057(may)S2259(later)S2466(be)S2590(moved)S2892(into)S3078(the)S3230(main)S3460(line,)S3665(or)S3778(abandoned.)S4723 V10 I720(Conflicting)S1201(updates)S4903 V10 R970(A)S1075(common)S1458(occurrence)S1927(is)S2027(that)S2210(one)S2387(programmer)S2913(has)S3079(checked)S3438(out)S3599(a)S3676(revision,)S4056(but)S4218(cannot)S4518(complete)S4918(the)S5083 V970(assignment)S1459(for)S1614(some)S1864(reason.)S2218(In)S2340(the)S2501(meantime,)S2959(another)S3297(person)S3602(must)S3836(perform)S4196(another)S4534(modi\256cation)S5263 V970(immediately.)S1565(In)S1689(that)S1880(case,)S2117(the)S2280(second)S2598(person)S2905(should)S3213(check-out)S3647(the)S3810(same)S4056(revision,)S4444(modify)S4774(it,)S4896(and)S5443 V970(check)S1232(it)S1318(in)S1426(on)S1556(a)S1630(side)S1821(branch,)S2147(for)S2293(later)S2500(merging.)S5659 V970(Every)S1238(node)S1462(in)S1570(a)S1644(revision)S1996(tree)S2175(consists)S2522(of)S2635(the)S2787(following)S3206(attributes:)S3636(a)S3711(revision)S4064(number,)S4425(a)S4500(check-in)S4874(date)S5839 V720(and)S896(time,)S1131(the)S1285(author's)S1644(identi\256cation,)S2229(a)S2305(log)S2465(entry,)S2727(a)S2803(state)S3018(and)S3194(the)S3348(actual)S3618(text.)S3855(All)S4015(these)S4252(attributes)S4656(are)S4808(deter-)S6019 V720(mined)S1000(at)S1102(the)S1254(time)S1462(the)S1614(revision)S1966(is)S2063(checked)S2419(in.)S2582(The)S2767(state)S2980(attribute)S3344(indicates)S3730(the)S3883(status)S4142(of)S4256(a)S4331(revision.)S4739(It)S4831(is)S4929(set)S6199 V720(automatically)S1299(to)S1412(`experimental')S2034(during)S2330(check-in.)S2763(A)S2870(revision)S3227(can)S3400(later)S3612(be)S3741(promoted)S4158(to)S4270(a)S4348(higher)S4637(status,)S4924(for)S6379 V720(example)S1088(`stable')S1417(or)S1530(`released'.)S2007(The)S2192(set)S2333(of)S2446(states)S2698(is)S2795(user-de\256ned.)S6739 V10 B720(3.2.)S930(Revisions)S1366(are)S1534(represented)S2068(as)S2187(deltas)S6955 V10 R970(For)S1145(conserving)S1619(space,)S1901(RCS)S2127(stores)S2396(revisions)S2793(in)S2907(the)S3065(form)S3295(of)S3414(deltas,)S3708(i.e.,)S3891(as)S4010(di)S4088 H	(f)show 10 -.5 mul h (f)show10 R4149(erences)S4483(between)S4852(revi-)S7135 V720(sions.)S1011(The)S1196(user)S1392(interface)S1770(completely)S2244(hides)S2485(this)S2660(fact.)S7920 VEP%%Page: 7 8BP/slant 0 def/height 1.000000 def10 R10 R40 V0(-)S580 V2792(- 7 -)S900 V970(A)S1096(delta)S1344(is)S1465(a)S1563(sequence)S1982(of)S2119(edit)S2323(commands)S2810(that)S3014(transforms)S3495(one)S3694(string)S3977(into)S4188(another.)S4597(The)S4807(deltas)S1080 V720(employed)S1156(by)S1298(RCS)S1529(are)S1691(line-based,)S2167(which)S2452(means)S2748(that)S2939(the)S3102(only)S3321(edit)S3512(commands)S3986(allowed)S4343(are)S4505(insertion)S4896(and)S1260 V720(deletion)S1091(of)S1223(lines.)S1516(If)S1631(a)S1724(single)S2012(character)S2425(in)S2552(a)S2646(line)S2846(is)S2963(changed,)S3370(the)S3542(edit)S3742(scripts)S4053(consider)S4441(the)S4613(entire)S4890(line)S1440 V720(changed.)S1145(The)S1337(program)S10 I1712(diff)S1390 V10 R1846(2)S1440 V1933(produces)S2330(a)S2411(small,)S2690(line-based)S3137(delta)S3368(between)S3737(pairs)S3968(of)S4088(text)S4275(\256les.)S4534(A)S4643(character-)S1620 V720(based)S977(edit)S
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