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chromium / external / gitster / git-htmldocs / c1f1c70762f00b54d67219ad3575fa37ad1c07d0 / . / howto / revert-branch-rebase.html
blob: 38e3b2a092f522fdf2e12ffee2881d3870516a4d [file] [log] [blame]
Junio C Hamano944ce252018-05-30 22:25:26[diff] [blame]1<?xml version="1.0" encoding="UTF-8"?>
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
3 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
4<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
5<head>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]6<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
Junio C Hamanoa85030a2022-07-27 16:48:21[diff] [blame]7<meta name="generator" content="AsciiDoc 10.2.0" />
Junio C Hamanof2b74942012-11-20 21:06:26[diff] [blame]8<title>How to revert an existing commit</title>
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]9<style type="text/css">
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]10/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
11
12/* Default font. */
13body {
14 font-family: Georgia,serif;
15}
16
17/* Title font. */
18h1, h2, h3, h4, h5, h6,
19div.title, caption.title,
20thead, p.table.header,
21#toctitle,
22#author, #revnumber, #revdate, #revremark,
23#footer {
24 font-family: Arial,Helvetica,sans-serif;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]25}
26
27body {
28 margin: 1em 5% 1em 5%;
29}
30
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]31a {
32 color: blue;
33 text-decoration: underline;
34}
35a:visited {
36 color: fuchsia;
37}
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]38
39em {
40 font-style: italic;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]41 color: navy;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]42}
43
44strong {
45 font-weight: bold;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]46 color: #083194;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]47}
48
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]49h1, h2, h3, h4, h5, h6 {
50 color: #527bbd;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]51 margin-top: 1.2em;
52 margin-bottom: 0.5em;
53 line-height: 1.3;
54}
55
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]56h1, h2, h3 {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]57 border-bottom: 2px solid silver;
58}
59h2 {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]60 padding-top: 0.5em;
61}
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]62h3 {
63 float: left;
64}
65h3 + * {
66 clear: left;
67}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]68h5 {
69 font-size: 1.0em;
70}
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]71
72div.sectionbody {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]73 margin-left: 0;
74}
75
76hr {
77 border: 1px solid silver;
78}
79
80p {
81 margin-top: 0.5em;
82 margin-bottom: 0.5em;
83}
84
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]85ul, ol, li > p {
86 margin-top: 0;
87}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]88ul > li { color: #aaa; }
89ul > li > * { color: black; }
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]90
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]91.monospaced, code, pre {
92 font-family: "Courier New", Courier, monospace;
93 font-size: inherit;
94 color: navy;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]95 padding: 0;
96 margin: 0;
97}
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]98pre {
99 white-space: pre-wrap;
100}
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]101
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]102#author {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]103 color: #527bbd;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]104 font-weight: bold;
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]105 font-size: 1.1em;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]106}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]107#email {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]108}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]109#revnumber, #revdate, #revremark {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]110}
111
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]112#footer {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]113 font-size: small;
114 border-top: 2px solid silver;
115 padding-top: 0.5em;
116 margin-top: 4.0em;
117}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]118#footer-text {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]119 float: left;
120 padding-bottom: 0.5em;
121}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]122#footer-badges {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]123 float: right;
124 padding-bottom: 0.5em;
125}
126
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]127#preamble {
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]128 margin-top: 1.5em;
129 margin-bottom: 1.5em;
130}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]131div.imageblock, div.exampleblock, div.verseblock,
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]132div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
133div.admonitionblock {
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]134 margin-top: 1.0em;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]135 margin-bottom: 1.5em;
136}
137div.admonitionblock {
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]138 margin-top: 2.0em;
139 margin-bottom: 2.0em;
140 margin-right: 10%;
141 color: #606060;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]142}
143
144div.content { /* Block element content. */
145 padding: 0;
146}
147
148/* Block element titles. */
149div.title, caption.title {
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]150 color: #527bbd;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]151 font-weight: bold;
152 text-align: left;
153 margin-top: 1.0em;
154 margin-bottom: 0.5em;
155}
156div.title + * {
157 margin-top: 0;
158}
159
160td div.title:first-child {
161 margin-top: 0.0em;
162}
163div.content div.title:first-child {
164 margin-top: 0.0em;
165}
166div.content + div.title {
167 margin-top: 0.0em;
168}
169
170div.sidebarblock > div.content {
171 background: #ffffee;
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]172 border: 1px solid #dddddd;
173 border-left: 4px solid #f0f0f0;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]174 padding: 0.5em;
175}
176
177div.listingblock > div.content {
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]178 border: 1px solid #dddddd;
179 border-left: 5px solid #f0f0f0;
180 background: #f8f8f8;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]181 padding: 0.5em;
182}
183
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]184div.quoteblock, div.verseblock {
185 padding-left: 1.0em;
186 margin-left: 1.0em;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]187 margin-right: 10%;
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]188 border-left: 5px solid #f0f0f0;
189 color: #888;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]190}
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]191
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]192div.quoteblock > div.attribution {
193 padding-top: 0.5em;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]194 text-align: right;
195}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]196
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]197div.verseblock > pre.content {
198 font-family: inherit;
199 font-size: inherit;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]200}
201div.verseblock > div.attribution {
202 padding-top: 0.75em;
203 text-align: left;
204}
205/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]206div.verseblock + div.attribution {
207 text-align: left;
208}
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]209
210div.admonitionblock .icon {
211 vertical-align: top;
212 font-size: 1.1em;
213 font-weight: bold;
214 text-decoration: underline;
215 color: #527bbd;
216 padding-right: 0.5em;
217}
218div.admonitionblock td.content {
219 padding-left: 0.5em;
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]220 border-left: 3px solid #dddddd;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]221}
222
223div.exampleblock > div.content {
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]224 border-left: 3px solid #dddddd;
225 padding-left: 0.5em;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]226}
227
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]228div.imageblock div.content { padding-left: 0; }
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]229span.image img { border-style: none; vertical-align: text-bottom; }
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]230a.image:visited { color: white; }
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]231
232dl {
233 margin-top: 0.8em;
234 margin-bottom: 0.8em;
235}
236dt {
237 margin-top: 0.5em;
238 margin-bottom: 0;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]239 font-style: normal;
240 color: navy;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]241}
242dd > *:first-child {
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]243 margin-top: 0.1em;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]244}
245
246ul, ol {
247 list-style-position: outside;
248}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]249ol.arabic {
250 list-style-type: decimal;
251}
252ol.loweralpha {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]253 list-style-type: lower-alpha;
254}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]255ol.upperalpha {
256 list-style-type: upper-alpha;
257}
258ol.lowerroman {
259 list-style-type: lower-roman;
260}
261ol.upperroman {
262 list-style-type: upper-roman;
263}
264
265div.compact ul, div.compact ol,
266div.compact p, div.compact p,
267div.compact div, div.compact div {
268 margin-top: 0.1em;
269 margin-bottom: 0.1em;
270}
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]271
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]272tfoot {
273 font-weight: bold;
274}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]275td > div.verse {
276 white-space: pre;
277}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]278
279div.hdlist {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]280 margin-top: 0.8em;
281 margin-bottom: 0.8em;
282}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]283div.hdlist tr {
284 padding-bottom: 15px;
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]285}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]286dt.hdlist1.strong, td.hdlist1.strong {
287 font-weight: bold;
288}
289td.hdlist1 {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]290 vertical-align: top;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]291 font-style: normal;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]292 padding-right: 0.8em;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]293 color: navy;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]294}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]295td.hdlist2 {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]296 vertical-align: top;
297}
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]298div.hdlist.compact tr {
299 margin: 0;
300 padding-bottom: 0;
301}
302
303.comment {
304 background: yellow;
305}
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]306
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]307.footnote, .footnoteref {
308 font-size: 0.8em;
309}
310
311span.footnote, span.footnoteref {
312 vertical-align: super;
313}
314
315#footnotes {
316 margin: 20px 0 20px 0;
317 padding: 7px 0 0 0;
318}
319
320#footnotes div.footnote {
321 margin: 0 0 5px 0;
322}
323
324#footnotes hr {
325 border: none;
326 border-top: 1px solid silver;
327 height: 1px;
328 text-align: left;
329 margin-left: 0;
330 width: 20%;
331 min-width: 100px;
332}
333
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]334div.colist td {
335 padding-right: 0.5em;
336 padding-bottom: 0.3em;
337 vertical-align: top;
338}
339div.colist td img {
340 margin-top: 0.3em;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]341}
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]342
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]343@media print {
344 #footer-badges { display: none; }
345}
346
347#toc {
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]348 margin-bottom: 2.5em;
349}
350
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]351#toctitle {
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]352 color: #527bbd;
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]353 font-size: 1.1em;
354 font-weight: bold;
355 margin-top: 1.0em;
356 margin-bottom: 0.1em;
357}
358
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]359div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]360 margin-top: 0;
361 margin-bottom: 0;
362}
363div.toclevel2 {
364 margin-left: 2em;
365 font-size: 0.9em;
366}
367div.toclevel3 {
368 margin-left: 4em;
369 font-size: 0.9em;
370}
371div.toclevel4 {
372 margin-left: 6em;
373 font-size: 0.9em;
374}
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]375
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]376span.aqua { color: aqua; }
377span.black { color: black; }
378span.blue { color: blue; }
379span.fuchsia { color: fuchsia; }
380span.gray { color: gray; }
381span.green { color: green; }
382span.lime { color: lime; }
383span.maroon { color: maroon; }
384span.navy { color: navy; }
385span.olive { color: olive; }
386span.purple { color: purple; }
387span.red { color: red; }
388span.silver { color: silver; }
389span.teal { color: teal; }
390span.white { color: white; }
391span.yellow { color: yellow; }
392
393span.aqua-background { background: aqua; }
394span.black-background { background: black; }
395span.blue-background { background: blue; }
396span.fuchsia-background { background: fuchsia; }
397span.gray-background { background: gray; }
398span.green-background { background: green; }
399span.lime-background { background: lime; }
400span.maroon-background { background: maroon; }
401span.navy-background { background: navy; }
402span.olive-background { background: olive; }
403span.purple-background { background: purple; }
404span.red-background { background: red; }
405span.silver-background { background: silver; }
406span.teal-background { background: teal; }
407span.white-background { background: white; }
408span.yellow-background { background: yellow; }
409
410span.big { font-size: 2em; }
411span.small { font-size: 0.6em; }
412
413span.underline { text-decoration: underline; }
414span.overline { text-decoration: overline; }
415span.line-through { text-decoration: line-through; }
416
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]417div.unbreakable { page-break-inside: avoid; }
418
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]419
420/*
421 * xhtml11 specific
422 *
423 * */
424
425div.tableblock {
426 margin-top: 1.0em;
427 margin-bottom: 1.5em;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]428}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]429div.tableblock > table {
430 border: 3px solid #527bbd;
431}
432thead, p.table.header {
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]433 font-weight: bold;
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]434 color: #527bbd;
435}
436p.table {
437 margin-top: 0;
438}
Junio C Hamano725b0da2020-01-22 22:02:40[diff] [blame]439/* Because the table frame attribute is overridden by CSS in most browsers. */
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]440div.tableblock > table[frame="void"] {
441 border-style: none;
442}
443div.tableblock > table[frame="hsides"] {
444 border-left-style: none;
445 border-right-style: none;
446}
447div.tableblock > table[frame="vsides"] {
448 border-top-style: none;
449 border-bottom-style: none;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]450}
451
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]452
453/*
454 * html5 specific
455 *
456 * */
457
458table.tableblock {
459 margin-top: 1.0em;
460 margin-bottom: 1.5em;
461}
462thead, p.tableblock.header {
463 font-weight: bold;
464 color: #527bbd;
465}
466p.tableblock {
467 margin-top: 0;
468}
469table.tableblock {
470 border-width: 3px;
471 border-spacing: 0px;
472 border-style: solid;
473 border-color: #527bbd;
474 border-collapse: collapse;
475}
476th.tableblock, td.tableblock {
477 border-width: 1px;
478 padding: 4px;
479 border-style: solid;
480 border-color: #527bbd;
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]481}
482
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]483table.tableblock.frame-topbot {
484 border-left-style: hidden;
485 border-right-style: hidden;
486}
487table.tableblock.frame-sides {
488 border-top-style: hidden;
489 border-bottom-style: hidden;
490}
491table.tableblock.frame-none {
492 border-style: hidden;
493}
494
495th.tableblock.halign-left, td.tableblock.halign-left {
496 text-align: left;
497}
498th.tableblock.halign-center, td.tableblock.halign-center {
499 text-align: center;
500}
501th.tableblock.halign-right, td.tableblock.halign-right {
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]502 text-align: right;
503}
504
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]505th.tableblock.valign-top, td.tableblock.valign-top {
506 vertical-align: top;
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]507}
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]731asciidoc.install();
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Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]734</head>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]735<body class="article">
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]736<div id="header">
Junio C Hamanof2b74942012-11-20 21:06:26[diff] [blame]737<h1>How to revert an existing commit</h1>
Junio C Hamanoc1f1c702023-11-13 03:54:46[diff] [blame^]738<span id="revdate">2023-11-11</span>
Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]739</div>
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]740<div id="content">
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]741<div id="preamble">
742<div class="sectionbody">
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]743<div class="paragraph"><p>One of the changes I pulled into the <em>master</em> branch turns out to
Junio C Hamanod7fccbf2013-07-25 03:24:57[diff] [blame]744break building Git with GCC 2.95. While they were well-intentioned
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]745portability fixes, keeping things working with gcc-2.95 was also
746important. Here is what I did to revert the change in the <em>master</em>
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]747branch and to adjust the <em>seen</em> branch, using core Git tools and
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]748barebone Porcelain.</p></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]749<div class="paragraph"><p>First, prepare a throw-away branch in case I screw things up.</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]750<div class="listingblock">
751<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]752<pre><code>$ git checkout -b revert-c99 master</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]753</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]754<div class="paragraph"><p>Now I am on the <em>revert-c99</em> branch. Let&#8217;s figure out which commit to
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]755revert. I happen to know that the top of the <em>master</em> branch is a
756merge, and its second parent (i.e. foreign commit I merged from) has
757the change I would want to undo. Further I happen to know that that
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]758merge introduced 5 commits or so:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]759<div class="listingblock">
760<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]761<pre><code>$ git show-branch --more=4 master master^2 | head
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]762* [master] Merge refs/heads/portable from http://www.cs.berkeley....
763 ! [master^2] Replace C99 array initializers with code.
764--
765- [master] Merge refs/heads/portable from http://www.cs.berkeley....
766*+ [master^2] Replace C99 array initializers with code.
767*+ [master^2~1] Replace unsetenv() and setenv() with older putenv().
768*+ [master^2~2] Include sys/time.h in daemon.c.
769*+ [master^2~3] Fix ?: statements.
770*+ [master^2~4] Replace zero-length array decls with [].
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]771* [master~1] tutorial note about git branch</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]772</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]773<div class="paragraph"><p>The <em>--more=4</em> above means "after we reach the merge base of refs,
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]774show until we display four more common commits". That last commit
775would have been where the "portable" branch was forked from the main
776git.git repository, so this would show everything on both branches
777since then. I just limited the output to the first handful using
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]778<em>head</em>.</p></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]779<div class="paragraph"><p>Now I know <em>master^2~4</em> (pronounce it as "find the second parent of
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]780the <em>master</em>, and then go four generations back following the first
781parent") is the one I would want to revert. Since I also want to say
782why I am reverting it, the <em>-n</em> flag is given to <em>git revert</em>. This
783prevents it from actually making a commit, and instead <em>git revert</em>
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]784leaves the commit log message it wanted to use in <em>.msg</em> file:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]785<div class="listingblock">
786<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]787<pre><code>$ git revert -n master^2~4
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]788$ cat .msg
789Revert "Replace zero-length array decls with []."
790
791This reverts 6c5f9baa3bc0d63e141e0afc23110205379905a4 commit.
792$ git diff HEAD ;# to make sure what we are reverting makes sense.
793$ make CC=gcc-2.95 clean test ;# make sure it fixed the breakage.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]794$ make clean test ;# make sure it did not cause other breakage.</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]795</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]796<div class="paragraph"><p>The reverted change makes sense (from reading the <em>diff</em> output), does
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]797fix the problem (from <em>make CC=gcc-2.95</em> test), and does not cause new
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]798breakage (from the last <em>make test</em>). I&#8217;m ready to commit:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]799<div class="listingblock">
800<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]801<pre><code>$ git commit -a -s ;# read .msg into the log,
802 # and explain why I am reverting.</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]803</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]804<div class="paragraph"><p>I could have screwed up in any of the above steps, but in the worst
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]805case I could just have done <em>git checkout master</em> to start over.
806Fortunately I did not have to; what I have in the current branch
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]807<em>revert-c99</em> is what I want. So merge that back into <em>master</em>:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]808<div class="listingblock">
809<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]810<pre><code>$ git checkout master
Junio C Hamano3f680f32009-11-16 02:10:54[diff] [blame]811$ git merge revert-c99 ;# this should be a fast-forward
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]812Updating from 10d781b9caa4f71495c7b34963bef137216f86a8 to e3a693c...
813 cache.h | 8 ++++----
814 commit.c | 2 +-
815 ls-files.c | 2 +-
816 receive-pack.c | 2 +-
817 server-info.c | 2 +-
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]818 5 files changed, 8 insertions(+), 8 deletions(-)</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]819</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]820<div class="paragraph"><p>There is no need to redo the test at this point. We fast-forwarded
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]821and we know <em>master</em> matches <em>revert-c99</em> exactly. In fact:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]822<div class="listingblock">
823<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]824<pre><code>$ git diff master..revert-c99</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]825</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]826<div class="paragraph"><p>says nothing.</p></div>
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]827<div class="paragraph"><p>Then we rebase the <em>seen</em> branch as usual.</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]828<div class="listingblock">
829<div class="content">
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]830<pre><code>$ git checkout seen
831$ git tag seen-anchor seen
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]832$ git rebase master
833* Applying: Redo "revert" using three-way merge machinery.
834First trying simple merge strategy to cherry-pick.
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]835* Applying: Remove git-apply-patch-script.
836First trying simple merge strategy to cherry-pick.
837Simple cherry-pick fails; trying Automatic cherry-pick.
838Removing Documentation/git-apply-patch-script.txt
839Removing git-apply-patch-script
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]840* Applying: Document "git cherry-pick" and "git revert"
841First trying simple merge strategy to cherry-pick.
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]842* Applying: mailinfo and applymbox updates
843First trying simple merge strategy to cherry-pick.
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]844* Applying: Show commits in topo order and name all commits.
845First trying simple merge strategy to cherry-pick.
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]846* Applying: More documentation updates.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]847First trying simple merge strategy to cherry-pick.</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]848</div></div>
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]849<div class="paragraph"><p>The temporary tag <em>seen-anchor</em> is me just being careful, in case <em>git
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]850rebase</em> screws up. After this, I can do these for sanity check:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]851<div class="listingblock">
852<div class="content">
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]853<pre><code>$ git diff seen-anchor..seen ;# make sure we got the master fix.
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]854$ make CC=gcc-2.95 clean test ;# make sure it fixed the breakage.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]855$ make clean test ;# make sure it did not cause other breakage.</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]856</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]857<div class="paragraph"><p>Everything is in the good order. I do not need the temporary branch
Junio C Hamanod75148a2014-04-08 19:48:38[diff] [blame]858or tag anymore, so remove them:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]859<div class="listingblock">
860<div class="content">
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]861<pre><code>$ rm -f .git/refs/tags/seen-anchor
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]862$ git branch -d revert-c99</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]863</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]864<div class="paragraph"><p>It was an emergency fix, so we might as well merge it into the
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]865<em>release candidate</em> branch, although I expect the next release would
Junio C Hamano0868a302008-07-22 09:20:44[diff] [blame]866be some days off:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]867<div class="listingblock">
868<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]869<pre><code>$ git checkout rc
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]870$ git pull . master
871Packing 0 objects
872Unpacking 0 objects
873
Junio C Hamanoe6f28d02013-09-17 21:34:00[diff] [blame]874* commit-ish: e3a693c... refs/heads/master from .
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]875Trying to merge e3a693c... into 8c1f5f0... using 10d781b...
876Committed merge 7fb9b7262a1d1e0a47bbfdcbbcf50ce0635d3f8f
877 cache.h | 8 ++++----
878 commit.c | 2 +-
879 ls-files.c | 2 +-
880 receive-pack.c | 2 +-
881 server-info.c | 2 +-
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]882 5 files changed, 8 insertions(+), 8 deletions(-)</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]883</div></div>
Junio C Hamano103b5722011-01-31 05:03:45[diff] [blame]884<div class="paragraph"><p>And the final repository status looks like this:</p></div>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]885<div class="listingblock">
886<div class="content">
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]887<pre><code>$ git show-branch --more=1 master seen rc
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]888! [master] Revert "Replace zero-length array decls with []."
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]889 ! [seen] git-repack: Add option to repack all objects.
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]890 * [rc] Merge refs/heads/master from .
891---
Junio C Hamanoa8911782020-07-07 05:35:57[diff] [blame]892 + [seen] git-repack: Add option to repack all objects.
893 + [seen~1] More documentation updates.
894 + [seen~2] Show commits in topo order and name all commits.
895 + [seen~3] mailinfo and applymbox updates
896 + [seen~4] Document "git cherry-pick" and "git revert"
897 + [seen~5] Remove git-apply-patch-script.
898 + [seen~6] Redo "revert" using three-way merge machinery.
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]899 - [rc] Merge refs/heads/master from .
900++* [master] Revert "Replace zero-length array decls with []."
901 - [rc~1] Merge refs/heads/master from .
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]902... [master~1] Merge refs/heads/portable from http://www.cs.berkeley....</code></pre>
Junio C Hamanod97409f2006-10-03 08:41:56[diff] [blame]903</div></div>
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Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]906</div>
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Junio C Hamano1a4e8412005-12-27 08:17:23[diff] [blame]908<div id="footer">
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Junio C Hamano2ef0ba32018-01-26 23:13:53[diff] [blame]910Last updated
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