git-submodule: add support for --merge.

'git submodule update --merge' merges the commit referenced by the
superproject into your local branch, instead of checking it out on
a detached HEAD.

As evidenced by the addition of "git submodule update --rebase", it
is useful to provide alternatives to the default 'checkout' behaviour
of "git submodule update". One such alternative is, when updating a
submodule to a new commit, to merge that commit into the current
local branch in that submodule. This is useful in workflows where
you want to update your submodule from its upstream, but you cannot
use --rebase, because you have downstream people working on top of
your submodule branch, and you don't want to disrupt their work.

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
4 files changed
tree: 3c330360a9fdc6abf984c5497ae3c9668009cf10
  1. arm/
  2. compat/
  3. contrib/
  4. Documentation/
  5. git-gui/
  6. gitk-git/
  7. gitweb/
  8. mozilla-sha1/
  9. perl/
  10. ppc/
  11. t/
  12. templates/
  13. xdiff/
  14. .gitattributes
  15. .gitignore
  16. .mailmap
  17. abspath.c
  18. alias.c
  19. alloc.c
  20. archive-tar.c
  21. archive-zip.c
  22. archive.c
  23. archive.h
  24. attr.c
  25. attr.h
  26. base85.c
  27. bisect.c
  28. bisect.h
  29. blob.c
  30. blob.h
  31. branch.c
  32. branch.h
  33. builtin-add.c
  34. builtin-annotate.c
  35. builtin-apply.c
  36. builtin-archive.c
  37. builtin-bisect--helper.c
  38. builtin-blame.c
  39. builtin-branch.c
  40. builtin-bundle.c
  41. builtin-cat-file.c
  42. builtin-check-attr.c
  43. builtin-check-ref-format.c
  44. builtin-checkout-index.c
  45. builtin-checkout.c
  46. builtin-clean.c
  47. builtin-clone.c
  48. builtin-commit-tree.c
  49. builtin-commit.c
  50. builtin-config.c
  51. builtin-count-objects.c
  52. builtin-describe.c
  53. builtin-diff-files.c
  54. builtin-diff-index.c
  55. builtin-diff-tree.c
  56. builtin-diff.c
  57. builtin-fast-export.c
  58. builtin-fetch--tool.c
  59. builtin-fetch-pack.c
  60. builtin-fetch.c
  61. builtin-fmt-merge-msg.c
  62. builtin-for-each-ref.c
  63. builtin-fsck.c
  64. builtin-gc.c
  65. builtin-grep.c
  66. builtin-help.c
  67. builtin-http-fetch.c
  68. builtin-init-db.c
  69. builtin-log.c
  70. builtin-ls-files.c
  71. builtin-ls-remote.c
  72. builtin-ls-tree.c
  73. builtin-mailinfo.c
  74. builtin-mailsplit.c
  75. builtin-merge-base.c
  76. builtin-merge-file.c
  77. builtin-merge-ours.c
  78. builtin-merge-recursive.c
  79. builtin-merge.c
  80. builtin-mv.c
  81. builtin-name-rev.c
  82. builtin-pack-objects.c
  83. builtin-pack-refs.c
  84. builtin-prune-packed.c
  85. builtin-prune.c
  86. builtin-push.c
  87. builtin-read-tree.c
  88. builtin-receive-pack.c
  89. builtin-reflog.c
  90. builtin-remote.c
  91. builtin-rerere.c
  92. builtin-reset.c
  93. builtin-rev-list.c
  94. builtin-rev-parse.c
  95. builtin-revert.c
  96. builtin-rm.c
  97. builtin-send-pack.c
  98. builtin-shortlog.c
  99. builtin-show-branch.c
  100. builtin-show-ref.c
  101. builtin-stripspace.c
  102. builtin-symbolic-ref.c
  103. builtin-tag.c
  104. builtin-tar-tree.c
  105. builtin-unpack-objects.c
  106. builtin-update-index.c
  107. builtin-update-ref.c
  108. builtin-upload-archive.c
  109. builtin-verify-pack.c
  110. builtin-verify-tag.c
  111. builtin-write-tree.c
  112. builtin.h
  113. bundle.c
  114. bundle.h
  115. cache-tree.c
  116. cache-tree.h
  117. cache.h
  118. check-builtins.sh
  119. check-racy.c
  120. check_bindir
  121. color.c
  122. color.h
  123. combine-diff.c
  124. command-list.txt
  125. commit.c
  126. commit.h
  127. config.c
  128. config.mak.in
  129. configure.ac
  130. connect.c
  131. convert.c
  132. copy.c
  133. COPYING
  134. csum-file.c
  135. csum-file.h
  136. ctype.c
  137. daemon.c
  138. date.c
  139. decorate.c
  140. decorate.h
  141. delta.h
  142. diff-delta.c
  143. diff-lib.c
  144. diff-no-index.c
  145. diff.c
  146. diff.h
  147. diffcore-break.c
  148. diffcore-delta.c
  149. diffcore-order.c
  150. diffcore-pickaxe.c
  151. diffcore-rename.c
  152. diffcore.h
  153. dir.c
  154. dir.h
  155. editor.c
  156. entry.c
  157. environment.c
  158. exec_cmd.c
  159. exec_cmd.h
  160. fast-import.c
  161. fetch-pack.h
  162. fixup-builtins
  163. fsck.c
  164. fsck.h
  165. generate-cmdlist.sh
  166. git-add--interactive.perl
  167. git-am.sh
  168. git-archimport.perl
  169. git-bisect.sh
  170. git-compat-util.h
  171. git-cvsexportcommit.perl
  172. git-cvsimport.perl
  173. git-cvsserver.perl
  174. git-difftool--helper.sh
  175. git-difftool.perl
  176. git-filter-branch.sh
  177. git-instaweb.sh
  178. git-lost-found.sh
  179. git-merge-octopus.sh
  180. git-merge-one-file.sh
  181. git-merge-resolve.sh
  182. git-mergetool--lib.sh
  183. git-mergetool.sh
  184. git-parse-remote.sh
  185. git-pull.sh
  186. git-quiltimport.sh
  187. git-rebase--interactive.sh
  188. git-rebase.sh
  189. git-relink.perl
  190. git-repack.sh
  191. git-request-pull.sh
  192. git-send-email.perl
  193. git-sh-setup.sh
  194. git-stash.sh
  195. git-submodule.sh
  196. git-svn.perl
  197. GIT-VERSION-GEN
  198. git-web--browse.sh
  199. git.c
  200. git.spec.in
  201. graph.c
  202. graph.h
  203. grep.c
  204. grep.h
  205. hash-object.c
  206. hash.c
  207. hash.h
  208. help.c
  209. help.h
  210. http-push.c
  211. http-walker.c
  212. http.c
  213. http.h
  214. ident.c
  215. imap-send.c
  216. index-pack.c
  217. INSTALL
  218. levenshtein.c
  219. levenshtein.h
  220. list-objects.c
  221. list-objects.h
  222. ll-merge.c
  223. ll-merge.h
  224. lockfile.c
  225. log-tree.c
  226. log-tree.h
  227. mailmap.c
  228. mailmap.h
  229. Makefile
  230. match-trees.c
  231. merge-file.c
  232. merge-index.c
  233. merge-recursive.c
  234. merge-recursive.h
  235. merge-tree.c
  236. mktag.c
  237. mktree.c
  238. name-hash.c
  239. object.c
  240. object.h
  241. pack-check.c
  242. pack-redundant.c
  243. pack-refs.c
  244. pack-refs.h
  245. pack-revindex.c
  246. pack-revindex.h
  247. pack-write.c
  248. pack.h
  249. pager.c
  250. parse-options.c
  251. parse-options.h
  252. patch-delta.c
  253. patch-id.c
  254. patch-ids.c
  255. patch-ids.h
  256. path.c
  257. pkt-line.c
  258. pkt-line.h
  259. preload-index.c
  260. pretty.c
  261. progress.c
  262. progress.h
  263. quote.c
  264. quote.h
  265. reachable.c
  266. reachable.h
  267. read-cache.c
  268. README
  269. reflog-walk.c
  270. reflog-walk.h
  271. refs.c
  272. refs.h
  273. remote.c
  274. remote.h
  275. rerere.c
  276. rerere.h
  277. revision.c
  278. revision.h
  279. run-command.c
  280. run-command.h
  281. send-pack.h
  282. server-info.c
  283. setup.c
  284. sha1-lookup.c
  285. sha1-lookup.h
  286. sha1_file.c
  287. sha1_name.c
  288. shallow.c
  289. shell.c
  290. shortlog.h
  291. show-index.c
  292. sideband.c
  293. sideband.h
  294. sigchain.c
  295. sigchain.h
  296. strbuf.c
  297. strbuf.h
  298. string-list.c
  299. string-list.h
  300. symlinks.c
  301. tag.c
  302. tag.h
  303. tar.h
  304. test-chmtime.c
  305. test-ctype.c
  306. test-date.c
  307. test-delta.c
  308. test-dump-cache-tree.c
  309. test-genrandom.c
  310. test-match-trees.c
  311. test-parse-options.c
  312. test-path-utils.c
  313. test-sha1.c
  314. test-sha1.sh
  315. test-sigchain.c
  316. thread-utils.c
  317. thread-utils.h
  318. trace.c
  319. transport.c
  320. transport.h
  321. tree-diff.c
  322. tree-walk.c
  323. tree-walk.h
  324. tree.c
  325. tree.h
  326. unimplemented.sh
  327. unpack-file.c
  328. unpack-trees.c
  329. unpack-trees.h
  330. update-server-info.c
  331. upload-pack.c
  332. usage.c
  333. userdiff.c
  334. userdiff.h
  335. utf8.c
  336. utf8.h
  337. var.c
  338. walker.c
  339. walker.h
  340. wrapper.c
  341. write_or_die.c
  342. ws.c
  343. wt-status.c
  344. wt-status.h
  345. xdiff-interface.c
  346. xdiff-interface.h