Integrate hash algorithm support with repo setup

In future versions of Git, we plan to support an additional hash
algorithm.  Integrate the enumeration of hash algorithms with repository
setup, and store a pointer to the enumerated data in struct repository.
Of course, we currently only support SHA-1, so hard-code this value in
read_repository_format.  In the future, we'll enumerate this value from
the configuration.

Add a constant, the_hash_algo, which points to the hash_algo structure
pointer in the repository global.  Note that this is the hash which is
used to serialize data to disk, not the hash which is used to display
items to the user.  The transition plan anticipates that these may be
different.  We can add an additional element in the future (say,
ui_hash_algo) to provide for this case.

Include repository.h in cache.h since we now need to have access to
these struct and variable definitions.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
4 files changed
tree: f482c347f6b747f214c43275822e4b08086772b2
  1. .github/
  2. block-sha1/
  3. builtin/
  4. ci/
  5. compat/
  6. contrib/
  7. Documentation/
  8. ewah/
  9. git-gui/
  10. gitk-git/
  11. gitweb/
  12. mergetools/
  13. perl/
  14. po/
  15. ppc/
  16. refs/
  17. sha1dc/
  18. t/
  19. templates/
  20. vcs-svn/
  21. xdiff/
  22. .clang-format
  23. .gitattributes
  24. .gitignore
  25. .gitmodules
  26. .mailmap
  27. .travis.yml
  28. .tsan-suppressions
  29. abspath.c
  30. aclocal.m4
  31. advice.c
  32. advice.h
  33. alias.c
  34. alloc.c
  35. apply.c
  36. apply.h
  37. archive-tar.c
  38. archive-zip.c
  39. archive.c
  40. archive.h
  41. argv-array.c
  42. argv-array.h
  43. attr.c
  44. attr.h
  45. base85.c
  46. bisect.c
  47. bisect.h
  48. blame.c
  49. blame.h
  50. blob.c
  51. blob.h
  52. branch.c
  53. branch.h
  54. builtin.h
  55. bulk-checkin.c
  56. bulk-checkin.h
  57. bundle.c
  58. bundle.h
  59. cache-tree.c
  60. cache-tree.h
  61. cache.h
  62. check-builtins.sh
  63. check-racy.c
  64. check_bindir
  65. color.c
  66. color.h
  67. column.c
  68. column.h
  69. combine-diff.c
  70. command-list.txt
  71. commit-slab.h
  72. commit.c
  73. commit.h
  74. common-main.c
  75. config.c
  76. config.h
  77. config.mak.in
  78. config.mak.uname
  79. configure.ac
  80. connect.c
  81. connect.h
  82. connected.c
  83. connected.h
  84. convert.c
  85. convert.h
  86. copy.c
  87. COPYING
  88. credential-cache--daemon.c
  89. credential-cache.c
  90. credential-store.c
  91. credential.c
  92. credential.h
  93. csum-file.c
  94. csum-file.h
  95. ctype.c
  96. daemon.c
  97. date.c
  98. decorate.c
  99. decorate.h
  100. delta.h
  101. diff-delta.c
  102. diff-lib.c
  103. diff-no-index.c
  104. diff.c
  105. diff.h
  106. diffcore-break.c
  107. diffcore-delta.c
  108. diffcore-order.c
  109. diffcore-pickaxe.c
  110. diffcore-rename.c
  111. diffcore.h
  112. dir-iterator.c
  113. dir-iterator.h
  114. dir.c
  115. dir.h
  116. editor.c
  117. entry.c
  118. environment.c
  119. exec_cmd.c
  120. exec_cmd.h
  121. fast-import.c
  122. fetch-pack.c
  123. fetch-pack.h
  124. fmt-merge-msg.h
  125. fsck.c
  126. fsck.h
  127. generate-cmdlist.sh
  128. gettext.c
  129. gettext.h
  130. git-add--interactive.perl
  131. git-archimport.perl
  132. git-bisect.sh
  133. git-compat-util.h
  134. git-cvsexportcommit.perl
  135. git-cvsimport.perl
  136. git-cvsserver.perl
  137. git-difftool--helper.sh
  138. git-filter-branch.sh
  139. git-instaweb.sh
  140. git-merge-octopus.sh
  141. git-merge-one-file.sh
  142. git-merge-resolve.sh
  143. git-mergetool--lib.sh
  144. git-mergetool.sh
  145. git-p4.py
  146. git-parse-remote.sh
  147. git-quiltimport.sh
  148. git-rebase--am.sh
  149. git-rebase--interactive.sh
  150. git-rebase--merge.sh
  151. git-rebase.sh
  152. git-remote-testgit.sh
  153. git-request-pull.sh
  154. git-send-email.perl
  155. git-sh-i18n.sh
  156. git-sh-setup.sh
  157. git-stash.sh
  158. git-submodule.sh
  159. git-svn.perl
  160. GIT-VERSION-GEN
  161. git-web--browse.sh
  162. git.c
  163. git.rc
  164. gpg-interface.c
  165. gpg-interface.h
  166. graph.c
  167. graph.h
  168. grep.c
  169. grep.h
  170. hash.h
  171. hashmap.c
  172. hashmap.h
  173. help.c
  174. help.h
  175. hex.c
  176. http-backend.c
  177. http-fetch.c
  178. http-push.c
  179. http-walker.c
  180. http.c
  181. http.h
  182. ident.c
  183. imap-send.c
  184. INSTALL
  185. iterator.h
  186. khash.h
  187. kwset.c
  188. kwset.h
  189. levenshtein.c
  190. levenshtein.h
  191. LGPL-2.1
  192. line-log.c
  193. line-log.h
  194. line-range.c
  195. line-range.h
  196. list-objects.c
  197. list-objects.h
  198. list.h
  199. ll-merge.c
  200. ll-merge.h
  201. lockfile.c
  202. lockfile.h
  203. log-tree.c
  204. log-tree.h
  205. mailinfo.c
  206. mailinfo.h
  207. mailmap.c
  208. mailmap.h
  209. Makefile
  210. match-trees.c
  211. merge-blobs.c
  212. merge-blobs.h
  213. merge-recursive.c
  214. merge-recursive.h
  215. merge.c
  216. mergesort.c
  217. mergesort.h
  218. mru.c
  219. mru.h
  220. name-hash.c
  221. notes-cache.c
  222. notes-cache.h
  223. notes-merge.c
  224. notes-merge.h
  225. notes-utils.c
  226. notes-utils.h
  227. notes.c
  228. notes.h
  229. object.c
  230. object.h
  231. oidmap.c
  232. oidmap.h
  233. oidset.c
  234. oidset.h
  235. pack-bitmap-write.c
  236. pack-bitmap.c
  237. pack-bitmap.h
  238. pack-check.c
  239. pack-objects.c
  240. pack-objects.h
  241. pack-revindex.c
  242. pack-revindex.h
  243. pack-write.c
  244. pack.h
  245. packfile.c
  246. packfile.h
  247. pager.c
  248. parse-options-cb.c
  249. parse-options.c
  250. parse-options.h
  251. patch-delta.c
  252. patch-ids.c
  253. patch-ids.h
  254. path.c
  255. path.h
  256. pathspec.c
  257. pathspec.h
  258. pkt-line.c
  259. pkt-line.h
  260. preload-index.c
  261. pretty.c
  262. prio-queue.c
  263. prio-queue.h
  264. progress.c
  265. progress.h
  266. prompt.c
  267. prompt.h
  268. quote.c
  269. quote.h
  270. reachable.c
  271. reachable.h
  272. read-cache.c
  273. README.md
  274. ref-filter.c
  275. ref-filter.h
  276. reflog-walk.c
  277. reflog-walk.h
  278. refs.c
  279. refs.h
  280. remote-curl.c
  281. remote-testsvn.c
  282. remote.c
  283. remote.h
  284. replace_object.c
  285. repository.c
  286. repository.h
  287. rerere.c
  288. rerere.h
  289. resolve-undo.c
  290. resolve-undo.h
  291. revision.c
  292. revision.h
  293. run-command.c
  294. run-command.h
  295. send-pack.c
  296. send-pack.h
  297. sequencer.c
  298. sequencer.h
  299. server-info.c
  300. setup.c
  301. sh-i18n--envsubst.c
  302. sha1-array.c
  303. sha1-array.h
  304. sha1-lookup.c
  305. sha1-lookup.h
  306. sha1_file.c
  307. sha1_name.c
  308. sha1dc_git.c
  309. sha1dc_git.h
  310. shallow.c
  311. shell.c
  312. shortlog.h
  313. show-index.c
  314. sideband.c
  315. sideband.h
  316. sigchain.c
  317. sigchain.h
  318. split-index.c
  319. split-index.h
  320. strbuf.c
  321. strbuf.h
  322. streaming.c
  323. streaming.h
  324. string-list.c
  325. string-list.h
  326. sub-process.c
  327. sub-process.h
  328. submodule-config.c
  329. submodule-config.h
  330. submodule.c
  331. submodule.h
  332. symlinks.c
  333. tag.c
  334. tag.h
  335. tar.h
  336. tempfile.c
  337. tempfile.h
  338. thread-utils.c
  339. thread-utils.h
  340. tmp-objdir.c
  341. tmp-objdir.h
  342. trace.c
  343. trace.h
  344. trailer.c
  345. trailer.h
  346. transport-helper.c
  347. transport.c
  348. transport.h
  349. tree-diff.c
  350. tree-walk.c
  351. tree-walk.h
  352. tree.c
  353. tree.h
  354. unicode_width.h
  355. unimplemented.sh
  356. unix-socket.c
  357. unix-socket.h
  358. unpack-trees.c
  359. unpack-trees.h
  360. upload-pack.c
  361. url.c
  362. url.h
  363. urlmatch.c
  364. urlmatch.h
  365. usage.c
  366. userdiff.c
  367. userdiff.h
  368. utf8.c
  369. utf8.h
  370. varint.c
  371. varint.h
  372. version.c
  373. version.h
  374. versioncmp.c
  375. walker.c
  376. walker.h
  377. wildmatch.c
  378. wildmatch.h
  379. worktree.c
  380. worktree.h
  381. wrap-for-bin.sh
  382. wrapper.c
  383. write_or_die.c
  384. ws.c
  385. wt-status.c
  386. wt-status.h
  387. xdiff-interface.c
  388. xdiff-interface.h
  389. zlib.c
README.md

Git - fast, scalable, distributed revision control system

Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals.

Git is an Open Source project covered by the GNU General Public License version 2 (some parts of it are under different licenses, compatible with the GPLv2). It was originally written by Linus Torvalds with help of a group of hackers around the net.

Please read the file INSTALL for installation instructions.

Many Git online resources are accessible from https://git-scm.com/ including full documentation and Git related tools.

See Documentation/gittutorial.txt to get started, then see Documentation/giteveryday.txt for a useful minimum set of commands, and Documentation/git-.txt for documentation of each command. If git has been correctly installed, then the tutorial can also be read with man gittutorial or git help tutorial, and the documentation of each command with man git-<commandname> or git help <commandname>.

CVS users may also want to read Documentation/gitcvs-migration.txt (man gitcvs-migration or git help cvs-migration if git is installed).

The user discussion and development of Git take place on the Git mailing list -- everyone is welcome to post bug reports, feature requests, comments and patches to git@vger.kernel.org (read Documentation/SubmittingPatches for instructions on patch submission). To subscribe to the list, send an email with just “subscribe git” in the body to majordomo@vger.kernel.org. The mailing list archives are available at https://public-inbox.org/git/, http://marc.info/?l=git and other archival sites.

The maintainer frequently sends the “What's cooking” reports that list the current status of various development topics to the mailing list. The discussion following them give a good reference for project status, development direction and remaining tasks.

The name “git” was given by Linus Torvalds when he wrote the very first version. He described the tool as “the stupid content tracker” and the name as (depending on your mood):

  • random three-letter combination that is pronounceable, and not actually used by any common UNIX command. The fact that it is a mispronunciation of “get” may or may not be relevant.
  • stupid. contemptible and despicable. simple. Take your pick from the dictionary of slang.
  • “global information tracker”: you're in a good mood, and it actually works for you. Angels sing, and a light suddenly fills the room.
  • “goddamn idiotic truckload of sh*t”: when it breaks