clone: report duplicate entries on case-insensitive filesystems

Paths that only differ in case work fine in a case-sensitive
filesystems, but if those repos are cloned in a case-insensitive one,
you'll get problems. The first thing to notice is "git status" will
never be clean with no indication what exactly is "dirty".

This patch helps the situation a bit by pointing out the problem at
clone time. Even though this patch talks about case sensitivity, the
patch makes no assumption about folding rules by the filesystem. It
simply observes that if an entry has been already checked out at clone
time when we're about to write a new path, some folding rules are
behind this.

In the case that we can't rely on filesystem (via inode number) to do
this check, fall back to fspathcmp() which is not perfect but should
not give false positives.

This patch is tested with vim-colorschemes and Sublime-Gitignore
repositories on a JFS partition with case insensitive support on
Linux.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
6 files changed
tree: d7138412cf388250032989b8d76a7a643011773d
  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. alias.h
  35. alloc.c
  36. alloc.h
  37. apply.c
  38. apply.h
  39. archive-tar.c
  40. archive-zip.c
  41. archive.c
  42. archive.h
  43. argv-array.c
  44. argv-array.h
  45. attr.c
  46. attr.h
  47. base85.c
  48. bisect.c
  49. bisect.h
  50. blame.c
  51. blame.h
  52. blob.c
  53. blob.h
  54. branch.c
  55. branch.h
  56. builtin.h
  57. bulk-checkin.c
  58. bulk-checkin.h
  59. bundle.c
  60. bundle.h
  61. cache-tree.c
  62. cache-tree.h
  63. cache.h
  64. chdir-notify.c
  65. chdir-notify.h
  66. check-builtins.sh
  67. check-racy.c
  68. check_bindir
  69. checkout.c
  70. checkout.h
  71. color.c
  72. color.h
  73. column.c
  74. column.h
  75. combine-diff.c
  76. command-list.txt
  77. commit-graph.c
  78. commit-graph.h
  79. commit-slab-decl.h
  80. commit-slab-impl.h
  81. commit-slab.h
  82. commit.c
  83. commit.h
  84. common-main.c
  85. config.c
  86. config.h
  87. config.mak.dev
  88. config.mak.in
  89. config.mak.uname
  90. configure.ac
  91. connect.c
  92. connect.h
  93. connected.c
  94. connected.h
  95. convert.c
  96. convert.h
  97. copy.c
  98. COPYING
  99. credential-cache--daemon.c
  100. credential-cache.c
  101. credential-store.c
  102. credential.c
  103. credential.h
  104. csum-file.c
  105. csum-file.h
  106. ctype.c
  107. daemon.c
  108. date.c
  109. decorate.c
  110. decorate.h
  111. delta.h
  112. detect-compiler
  113. diff-delta.c
  114. diff-lib.c
  115. diff-no-index.c
  116. diff.c
  117. diff.h
  118. diffcore-break.c
  119. diffcore-delta.c
  120. diffcore-order.c
  121. diffcore-pickaxe.c
  122. diffcore-rename.c
  123. diffcore.h
  124. dir-iterator.c
  125. dir-iterator.h
  126. dir.c
  127. dir.h
  128. editor.c
  129. entry.c
  130. environment.c
  131. exec-cmd.c
  132. exec-cmd.h
  133. fast-import.c
  134. fetch-object.c
  135. fetch-object.h
  136. fetch-pack.c
  137. fetch-pack.h
  138. fmt-merge-msg.h
  139. fsck.c
  140. fsck.h
  141. fsmonitor.c
  142. fsmonitor.h
  143. generate-cmdlist.sh
  144. gettext.c
  145. gettext.h
  146. git-add--interactive.perl
  147. git-archimport.perl
  148. git-bisect.sh
  149. git-compat-util.h
  150. git-cvsexportcommit.perl
  151. git-cvsimport.perl
  152. git-cvsserver.perl
  153. git-difftool--helper.sh
  154. git-filter-branch.sh
  155. git-instaweb.sh
  156. git-merge-octopus.sh
  157. git-merge-one-file.sh
  158. git-merge-resolve.sh
  159. git-mergetool--lib.sh
  160. git-mergetool.sh
  161. git-p4.py
  162. git-parse-remote.sh
  163. git-quiltimport.sh
  164. git-rebase--am.sh
  165. git-rebase--interactive.sh
  166. git-rebase--merge.sh
  167. git-rebase--preserve-merges.sh
  168. git-rebase.sh
  169. git-remote-testgit.sh
  170. git-request-pull.sh
  171. git-send-email.perl
  172. git-sh-i18n.sh
  173. git-sh-setup.sh
  174. git-stash.sh
  175. git-submodule.sh
  176. git-svn.perl
  177. GIT-VERSION-GEN
  178. git-web--browse.sh
  179. git.c
  180. git.rc
  181. gpg-interface.c
  182. gpg-interface.h
  183. graph.c
  184. graph.h
  185. grep.c
  186. grep.h
  187. hash.h
  188. hashmap.c
  189. hashmap.h
  190. help.c
  191. help.h
  192. hex.c
  193. http-backend.c
  194. http-fetch.c
  195. http-push.c
  196. http-walker.c
  197. http.c
  198. http.h
  199. ident.c
  200. imap-send.c
  201. INSTALL
  202. iterator.h
  203. khash.h
  204. kwset.c
  205. kwset.h
  206. levenshtein.c
  207. levenshtein.h
  208. LGPL-2.1
  209. line-log.c
  210. line-log.h
  211. line-range.c
  212. line-range.h
  213. list-objects-filter-options.c
  214. list-objects-filter-options.h
  215. list-objects-filter.c
  216. list-objects-filter.h
  217. list-objects.c
  218. list-objects.h
  219. list.h
  220. ll-merge.c
  221. ll-merge.h
  222. lockfile.c
  223. lockfile.h
  224. log-tree.c
  225. log-tree.h
  226. ls-refs.c
  227. ls-refs.h
  228. mailinfo.c
  229. mailinfo.h
  230. mailmap.c
  231. mailmap.h
  232. Makefile
  233. match-trees.c
  234. mem-pool.c
  235. mem-pool.h
  236. merge-blobs.c
  237. merge-blobs.h
  238. merge-recursive.c
  239. merge-recursive.h
  240. merge.c
  241. mergesort.c
  242. mergesort.h
  243. name-hash.c
  244. notes-cache.c
  245. notes-cache.h
  246. notes-merge.c
  247. notes-merge.h
  248. notes-utils.c
  249. notes-utils.h
  250. notes.c
  251. notes.h
  252. object-store.h
  253. object.c
  254. object.h
  255. oidmap.c
  256. oidmap.h
  257. oidset.c
  258. oidset.h
  259. pack-bitmap-write.c
  260. pack-bitmap.c
  261. pack-bitmap.h
  262. pack-check.c
  263. pack-objects.c
  264. pack-objects.h
  265. pack-revindex.c
  266. pack-revindex.h
  267. pack-write.c
  268. pack.h
  269. packfile.c
  270. packfile.h
  271. pager.c
  272. parse-options-cb.c
  273. parse-options.c
  274. parse-options.h
  275. patch-delta.c
  276. patch-ids.c
  277. patch-ids.h
  278. path.c
  279. path.h
  280. pathspec.c
  281. pathspec.h
  282. pkt-line.c
  283. pkt-line.h
  284. preload-index.c
  285. pretty.c
  286. pretty.h
  287. prio-queue.c
  288. prio-queue.h
  289. progress.c
  290. progress.h
  291. prompt.c
  292. prompt.h
  293. protocol.c
  294. protocol.h
  295. quote.c
  296. quote.h
  297. reachable.c
  298. reachable.h
  299. read-cache.c
  300. README.md
  301. ref-filter.c
  302. ref-filter.h
  303. reflog-walk.c
  304. reflog-walk.h
  305. refs.c
  306. refs.h
  307. refspec.c
  308. refspec.h
  309. remote-curl.c
  310. remote-testsvn.c
  311. remote.c
  312. remote.h
  313. replace-object.c
  314. replace-object.h
  315. repository.c
  316. repository.h
  317. rerere.c
  318. rerere.h
  319. resolve-undo.c
  320. resolve-undo.h
  321. revision.c
  322. revision.h
  323. run-command.c
  324. run-command.h
  325. send-pack.c
  326. send-pack.h
  327. sequencer.c
  328. sequencer.h
  329. serve.c
  330. serve.h
  331. server-info.c
  332. setup.c
  333. sh-i18n--envsubst.c
  334. sha1-array.c
  335. sha1-array.h
  336. sha1-file.c
  337. sha1-lookup.c
  338. sha1-lookup.h
  339. sha1-name.c
  340. sha1dc_git.c
  341. sha1dc_git.h
  342. shallow.c
  343. shell.c
  344. shortlog.h
  345. sideband.c
  346. sideband.h
  347. sigchain.c
  348. sigchain.h
  349. split-index.c
  350. split-index.h
  351. strbuf.c
  352. strbuf.h
  353. streaming.c
  354. streaming.h
  355. string-list.c
  356. string-list.h
  357. sub-process.c
  358. sub-process.h
  359. submodule-config.c
  360. submodule-config.h
  361. submodule.c
  362. submodule.h
  363. symlinks.c
  364. tag.c
  365. tag.h
  366. tar.h
  367. tempfile.c
  368. tempfile.h
  369. thread-utils.c
  370. thread-utils.h
  371. tmp-objdir.c
  372. tmp-objdir.h
  373. trace.c
  374. trace.h
  375. trailer.c
  376. trailer.h
  377. transport-helper.c
  378. transport-internal.h
  379. transport.c
  380. transport.h
  381. tree-diff.c
  382. tree-walk.c
  383. tree-walk.h
  384. tree.c
  385. tree.h
  386. unicode-width.h
  387. unimplemented.sh
  388. unix-socket.c
  389. unix-socket.h
  390. unpack-trees.c
  391. unpack-trees.h
  392. upload-pack.c
  393. upload-pack.h
  394. url.c
  395. url.h
  396. urlmatch.c
  397. urlmatch.h
  398. usage.c
  399. userdiff.c
  400. userdiff.h
  401. utf8.c
  402. utf8.h
  403. varint.c
  404. varint.h
  405. version.c
  406. version.h
  407. versioncmp.c
  408. walker.c
  409. walker.h
  410. wildmatch.c
  411. wildmatch.h
  412. worktree.c
  413. worktree.h
  414. wrap-for-bin.sh
  415. wrapper.c
  416. write-or-die.c
  417. ws.c
  418. wt-status.c
  419. wt-status.h
  420. xdiff-interface.c
  421. xdiff-interface.h
  422. 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.

Issues which are security relevant should be disclosed privately to the Git Security mailing list git-security@googlegroups.com.

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