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2016-12-21Merge branch 'jk/index-pack-wo-repo-from-stdin'Libravatar Junio C Hamano6-43/+34
"git index-pack --stdin" needs an access to an existing repository, but "git index-pack file.pack" to generate an .idx file that corresponds to a packfile does not. * jk/index-pack-wo-repo-from-stdin: index-pack: skip collision check when not in repository t: use nongit() function where applicable index-pack: complain when --stdin is used outside of a repo t5000: extract nongit function to test-lib-functions.sh
2016-12-21Merge branch 'jk/quote-env-path-list-component'Libravatar Junio C Hamano2-0/+43
A recent update to receive-pack to make it easier to drop garbage objects made it clear that GIT_ALTERNATE_OBJECT_DIRECTORIES cannot have a pathname with a colon in it (no surprise!), and this in turn made it impossible to push into a repository at such a path. This has been fixed by introducing a quoting mechanism used when appending such a path to the colon-separated list. * jk/quote-env-path-list-component: t5615-alternate-env: double-quotes in file names do not work on Windows t5547-push-quarantine: run the path separator test on Windows, too tmp-objdir: quote paths we add to alternates alternates: accept double-quoted paths
2016-12-21Merge branch 'vs/submodule-clone-nested-submodules-alternates'Libravatar Junio C Hamano1-0/+66
"git clone --reference $there --recurse-submodules $super" has been taught to guess repositories usable as references for submodules of $super that are embedded in $there while making a clone of the superproject borrow objects from $there; extend the mechanism to also allow submodules of these submodules to borrow repositories embedded in these clones of the submodules embedded in the clone of the superproject. * vs/submodule-clone-nested-submodules-alternates: submodule--helper: set alternateLocation for cloned submodules
2016-12-21Merge branch 'sb/sequencer-abort-safety'Libravatar Junio C Hamano1-0/+10
Unlike "git am --abort", "git cherry-pick --abort" moved HEAD back to where cherry-pick started while picking multiple changes, when the cherry-pick stopped to ask for help from the user, and the user did "git reset --hard" to a different commit in order to re-attempt the operation. * sb/sequencer-abort-safety: Revert "sequencer: remove useless get_dir() function" sequencer: remove useless get_dir() function sequencer: make sequencer abort safer t3510: test that cherry-pick --abort does not unsafely change HEAD am: change safe_to_abort()'s not rewinding error into a warning am: fix filename in safe_to_abort() error message
2016-12-21t5615-alternate-env: double-quotes in file names do not work on WindowsLibravatar Johannes Sixt1-1/+1
Protect a recently added test case with !MINGW. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-19Merge branch 'sb/t3600-cleanup'Libravatar Junio C Hamano1-73/+51
Code cleanup. * sb/t3600-cleanup: t3600: slightly modernize style t3600: remove useless redirect
2016-12-19Merge branch 'jc/pull-rebase-ff'Libravatar Junio C Hamano1-0/+17
"git pull --rebase", when there is no new commits on our side since we forked from the upstream, should be able to fast-forward without invoking "git rebase", but it didn't. * jc/pull-rebase-ff: pull: fast-forward "pull --rebase=true"
2016-12-19Merge branch 'ld/p4-worktree'Libravatar Junio C Hamano2-0/+52
"git p4" didn't interact with the internal of .git directory correctly in the modern "git-worktree"-enabled world. * ld/p4-worktree: git-p4: support git worktrees
2016-12-19Merge branch 'jc/lock-report-on-error'Libravatar Junio C Hamano1-1/+1
Git 2.11 had a minor regression in "merge --ff-only" that competed with another process that simultanously attempted to update the index. We used to explain what went wrong with an error message, but the new code silently failed. The error message has been resurrected. * jc/lock-report-on-error: lockfile: LOCK_REPORT_ON_ERROR hold_locked_index(): align error handling with hold_lockfile_for_update() wt-status: implement opportunisitc index update correctly
2016-12-19Merge branch 'nd/rebase-forget'Libravatar Junio C Hamano1-0/+24
"git rebase" learned "--quit" option, which allows a user to remove the metadata left by an earlier "git rebase" that was manually aborted without using "git rebase --abort". * nd/rebase-forget: rebase: add --quit to cleanup rebase, leave everything else untouched
2016-12-19Merge branch 'jk/trailers-placeholder-in-pretty'Libravatar Junio C Hamano2-0/+51
In addition to %(subject), %(body), "log --pretty=format:..." learned a new placeholder %(trailers). * jk/trailers-placeholder-in-pretty: ref-filter: add support to display trailers as part of contents pretty: add %(trailers) format for displaying trailers of a commit message
2016-12-19Merge branch 'ak/commit-only-allow-empty'Libravatar Junio C Hamano1-0/+9
"git commit --allow-empty --only" (no pathspec) with dirty index ought to be an acceptable way to create a new commit that does not change any paths, but it was forbidden, perhaps because nobody needed it so far. * ak/commit-only-allow-empty: commit: remove 'Clever' message for --only --amend commit: make --only --allow-empty work without paths
2016-12-19Merge branch 'da/difftool-dir-diff-fix'Libravatar Junio C Hamano1-3/+41
"git difftool --dir-diff" had a minor regression when started from a subdirectory, which has been fixed. * da/difftool-dir-diff-fix: difftool: fix dir-diff index creation when in a subdirectory
2016-12-19Merge branch 'jb/diff-no-index-no-abbrev'Libravatar Junio C Hamano7-0/+34
"git diff --no-index" did not take "--no-abbrev" option. * jb/diff-no-index-no-abbrev: diff: handle --no-abbrev in no-index case
2016-12-19Merge branch 'jk/stash-disable-renames-internally'Libravatar Junio C Hamano1-0/+9
When diff.renames configuration is on (and with Git 2.9 and later, it is enabled by default, which made it worse), "git stash" misbehaved if a file is removed and another file with a very similar content is added. * jk/stash-disable-renames-internally: stash: prefer plumbing over git-diff
2016-12-19Merge branch 'jk/http-walker-limit-redirect-2.9'Libravatar Junio C Hamano4-0/+80
Transport with dumb http can be fooled into following foreign URLs that the end user does not intend to, especially with the server side redirects and http-alternates mechanism, which can lead to security issues. Tighten the redirection and make it more obvious to the end user when it happens. * jk/http-walker-limit-redirect-2.9: http: treat http-alternates like redirects http: make redirects more obvious remote-curl: rename shadowed options variable http: always update the base URL for redirects http: simplify update_url_from_redirect
2016-12-19Merge branch 'nd/for-each-ref-ignore-case'Libravatar Junio C Hamano2-0/+56
"git branch --list" and friends learned "--ignore-case" option to optionally sort branches and tags case insensitively. * nd/for-each-ref-ignore-case: tag, branch, for-each-ref: add --ignore-case for sorting and filtering
2016-12-19Merge branch 'sb/unpack-trees-grammofix'Libravatar Junio C Hamano1-1/+1
* sb/unpack-trees-grammofix: unpack-trees: fix grammar for untracked files in directories
2016-12-19Merge branch 'ls/t0021-fixup'Libravatar Junio C Hamano1-3/+2
* ls/t0021-fixup: t0021: minor filter process test cleanup
2016-12-19Merge branch 'jc/renormalize-merge-kill-safer-crlf'Libravatar Junio C Hamano1-0/+12
Fix a corner case in merge-recursive regression that crept in during 2.10 development cycle. * jc/renormalize-merge-kill-safer-crlf: convert: git cherry-pick -Xrenormalize did not work merge-recursive: handle NULL in add_cacheinfo() correctly cherry-pick: demonstrate a segmentation fault
2016-12-19Merge branch 'jt/use-trailer-api-in-commands'Libravatar Junio C Hamano3-8/+81
Commands that operate on a log message and add lines to the trailer blocks, such as "format-patch -s", "cherry-pick (-x|-s)", and "commit -s", have been taught to use the logic of and share the code with "git interpret-trailer". * jt/use-trailer-api-in-commands: sequencer: use trailer's trailer layout trailer: have function to describe trailer layout trailer: avoid unnecessary splitting on lines commit: make ignore_non_trailer take buf/len trailer: be stricter in parsing separators
2016-12-16Merge branch 'ls/p4-empty-file-on-lfs'Libravatar Junio C Hamano1-0/+2
"git p4" LFS support was broken when LFS stores an empty blob. * ls/p4-empty-file-on-lfs: git-p4: fix empty file processing for large file system backend GitLFS
2016-12-16Merge branch 'ld/p4-update-shelve'Libravatar Junio C Hamano1-0/+38
* ld/p4-update-shelve: git-p4: support updating an existing shelved changelist
2016-12-16Merge branch 'vk/p4-submit-shelve'Libravatar Junio C Hamano1-0/+31
* vk/p4-submit-shelve: git-p4: allow submit to create shelved changelists.
2016-12-16Merge branch 'ak/lazy-prereq-mktemp'Libravatar Junio C Hamano1-1/+2
Test code clean-up. * ak/lazy-prereq-mktemp: t7610: clean up foo.XXXXXX tmpdir
2016-12-16Merge branch 'nd/worktree-list-fixup'Libravatar Junio C Hamano1-0/+40
The output from "git worktree list" was made in readdir() order, and was unstable. * nd/worktree-list-fixup: worktree list: keep the list sorted worktree.c: get_worktrees() takes a new flag argument get_worktrees() must return main worktree as first item even on error worktree: reorder an if statement worktree.c: zero new 'struct worktree' on allocation
2016-12-16Merge branch 'bw/push-dry-run'Libravatar Junio C Hamano1-0/+24
"git push --dry-run --recurse-submodule=on-demand" wasn't "--dry-run" in the submodules. * bw/push-dry-run: push: fix --dry-run to not push submodules push: --dry-run updates submodules when --recurse-submodules=on-demand
2016-12-16Merge branch 'dt/empty-submodule-in-merge'Libravatar Junio C Hamano2-5/+2
An empty directory in a working tree that can simply be nuked used to interfere while merging or cherry-picking a change to create a submodule directory there, which has been fixed.. * dt/empty-submodule-in-merge: submodules: allow empty working-tree dirs in merge/cherry-pick
2016-12-16Merge branch 'jk/rev-parse-symbolic-parents-fix'Libravatar Junio C Hamano1-0/+18
"git rev-parse --symbolic" failed with a more recent notation like "HEAD^-1" and "HEAD^!". * jk/rev-parse-symbolic-parents-fix: rev-parse: fix parent shorthands with --symbolic
2016-12-16t: use nongit() function where applicableLibravatar Jeff King3-29/+5
Many tests want to run a command outside of any git repo; with the nongit() function this is now a one-liner. It saves a few lines, but more importantly, it's immediately obvious what the code is trying to accomplish. This doesn't convert every such case in the test suite; it just covers those that want to do a one-off command. Other cases, such as the ones in t4035, are part of a larger scheme of outside-repo files, and it's less confusing for them to stay consistent with the surrounding tests. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-16index-pack: complain when --stdin is used outside of a repoLibravatar Jeff King1-0/+15
The index-pack builtin is marked as RUN_SETUP_GENTLY, because it's perfectly fine to index a pack in the filesystem outside of any repository. However, --stdin mode will write the result to the object database, which does not make sense outside of a repository. Doing so creates a bogus ".git" directory with nothing in it except the newly-created pack and its index. Instead, let's flag this as an error and abort. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-16t5000: extract nongit function to test-lib-functions.shLibravatar Jeff King2-14/+14
This function abstracts the idea of running a command outside of any repository (which is slightly awkward to do because even if you make a non-repo directory, git may keep walking up outside of the trash directory). There are several scripts that use the same technique, so let's make the function available for everyone. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-13git-p4: support git worktreesLibravatar Luke Diamand2-0/+52
git-p4 would attempt to find the git directory using its own specific code, which did not know about git worktrees. Rework it to use "git rev-parse --git-dir" instead. Add test cases for worktree usage and specifying git directory via --git-dir and $GIT_DIR. Signed-off-by: Luke Diamand <luke@diamand.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-13t5547-push-quarantine: run the path separator test on Windows, tooLibravatar Johannes Sixt1-4/+10
To perform the test case on Windows in a way that corresponds to the POSIX version, inject the semicolon in a directory name. Typically, an absolute POSIX style path, such as the one in $PWD, is translated into a Windows style path by bash when it invokes git.exe. However, the presence of the semicolon suppresses this translation; but the untranslated POSIX style path is useless for git.exe. Therefore, instead of $PWD pass the Windows style path that $(pwd) produces. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-12t3600: slightly modernize styleLibravatar Stefan Beller1-73/+51
Remove the space between redirection and file name. Also remove unnecessary invocations of subshells, such as (cd submod && echo X >untracked ) && as there is no point of having the shell for functional purposes. In case of a single Git command use the `-C` option to let Git cd into the directory. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-12tmp-objdir: quote paths we add to alternatesLibravatar Jeff King1-0/+19
Commit 722ff7f87 (receive-pack: quarantine objects until pre-receive accepts, 2016-10-03) regressed pushes to repositories with colon (or semi-colon in Windows in them) because it adds the repository's main object directory to GIT_ALTERNATE_OBJECT_DIRECTORIES. The receiver interprets the colon as a delimiter, not as part of the path, and index-pack is unable to find objects which it needs to resolve deltas. The previous commit introduced a quoting mechanism for the alternates list; let's use it here to cover this case. We'll avoid quoting when we can, though. This alternate setup is also used when calling hooks, so it's possible that the user may call older git implementations which don't understand the quoting mechanism. By quoting only when necessary, this setup will continue to work unless the user _also_ has a repository whose path contains the delimiter. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-12alternates: accept double-quoted pathsLibravatar Jeff King1-0/+18
We read lists of alternates from objects/info/alternates files (delimited by newline), as well as from the GIT_ALTERNATE_OBJECT_DIRECTORIES environment variable (delimited by colon or semi-colon, depending on the platform). There's no mechanism for quoting the delimiters, so it's impossible to specify an alternate path that contains a colon in the environment, or one that contains a newline in a file. We've lived with that restriction for ages because both alternates and filenames with colons are relatively rare, and it's only a problem when the two meet. But since 722ff7f87 (receive-pack: quarantine objects until pre-receive accepts, 2016-10-03), which builds on the alternates system, every push causes the receiver to set GIT_ALTERNATE_OBJECT_DIRECTORIES internally. It would be convenient to have some way to quote the delimiter so that we can represent arbitrary paths. The simplest thing would be an escape character before a quoted delimiter (e.g., "\:" as a literal colon). But that creates a backwards compatibility problem: any path which uses that escape character is now broken, and we've just shifted the problem. We could choose an unlikely escape character (e.g., something from the non-printable ASCII range), but that's awkward to use. Instead, let's treat names as unquoted unless they begin with a double-quote, in which case they are interpreted via our usual C-stylke quoting rules. This also breaks backwards-compatibility, but in a smaller way: it only matters if your file has a double-quote as the very _first_ character in the path (whereas an escape character is a problem anywhere in the path). It's also consistent with many other parts of git, which accept either a bare pathname or a double-quoted one, and the sender can choose to quote or not as required. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-12Merge branch 'jk/alt-odb-cleanup' into jk/quote-env-path-list-componentLibravatar Junio C Hamano1-0/+71
* jk/alt-odb-cleanup: alternates: re-allow relative paths from environment
2016-12-12submodule--helper: set alternateLocation for cloned submodulesLibravatar Vitaly "_Vi" Shukela1-0/+66
In 31224cbdc7 (clone: recursive and reference option triggers submodule alternates, 2016-08-17) a mechanism was added to have submodules referenced. It did not address _nested_ submodules, however. This patch makes all not just the root repository, but also all submodules (recursively) have submodule.alternateLocation and submodule.alternateErrorStrategy configured, making Git search for possible alternates for nested submodules as well. As submodule's alternate target does not end in .git/objects (rather .git/modules/qqqqqq/objects), this alternate target path restriction for in add_possible_reference_from_superproject relates from "*.git/objects" to just */objects". New tests have been added to t7408-submodule-reference. Signed-off-by: Vitaly _Vi Shukela <vi0oss@gmail.com> Reviewed-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-11ref-filter: add support to display trailers as part of contentsLibravatar Jacob Keller1-0/+26
Add %(trailers) and %(contents:trailers) to display the trailers as interpreted by trailer_info_get. Update documentation and add a test for the new feature. Signed-off-by: Jacob Keller <jacob.keller@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-11pretty: add %(trailers) format for displaying trailers of a commit messageLibravatar Jacob Keller1-0/+26
Recent patches have expanded on the trailers.c code and we have the builtin commant git-interpret-trailers which can be used to add or modify trailer lines. However, there is no easy way to simply display the trailers of a commit message. Add support for %(trailers) format modifier which will use the trailer_info_get() calls to read trailers in an identical way as git interpret-trailers does. Use a long format option instead of a short name so that future work can more easily unify ref-filter and pretty formats. Add documentation and tests for the same. Signed-off-by: Jacob Keller <jacob.keller@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-11rebase: add --quit to cleanup rebase, leave everything else untouchedLibravatar Nguyễn Thái Ngọc Duy1-0/+24
There are occasions when you decide to abort an in-progress rebase and move on to do something else but you forget to do "git rebase --abort" first. Or the rebase has been in progress for so long you forgot about it. By the time you realize that (e.g. by starting another rebase) it's already too late to retrace your steps. The solution is normally rm -r .git/<some rebase dir> and continue with your life. But there could be two different directories for <some rebase dir> (and it obviously requires some knowledge of how rebase works), and the ".git" part could be much longer if you are not at top-dir, or in a linked worktree. And "rm -r" is very dangerous to do in .git, a mistake in there could destroy object database or other important data. Provide "git rebase --quit" for this use case, mimicking a precedent that is "git cherry-pick --quit". Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-09sequencer: make sequencer abort saferLibravatar Stephan Beyer1-1/+1
In contrast to "git am --abort", a sequencer abort did not check whether the current HEAD is the one that is expected. This can lead to loss of work (when not spotted and resolved using reflog before the garbage collector chimes in). This behavior is now changed by mimicking "git am --abort". The abortion is done but HEAD is not changed when the current HEAD is not the expected HEAD. A new file "sequencer/abort-safety" is added to save the expected HEAD. The new behavior is only active when --abort is invoked on multiple picks. The problem does not occur for the single-pick case because it is handled differently. Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-09t3510: test that cherry-pick --abort does not unsafely change HEADLibravatar Stephan Beyer1-0/+10
Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-08diff: handle --no-abbrev in no-index caseLibravatar Jack Bates7-0/+34
There are two different places where the --no-abbrev option is parsed, and two different places where SHA-1s are abbreviated. We normally parse --no-abbrev with setup_revisions(), but in the no-index case, "git diff" calls diff_opt_parse() directly, and diff_opt_parse() didn't handle --no-abbrev until now. (It did handle --abbrev, however.) We normally abbreviate SHA-1s with find_unique_abbrev(), but commit 4f03666 ("diff: handle sha1 abbreviations outside of repository, 2016-10-20) recently introduced a special case when you run "git diff" outside of a repository. setup_revisions() does also call diff_opt_parse(), but not for --abbrev or --no-abbrev, which it handles itself. setup_revisions() sets rev_info->abbrev, and later copies that to diff_options->abbrev. It handles --no-abbrev by setting abbrev to zero. (This change doesn't touch that.) Setting abbrev to zero was broken in the outside-of-a-repository special case, which until now resulted in a truly zero-length SHA-1, rather than taking zero to mean do not abbreviate. The only way to trigger this bug, however, was by running "git diff --raw" without either the --abbrev or --no-abbrev options, because 1) without --raw it doesn't respect abbrev (which is bizarre, but has been that way forever), 2) we silently clamp --abbrev=0 to MINIMUM_ABBREV, and 3) --no-abbrev wasn't handled until now. The outside-of-a-repository case is one of three no-index cases. The other two are when one of the files you're comparing is outside of the repository you're in, and the --no-index option. Signed-off-by: Jack Bates <jack@nottheoilrig.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-08difftool: fix dir-diff index creation when in a subdirectoryLibravatar David Aguilar1-3/+41
9ec26e7977 (difftool: fix argument handling in subdirs, 2016-07-18) corrected how path arguments are handled in a subdirectory, but it introduced a regression in how entries outside of the subdirectory are handled by dir-diff. When preparing the right-side of the diff we only include the changed paths in the temporary area. The left side of the diff is constructed from a temporary index that is built from the same set of changed files, but it was being constructed from within the subdirectory. This is a problem because the indexed paths are toplevel-relative, and thus they were not getting added to the index. Teach difftool to chdir to the toplevel of the repository before preparing its temporary indexes. This ensures that all of the toplevel-relative paths are valid. Add test cases to more thoroughly exercise this scenario. Reported-by: Frank Becker <fb@mooflu.com> Signed-off-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-07hold_locked_index(): align error handling with hold_lockfile_for_update()Libravatar Junio C Hamano1-1/+1
Callers of the hold_locked_index() function pass 0 when they want to prepare to write a new version of the index file without wishing to die or emit an error message when the request fails (e.g. somebody else already held the lock), and pass 1 when they want the call to die upon failure. This option is called LOCK_DIE_ON_ERROR by the underlying lockfile API, and the hold_locked_index() function translates the paramter to LOCK_DIE_ON_ERROR when calling the hold_lock_file_for_update(). Replace these hardcoded '1' with LOCK_DIE_ON_ERROR and stop translating. Callers other than the ones that are replaced with this change pass '0' to the function; no behaviour change is intended with this patch. Signed-off-by: Junio C Hamano <gitster@pobox.com> --- Among the callers of hold_locked_index() that passes 0: - diff.c::refresh_index_quietly() at the end of "git diff" is an opportunistic update; it leaks the lockfile structure but it is just before the program exits and nobody should care. - builtin/describe.c::cmd_describe(), builtin/commit.c::cmd_status(), sequencer.c::read_and_refresh_cache() are all opportunistic updates and they are OK. - builtin/update-index.c::cmd_update_index() takes a lock upfront but we may end up not needing to update the index (i.e. the entries may be fully up-to-date), in which case we do not need to issue an error upon failure to acquire the lock. We do diagnose and die if we indeed need to update, so it is OK. - wt-status.c::require_clean_work_tree() IS BUGGY. It asks silence, does not check the returned value. Compare with callsites like cmd_describe() and cmd_status() to notice that it is wrong to call update_index_if_able() unconditionally.
2016-12-06stash: prefer plumbing over git-diffLibravatar Jeff King1-0/+9
When creating a stash, we need to look at the diff between the working tree and HEAD, and do so using the git-diff porcelain. Because git-diff enables porcelain config like renames by default, this causes at least one problem. The --name-only format will not mention the source side of a rename, meaning we will fail to stash a deletion that is part of a rename. We could fix that case by passing --no-renames, but this is a symptom of a larger problem. We should be using the diff-index plumbing here, which does not have renames enabled by default, and also does not respect any potentially confusing config options. Reported-by: Matthew Patey <matthew.patey2167@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-06http: treat http-alternates like redirectsLibravatar Jeff King1-0/+38
The previous commit made HTTP redirects more obvious and tightened up the default behavior. However, there's another way for a server to ask a git client to fetch arbitrary content: by having an http-alternates file (or a regular alternates file, which is used as a backup). Similar to the HTTP redirect case, a malicious server can claim to have refs pointing at object X, return a 404 when the client asks for X, but point to some other URL via http-alternates, which the client will transparently fetch. The end result is that it looks from the user's perspective like the objects came from the malicious server, as the other URL is not mentioned at all. Worse, because we feed the new URL to curl ourselves, the usual protocol restrictions do not kick in (neither curl's default of disallowing file://, nor the protocol whitelisting in f4113cac0 (http: limit redirection to protocol-whitelist, 2015-09-22). Let's apply the same rules here as we do for HTTP redirects. Namely: - unless http.followRedirects is set to "always", we will not follow remote redirects from http-alternates (or alternates) at all - set CURLOPT_PROTOCOLS alongside CURLOPT_REDIR_PROTOCOLS restrict ourselves to a known-safe set and respect any user-provided whitelist. - mention alternate object stores on stderr so that the user is aware another source of objects may be involved The first item may prove to be too restrictive. The most common use of alternates is to point to another path on the same server. While it's possible for a single-server redirect to be an attack, it takes a fairly obscure setup (victim and evil repository on the same host, host speaks dumb http, and evil repository has access to edit its own http-alternates file). So we could make the checks more specific, and only cover cross-server redirects. But that means parsing the URLs ourselves, rather than letting curl handle them. This patch goes for the simpler approach. Given that they are only used with dumb http, http-alternates are probably pretty rare. And there's an escape hatch: the user can allow redirects on a specific server by setting http.<url>.followRedirects to "always". Reported-by: Jann Horn <jannh@google.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-12-06http: make redirects more obviousLibravatar Jeff King2-0/+29
We instruct curl to always follow HTTP redirects. This is convenient, but it creates opportunities for malicious servers to create confusing situations. For instance, imagine Alice is a git user with access to a private repository on Bob's server. Mallory runs her own server and wants to access objects from Bob's repository. Mallory may try a few tricks that involve asking Alice to clone from her, build on top, and then push the result: 1. Mallory may simply redirect all fetch requests to Bob's server. Git will transparently follow those redirects and fetch Bob's history, which Alice may believe she got from Mallory. The subsequent push seems like it is just feeding Mallory back her own objects, but is actually leaking Bob's objects. There is nothing in git's output to indicate that Bob's repository was involved at all. The downside (for Mallory) of this attack is that Alice will have received Bob's entire repository, and is likely to notice that when building on top of it. 2. If Mallory happens to know the sha1 of some object X in Bob's repository, she can instead build her own history that references that object. She then runs a dumb http server, and Alice's client will fetch each object individually. When it asks for X, Mallory redirects her to Bob's server. The end result is that Alice obtains objects from Bob, but they may be buried deep in history. Alice is less likely to notice. Both of these attacks are fairly hard to pull off. There's a social component in getting Mallory to convince Alice to work with her. Alice may be prompted for credentials in accessing Bob's repository (but not always, if she is using a credential helper that caches). Attack (1) requires a certain amount of obliviousness on Alice's part while making a new commit. Attack (2) requires that Mallory knows a sha1 in Bob's repository, that Bob's server supports dumb http, and that the object in question is loose on Bob's server. But we can probably make things a bit more obvious without any loss of functionality. This patch does two things to that end. First, when we encounter a whole-repo redirect during the initial ref discovery, we now inform the user on stderr, making attack (1) much more obvious. Second, the decision to follow redirects is now configurable. The truly paranoid can set the new http.followRedirects to false to avoid any redirection entirely. But for a more practical default, we will disallow redirects only after the initial ref discovery. This is enough to thwart attacks similar to (2), while still allowing the common use of redirects at the repository level. Since c93c92f30 (http: update base URLs when we see redirects, 2013-09-28) we re-root all further requests from the redirect destination, which should generally mean that no further redirection is necessary. As an escape hatch, in case there really is a server that needs to redirect individual requests, the user can set http.followRedirects to "true" (and this can be done on a per-server basis via http.*.followRedirects config). Reported-by: Jann Horn <jannh@google.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>