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2015-05-26Merge branch 'pt/pull-log-n'Libravatar Junio C Hamano1-0/+17
"git pull --log" and "git pull --no-log" worked as expected, but "git pull --log=20" did not. * pt/pull-log-n: pull: handle --log=<n>
2015-05-22Merge branch 'sb/t1020-cleanup'Libravatar Junio C Hamano1-4/+7
There was a commented-out (instead of being marked to expect failure) test that documented a breakage that was fixed since the test was written; turn it into a proper test. * sb/t1020-cleanup: subdirectory tests: code cleanup, uncomment test
2015-05-22Merge branch 'jc/ignore-epipe-in-filter'Libravatar Junio C Hamano1-0/+10
Filter scripts were run with SIGPIPE disabled on the Git side, expecting that they may not read what Git feeds them to filter. We however treated a filter that does not read its input fully before exiting as an error. This changes semantics, but arguably in a good way. If a filter can produce its output without consuming its input using whatever magic, we now let it do so, instead of diagnosing it as a programming error. * jc/ignore-epipe-in-filter: filter_buffer_or_fd(): ignore EPIPE copy.c: make copy_fd() report its status silently
2015-05-22Merge branch 'mh/lockfile-retry'Libravatar Junio C Hamano1-0/+17
Instead of dying immediately upon failing to obtain a lock, retry after a short while with backoff. * mh/lockfile-retry: lock_packed_refs(): allow retries when acquiring the packed-refs lock lockfile: allow file locking to be retried with a timeout
2015-05-22Merge branch 'jk/add-e-kill-editor'Libravatar Junio C Hamano1-0/+7
"git add -e" did not allow the user to abort the operation by killing the editor. * jk/add-e-kill-editor: add: check return value of launch_editor
2015-05-22Merge branch 'sg/completion-config'Libravatar Junio C Hamano1-0/+34
Code clean-up for completion script (in contrib/). * sg/completion-config: completion: simplify query for config variables completion: add a helper function to get config variables
2015-05-22Merge branch 'mh/ref-directory-file'Libravatar Junio C Hamano2-7/+114
The ref API did not handle cases where 'refs/heads/xyzzy/frotz' is removed at the same time as 'refs/heads/xyzzy' is added (or vice versa) very well. * mh/ref-directory-file: reflog_expire(): integrate lock_ref_sha1_basic() errors into ours ref_transaction_commit(): delete extra "the" from error message ref_transaction_commit(): provide better error messages rename_ref(): integrate lock_ref_sha1_basic() errors into ours lock_ref_sha1_basic(): improve diagnostics for ref D/F conflicts lock_ref_sha1_basic(): report errors via a "struct strbuf *err" verify_refname_available(): report errors via a "struct strbuf *err" verify_refname_available(): rename function refs: check for D/F conflicts among refs created in a transaction ref_transaction_commit(): use a string_list for detecting duplicates is_refname_available(): use dirname in first loop struct nonmatching_ref_data: store a refname instead of a ref_entry report_refname_conflict(): inline function entry_matches(): inline function is_refname_available(): convert local variable "dirname" to strbuf is_refname_available(): avoid shadowing "dir" variable is_refname_available(): revamp the comments t1404: new tests of ref D/F conflicts within transactions
2015-05-22Merge branch 'mh/write-refs-sooner-2.4'Libravatar Junio C Hamano2-2/+30
Multi-ref transaction support we merged a few releases ago unnecessarily kept many file descriptors open, risking to fail with resource exhaustion. This is for 2.4.x track. * mh/write-refs-sooner-2.4: ref_transaction_commit(): fix atomicity and avoid fd exhaustion ref_transaction_commit(): remove the local flags variable ref_transaction_commit(): inline call to write_ref_sha1() rename_ref(): inline calls to write_ref_sha1() from this function commit_ref_update(): new function, extracted from write_ref_sha1() write_ref_to_lockfile(): new function, extracted from write_ref_sha1() t7004: rename ULIMIT test prerequisite to ULIMIT_STACK_SIZE update-ref: test handling large transactions properly ref_transaction_commit(): fix atomicity and avoid fd exhaustion ref_transaction_commit(): remove the local flags variable ref_transaction_commit(): inline call to write_ref_sha1() rename_ref(): inline calls to write_ref_sha1() from this function commit_ref_update(): new function, extracted from write_ref_sha1() write_ref_to_lockfile(): new function, extracted from write_ref_sha1() t7004: rename ULIMIT test prerequisite to ULIMIT_STACK_SIZE update-ref: test handling large transactions properly
2015-05-22Merge branch 'mg/log-decorate-HEAD'Libravatar Junio C Hamano1-1/+1
The "log --decorate" enhancement in Git 2.4 that shows the commit at the tip of the current branch e.g. "HEAD -> master", did not work with --decorate=full. * mg/log-decorate-HEAD: log: do not shorten decoration names too early log: decorate HEAD with branch name under --decorate=full, too
2015-05-22Merge branch 'jk/skip-http-tests-under-no-curl'Libravatar Junio C Hamano7-35/+12
Test clean-up. * jk/skip-http-tests-under-no-curl: tests: skip dav http-push tests under NO_EXPAT=NoThanks t/lib-httpd.sh: skip tests if NO_CURL is defined
2015-05-20filter_buffer_or_fd(): ignore EPIPELibravatar Junio C Hamano1-0/+10
We are explicitly ignoring SIGPIPE, as we fully expect that the filter program may not read our output fully. Ignore EPIPE that may come from writing to it as well. A new test was stolen from Jeff's suggestion. Helped-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-19Merge branch 'kn/cat-file-literally'Libravatar Junio C Hamano1-0/+45
Add the "--allow-unknown-type" option to "cat-file" to allow inspecting loose objects of an experimental or a broken type. * kn/cat-file-literally: t1006: add tests for git cat-file --allow-unknown-type cat-file: teach cat-file a '--allow-unknown-type' option cat-file: make the options mutually exclusive sha1_file: support reading from a loose object of unknown type
2015-05-19Merge branch 'jc/merge'Libravatar Junio C Hamano6-22/+157
"git merge FETCH_HEAD" learned that the previous "git fetch" could be to create an Octopus merge, i.e. recording multiple branches that are not marked as "not-for-merge"; this allows us to lose an old style invocation "git merge <msg> HEAD $commits..." in the implementation of "git pull" script; the old style syntax can now be deprecated. * jc/merge: merge: deprecate 'git merge <message> HEAD <commit>' syntax merge: handle FETCH_HEAD internally merge: decide if we auto-generate the message early in collect_parents() merge: make collect_parents() auto-generate the merge message merge: extract prepare_merge_message() logic out merge: narrow scope of merge_names merge: split reduce_parents() out of collect_parents() merge: clarify collect_parents() logic merge: small leakfix and code simplification merge: do not check argc to determine number of remote heads merge: clarify "pulling into void" special case t5520: test pulling an octopus into an unborn branch t5520: style fixes merge: simplify code flow merge: test the top-level merge driver
2015-05-19Merge branch 'ph/rebase-i-redo'Libravatar Junio C Hamano1-0/+47
"git rebase -i" moved the "current" command from "todo" to "done" a bit too prematurely, losing a step when a "pick" did not even start. * ph/rebase-i-redo: rebase -i: redo tasks that die during cherry-pick
2015-05-19Merge branch 'jc/test-prereq-validate'Libravatar Junio C Hamano1-0/+9
Help us to find broken test script that splits the body part of the test by mistaken use of wrong kind of quotes. * jc/test-prereq-validate: test: validate prerequistes syntax
2015-05-19Merge branch 'bc/connect-plink'Libravatar Junio C Hamano1-1/+34
The connection initiation code for "ssh" transport tried to absorb differences between the stock "ssh" and Putty-supplied "plink" and its derivatives, but the logic to tell that we are using "plink" variants were too loose and falsely triggered when "plink" appeared anywhere in the path (e.g. "/home/me/bin/uplink/ssh"). * bc/connect-plink: connect: improve check for plink to reduce false positives t5601: fix quotation error leading to skipped tests connect: simplify SSH connection code path
2015-05-19Merge branch 'jk/test-chain-lint'Libravatar Junio C Hamano2-2/+2
Developer support to automatically detect broken &&-chain in the test scripts is now turned on by default. * jk/test-chain-lint: test-lib: turn on GIT_TEST_CHAIN_LINT by default t7502-commit.sh: fix a broken and-chain
2015-05-19Merge branch 'jk/stash-require-clean-index'Libravatar Junio C Hamano1-7/+14
"git stash pop/apply" forgot to make sure that not just the working tree is clean but also the index is clean. The latter is important as a stash application can conflict and the index will be used for conflict resolution. * jk/stash-require-clean-index: stash: require a clean index to apply t3903: avoid applying onto dirty index t3903: stop hard-coding commit sha1s
2015-05-19Merge branch 'jc/gitignore-precedence'Libravatar Junio C Hamano1-0/+10
core.excludesfile (defaulting to $XDG_HOME/git/ignore) is supposed to be overridden by repository-specific .git/info/exclude file, but the order was swapped from the beginning. This belatedly fixes it. * jc/gitignore-precedence: ignore: info/exclude should trump core.excludesfile
2015-05-19Merge branch 'nd/diff-i-t-a'Libravatar Junio C Hamano2-8/+25
After "git add -N", the path appeared in output of "git diff HEAD" and "git diff --cached HEAD", leading "git status" to classify it as "Changes to be committed". Such a path, however, is not yet to be scheduled to be committed. "git diff" showed the change to the path as modification, not as a "new file", in the header of its output. Treat such paths as "yet to be added to the index but Git already know about them"; "git diff HEAD" and "git diff --cached HEAD" should not talk about them, and "git diff" should show them as new files yet to be added to the index. * nd/diff-i-t-a: diff-lib.c: adjust position of i-t-a entries in diff
2015-05-18subdirectory tests: code cleanup, uncomment testLibravatar Stefan Beller1-4/+7
Back when these tests were written, we wanted to make sure that Git notices it is in a bare repository and "git show -s HEAD" would refrain from complaining that HEAD might mean a file it sees in its current working directory (because it does not). But the version of Git back then didn't behave well, without (doubly) being told that it is inside a bare repository by exporting "GIT_DIR=.". The form of the test we originally wanted to have was left commented out as a reminder. Nowadays the test as originally intended works, so add it to the test suite. We'll keep the old test that explicitly sets GIT_DIR=. to make sure that use case will not regress. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-18pull: handle --log=<n>Libravatar Paul Tan1-0/+17
Since efb779f (merge, pull: add '--(no-)log' command line option, 2008-04-06) git-pull supported the (--no-)log switch and would pass it to git-merge. 96e9420 (merge: Make '--log' an integer option for number of shortlog entries, 2010-09-08) implemented support for the --log=<n> switch, which would explicitly set the number of shortlog entries. However, git-pull does not recognize this option, and will instead pass it to git-fetch, leading to "unknown option" errors. Fix this by matching --log=* in addition to --log and --no-log. Implement a test for this use case. Signed-off-by: Paul Tan <pyokagan@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-14lock_packed_refs(): allow retries when acquiring the packed-refs lockLibravatar Michael Haggerty1-0/+17
Currently, there is only one attempt to acquire any lockfile, and if the lock is held by another process, the locking attempt fails immediately. This is not such a limitation for loose reference files. First, they don't take long to rewrite. Second, most reference updates have a known "old" value, so if another process is updating a reference at the same moment that we are trying to lock it, then probably the expected "old" value will not longer be valid, and the update will fail anyway. But these arguments do not hold for packed-refs: * The packed-refs file can be large and take significant time to rewrite. * Many references are stored in a single packed-refs file, so it could be that the other process was changing a different reference than the one that we are interested in. Therefore, it is much more likely for there to be spurious lock conflicts in connection to the packed-refs file, resulting in unnecessary command failures. So, if the first attempt to lock the packed-refs file fails, continue retrying for a configurable length of time before giving up. The default timeout is 1 second. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-13log: decorate HEAD with branch name under --decorate=full, tooLibravatar Junio C Hamano1-1/+1
The previous step to teach "log --decorate" to show "HEAD -> master" instead of "HEAD, master" when showing the commit at the tip of the 'master' branch, when the 'master' branch is checked out, did not work for "log --decorate=full". The commands in the "log" family prepare commit decorations for all refs upfront, and the actual string used in a decoration depends on how load_ref_decorations() is called very early in the process. By default, "git log --decorate" stores names with common prefixes such as "refs/heads" stripped; "git log --decorate=full" stores the full refnames. When the current_pointed_by_HEAD() function has to decide if "HEAD" points at the branch a decoration describes, however, what was passed to load_ref_decorations() to decide to strip (or keep) such a common prefix is long lost. This makes it impossible to reliably tell if a decoration that stores "refs/heads/master", for example, is the 'master' branch (under "--decorate" with prefix omitted) or 'refs/heads/master' branch (under "--decorate=full"). Keep what was passed to load_ref_decorations() in a global next to the global variable name_decoration, and use that to decide how to match what was read from "HEAD" and what is in a decoration. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-12ref_transaction_commit(): fix atomicity and avoid fd exhaustionLibravatar Michael Haggerty1-2/+2
The old code was roughly for update in updates: acquire locks and check old_sha for update in updates: if changing value: write_ref_to_lockfile() commit_ref_update() for update in updates: if deleting value: unlink() rewrite packed-refs file for update in updates: if reference still locked: unlock_ref() This has two problems. Non-atomic updates ================== The atomicity of the reference transaction depends on all pre-checks being done in the first loop, before any changes have started being committed in the second loop. The problem is that write_ref_to_lockfile() (previously part of write_ref_sha1()), which is called from the second loop, contains two more checks: * It verifies that new_sha1 is a valid object * If the reference being updated is a branch, it verifies that new_sha1 points at a commit object (as opposed to a tag, tree, or blob). If either of these checks fails, the "transaction" is aborted during the second loop. But this might happen after some reference updates have already been permanently committed. In other words, the all-or-nothing promise of "git update-ref --stdin" could be violated. So these checks have to be moved to the first loop. File descriptor exhaustion ========================== The old code locked all of the references in the first loop, leaving all of the lockfiles open until later loops. Since we might be updating a lot of references, this could result in file descriptor exhaustion. The solution ============ After this patch, the code looks like for update in updates: acquire locks and check old_sha if changing value: write_ref_to_lockfile() else: close_ref() for update in updates: if changing value: commit_ref_update() for update in updates: if deleting value: unlink() rewrite packed-refs file for update in updates: if reference still locked: unlock_ref() This fixes both problems: 1. The pre-checks in write_ref_to_lockfile() are now done in the first loop, before any changes have been committed. If any of the checks fails, the whole transaction can now be rolled back correctly. 2. All lockfiles are closed in the first loop immediately after they are created (either by write_ref_to_lockfile() or by close_ref()). This means that there is never more than one open lockfile at a time, preventing file descriptor exhaustion. To simplify the bookkeeping across loops, add a new REF_NEEDS_COMMIT bit to update->flags, which keeps track of whether the corresponding lockfile needs to be committed, as opposed to just unlocked. (Since "struct ref_update" is internal to the refs module, this change is not visible to external callers.) This change fixes two tests in t1400. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-12t7004: rename ULIMIT test prerequisite to ULIMIT_STACK_SIZELibravatar Stefan Beller1-2/+2
During creation of the patch series our discussion we could have a more descriptive name for the prerequisite for the test so it stays unique when other limits of ulimit are introduced. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-12update-ref: test handling large transactions properlyLibravatar Stefan Beller1-0/+28
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-12add: check return value of launch_editorLibravatar Jeff King1-0/+7
When running "add -e", if launching the editor fails, we do not notice and continue as if the output is what the user asked for. The likely case is that the editor did not touch the contents at all, and we end up adding everything. Reported-by: Russ Cox <rsc@golang.org> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-12completion: simplify query for config variablesLibravatar SZEDER Gábor1-0/+12
To get the name of all config variables in a given section we perform a 'git config --get-regex' query for all config variables containing the name of that section, and then filter its output through a case statement to throw away those that though contain but don't start with the given section. Modify the regex to match only at the beginning, so the case statement becomes unnecessary and we can get rid of it. Add a test to check that a match in the middle doesn't fool us. Signed-off-by: SZEDER Gábor <szeder@ira.uka.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-12completion: add a helper function to get config variablesLibravatar SZEDER Gábor1-0/+22
Currently there are a few completion functions that perform similar 'git config' queries and filtering to get config variable names: the completion of pretty aliases, aliases, and remote groups for 'git remote update'. Unify those 'git config' queries in a helper function to eliminate code duplication. Though the helper functions to get pretty aliases and alieses are reduced to mere one-liner wrappers around the newly added function, keep these helpers still, because users' completion functions out there might depend on them. And they keep their callers a tad easier to read, too. Add tests for the pretty alias and alias helper to show that they work as before; not for the remote groups query, though, because that's not extracted into a helper function and it's not worth the effort to do so for a sole callsite. Signed-off-by: SZEDER Gábor <szeder@ira.uka.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-11Merge branch 'mm/usage-log-l-can-take-regex' into maint-2.3Libravatar Junio C Hamano1-4/+4
Documentation fix. * mm/usage-log-l-can-take-regex: log -L: improve error message on malformed argument Documentation: change -L:<regex> to -L:<funcname>
2015-05-11Merge branch 'jc/diff-no-index-d-f' into maint-2.3Libravatar Junio C Hamano1-0/+34
The usual "git diff" when seeing a file turning into a directory showed a patchset to remove the file and create all files in the directory, but "git diff --no-index" simply refused to work. Also, when asked to compare a file and a directory, imitate POSIX "diff" and compare the file with the file with the same name in the directory, instead of refusing to run. * jc/diff-no-index-d-f: diff-no-index: align D/F handling with that of normal Git diff-no-index: DWIM "diff D F" into "diff D/F F"
2015-05-11Merge branch 'jc/hash-object'Libravatar Junio C Hamano1-0/+11
"hash-object --literally" introduced in v2.2 was not prepared to take a really long object type name. * jc/hash-object: write_sha1_file(): do not use a separate sha1[] array t1007: add hash-object --literally tests hash-object --literally: fix buffer overrun with extra-long object type git-hash-object.txt: document --literally option
2015-05-11Merge branch 'jk/filter-branch-use-of-sed-on-incomplete-line'Libravatar Junio C Hamano1-0/+10
"filter-branch" corrupted commit log message that ends with an incomplete line on platforms with some "sed" implementations that munge such a line. Work it around by avoiding to use "sed". * jk/filter-branch-use-of-sed-on-incomplete-line: filter-branch: avoid passing commit message through sed
2015-05-11Merge branch 'tb/blame-resurrect-convert-to-git'Libravatar Junio C Hamano1-3/+15
Some time ago, "git blame" (incorrectly) lost the convert_to_git() call when synthesizing a fake "tip" commit that represents the state in the working tree, which broke folks who record the history with LF line ending to make their project portabile across platforms while terminating lines in their working tree files with CRLF for their platform. * tb/blame-resurrect-convert-to-git: blame: CRLF in the working tree and LF in the repo
2015-05-11Merge branch 'va/fix-git-p4-tests'Libravatar Junio C Hamano1-8/+3
* va/fix-git-p4-tests: git-p4: t9814: prevent --chain-lint failure
2015-05-11Merge branch 'ld/p4-case-fold'Libravatar Junio C Hamano2-1/+55
* ld/p4-case-fold: git-p4: add failing tests for case-folding p4d
2015-05-11Merge branch 'va/p4-client-path'Libravatar Junio C Hamano1-0/+106
git p4 attempts to better handle branches in Perforce. * va/p4-client-path: git-p4: improve client path detection when branches are used t9801: check git-p4's branch detection with client spec enabled
2015-05-11Merge branch 'mm/add-p-split-error'Libravatar Junio C Hamano2-11/+59
When "add--interactive" splits a hunk into two overlapping hunks and then let the user choose only one, it sometimes feeds an incorrect patch text to "git apply". Add tests to demonstrate this. I have a slight suspicion that this may be $gmane/87202 coming back and biting us (I seem to have said "let's run with this and see what happens" back then). * mm/add-p-split-error: stash -p: demonstrate failure of split with mixed y/n t3904-stash-patch: factor PERL prereq at the top of the file t3904-stash-patch: fix test description add -p: demonstrate failure when running 'edit' after a split t3701-add-interactive: simplify code
2015-05-11Merge branch 'tb/t0027-crlf'Libravatar Junio C Hamano1-109/+134
More line-ending tests. * tb/t0027-crlf: t0027: Add repoMIX and LF_nul t0027: support NATIVE_CRLF platforms t0027: cleanup: rename functions; avoid non-leading TABs
2015-05-11Merge branch 'ls/p4-changes-block-size'Libravatar Junio C Hamano1-0/+64
"git p4" learned "--changes-block-size <n>" to read the changes in chunks from Perforce, instead of making one call to "p4 changes" that may trigger "too many rows scanned" error from Perforce. * ls/p4-changes-block-size: git-p4: use -m when running p4 changes
2015-05-11Merge branch 'jk/reading-packed-refs'Libravatar Junio C Hamano1-0/+8
An earlier rewrite to use strbuf_getwholeline() instead of fgets(3) to read packed-refs file revealed that the former is unacceptably inefficient. * jk/reading-packed-refs: t1430: add another refs-escape test read_packed_refs: avoid double-checking sane refs strbuf_getwholeline: use getdelim if it is available strbuf_getwholeline: avoid calling strbuf_grow strbuf_addch: avoid calling strbuf_grow config: use getc_unlocked when reading from file strbuf_getwholeline: use getc_unlocked git-compat-util: add fallbacks for unlocked stdio strbuf_getwholeline: use getc macro
2015-05-11Merge branch 'nd/multiple-work-trees'Libravatar Junio C Hamano6-0/+389
A replacement for contrib/workdir/git-new-workdir that does not rely on symbolic links and make sharing of objects and refs safer by making the borrowee and borrowers aware of each other. * nd/multiple-work-trees: (41 commits) prune --worktrees: fix expire vs worktree existence condition t1501: fix test with split index t2026: fix broken &&-chain t2026 needs procondition SANITY git-checkout.txt: a note about multiple checkout support for submodules checkout: add --ignore-other-wortrees checkout: pass whole struct to parse_branchname_arg instead of individual flags git-common-dir: make "modules/" per-working-directory directory checkout: do not fail if target is an empty directory t2025: add a test to make sure grafts is working from a linked checkout checkout: don't require a work tree when checking out into a new one git_path(): keep "info/sparse-checkout" per work-tree count-objects: report unused files in $GIT_DIR/worktrees/... gc: support prune --worktrees gc: factor out gc.pruneexpire parsing code gc: style change -- no SP before closing parenthesis checkout: clean up half-prepared directories in --to mode checkout: reject if the branch is already checked out elsewhere prune: strategies for linked checkouts checkout: support checking out into a new working directory ...
2015-05-11Merge branch 'pt/credential-xdg'Libravatar Junio C Hamano1-0/+114
Tweak the sample "store" backend of the credential helper to honor XDG configuration file locations when specified. * pt/credential-xdg: t0302: "unreadable" test needs POSIXPERM t0302: test credential-store support for XDG_CONFIG_HOME git-credential-store: support XDG_CONFIG_HOME git-credential-store: support multiple credential files
2015-05-11ref_transaction_commit(): delete extra "the" from error messageLibravatar Michael Haggerty1-7/+7
While we are in the area, let's remove a superfluous definite article from the error message that is emitted when the reference cannot be locked. This improves how it reads and makes it a bit shorter. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
2015-05-11lock_ref_sha1_basic(): improve diagnostics for ref D/F conflictsLibravatar Michael Haggerty1-4/+4
If there is a failure to lock a reference that is likely caused by a D/F conflict (e.g., trying to lock "refs/foo/bar" when reference "refs/foo" already exists), invoke verify_refname_available() to try to generate a more helpful error message. That function might not detect an error. For example, some non-reference file might be blocking the deletion of an otherwise-empty directory tree, or there might be a race with another process that just deleted the offending reference. In such cases, generate the strerror-based error message like before. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
2015-05-11refs: check for D/F conflicts among refs created in a transactionLibravatar Michael Haggerty1-1/+1
If two references that D/F conflict (e.g., "refs/foo" and "refs/foo/bar") are created in a single transaction, the old code discovered the problem only after the "commit" phase of ref_transaction_commit() had already begun. This could leave some references updated and others not, which violates the promise of atomicity. Instead, check for such conflicts during the "locking" phase: * Teach is_refname_available() to take an "extras" parameter that can contain extra reference names with which the specified refname must not conflict. * Change lock_ref_sha1_basic() to take an "extras" parameter, which it passes through to is_refname_available(). * Change ref_transaction_commit() to pass "affected_refnames" to lock_ref_sha1_basic() as its "extras" argument. This change fixes a test case in t1404. This code is a bit stricter than it needs to be. We could conceivably allow reference "refs/foo/bar" to be created in the same transaction as "refs/foo" is deleted (or vice versa). But that would be complicated to implement, because it is not possible to lock "refs/foo/bar" while "refs/foo" exists as a loose reference, but on the other hand we don't want to delete some references before adding others (because that could leave a gap during which required objects are unreachable). There is also a complication that reflog files' paths can conflict. Any less-strict implementation would probably require tricks like the packing of all references before the start of the real transaction, or the use of temporary intermediate reference names. So for now let's accept too-strict checks. Some reference update transactions will be rejected unnecessarily, but they will be rejected in their entirety rather than leaving the repository in an intermediate state, as would happen now. Please note that there is still one kind of D/F conflict that is *not* handled correctly. If two processes are running at the same time, and one tries to create "refs/foo" at the same time that the other tries to create "refs/foo/bar", then they can race with each other. Both processes can obtain their respective locks ("refs/foo.lock" and "refs/foo/bar.lock"), proceed to the "commit" phase of ref_transaction_commit(), and then the slower process will discover that it cannot rename its lockfile into place (after possibly having committed changes to other references). There appears to be no way to fix this race without changing the locking policy, which in turn would require a change to *all* Git clients. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
2015-05-11t1404: new tests of ref D/F conflicts within transactionsLibravatar Michael Haggerty1-0/+107
Add some tests of reference D/F conflicts (by which I mean the fact that references like "refs/foo" and "refs/foo/bar" are not allowed to coexist) in the context of reference transactions. The test of creating two conflicting references in the same transaction fails, leaving the transaction half-completed. This will be fixed later in this patch series. Please note that the error messages emitted in the case of conflicts are not very user-friendly. In particular, when the conflicts involve loose references, then the errors are reported as error: there are still refs under 'refs/foo' fatal: Cannot lock the ref 'refs/foo'. or error: unable to resolve reference refs/foo/bar: Not a directory fatal: Cannot lock the ref 'refs/foo/bar'. This is because lock_ref_sha1_basic() fails while trying to lock the new reference, before it even gets to the is_refname_available() check. This situation will also be improved later in this patch series. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
2015-05-07tests: skip dav http-push tests under NO_EXPAT=NoThanksLibravatar Junio C Hamano1-0/+6
When built with NO_EXPAT=NoThanks, we will not have a working http-push over webdav. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-05-07t/lib-httpd.sh: skip tests if NO_CURL is definedLibravatar Jeff King7-35/+6
If we built git without curl, we can't actually test against an http server. In fact, all of the test scripts which include lib-httpd.sh already perform this check, with one exception: t5540. For those scripts, this is a noop, and for t5540, this is a bugfix (it used to fail when built with NO_CURL, though it could go unnoticed if you had a stale git-remote-https in your build directory). Noticed-by: Junio C Hamano <junio@pobox.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>