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2020-07-09Merge branch 'tb/fix-persistent-shallow' into masterLibravatar Junio C Hamano1-0/+14
When "fetch.writeCommitGraph" configuration is set in a shallow repository and a fetch moves the shallow boundary, we wrote out broken commit-graph files that do not match the reality, which has been corrected. * tb/fix-persistent-shallow: commit.c: don't persist substituted parents when unshallowing
2020-07-08commit.c: don't persist substituted parents when unshallowingLibravatar Taylor Blau1-0/+14
Since 37b9dcabfc (shallow.c: use '{commit,rollback}_shallow_file', 2020-04-22), Git knows how to reset stat-validity checks for the $GIT_DIR/shallow file, allowing it to change between a shallow and non-shallow state in the same process (e.g., in the case of 'git fetch --unshallow'). However, when $GIT_DIR/shallow changes, Git does not alter or remove any grafts (nor substituted parents) in memory. This comes up in a "git fetch --unshallow" with fetch.writeCommitGraph set to true. Ordinarily in a shallow repository (and before 37b9dcabfc, even in this case), commit_graph_compatible() would return false, indicating that the repository should not be used to write a commit-graphs (since commit-graph files cannot represent a shallow history). But since 37b9dcabfc, in an --unshallow operation that check succeeds. Thus even though the repository isn't shallow any longer (that is, we have all of the objects), the in-core representation of those objects still has munged parents at the shallow boundaries. When the commit-graph write proceeds, we use the incorrect parentage, producing wrong results. There are two ways for a user to work around this: either (1) set 'fetch.writeCommitGraph' to 'false', or (2) drop the commit-graph after unshallowing. One way to fix this would be to reset the parsed object pool entirely (flushing the cache and thus preventing subsequent reads from modifying their parents) after unshallowing. That would produce a problem when callers have a now-stale reference to the old pool, and so this patch implements a different approach. Instead, attach a new bit to the pool, 'substituted_parent', which indicates if the repository *ever* stored a commit which had its parents modified (i.e., the shallow boundary prior to unshallowing). This bit needs to be sticky because all reads subsequent to modifying a commit's parents are unreliable when unshallowing. Modify the check in 'commit_graph_compatible' to take this bit into account, and correctly avoid generating commit-graphs in this case, thus solving the bug. Helped-by: Derrick Stolee <dstolee@microsoft.com> Helped-by: Jonathan Nieder <jrnieder@gmail.com> Reported-by: Jay Conrod <jayconrod@google.com> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-05-01Merge branch 'tb/reset-shallow'Libravatar Junio C Hamano1-53/+46
Fix in-core inconsistency after fetching into a shallow repository that broke the code to write out commit-graph. * tb/reset-shallow: shallow.c: use '{commit,rollback}_shallow_file' t5537: use test_write_lines and indented heredocs for readability
2020-04-24shallow.c: use '{commit,rollback}_shallow_file'Libravatar Taylor Blau1-0/+29
In bd0b42aed3 (fetch-pack: do not take shallow lock unnecessarily, 2019-01-10), the author noted that 'is_repository_shallow' produces visible side-effect(s) by setting 'is_shallow' and 'shallow_stat'. This is a problem for e.g., fetching with '--update-shallow' in a shallow repository with 'fetch.writeCommitGraph' enabled, since the update to '.git/shallow' will cause Git to think that the repository isn't shallow when it is, thereby circumventing the commit-graph compatibility check. This causes problems in shallow repositories with at least shallow refs that have at least one ancestor (since the client won't have those objects, and therefore can't take the reachability closure over commits when writing a commit-graph). Address this by introducing thin wrappers over 'commit_lock_file' and 'rollback_lock_file' for use specifically when the lock is held over '.git/shallow'. These wrappers (appropriately called 'commit_shallow_file' and 'rollback_shallow_file') call into their respective functions in 'lockfile.h', but additionally reset validity checks used by the shallow machinery. Replace each instance of 'commit_lock_file' and 'rollback_lock_file' with 'commit_shallow_file' and 'rollback_shallow_file' when the lock being held is over the '.git/shallow' file. As a result, 'prune_shallow' can now only be called once (since 'check_shallow_file_for_update' will die after calling 'reset_repository_shallow'). But, this is OK since we only call 'prune_shallow' at most once per process. Helped-by: Jonathan Tan <jonathantanmy@google.com> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Taylor Blau <me@ttaylorr.com> Reviewed-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-04-24t5537: use test_write_lines and indented heredocs for readabilityLibravatar Taylor Blau1-53/+17
A number of spots in t5537 use the non-indented heredoc '<<EOF' when they would benefit from instead using '<<-EOF' or simply test_write_lines. In preparation for adding new tests in a good style and being consistent with the surrounding code, update the existing tests to improve their readability. Suggested-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Taylor Blau <me@ttaylorr.com> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-03-22t: fix whitespace around &&Libravatar Andrei Rybak1-1/+1
Add missing spaces before '&&' and switch tabs around '&&' to spaces. Also fix the space after redirection operator in t3701 while we're here. These issues were found using `git grep '[^ ]&&$'` and `git grep -P '&&\t' t/`. Signed-off-by: Andrei Rybak <rybak.a.v@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-03-05t5537: adjust test_oid labelLibravatar Johannes Schindelin1-3/+3
We recently switched to using Perl instead of `sed` in the httpd-based tests. Let's reflect that in the label we give the corresponding commit hashes. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-03-05Merge branch 'js/ci-windows-update'Libravatar Junio C Hamano1-5/+5
Updates to the CI settings. * js/ci-windows-update: Azure Pipeline: switch to the latest agent pools ci: prevent `perforce` from being quarantined t/lib-httpd: avoid using macOS' sed
2020-02-27t/lib-httpd: avoid using macOS' sedLibravatar Johannes Schindelin1-5/+5
Among other differences relative to GNU sed, macOS' sed always ends its output with a trailing newline, even if the input did not have such a trailing newline. Surprisingly, this makes three httpd-based tests fail on macOS: t5616, t5702 and t5703. ("Surprisingly" because those tests have been around for some time, but apparently nobody runs them on macOS with a working Apache2 setup.) The reason is that we use `sed` in those tests to filter the response of the web server. Apart from the fact that we use GNU constructs (such as using a space after the `c` command instead of a backslash and a newline), we have another problem: macOS' sed LF-only newlines while webservers are supposed to use CR/LF ones. Even worse, t5616 uses `sed` to replace a binary part of the response with a new binary part (kind of hoping that the replaced binary part does not contain a 0x0a byte which would be interpreted as a newline). To that end, it calls on Perl to read the binary pack file and hex-encode it, then calls on `sed` to prefix every hex digit pair with a `\x` in order to construct the text that the `c` statement of the `sed` invocation is supposed to insert. So we call Perl and sed to construct a sed statement. The final nail in the coffin is that macOS' sed does not even interpret those `\x<hex>` constructs. Let's just replace all of that by Perl snippets. With Perl, at least, we do not have to deal with GNU vs macOS semantics, we do not have to worry about unwanted trailing newlines, and we do not have to spawn commands to construct arguments for other commands to be spawned (i.e. we can avoid a whole lot of shell scripting complexity). The upshot is that this fixes t5616, t5702 and t5703 on macOS with Apache2. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-01-15t5537: make hash size independentLibravatar brian m. carlson1-2/+6
This test modifies a pkt-line stream with sed to change a line with "shallow" to "unshallow". However, this modification is dependent on the size of the hash in use; with SHA-256, the pkt-line length is different, leading to the sed command having no effect. Use test_oid_cache to specify the correct values for each hash so that the test continues to work. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-08-02t: warn against adding non-httpd-specific tests after sourcing 'lib-httpd'Libravatar SZEDER Gábor1-0/+3
We have a couple of test scripts that are not completely httpd-specific, but do run a few httpd-specific tests at the end. These test scripts source 'lib-httpd.sh' somewhere mid-script, which then skips all the rest of the test script if the dependencies for running httpd tests are not fulfilled. As the previous two patches in this series show, already on two occasions non-httpd-specific tests were appended at the end of such test scripts, and, consequently, they were skipped as well when httpd tests couldn't be run. Add a comment at the end of these test scripts to warn against adding non-httpd-specific tests at the end, in the hope that they will help prevent similar issues in the future. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-03-14tests: use 'test_atexit' to stop httpdLibravatar SZEDER Gábor1-2/+0
Use 'test_atexit' to run cleanup commands to stop httpd at the end of the test script or upon interrupt or failure, as it is shorter, simpler, and more robust than registering such cleanup commands in the trap on EXIT in the test scripts. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-01-17tests: define GIT_TEST_SIDEBAND_ALLLibravatar Jonathan Tan1-1/+2
Define a GIT_TEST_SIDEBAND_ALL environment variable meant to be used from tests. When set to true, this overrides uploadpack.allowsidebandall to true, allowing the entire test suite to be run as if this configuration is in place for all repositories. As of this patch, all tests pass whether GIT_TEST_SIDEBAND_ALL is unset or set to 1. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-10-25repack -ad: prune the list of shallow commitsLibravatar Johannes Schindelin1-1/+1
`git repack` can drop unreachable commits without further warning, making the corresponding entries in `.git/shallow` invalid, which causes serious problems when deepening the branches. One scenario where unreachable commits are dropped by `git repack` is when a `git fetch --prune` (or even a `git fetch` when a ref was force-pushed in the meantime) can make a commit unreachable that was reachable before. Therefore it is not safe to assume that a `git repack -adlf` will keep unreachable commits alone (under the assumption that they had not been packed in the first place, which is an assumption at least some of Git's code seems to make). This is particularly important to keep in mind when looking at the `.git/shallow` file: if any commits listed in that file become unreachable, it is not a problem, but if they go missing, it *is* a problem. One symptom of this problem is that a deepening fetch may now fail with fatal: error in object: unshallow <commit-hash> To avoid this problem, let's prune the shallow list in `git repack` when the `-d` option is passed, unless `-A` is passed, too (which would force the now-unreachable objects to be turned into loose objects instead of being deleted). Additionally, we also need to take `--keep-reachable` and `--unpack-unreachable=<date>` into account. Note: an alternative solution discussed during the review of this patch was to teach `git fetch` to simply ignore entries in .git/shallow if the corresponding commits do not exist locally. A quick test, however, revealed that the .git/shallow file is written during a shallow *clone*, in which case the commits do not exist, either, but the "shallow" line *does* need to be sent. Therefore, this approach would be a lot more finicky than the approach presented by the this patch. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-10-25repack: point out a bug handling stale shallow infoLibravatar Johannes Schindelin1-0/+27
A `git fetch --prune` can turn previously-reachable objects unreachable, even commits that are in the `shallow` list. A subsequent `git repack -ad` will then unceremoniously drop those unreachable commits, and the `shallow` list will become stale. This means that when we try to fetch with a larger `--depth` the next time, we may end up with: fatal: error in object: unshallow <commit-hash> Reported by Alejandro Pauly. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-07-24Merge branch 'jt/connectivity-check-after-unshallow'Libravatar Junio C Hamano1-0/+43
"git fetch" failed to correctly validate the set of objects it received when making a shallow history deeper, which has been corrected. * jt/connectivity-check-after-unshallow: fetch-pack: write shallow, then check connectivity fetch-pack: implement ref-in-want fetch-pack: put shallow info in output parameter fetch: refactor to make function args narrower fetch: refactor fetch_refs into two functions fetch: refactor the population of peer ref OIDs upload-pack: test negotiation with changing repository upload-pack: implement ref-in-want test-pkt-line: add unpack-sideband subcommand
2018-07-03fetch-pack: write shallow, then check connectivityLibravatar Jonathan Tan1-0/+43
When fetching, connectivity is checked after the shallow file is updated. There are 2 issues with this: (1) the connectivity check is only performed up to ancestors of existing refs (which is not thorough enough if we were deepening an existing ref in the first place), and (2) there is no rollback of the shallow file if the connectivity check fails. To solve (1), update the connectivity check to check the ancestry chain completely in the case of a deepening fetch by refraining from passing "--not --all" when invoking rev-list in connected.c. To solve (2), have fetch_pack() perform its own connectivity check before updating the shallow file. To support existing use cases in which "git fetch-pack" is used to download objects without much regard as to the connectivity of the resulting objects with respect to the existing repository, the connectivity check is only done if necessary (that is, the fetch is not a clone, and the fetch involves shallow/deepen functionality). "git fetch" still performs its own connectivity check, preserving correctness but sometimes performing redundant work. This redundancy is mitigated by the fact that fetch_pack() reports if it has performed a connectivity check itself, and if the transport supports connect or stateless-connect, it will bubble up that report so that "git fetch" knows not to perform the connectivity check in such a case. This was noticed when a user tried to deepen an existing repository by fetching with --no-shallow from a server that did not send all necessary objects - the connectivity check as run by "git fetch" succeeded, but a subsequent "git fsck" failed. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-15tests: clean after SANITY testsLibravatar Junio C Hamano1-1/+1
Some of our tests try to make sure Git behaves sensibly in a read-only directory, by dropping 'w' permission bit before doing a test and then restoring it after it is done. The latter is needed for the test framework to clean after itself without leaving a leftover directory that cannot be removed. Ancient parts of tests however arrange the above with chmod a-w . && ... do the test ... status=$? chmod 775 . (exit $status) which obviously would not work if the test somehow dies before it has the chance to do "chmod 775". Rewrite them by following a more robust pattern recently written tests use, which is test_when_finished "chmod 775 ." && chmod a-w . && ... do the test ... Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-01-04t/t5537-fetch-shallow.sh: use the $( ... ) construct for command substitutionLibravatar Elia Pinto1-2/+2
The Git CodingGuidelines prefer the $(...) construct for command substitution instead of using the backquotes `...`. The backquoted form is the traditional method for command substitution, and is supported by POSIX. However, all but the simplest uses become complicated quickly. In particular, embedded command substitutions and/or the use of double quotes require careful escaping with the backslash character. The patch was generated by: for _f in $(find . -name "*.sh") do perl -i -pe 'BEGIN{undef $/;} s/`(.+?)`/\$(\1)/smg' "${_f}" done and then carefully proof-read. Signed-off-by: Elia Pinto <gitter.spiros@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-05-30t5537: re-drop http testsLibravatar Jeff King1-28/+0
These were originally removed by 0232852 (t5537: move http tests out to t5539, 2014-02-13). However, they were accidentally re-added in 1ddb4d7 (Merge branch 'nd/upload-pack-shallow', 2014-03-21). This looks like an error in manual conflict resolution. Here's what happened: 1. v1.9.0 shipped with the http tests in t5537. 2. We realized that this caused problems, and built 0232852 on top to move the tests to their own file. This fix made it into v1.9.1. 3. We later had another fix in nd/upload-pack-shallow that also touched t5537. It was built directly on v1.9.0. When we merged nd/upload-pack-shallow to master, we got a conflict; it was built on a version with the http tests, but we had since removed them. The correct resolution was to drop the http tests and keep the new ones, but instead we kept everything. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-03-11upload-pack: send shallow info over stdin to pack-objectsLibravatar Nguyễn Thái Ngọc Duy1-0/+13
Before cdab485 (upload-pack: delegate rev walking in shallow fetch to pack-objects - 2013-08-16) upload-pack does not write to the source repository. cdab485 starts to write $GIT_DIR/shallow_XXXXXX if it's a shallow fetch, so the source repo must be writable. git:// servers do not need write access to repos and usually don't have it, which means cdab485 breaks shallow clone over git:// Instead of using a temporary file as the media for shallow points, we can send them over stdin to pack-objects as well. Prepend shallow SHA-1 with --shallow so pack-objects knows what is what. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-09t5537: fix incorrect expectation in test case 10Libravatar Nguyễn Thái Ngọc Duy1-1/+2
Commit 48d25ca adds a new commit "7" to the repo that the next test case in commit 1609488 clones from. But the next test case does not expect this commit. For these tests, it's the bottom that's important, not the top. Fix the expected commit list. While at it, fix the default http port number to 5537. Otherwise when t5536 learns to test httpd, running test in parallel may fail. References: 48d25ca fetch: add --update-shallow to accept... - 2013-12-05 1609488 smart-http: support shallow fetch/clone - 2013-12-05 Noticed-by: Jeff King <peff@peff.net> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-10smart-http: support shallow fetch/cloneLibravatar Nguyễn Thái Ngọc Duy1-0/+27
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-10fetch: add --update-shallow to accept refs that update .git/shallowLibravatar Nguyễn Thái Ngọc Duy1-0/+32
The same steps are done as in when --update-shallow is not given. The only difference is we now add all shallow commits in "ours" and "theirs" to .git/shallow (aka "step 8"). Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-10upload-pack: make sure deepening preserves shallow rootsLibravatar Nguyễn Thái Ngọc Duy1-0/+16
When "fetch --depth=N" where N exceeds the longest chain of history in the source repo, usually we just send an "unshallow" line to the client so full history is obtained. When the source repo is shallow we need to make sure to "unshallow" the current shallow point _and_ "shallow" again when the commit reaches its shallow bottom in the source repo. This should fix both cases: large <N> and --unshallow. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-12-10fetch: support fetching from a shallow repositoryLibravatar Nguyễn Thái Ngọc Duy1-0/+128
This patch just put together pieces from the 8 steps patch. We stop at step 7 and reject refs that require new shallow commits. Note that, by rejecting refs that require new shallow commits, we leave dangling objects in the repo, which become "object islands" by the next "git fetch" of the same source. If the first fetch our "ours" set is zero and we do practically nothing at step 7, "ours" is full at the next fetch and we may need to walk through commits for reachability test. Room for improvement. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>