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The output of git-reflog is currently only customizable by calling
reflog with --pretty=... or overriding the default "oneline" pretty
format in the configuration. To save typing, teach reflog to fall back
to a default format specified in the config option "reflog.pretty"
unless a different pretty format is given on the command line. (This is
similar to the "format.pretty" option for git-log and git-show.)
When this config option is not set, fall back to the old default of
--pretty=oneline --abbrev-hash.
Signed-off-by: Roland Hieber <rhi@pengutronix.de>
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Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Custom userformat "log --format" learned %S atom that stands for
the tip the traversal reached the commit from, i.e. --source.
* it/log-format-source:
log: add %S option (like --source) to log --format
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Make it possible to write for example
git log --format="%H,%S"
where the %S at the end is a new placeholder that prints out the ref
(tag/branch) for each commit.
Using %d might seem like an alternative but it only shows the ref for the last
commit in the branch.
Signed-off-by: Issac Trotts <issactrotts@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git add -e" got confused when the change it wants to let the user
edit is smaller than the previous change that was left over in a
temporary file.
* js/add-e-clear-patch-before-stating:
add --edit: truncate the patch file
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If there is already a .git/ADD_EDIT.patch file, we fail to truncate it
properly, which could result in very funny errors.
Of course, this file should not be left lying around. But at least in
one case, there was a stale copy, larger than the current diff. So the
result was a corrupt diff.
Let's just truncate the file when we write it and not worry about it too
much.
Reported by J Wyman.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The code to walk tree objects has been taught that we may be
working with object names that are not computed with SHA-1.
* bc/tree-walk-oid:
cache: make oidcpy always copy GIT_MAX_RAWSZ bytes
tree-walk: store object_id in a separate member
match-trees: use hashcpy to splice trees
match-trees: compute buffer offset correctly when splicing
tree-walk: copy object ID before use
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There are some situations in which we want to store an object ID into
struct object_id without the_hash_algo necessarily being set correctly.
One such case is when cloning a repository, where we must read refs from
the remote side without having a repository from which to read the
preferred algorithm.
In this cases, we may have the_hash_algo set to SHA-1, which is the
default, but read refs into struct object_id that are SHA-256. When
copying these values, we will want to copy them completely, not just the
first 20 bytes. Consequently, make sure that oidcpy copies the maximum
number of bytes at all times, regardless of the setting of
the_hash_algo.
Since oidcpy and hashcpy are no longer functionally identical, remove
the Cocinelle object_id transformations that convert from one into the
other.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When parsing a tree, we read the object ID directly out of the tree
buffer. This is normally fine, but such an object ID cannot be used with
oidcpy, which copies GIT_MAX_RAWSZ bytes, because if we are using SHA-1,
there may not be that many bytes to copy.
Instead, store the object ID in a separate struct member. Since we can
no longer efficiently compute the path length, store that information as
well in struct name_entry. Ensure we only copy the object ID into the
new buffer if the path length is nonzero, as some callers will pass us
an empty path with no object ID following it, and we will not want to
read past the end of the buffer.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we splice trees together, we operate in place on the tree buffer.
If we're using SHA-1 for the hash algorithm, we may not have a full
GIT_MAX_RAWSZ (32) bytes to copy. Consequently, it doesn't logically
make sense for us to use a struct object_id to represent this type,
since it isn't a complete object.
Represent this value as a unsigned char pointer instead and copy it when
necessary.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Currently, the struct object_id pointer returned from tree_entry_extract
lives directly inside the parsed tree buffer. In a future commit, this
will change so that it instead points to a dedicated struct member.
Since in this code path, we want to modify the buffer directly, compute
the buffer offset we want to modify by using the pointer to the path
instead.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In a future commit, the pointer returned by tree_entry_extract will
point into the struct tree_desc, causing its lifetime to be bound to
that of the struct tree_desc itself. To ensure this code path keeps
working, copy the object_id into a local variable so that it lives long
enough.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git fetch --deepen=<more>" has been corrected to work over v2
protocol.
* jt/upload-pack-deepen-relative-proto-v2:
upload-pack: teach deepen-relative in protocol v2
fetch-pack: do not take shallow lock unnecessarily
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Commit 685fbd3291 ("fetch-pack: perform a fetch using v2", 2018-03-15)
attempted to teach Git deepen-relative in protocol v2 (among other
things), but it didn't work:
(1) fetch-pack.c needs to emit "deepen-relative".
(2) upload-pack.c needs to ensure that the correct deepen_relative
variable is passed to deepen() (there are two - the static variable
and the one in struct upload_pack_data).
(3) Before deepen() computes the list of reachable shallows, it first
needs to mark all "our" refs as OUR_REF. v2 currently does not do
this, because unlike v0, it is not needed otherwise.
Fix all this and include a test demonstrating that it works now. For
(2), the static variable deepen_relative is also eliminated, removing a
source of confusion.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Reviewed-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When fetching using protocol v2, the remote may send a "shallow-info"
section if the client is shallow. If so, Git as the client currently
takes the shallow file lock, even if the "shallow-info" section is
empty.
This is not a problem except that Git does not support taking the
shallow file lock after modifying the shallow file, because
is_repository_shallow() stores information that is never cleared. And
this take-after-modify occurs when Git does a tag-following fetch from a
shallow repository on a transport that does not support tag following
(since in this case, 2 fetches are performed).
To solve this issue, take the shallow file lock (and perform all other
shallow processing) only if the "shallow-info" section is non-empty;
otherwise, behave as if it were empty.
A full solution (probably, ensuring that any action of committing
shallow file locks also includes clearing the information stored by
is_repository_shallow()) would solve the issue without need for this
patch, but this patch is independently useful (as an optimization to
prevent writing a file in an unnecessary case), hence why I wrote it. I
have included a NEEDSWORK outlining the full solution.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code clean-up.
* jk/remote-insteadof-cleanup:
remote: check config validity before creating rewrite struct
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When parsing url.foo.insteadOf, we call make_rewrite() and only then
check to make sure the config value is a string (and return an error if
it isn't). This isn't quite a leak, because the struct we allocate is
part of a global array, but it does leave a funny half-finished struct.
In practice, it doesn't make much difference because we exit soon after
due to the config error anyway. But let's flip the order here to avoid
leaving a trap for somebody in the future.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Debugging help for http transport.
* ms/http-no-more-failonerror:
test: test GIT_CURL_VERBOSE=1 shows an error
remote-curl: unset CURLOPT_FAILONERROR
remote-curl: define struct for CURLOPT_WRITEFUNCTION
http: enable keep_error for HTTP requests
http: support file handles for HTTP_KEEP_ERROR
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This tests GIT_CURL_VERBOSE shows an error when an URL returns 500. This
exercises the code in remote_curl.
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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By not setting CURLOPT_FAILONERROR, curl parses the HTTP response
headers even if the response is an error. This makes GIT_CURL_VERBOSE to
show the HTTP headers, which is useful for debugging.
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In order to pass more values for rpc_in, define a struct and pass it as
an additional value.
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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curl stops parsing a response when it sees a bad HTTP status code and it
has CURLOPT_FAILONERROR set. This prevents GIT_CURL_VERBOSE to show HTTP
headers on error.
keep_error is an option to receive the HTTP response body for those
error responses. By enabling this option, curl will process the HTTP
response headers, and they're shown if GIT_CURL_VERBOSE is set.
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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HTTP_KEEP_ERROR makes it easy to debug HTTP transport errors. In order
to make HTTP_KEEP_ERROR enabled for all requests, file handles need to
be supported.
Signed-off-by: Masaya Suzuki <masayasuzuki@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git rebase" internally runs "checkout" to switch between branches,
and the command used to call the post-checkout hook, but the
reimplementation stopped doing so, which is getting fixed.
* os/rebase-runs-post-checkout-hook:
rebase: run post-checkout hook on checkout
t5403: simplify by using a single repository
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The scripted version of rebase used to run this hook on the initial
checkout. The transition to built-in introduced a regression.
Signed-off-by: Orgad Shaneh <orgads@gmail.com>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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There is no strong reason to use separate clones to run
these tests; just use a single test repository prepared
with more modern test_commit shell helper function.
While at it, replace three "awk '{print $N}'" on the same
file with shell built-in "read" into three variables.
Revert d42ec126aa717d00549e387d5a95fd55683c2e2c which is a workaround for
Cygwin that is no longer needed.
Signed-off-by: Orgad Shaneh <orgads@gmail.com>
Acked-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add sha-256 hash and plug it through the code to allow building Git
with the "NewHash".
* bc/sha-256:
hash: add an SHA-256 implementation using OpenSSL
sha256: add an SHA-256 implementation using libgcrypt
Add a base implementation of SHA-256 support
commit-graph: convert to using the_hash_algo
t/helper: add a test helper to compute hash speed
sha1-file: add a constant for hash block size
t: make the sha1 test-tool helper generic
t: add basic tests for our SHA-1 implementation
cache: make hashcmp and hasheq work with larger hashes
hex: introduce functions to print arbitrary hashes
sha1-file: provide functions to look up hash algorithms
sha1-file: rename algorithm to "sha1"
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We already have OpenSSL routines available for SHA-1, so add routines
for SHA-256 as well.
On a Core i7-6600U, this SHA-256 implementation compares favorably to
the SHA1DC SHA-1 implementation:
SHA-1: 157 MiB/s (64 byte chunks); 337 MiB/s (16 KiB chunks)
SHA-256: 165 MiB/s (64 byte chunks); 408 MiB/s (16 KiB chunks)
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Generally, one gets better performance out of cryptographic routines
written in assembly than C, and this is also true for SHA-256. In
addition, most Linux distributions cannot distribute Git linked against
OpenSSL for licensing reasons.
Most systems with GnuPG will also have libgcrypt, since it is a
dependency of GnuPG. libgcrypt is also faster than the SHA1DC
implementation for messages of a few KiB and larger.
For comparison, on a Core i7-6600U, this implementation processes 16 KiB
chunks at 355 MiB/s while SHA1DC processes equivalent chunks at 337
MiB/s.
In addition, libgcrypt is licensed under the LGPL 2.1, which is
compatible with the GPL. Add an implementation of SHA-256 that uses
libgcrypt.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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SHA-1 is weak and we need to transition to a new hash function. For
some time, we have referred to this new function as NewHash. Recently,
we decided to pick SHA-256 as NewHash. The reasons behind the choice of
SHA-256 are outlined in the thread starting at [1] and in the commit
history for the hash function transition document.
Add a basic implementation of SHA-256 based off libtomcrypt, which is in
the public domain. Optimize it and restructure it to meet our coding
standards. Pull in the update and final functions from the SHA-1 block
implementation, as we know these function correctly with all compilers.
This implementation is slower than SHA-1, but more performant
implementations will be introduced in future commits.
Wire up SHA-256 in the list of hash algorithms, and add a test that the
algorithm works correctly.
Note that with this patch, it is still not possible to switch to using
SHA-256 in Git. Additional patches are needed to prepare the code to
handle a larger hash algorithm and further test fixes are needed.
[1] https://public-inbox.org/git/20180609224913.GC38834@genre.crustytoothpaste.net/
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Instead of using hard-coded constants for object sizes, use
the_hash_algo to look them up. In addition, use a function call to look
up the object ID version and produce the correct value. For now, we use
version 1, which means to use the default algorithm used in the rest of
the repository.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add a utility (which is less for the testsuite and more for developers)
that can compute hash speeds for whatever hash algorithms are
implemented. This allows developers to test their personal systems to
determine the performance characteristics of various algorithms.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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There is one place we need the hash algorithm block size: the HMAC code
for push certs. Expose this constant in struct git_hash_algo and expose
values for SHA-1 and for the largest value of any hash.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Since we're going to have multiple hash algorithms to test, it makes
sense to share as much of the test code as possible. Convert the sha1
helper for the test-tool to be generic and move it out into its own
module. This will allow us to share most of this code with our NewHash
implementation.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We have in the past had some unfortunate endianness issues with some
SHA-1 implementations we ship, especially on big-endian machines. Add
an explicit test using the test helper to catch these issues and point
them out prominently. This test can also be used as a staging ground
for people testing additional algorithms to verify that their
implementations are working as expected.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In 183a638b7d ("hashcmp: assert constant hash size", 2018-08-23), we
modified hashcmp to assert that the hash size was always 20 to help it
optimize and inline calls to memcmp. In a future series, we replaced
many calls to hashcmp and oidcmp with calls to hasheq and oideq to
improve inlining further.
However, we want to support hash algorithms other than SHA-1, namely
SHA-256. When doing so, we must handle the case where these values are
32 bytes long as well as 20. Adjust hashcmp to handle two cases:
20-byte matches, and maximum-size matches. Therefore, when we include
SHA-256, we'll automatically handle it properly, while at the same time
teaching the compiler that there are only two possible options to
consider. This will allow the compiler to write the most efficient
possible code.
Copy similar code into hasheq and perform an identical transformation.
At least with GCC 8.2.0, making hasheq defer to hashcmp when there are
two branches prevents the compiler from inlining the comparison, while
the code in this patch is inlined properly. Add a comment to avoid an
accidental performance regression from well-intentioned refactoring.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Currently, we have functions that turn an arbitrary SHA-1 value or an
object ID into hex format, either using a static buffer or with a
user-provided buffer. Add variants of these functions that can handle
an arbitrary hash algorithm, specified by constant. Update the
documentation as well.
While we're at it, remove the "extern" declaration from this family of
functions, since it's not needed and our style now recommends against
it.
We use the variant taking the algorithm structure pointer as the
internal variant, since taking an algorithm pointer is the easiest way
to handle all of the variants in use.
Note that we maintain these functions because there are hashes which
must change based on the hash algorithm in use but are not object IDs
(such as pack checksums).
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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There are several ways we might refer to a hash algorithm: by name, such
as in the config file; by format ID, such as in a pack; or internally,
by a pointer to the hash_algos array. Provide functions to look up hash
algorithms based on these various forms and return the internal constant
used for them. If conversion to another form is necessary, this
internal constant can be used to look up the proper data in the
hash_algos array.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The transition plan anticipates us using a syntax such as "^{sha1}" for
disambiguation. Since this is a syntax some people will be typing a
lot, it makes sense to provide a short, easy-to-type syntax. Omitting
the dash doesn't create any ambiguity; however, it does make the syntax
shorter and easier to type, especially for touch typists. In addition,
the transition plan already uses "sha1" in this context.
Rename the name of SHA-1 implementation to "sha1".
Note that this change creates no backwards compatibility concerns, since
we haven't yet used this field in any configuration settings.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git fetch --recurse-submodules" may not fetch the necessary commit
that is bound to the superproject, which is getting corrected.
* sb/submodule-recursive-fetch-gets-the-tip:
fetch: ensure submodule objects fetched
submodule.c: fetch in submodules git directory instead of in worktree
submodule: migrate get_next_submodule to use repository structs
repository: repo_submodule_init to take a submodule struct
submodule: store OIDs in changed_submodule_names
submodule.c: tighten scope of changed_submodule_names struct
submodule.c: sort changed_submodule_names before searching it
submodule.c: fix indentation
sha1-array: provide oid_array_filter
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Currently when git-fetch is asked to recurse into submodules, it dispatches
a plain "git-fetch -C <submodule-dir>" (with some submodule related options
such as prefix and recusing strategy, but) without any information of the
remote or the tip that should be fetched.
But this default fetch is not sufficient, as a newly fetched commit in
the superproject could point to a commit in the submodule that is not
in the default refspec. This is common in workflows like Gerrit's.
When fetching a Gerrit change under review (from refs/changes/??), the
commits in that change likely point to submodule commits that have not
been merged to a branch yet.
Fetch a submodule object by id if the object that the superproject
points to, cannot be found. For now this object is fetched from the
'origin' remote as we defer getting the default remote to a later patch.
A list of new submodule commits are already generated in certain
conditions (by check_for_new_submodule_commits()); this new feature
invokes that function in more situations.
The submodule checks were done only when a ref in the superproject
changed, these checks were extended to also be performed when fetching
into FETCH_HEAD for completeness, and add a test for that too.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Keep the properties introduced in 10f5c52656 (submodule: avoid
auto-discovery in prepare_submodule_repo_env(), 2016-09-01), by fixating
the git directory of the submodule.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We used to recurse into submodules, even if they were broken having
only an objects directory. The child process executed in the submodule
would fail though if the submodule was broken. This is tested via
"fetching submodule into a broken repository" in t5526.
This patch tightens the check upfront, such that we do not need
to spawn a child process to find out if the submodule is broken.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When constructing a struct repository for a submodule for some revision
of the superproject where the submodule is not contained in the index,
it may not be present in the working tree currently either. In that
situation giving a 'path' argument is not useful. Upgrade the
repo_submodule_init function to take a struct submodule instead.
The submodule struct can be obtained via submodule_from_{path, name} or
an artificial submodule struct can be passed in.
While we are at it, rename the repository struct in the repo_submodule_init
function, which is to be initialized, to a name that is not confused with
the struct submodule as easily. Perform such renames in similar functions
as well.
Also move its documentation into the header file.
Reviewed-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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'calculate_changed_submodule_paths' uses a local list to compute the
changed submodules, and then produces the result by copying appropriate
items into the result list.
Instead use the result list directly and prune items afterwards
using string_list_remove_empty_items.
By doing so we'll have access to the util pointer for longer that
contains the commits that we need to fetch, which will be
useful in a later patch.
Signed-off-by: Stefan Beller <sbeller@google.com>
Reviewed-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The `changed_submodule_names` are only used for fetching, so let's make it
part of the struct that is passed around for fetching submodules.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We can string_list_insert() to maintain sorted-ness of the
list as we find new items, or we can string_list_append() to
build an unsorted list and sort it at the end just once.
As we do not rely on the sortedness while building the
list, we pick the "append and sort at the end" as it
has better worst case execution times.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The submodule subsystem is really bad at staying within 80 characters.
Fix it while we are here.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git fetch-pack" now can talk the version 2 protocol.
* jt/fetch-pack-v2:
fetch-pack: support protocol version 2
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