A major part of "git submodule update" has been ported to C to take
advantage of the recently added framework to run download tasks in
parallel.
* sb/submodule-parallel-update:
clone: allow an explicit argument for parallel submodule clones
submodule update: expose parallelism to the user
submodule helper: remove double 'fatal: ' prefix
git submodule update: have a dedicated helper for cloning
run_processes_parallel: rename parameters for the callbacks
run_processes_parallel: treat output of children as byte array
submodule update: direct error message to stderr
fetching submodules: respect `submodule.fetchJobs` config option
submodule-config: drop check against NULL
submodule-config: keep update strategy around
git blame reports lines as not "Not Committed Yet" when they have
CRLF in the index, CRLF in the worktree and core.autocrlf is true.
Since commit c4805393 (autocrlf: Make it work also for un-normalized
repositories, 2010-05-12), files that have CRLF in the index are not
normalized at commit when core.autocrl is set.
Add a call to read_cache() early in fake_working_tree_commit(),
before calling convert_to_git().
Signed-off-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
In general "echo 2>&1 $msg" to redirect a possible error message
that comes from 'echo' itself into the same standard output stream
$msg is getting written to does not make any sense; it is not like
we are expecting to see any errors out of 'echo' in these statements,
and even if it were the case, there is no reason to prevent the
error messages from being sent to the standard error stream.
These are clearly meant to send the argument given to echo to the
standard error stream as error messages. Correctly redirect by
saying "send what is written to the standard output to the standard
error", i.e. "1>&2" aka ">&2".
1. It always skips past "refs/remotes/", instead of
skipping past the prefix associated with the branch we
are showing (so commonly we see "refs/remotes/" for the
refs/remotes/origin/HEAD symref, but the previous code
would skip "refs/heads/" when showing a symref it found
in refs/heads/.
2. If skip_prefix() does not match, it leaves "desc"
untouched, and we show whatever happened to be in it
(which is the refname from a call to skip_prefix()
earlier in the function).
3. If we do match with skip_prefix(), we stomp on the
"desc" variable, which is later passed to
add_verbose_info(). We probably want to retain the
original refname there (though it likely doesn't matter
in practice, since after all, one points to the other).
The fix to match the original code is fairly easy: record
the prefix to strip based on item->kind, and use it here.
However, since we already have a local variable named "prefix",
let's give the two prefixes verbose names so we don't
confuse them.
Signed-off-by: Jeff King <peff@peff.net> Acked-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The test prepares a simple commit with HT on its log message lines,
and makes sure that
- formats that should or should not expand tabs by default do or do
not expand tabs respectively,
- with explicit --expand-tabs=<N> and short-hands --expand-tabs
(equivalent to --expand-tabs=8) and --no-expand-tabs (equivalent
to --expand-tabs=0) before or after the explicit --pretty=$fmt,
the tabs are expanded (or not expanded) accordingly.
The tests use the second line of the log message for formats other
than --pretty=short, primarily because the first line of the email
format is handled specially to add the [PATCH] prefix, etc. in a
separate codepath (--pretty=short uses the first line because there
is no other line to test).
Windows: shorten code by re-using convert_slashes()
Make a few more spots more readable by using the recently introduced,
Windows-specific helper.
Signed-off-by: Johannes Sixt <j6t@kdbg.org> Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-format-patch.txt: don't show -s as shorthand for multiple options
git-format-patch recognizes -s as shorthand only for --signoff, however,
its documentation shows -s as shorthand for both --signoff and
--no-patch. Resolve this confusion by suppressing the bogus -s shorthand
for --no-patch.
While here, also avoid showing the --no-patch option in git-format-patch
documentation since it doesn't make sense to ask to suppress the patch
while at the same time explicitly asking to format the patch (which,
after all, is the purpose of git-format-patch).
Reported-by: Kevin Brodsky <corax26@gmail.com> Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
When renaming a branch, currently only the HEAD of current working tree
is updated, but it must update HEADs of all working trees which point at
the old branch.
This is the current behavior, /path/to/wt's HEAD is not updated:
Add a new function set_worktree_head_symref, to update HEAD symref for
the specified worktree.
To update HEAD of a linked working tree,
create_symref("worktrees/$work_tree/HEAD", "refs/heads/$branch", msg)
could be used. However when it comes to updating HEAD of the main
working tree, it is unusable because it uses $GIT_DIR for
worktree-specific symrefs (HEAD).
The new function takes git_dir (real directory) as an argument, and
updates HEAD of the working tree. This function will be used when
renaming a branch.
Signed-off-by: Kazuki Yamaguchi <k@rhe.jp> Acked-by: David Turner <dturner@twopensource.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
t5520: test --[no-]autostash with pull.rebase=true
The "--[no-]autostash" options for git-pull are only valid in
rebase mode (i.e. either --rebase is used or pull.rebase=true).
Existing tests already check the cases when --rebase is used but
fail to check for pull.rebase=true case.
Add two new tests to check that the --[no-]autostash options work
with pull.rebase=true.
Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
These two tests are almost similar and thus can be folded in a for-loop.
Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Factor out common code into test_pull_autostash_fail() and then call it in
these tests.
Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
t5520: factor out common "successful autostash" code
Four tests contains repetitive lines of code.
Factor out common code into test_pull_autostash() and then call it in
these tests.
Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Checking stderr output using test_i18ncmp may lead to test failure as
some shells write trace output to stderr when run under 'set -x'.
Use test_i18ngrep instead of test_i18ncmp.
Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Test title says that tests are done with rebase.autostash unset,
but does not take any action to make sure that it is indeed unset.
This may lead to test failure if future changes somehow pollutes
the configuration globally.
Ensure consistent test conditions by explicitly unsetting
rebase.autostash.
Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
t5520: use consistent capitalization in test titles
Signed-off-by: Mehul Jain <mehul.jain2029@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jacob Nisnevich <jacob.nisnevich@gmail.com> Acked-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
mergetools: create mergetool_find_win32_cmd() helper function for winmerge
Signed-off-by: Jacob Nisnevich <jacob.nisnevich@gmail.com> Acked-by: David Aguilar <davvid@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The startup_info data, which records if we are working inside a
repository (among other things), are now uniformly available to Git
subcommand implementations, and Git avoids attempting to touch
references when we are not in a repository.
* jk/startup-info:
use setup_git_directory() in test-* programs
grep: turn off gitlink detection for --no-index
mailmap: do not resolve blobs in a non-repository
remote: don't resolve HEAD in non-repository
setup: set startup_info->have_repository more reliably
setup: make startup_info available everywhere
A test for tags has been restructured so that more parts of it can
easily be run on a platform without a working GnuPG.
* es/test-gpg-tags:
t6302: skip only signed tags rather than all tests when GPG is missing
t6302: also test annotated in addition to signed tags
t6302: normalize names and descriptions of signed tags
lib-gpg: drop unnecessary "missing GPG" warning
The "--local-env-vars" and "--resolve-git-dir" options of "git
rev-parse" failed to work outside a repository when the command's
option parsing was rewritten in 1.8.5 era.
* jk/rev-parse-local-env-vars:
rev-parse: let some options run outside repository
t1515: add tests for rev-parse out-of-repo helpers
"git config --get-urlmatch", unlike other variants of the "git
config --get" family, did not signal error with its exit status
when there was no matching configuration.
* jk/config-get-urlmatch:
Documentation/git-config: fix --get-all description
Documentation/git-config: use bulleted list for exit codes
config: fail if --get-urlmatch finds no value
The credential.helper configuration variable is cumulative and
there is no good way to override it from the command line. As
a special case, giving an empty string as its value now serves
as the signal to clear the values specified in various files.
* jk/credential-clear-config:
credential: let empty credential specs reset helper list
The end-user facing Porcelain level commands like "diff" and "log"
now enables the rename detection by default.
* mm/diff-renames-default:
diff: activate diff.renames by default
log: introduce init_log_defaults()
t: add tests for diff.renames (true/false/unset)
t4001-diff-rename: wrap file creations in a test
Documentation/diff-config: fix description of diff.renames
The link to Documentation/git-commandname.txt was obviously broken.
Remove the link and make it clear that it is not a literal path name by
using *italics* in makdown.
Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
The file was renamed in 4ad21f5 (README: use markdown syntax,
2016-02-25), but that commit forgot to update git.spec.in, which
caused the rpmbuild target in the Makefile to fail.
Reported-by: Ron Isaacson <isaacson.ljits@gmail.com> Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>
submodule--helper: do not borrow absolute_path() result for too long
absolute_path() is designed to allow its callers to take a brief
peek of the result (typically, to be fed to functions like
strbuf_add() and relative_path() as a parameter) without having to
worry about freeing it, but the other side of the coin of that
memory model is that the caller shouldn't rely too much on the
result living forever--there may be a helper function the caller
subsequently calls that makes its own call to absolute_path(),
invalidating the earlier result.
Use xstrdup() to make our own copy, and free(3) it when we are done.
While at it, remove an unnecessary sm_gitdir_rel variable that was
only used to as a parameter to call absolute_path() and never used
again.
submodule--helper, module_clone: always operate on absolute paths
When giving relative paths to `relative_path` to compute a relative path
from one directory to another, this may fail in `relative_path`.
Make sure both arguments to `relative_path` are always absolute.
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
In successful operation `write_pack_data` will close the `bundle_fd`,
but when we exit early, we need to take care of the file descriptor
as well as the lock file ourselves. The lock file may be deleted at the
end of running the program, but we are in library code, so we should
not rely on that.
Helped-by: Jeff King <peff@peff.net> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
`split` is of type `struct strbuf **`, and currently we are leaking split
itself as well as each element in split[i]. We have a dedicated free
function for `struct strbuf **`, which takes care of freeing all
related memory.
Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
notes: don't leak memory in git_config_get_notes_strategy
This function asks for the value of a configuration and after
using the value does not have to retain ownership of it.
git_config_get_string_const() however is a function to get a
copy of the value, but we forget to free it before we return.
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
forward = parse_binary_hunk(&buffer, &size, &status, &used);
if (!forward && !status)
/* there has to be one hunk (forward hunk) */
return error(_("unrecognized binary patch at line %d"), linenr-1);
so parse_binary() can return -1, because that's what error() returns.
Also parse_binary_hunk() sets "status" to -1 in case of error and
parse_binary() does "if (status) return status;".
In this case parse_chunk() should not add -1 to the patchsize it computes.
It is better for future libification efforts to make it just return -1.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git submodule update --init --recursive" uses full path to refer to
the true location of the repository in the "gitdir:" pointer for
nested submodules; the command used to use relative paths.
This was reported by Norio Nomura in $gmane/290280.
The root cause for that bug is in using recursive submodules as
their relative path handling was broken in ee8838d (2015-09-08,
submodule: rewrite `module_clone` shell function in C).
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-send-pack: fix --all option when used with directory
When using git send-pack with --all option
and a target repository specification ([<host>:]<directory>),
usage message is being displayed instead of performing
the actual transmission.
The reason for this issue is that destination and refspecs are being set
in the same conditional and are populated from argv. When a target
repository is passed, refspecs is being populated as well with its value.
This makes the check for refspecs not being NULL to always return true,
which, in conjunction with the check for --all or --mirror options,
is always true as well and returns usage message instead of proceeding.
This ensures that send-pack will stop execution only when --all
or --mirror switch is used in conjunction with any refspecs passed.
Signed-off-by: Stanislav Kolotinskiy <stanislav@assembla.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diffcore: fix iteration order of identical files during rename detection
If the two paths 'dir/A/file' and 'dir/B/file' have identical content
and the parent directory is renamed, e.g. 'git mv dir other-dir', then
diffcore reports the following exact renames:
While technically not wrong, this is confusing not only for the user,
but also for git commands that make decisions based on rename
information, e.g. 'git log --follow other-dir/A/file' follows
'dir/B/file' past the rename.
This behavior is a side effect of commit v2.0.0-rc4~8^2~14
(diffcore-rename.c: simplify finding exact renames, 2013-11-14): the
hashmap storing sources returns entries from the same bucket, i.e.
sources matching the current destination, in LIFO order. Thus the
iteration first examines 'other-dir/A/file' and 'dir/B/file' and, upon
finding identical content and basename, reports an exact rename.
Other hashmap users are apparently happy with the current iteration
order over the entries of a bucket. Changing the iteration order
would risk upsetting other hashmap users and would increase the memory
footprint of each bucket by a pointer to the tail element.
Fill the hashmap with source entries in reverse order to restore the
original exact rename detection behavior.
Reported-by: Bill Okara <billokara@gmail.com> Signed-off-by: SZEDER Gábor <szeder@ira.uka.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
submodule update: test recursive path reporting from subdirectory
This patch is just a test and fixes no bug as there is currently no bug
in the path handling of `submodule update`.
In `submodule update` we make a call to `submodule--helper list --prefix
"$wt_prefix"` which looks a bit brittle and likely to introduce a bug
for the path handling. It is not a bug as the prefix is ignored inside
the submodule helper for now. If this test breaks eventually, we want
to make sure the `wt_prefix` is passed correctly into recursive submodules.
Hint: In recursive submodules we expect `wt_prefix` to be empty.
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
submodule update: align reporting path for custom command execution
In the predefined actions (merge, rebase, none, checkout), we use
the display path, which is relative to the current working directory.
Also use the display path when running a custom command.
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
submodule status: correct path handling in recursive submodules
The new test which is a replica of the previous test except
that it executes from a sub directory. Prior to this patch
the test failed by having too many '../' prefixed:
The path code in question:
displaypath=$(relative_path "$prefix$sm_path")
prefix=$displaypath
if recursive:
eval cmd_status
That way we change `prefix` each iteration to contain another
'../', because of the the relative_path computation is done
on an already computed relative path.
We must call relative_path exactly once with `wt_prefix` non empty.
Further calls in recursive instances to to calculate the displaypath
already incorporate the correct prefix from before. Fix the issue by
clearing `wt_prefix` in recursive calls.
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
submodule update --init: correct path handling in recursive submodules
When calling `git submodule init` from a recursive instance of
`git submodule update --recursive`, the reported path is wrong as it
skips the nested submodules.
The new test demonstrates a failure in the code prior to this patch.
Instead of getting the expected
Submodule 'submodule' (${pwd}/submodule) registered for path '../super/submodule'
the `super` directory is omitted and you get
Submodule 'submodule' (${pwd}/submodule) registered for path '../submodule'
instead.
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
submodule foreach: correct path display in recursive submodules
The `prefix` was put in front of the display path unconditionally.
This is wrong as any relative path computation would need to be at
the front, so include the prefix into the display path.
The new test replicates the previous test with the difference of executing
from a sub directory. By executing from a sub directory all we would
expect all displayed paths to be prefixed by '../'.
Prior to this patch the test would report
Entering 'nested1/nested2/../nested3'
instead of the expected
Entering '../nested1/nested2/nested3'
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
When the local convention of the project is to use tab width that is
not 8, it may make sense to allow "git log --expand-tabs=<n>" to
tweak the output to match it.
pretty: enable --expand-tabs by default for selected pretty formats
"git log --pretty={medium,full,fuller}" and "git log" by default
prepend 4 spaces to the log message, so it makes sense to enable
the new "expand-tabs" facility by default for these formats.
Add --no-expand-tabs option to override the new default.
The change alone breaks a test in t4201 that runs "git shortlog"
on the output from "git log", and expects that the output from
"git log" does not do such a tab expansion. Adjust the test to
explicitly disable expand-tabs with --no-expand-tabs.
pretty: expand tabs in indented logs to make things line up properly
A commit log message sometimes tries to line things up using tabs,
assuming fixed-width font with the standard 8-place tab settings.
Viewing such a commit however does not work well in "git log", as
we indent the lines by prefixing 4 spaces in front of them.
This should all line up:
Column 1 Column 2
-------- --------
A B
ABCD EFGH
SPACES Instead of Tabs
Even with multi-byte UTF8 characters:
Column 1 Column 2
-------- --------
Ä B
åäö 100
A Møøse once bit my sister..
Tab-expand the lines in "git log --expand-tabs" output before
prefixing 4 spaces.
This is based on the patch by Linus Torvalds, but at this step, we
require an explicit command line option to enable the behaviour.
Signed-off-by: Sven Strickroth <sven@cs-ware.de> Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Acked-by: Sebastian Schuberth <sschuberth@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
MSVC: vsnprintf in Visual Studio 2015 doesn't need SNPRINTF_SIZE_CORR any more
In MSVC2015 the behavior of vsnprintf was changed.
W/o this fix there is one character missing at the end.
Signed-off-by: Sven Strickroth <sven@cs-ware.de> Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Acked-by: Sebastian Schuberth <sschuberth@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
branch -d: refuse deleting a branch which is currently checked out
When a branch is checked out by current working tree, deleting the
branch is forbidden. However when the branch is checked out only by
other working trees, deleting incorrectly succeeds.
Use find_shared_symref() to check if the branch is in use, not just
comparing with the current working tree's HEAD.
Helped-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Kazuki Yamaguchi <k@rhe.jp> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
By adding this option which defaults to true, we can use the
corresponding --no-checkout to make some customizations before
the checkout, like sparse checkout, etc.
Helped-by: Eric Sunshine <sunshine@sunshineco.com> Helped-by: Junio C Hamano <gitster@pobox.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Ray Zhang <zhanglei002@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
rebase-i: print an abbreviated hash when stop for editing
The message that is shown when rebase-i stops for editing prints
the full hash of the commit where it stopped which makes the message
overflow to the next line on smaller terminal windows. Print an
abbreviated hash instead.
Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
OPT_CMDMODE mechanism was introduced in the release of 1.8.5 to actively
notice when multiple "operation mode" options that specify mutually
incompatible operation modes are given.
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
At builtin/tag.c:23 French message translation, "<key-id>" was
translated to "<id-clé>", but at builtin/tag.c:355 "key-id" was
translated to "id de clé", hence an inconsistency in git tag -h output.
Translate "key-id" to "id-clé".
Alternatively, both places could use "id de clé" instead of "id-clé".
* js/mingw-tests-2.8:
mingw: skip some tests in t9115 due to file name issues
t1300: fix the new --show-origin tests on Windows
t1300-repo-config: make it resilient to being run via 'sh -x'
config --show-origin: report paths with forward slashes
The hashmap API provides hashmap_iter_first() helper for initialion
and getting the first entry of a hashmap. Let's use it instead of
doing initialization manually and then get the first entry.
There are no functional changes, just cleanup.
Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com> Reviewed-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
merge: refuse to create too cool a merge by default
While it makes sense to allow merging unrelated histories of two
projects that started independently into one, in the way "gitk" was
merged to "git" itself aka "the coolest merge ever", such a merge is
still an unusual event. Worse, if somebody creates an independent
history by starting from a tarball of an established project and
sends a pull request to the original project, "git merge" however
happily creates such a merge without any sign of something unusual
is happening.
Teach "git merge" to refuse to create such a merge by default,
unless the user passes a new "--allow-unrelated-histories" option to
tell it that the user is aware that two unrelated projects are
merged.
Because such a "two project merge" is a rare event, a configuration
option to always allow such a merge is not added.
We could add the same option to "git pull" and have it passed
through to underlying "git merge". I do not have a fundamental
opposition against such a feature, but this commit does not do so
and instead leaves it as low-hanging fruit for others, because such
a "two project merge" would be done after fetching the other project
into some location in the working tree of an existing project and
making sure how well they fit together, it is sufficient to allow a
local merge without such an option pass-through from "git pull" to
"git merge". Many tests that are updated by this patch does the
pass-through manually by turning:
merge: fix NULL pointer dereference when merging nothing into void
When we are on an unborn branch and merging only one foreign parent,
we allow "git merge" to fast-forward to that foreign parent commit.
This codepath incorrectly attempted to dereference the list of
parents that the merge is going to record even when the list is
empty. It must refuse to operate instead when there is no parent.
All other codepaths make sure the list is not empty before they
dereference it, and are safe.
Reported-by: Jose Ivan B. Vilarouca Filho Signed-off-by: Junio C Hamano <gitster@pobox.com>
Noticed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>