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git-pull last updated in 2.55.0
NAME
git-pull - Fetch from and integrate with another repository or a local branch
SYNOPSIS
git pull [<options>] [<repository> [<refspec>…]]
DESCRIPTION
Integrate changes from a remote repository into the current branch.
First, git pull runs git fetch with the same arguments
(excluding merge options) to fetch remote branch(es).
Then it decides which remote branch to integrate: if you run git pull
with no arguments this defaults to the upstream
for the current branch.
Then it integrates that branch into the current branch.
There are 4 main options for integrating the remote branch:
-
git pull --ff-only will only do "fast-forward" updates: it
fails if your local branch has diverged from the remote branch.
This is the default.
-
git pull --rebase runs git rebase
-
git pull --no-rebase runs git merge.
-
git pull --squash runs git merge --squash
You can also set the configuration options pull.rebase, pull.squash,
or pull.ff with your preferred behaviour.
If there’s a merge conflict during the merge or rebase that you don’t
want to handle, you can safely abort it with git merge --abort or
git rebase --abort.
OPTIONS
- <repository>
-
The "remote" repository to pull from. This can be either
a URL (see the section GIT URLS below) or the name
of a remote (see the section REMOTES below).
Defaults to the configured upstream for the current branch, or origin.
See UPSTREAM BRANCHES below for more on how to
configure upstreams.
- <refspec>
-
Which branch or other reference(s) to fetch and integrate into the
current branch, for example main in git pull origin main.
Defaults to the configured upstream for the current branch.
This can be a branch, tag, or other collection of reference(s).
See <refspec> below under "Options related to fetching"
for the full syntax, and DEFAULT BEHAVIOUR below
for how git pull uses this argument to determine which remote branch
to integrate.
-q
--quiet
-
This is passed to both underlying git-fetch to squelch reporting of
during transfer, and underlying git-merge to squelch output during
merging.
-v
--verbose
-
Pass --verbose to git-fetch and git-merge.
--recurse-submodules[=(yes|on-demand|no)]
--no-recurse-submodules
-
This option controls if new commits of populated submodules should
be fetched, and if the working trees of active submodules should be
updated, too (see git-fetch[1], git-config[1] and
gitmodules[5]).
If the checkout is done via rebase, local submodule commits are rebased as well.
If the update is done via merge, the submodule conflicts are resolved and checked out.
Options related to merging
--commit
--no-commit
-
Perform the merge and commit the result. This option can
be used to override --no-commit.
Only useful when merging.
With --no-commit perform the merge and stop just before creating
a merge commit, to give the user a chance to inspect and further
tweak the merge result before committing.
Note that fast-forward updates do not create a merge commit and
therefore there is no way to stop those merges with --no-commit.
Thus, if you want to ensure your branch is not changed or updated
by the merge command, use --no-ff with --no-commit.
--edit
-e
--no-edit
-
Invoke an editor before committing successful mechanical merge to
further edit the auto-generated merge message, so that the user
can explain and justify the merge. The --no-edit option can be
used to accept the auto-generated message (this is generally
discouraged).
Older scripts may depend on the historical behaviour of not allowing the
user to edit the merge log message. They will see an editor opened when
they run git merge. To make it easier to adjust such scripts to the
updated behaviour, the environment variable GIT_MERGE_AUTOEDIT can be
set to no at the beginning of them.
--cleanup=<mode>
-
This option determines how the merge message will be cleaned up before
committing. See git-commit[1] for more details. In addition, if
the <mode> is given a value of scissors, scissors will be appended
to MERGE_MSG before being passed on to the commit machinery in the
case of a merge conflict.
--ff-only
-
Only update to the new history if there is no divergent local
history. This is the default when no method for reconciling
divergent histories is provided (via the --rebase flags).
--ff
--no-ff
-
When merging rather than rebasing, specifies how a merge is
handled when the merged-in history is already a descendant of
the current history. If merging is requested, --ff is the
default unless merging an annotated (and possibly signed) tag
that is not stored in its natural place in the refs/tags/
hierarchy, in which case --no-ff is assumed.
With --ff, when possible resolve the merge as a fast-forward (only
update the branch pointer to match the merged branch; do not create a
merge commit). When not possible (when the merged-in history is not a
descendant of the current history), create a merge commit.
With --no-ff, create a merge commit in all cases, even when the merge
could instead be resolved as a fast-forward.
-S[<key-id>]
--gpg-sign[=<key-id>]
--no-gpg-sign
-
GPG-sign the resulting merge commit. The <key-id> argument is
optional and defaults to the committer identity; if specified,
it must be stuck to the option without a space. --no-gpg-sign
is useful to countermand both commit.gpgSign configuration variable,
and earlier --gpg-sign.
--log[=<n>]
--no-log
-
In addition to branch names, populate the log message with
one-line descriptions from at most <n> actual commits that are being
merged. See also git-fmt-merge-msg[1].
Only useful when merging.
With --no-log do not list one-line descriptions from the
actual commits being merged.
--signoff
--no-signoff
-
Add a Signed-off-by trailer by the committer at the end of the commit
log message. The meaning of a signoff depends on the project
to which you’re committing. For example, it may certify that
the committer has the rights to submit the work under the
project’s license or agrees to some contributor representation,
such as a Developer Certificate of Origin.
(See https://developercertificate.org for the one used by the
Linux kernel and Git projects.) Consult the documentation or
leadership of the project to which you’re contributing to
understand how the signoffs are used in that project.
The --no-signoff option can be used to countermand an earlier --signoff
option on the command line.
Git does not (and will not) have a configuration variable to enable
the --signoff command line option by default; see the
commit.signoff entry in gitfaq[7] for more details.
--stat
-n
--no-stat
-
Show a diffstat at the end of the merge. The diffstat is also
controlled by the configuration option merge.stat.
With -n or --no-stat do not show a diffstat at the end of the
merge.
--compact-summary
-
Show a compact-summary at the end of the merge.
--squash
--no-squash
-
Produce the working tree and index state as if a real merge
happened (except for the merge information), but do not actually
make a commit, move the HEAD, or record $GIT_DIR/MERGE_HEAD
(to cause the next git commit command to create a merge
commit). This allows you to create a single commit on top of
the current branch whose effect is the same as merging another
branch (or more in case of an octopus).
With --no-squash perform the merge and commit the result. This
option can be used to override --squash.
With --squash, --commit is not allowed, and will fail.
Only useful when merging.
--verify
--no-verify
-
By default, the pre-merge and commit-msg hooks are run.
When --no-verify is given, these are bypassed.
See also githooks[5].
Only useful when merging.
-s <strategy>
--strategy=<strategy>
-
Use the given merge strategy; can be supplied more than
once to specify them in the order they should be tried.
If there is no -s option, a built-in list of strategies
is used instead (ort when merging a single head,
octopus otherwise).
-X <option>
--strategy-option=<option>
-
Pass merge strategy specific option through to the merge
strategy.
--verify-signatures
--no-verify-signatures
-
Verify that the tip commit of the side branch being merged is
signed with a valid key, i.e. a key that has a valid uid: in the
default trust model, this means the signing key has been signed by
a trusted key. If the tip commit of the side branch is not signed
with a valid key, the merge is aborted.
Only useful when merging.
--summary
--no-summary
-
Synonyms to --stat and --no-stat; these are deprecated and will be
removed in the future.
--autostash
--no-autostash
-
Automatically create a temporary stash entry before the operation
begins, record it in the ref MERGE_AUTOSTASH
and apply it after the operation ends. This means
that you can run the operation on a dirty worktree. However, use
with care: the final stash application after a successful
merge might result in non-trivial conflicts.
--allow-unrelated-histories
-
By default, git merge command refuses to merge histories
that do not share a common ancestor. This option can be
used to override this safety when merging histories of two
projects that started their lives independently. As that is
a very rare occasion, no configuration variable to enable
this by default exists or will be added.
Only useful when merging.
-r
--rebase[=(true|merges|false|interactive)]
-
true
-
rebase the current branch on top of the upstream
branch after fetching. If there is a remote-tracking branch
corresponding to the upstream branch and the upstream branch
was rebased since last fetched, the rebase uses that information
to avoid rebasing non-local changes. This is the default.
merges
-
rebase using git rebase --rebase-merges so that
the local merge commits are included in the rebase (see
git-rebase[1] for details).
false
-
merge the upstream branch into the current branch.
interactive
-
enable the interactive mode of rebase.
See pull.rebase, branch.<name>.rebase and branch.autoSetupRebase in
git-config[1] if you want to make git pull always use
--rebase instead of merging.
|
Note
|
This is a potentially dangerous mode of operation.
It rewrites history, which does not bode well when you
published that history already. Do not use this option
unless you have read git-rebase[1] carefully.
|
--no-rebase
-
This is shorthand for --rebase=false.
Options related to fetching
--all
--no-all
-
Fetch all remotes, except for the ones that have the
remote.<name>.skipFetchAll configuration variable set.
This overrides the configuration variable fetch.all.
-a
--append
-
Append ref names and object names of fetched refs to the
existing contents of .git/FETCH_HEAD. Without this
option old data in .git/FETCH_HEAD will be overwritten.
--atomic
-
Use an atomic transaction to update local refs. Either all refs are
updated, or on error, no refs are updated.
--depth=<depth>
-
Limit fetching to the specified number of commits from the tip of
each remote branch history. If fetching to a shallow repository
created by git clone with --depth=<depth> option (see
git-clone[1]), deepen or shorten the history to the specified
number of commits. Tags for the deepened commits are not fetched.
--deepen=<depth>
-
Similar to --depth, except it specifies the number of commits
from the current shallow boundary instead of from the tip of
each remote branch history.
--shallow-since=<date>
-
Deepen or shorten the history of a shallow repository to
include all reachable commits after <date>.
--shallow-exclude=<ref>
-
Deepen or shorten the history of a shallow repository to
exclude commits reachable from a specified remote branch or tag.
This option can be specified multiple times.
--unshallow
-
If the source repository is complete, convert a shallow
repository to a complete one, removing all the limitations
imposed by shallow repositories.
If the source repository is shallow, fetch as much as possible so that
the current repository has the same history as the source repository.
--update-shallow
-
By default when fetching from a shallow repository,
git fetch refuses refs that require updating
.git/shallow. This option updates .git/shallow and accepts such
refs.
--negotiation-restrict=(<commit>|<glob>)
--negotiation-tip=(<commit>|<glob>)
-
By default, Git will report, to the server, commits reachable
from all local refs to find common commits in an attempt to
reduce the size of the to-be-received packfile. If specified,
Git will only report commits reachable from the given tips.
This is useful to speed up fetches when the user knows which
local ref is likely to have commits in common with the
upstream ref being fetched.
--negotiation-restrict is the preferred name for this option;
--negotiation-tip is accepted as a synonym.
This option may be specified more than once; if so, Git will report
commits reachable from any of the given commits.
The argument to this option may be a glob on ref names, a ref, or the (possibly
abbreviated) SHA-1 of a commit. Specifying a glob is equivalent to specifying
this option multiple times, one for each matching ref name.
See also the fetch.negotiationAlgorithm and push.negotiate
configuration variables documented in git-config[1], and the
--negotiate-only option below.
--negotiation-include=(<commit>|<glob>)
-
Ensure that the commits at the given tips are always sent as "have"
lines during fetch negotiation, regardless of what the negotiation
algorithm selects. This is useful to guarantee that common
history reachable from specific refs is always considered, even
when --negotiation-restrict restricts the set of tips or when
the negotiation algorithm would otherwise skip them.
This option may be specified more than once; if so, each commit is sent
unconditionally.
The argument may be an exact ref name (e.g. refs/heads/release), an
object hash, or a glob pattern (e.g. refs/heads/release/{asterisk}).
The pattern syntax is the same as for --negotiation-restrict.
If --negotiation-restrict is used, the have set is first restricted by
that option and then increased to include the tips specified by
--negotiation-include.
If this option is not specified on the command line, then any
remote.<name>.negotiationInclude config values for the current remote
are used instead.
--negotiate-only
-
Do not fetch anything from the server, and instead print the
ancestors of the provided --negotiation-restrict= arguments,
which we have in common with the server.
This is incompatible with --recurse-submodules=(yes|on-demand).
Internally this is used to implement the push.negotiate option, see
git-config[1].
--dry-run
-
Show what would be done, without making any changes.
--porcelain
-
Print the output to standard output in an easy-to-parse format for
scripts. See section OUTPUT in git-fetch[1] for details.
This is incompatible with --recurse-submodules=(yes|on-demand) and takes
precedence over the fetch.output config option.
--filter=<filter-spec>
-
Use the partial clone feature and request that the server sends
a subset of reachable objects according to a given object filter.
When using --filter, the supplied <filter-spec> is used for
the partial fetch.
If --filter=auto is used, the filter specification is determined
automatically by combining the filter specifications advertised by
the server for the promisor remotes that the client accepts (see
gitprotocol-v2[5] and the promisor.acceptFromServer
configuration option in git-config[1]).
For details on all other available filter specifications, see the
--filter=<filter-spec> option in git-rev-list[1].
For example, --filter=blob:none will filter out all blobs (file
contents) until needed by Git. Also, --filter=blob:limit=<size> will
filter out all blobs of size at least <size>.
-f
--force
-
When git fetch is used with <src>:<dst> refspec, it may
refuse to update the local branch as discussed
in the <refspec> part of the git-fetch[1]
documentation.
This option overrides that check.
-k
--keep
-
Keep downloaded pack.
--prefetch
-
Modify the configured refspec to place all refs into the
refs/prefetch/ namespace. See the prefetch task in
git-maintenance[1].
-p
--prune
-
Before fetching, remove any remote-tracking references that no
longer exist on the remote. Tags are not subject to pruning
if they are fetched only because of the default tag
auto-following or due to a --tags option. However, if tags
are fetched due to an explicit refspec (either on the command
line or in the remote configuration, for example if the remote
was cloned with the --mirror option), then they are also
subject to pruning. Supplying --prune-tags is a shorthand for
providing the tag refspec.
--no-tags
-
By default, tags that point at objects that are downloaded
from the remote repository are fetched and stored locally.
This option disables this automatic tag following. The default
behavior for a remote may be specified with the remote.<name>.tagOpt
setting. See git-config[1].
--refmap=<refspec>
-
When fetching refs listed on the command line, use the
specified refspec (can be given more than once) to map the
refs to remote-tracking branches, instead of the values of
remote.<name>.fetch configuration variables for the remote
repository. Providing an empty <refspec> to the
--refmap option causes Git to ignore the configured
refspecs and rely entirely on the refspecs supplied as
command-line arguments. See section on "Configured Remote-tracking
Branches" for details.
-t
--tags
-
Fetch all tags from the remote (i.e., fetch remote tags
refs/tags/* into local tags with the same name), in addition
to whatever else would otherwise be fetched. Using this
option alone does not subject tags to pruning, even if --prune
is used (though tags may be pruned anyway if they are also the
destination of an explicit refspec; see --prune).
-j <n>
--jobs=<n>
-
Parallelize all forms of fetching up to <n> jobs at a time.
A value of 0 will use some reasonable default.
If the --multiple option was specified, the different remotes will be fetched
in parallel. If multiple submodules are fetched, they will be fetched in
parallel. To control them independently, use the config settings
fetch.parallel and submodule.fetchJobs (see git-config[1]).
Typically, parallel recursive and multi-remote fetches will be faster. By
default fetches are performed sequentially, not in parallel.
--set-upstream
-
If the remote is fetched successfully, add upstream
(tracking) reference, used by argument-less
git-pull[1] and other commands. For more information,
see branch.<name>.merge and branch.<name>.remote in
git-config[1].
--upload-pack <upload-pack>
-
When given, and the repository to fetch from is handled
by git fetch-pack, --exec=<upload-pack> is passed to
the command to specify non-default path for the command
run on the other end.
--progress
-
Progress status is reported on the standard error stream
by default when it is attached to a terminal, unless -q
is specified. This flag forces progress status even if the
standard error stream is not directed to a terminal.
-o <option>
--server-option=<option>
-
Transmit the given string to the server when communicating using
protocol version 2. The given string must not contain a NUL or LF
character. The server’s handling of server options, including
unknown ones, is server-specific.
When multiple --server-option=<option> are given, they are all
sent to the other side in the order listed on the command line.
When no --server-option=<option> is given from the command line,
the values of configuration variable remote.<name>.serverOption
are used instead.
--show-forced-updates
-
By default, git checks if a branch is force-updated during
fetch. This can be disabled through fetch.showForcedUpdates, but
the --show-forced-updates option guarantees this check occurs.
See git-config[1].
--no-show-forced-updates
-
By default, git checks if a branch is force-updated during
fetch. Pass --no-show-forced-updates or set fetch.showForcedUpdates
to false to skip this check for performance reasons. If used during
git-pull the --ff-only option will still check for forced updates
before attempting a fast-forward update. See git-config[1].
-4
--ipv4
-
Use IPv4 addresses only, ignoring IPv6 addresses.
-6
--ipv6
-
Use IPv6 addresses only, ignoring IPv4 addresses.
- <repository>
-
The "remote" repository that is the source of a fetch
or pull operation. This parameter can be either a URL
(see the section GIT URLS below) or the name
of a remote (see the section REMOTES below).
- <refspec>
-
Specifies which refs to fetch and which local refs to update.
When no <refspec>s appear on the command line, the refs to fetch
are read from remote.<repository>.fetch variables instead
(see the section "CONFIGURED REMOTE-TRACKING BRANCHES"
in git-fetch[1]).
The format of a <refspec> parameter is an optional plus
+, followed by the source <src>, followed
by a colon :, followed by the destination <dst>.
The colon can be omitted when <dst> is empty. <src> is
typically a ref, or a glob pattern with a single * that is used
to match a set of refs, but it can also be a fully spelled hex object
name.
A <refspec> may contain a * in its <src> to indicate a simple pattern
match. Such a refspec functions like a glob that matches any ref with the
pattern. A pattern <refspec> must have one and only one * in both the <src> and
<dst>. It will map refs to the destination by replacing the * with the
contents matched from the source.
If a refspec is prefixed by ^, it will be interpreted as a negative
refspec. Rather than specifying which refs to fetch or which local refs to
update, such a refspec will instead specify refs to exclude. A ref will be
considered to match if it matches at least one positive refspec, and does
not match any negative refspec. Negative refspecs can be useful to restrict
the scope of a pattern refspec so that it will not include specific refs.
Negative refspecs can themselves be pattern refspecs. However, they may only
contain a <src> and do not specify a <dst>. Fully spelled out hex object
names are also not supported.
tag <tag> means the same as refs/tags/<tag>:refs/tags/<tag>;
it requests fetching everything up to the given tag.
The remote ref that matches <src>
is fetched, and if <dst> is not an empty string, an attempt
is made to update the local ref that matches it.
Whether that update is allowed without --force depends on the ref
namespace it’s being fetched to, the type of object being fetched, and
whether the update is considered to be a fast-forward. Generally, the
same rules apply for fetching as when pushing, see the <refspec>...
section of git-push[1] for what those are. Exceptions to those
rules particular to git fetch are noted below.
Until Git version 2.20, and unlike when pushing with
git-push[1], any updates to refs/tags/* would be accepted
without + in the refspec (or --force). When fetching, we promiscuously
considered all tag updates from a remote to be forced fetches. Since
Git version 2.20, fetching to update refs/tags/* works the same way
as when pushing. I.e. any updates will be rejected without + in the
refspec (or --force).
Unlike when pushing with git-push[1], any updates outside of
refs/{tags,heads}/* will be accepted without + in the refspec (or
--force), whether that’s swapping e.g. a tree object for a blob, or
a commit for another commit that doesn’t have the previous commit as
an ancestor etc.
Unlike when pushing with git-push[1], there is no
configuration which’ll amend these rules, and nothing like a
pre-fetch hook analogous to the pre-receive hook.
As with pushing with git-push[1], all of the rules described
above about what’s not allowed as an update can be overridden by
adding an optional leading + to a refspec (or using the --force
command line option). The only exception to this is that no amount of
forcing will make the refs/heads/* namespace accept a non-commit
object.
|
Note
|
When the remote branch you want to fetch is known to
be rewound and rebased regularly, it is expected that
its new tip will not be a descendant of its previous tip
(as stored in your remote-tracking branch the last time
you fetched). You would want
to use the + sign to indicate non-fast-forward updates
will be needed for such branches. There is no way to
determine or declare that a branch will be made available
in a repository with this behavior; the pulling user simply
must know this is the expected usage pattern for a branch.
|
|
Note
|
There is a difference between listing multiple <refspec>
directly on git pull command line and having multiple
remote.<repository>.fetch entries in your configuration
for a <repository> and running a
git pull command without any explicit <refspec> parameters.
<refspec>s listed explicitly on the command line are always
merged into the current branch after fetching. In other words,
if you list more than one remote ref, git pull will create
an Octopus merge. On the other hand, if you do not list any
explicit <refspec> parameter on the command line, git pull
will fetch all the <refspec>s it finds in the
remote.<repository>.fetch configuration and merge
only the first <refspec> found into the current branch.
This is because making an
Octopus from remote refs is rarely done, while keeping track
of multiple remote heads in one-go by fetching more than one
is often useful.
|
GIT URLS
In general, URLs contain information about the transport protocol, the
address of the remote server, and the path to the repository.
Depending on the transport protocol, some of this information may be
absent.
Git supports ssh, git, http, and https protocols (in addition, ftp
and ftps can be used for fetching, but this is inefficient and
deprecated; do not use them).
The native transport (i.e. git:// URL) does no authentication and
should be used with caution on unsecured networks.
The following syntaxes may be used with them:
-
ssh://[<user>@]<host>[:<port>]/<path-to-git-repo>
-
git://<host>[:<port>]/<path-to-git-repo>
-
http[s]://<host>[:<port>]/<path-to-git-repo>
-
ftp[s]://<host>[:<port>]/<path-to-git-repo>
An alternative scp-like syntax may also be used with the ssh protocol:
This syntax is only recognized if there are no slashes before the
first colon. This helps differentiate a local path that contains a
colon. For example the local path foo:bar could be specified as an
absolute path or ./foo:bar to avoid being misinterpreted as an ssh
url.
The ssh and git protocols additionally support ~<username> expansion:
-
ssh://[<user>@]<host>[:<port>]/~<user>/<path-to-git-repo>
-
git://<host>[:<port>]/~<user>/<path-to-git-repo>
-
[<user>@]<host>:~<user>/<path-to-git-repo>
For local repositories, also supported by Git natively, the following
syntaxes may be used:
These two syntaxes are mostly equivalent, except when cloning, when
the former implies --local option. See git-clone[1] for
details.
git clone, git fetch and git pull, but not git push, will also
accept a suitable bundle file. See git-bundle[1].
When Git doesn’t know how to handle a certain transport protocol, it
attempts to use the remote-<transport> remote helper, if one
exists. To explicitly request a remote helper, the following syntax
may be used:
where <address> may be a path, a server and path, or an arbitrary
URL-like string recognized by the specific remote helper being
invoked. See gitremote-helpers[7] for details.
If there are a large number of similarly-named remote repositories and
you want to use a different format for them (such that the URLs you
use will be rewritten into URLs that work), you can create a
configuration section of the form:
[url "<actual-url-base>"]
insteadOf = <other-url-base>
[url "git://git.host.xz/"]
insteadOf = host.xz:/path/to/
insteadOf = work:
a URL like "work:repo.git" or like "host.xz:/path/to/repo.git" will be
rewritten in any context that takes a URL to be "git://git.host.xz/repo.git".
If you want to rewrite URLs for push only, you can create a
configuration section of the form:
[url "<actual-url-base>"]
pushInsteadOf = <other-url-base>
[url "ssh://example.org/"]
pushInsteadOf = git://example.org/
a URL like "git://example.org/path/to/repo.git" will be rewritten to
"ssh://example.org/path/to/repo.git" for pushes, but pulls will still
use the original URL.
REMOTES
The name of one of the following can be used instead
of a URL as <repository> argument:
-
a remote in the Git configuration file: $GIT_DIR/config,
-
a file in the $GIT_DIR/remotes directory, or
-
a file in the $GIT_DIR/branches directory.
All of these also allow you to omit the refspec from the command line
because they each contain a refspec which git will use by default.
Named remote in configuration file
You can choose to provide the name of a remote which you had previously
configured using git-remote[1], git-config[1]
or even by a manual edit to the $GIT_DIR/config file. The URL of
this remote will be used to access the repository. The refspec
of this remote will be used by default when you do
not provide a refspec on the command line. The entry in the
config file would appear like this:
[remote "<name>"]
url = <URL>
pushurl = <pushurl>
push = <refspec>
fetch = <refspec>
The <pushurl> is used for pushes only. It is optional and defaults
to <URL>. Pushing to a remote affects all defined pushurls or all
defined urls if no pushurls are defined. Fetch, however, will only
fetch from the first defined url if multiple urls are defined.
Named file in $GIT_DIR/remotes
You can choose to provide the name of a
file in $GIT_DIR/remotes. The URL
in this file will be used to access the repository. The refspec
in this file will be used as default when you do not
provide a refspec on the command line. This file should have the
following format:
URL: one of the above URL formats
Push: <refspec>
Pull: <refspec>
Push: lines are used by git push and
Pull: lines are used by git pull and git fetch.
Multiple Push: and Pull: lines may
be specified for additional branch mappings.
Named file in $GIT_DIR/branches
You can choose to provide the name of a
file in $GIT_DIR/branches.
The URL in this file will be used to access the repository.
This file should have the following format:
<URL> is required; #<head> is optional.
Depending on the operation, git will use one of the following
refspecs, if you don’t provide one on the command line.
<branch> is the name of this file in $GIT_DIR/branches and
<head> defaults to master.
refs/heads/<head>:refs/heads/<branch>
UPSTREAM BRANCHES
Branches in Git can optionally have an upstream remote branch.
Git defaults to using the upstream branch for remote operations, for example:
-
It’s the default for git pull or git fetch with no arguments.
-
It’s the default for git push with no arguments, with some exceptions.
For example, you can use the branch.<name>.pushRemote option to push
to a different remote than you pull from, and by default with
push.default=simple the upstream branch you configure must have
the same name.
-
Various commands, including git checkout and git status, will
show you how many commits have been added to your current branch and
the upstream since you forked from it, for example "Your branch and
origin/main have diverged, and have 2 and 3 different commits each
respectively".
The upstream is stored in .git/config, in the "remote" and "merge"
fields. For example, if main's upstream is origin/main:
[branch "main"]
remote = origin
merge = refs/heads/main
You can set an upstream branch explicitly with
git push --set-upstream <remote> <branch>
but Git will often automatically set the upstream for you, for example:
-
When you clone a repository, Git will automatically set the upstream
for the default branch.
-
If you have the push.autoSetupRemote configuration option set,
git push will automatically set the upstream the first time you push
a branch.
-
Checking out a remote-tracking branch with git checkout <branch>
will automatically create a local branch with that name and set
the upstream to the remote branch.
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Note
|
Upstream branches are sometimes referred to as "tracking information",
as in "set the branch’s tracking information".
|
MERGE STRATEGIES
The merge mechanism (git merge and git pull commands) allows the
backend merge strategies to be chosen with -s option. Some strategies
can also take their own options, which can be passed by giving -X<option>
arguments to git merge and/or git pull.
ort
-
This is the default merge strategy when pulling or merging one
branch. This strategy can only resolve two heads using a
3-way merge algorithm. When there is more than one common
ancestor that can be used for 3-way merge, it creates a merged
tree of the common ancestors and uses that as the reference
tree for the 3-way merge. This has been reported to result in
fewer merge conflicts without causing mismerges by tests done
on actual merge commits taken from Linux 2.6 kernel
development history. Additionally this strategy can detect
and handle merges involving renames. It does not make use of
detected copies. The name for this algorithm is an acronym
("Ostensibly Recursive’s Twin") and came from the fact that it
was written as a replacement for the previous default
algorithm, recursive.
In the case where the path is a submodule, if the submodule commit used on
one side of the merge is a descendant of the submodule commit used on the
other side of the merge, Git attempts to fast-forward to the
descendant. Otherwise, Git will treat this case as a conflict, suggesting
as a resolution a submodule commit that is descendant of the conflicting
ones, if one exists.
The ort strategy can take the following options:
ours
-
This option forces conflicting hunks to be auto-resolved cleanly by
favoring our version. Changes from the other tree that do not
conflict with our side are reflected in the merge result.
For a binary file, the entire contents are taken from our side.
This should not be confused with the ours merge strategy, which does not
even look at what the other tree contains at all. It discards everything
the other tree did, declaring our history contains all that happened in it.
theirs
-
This is the opposite of ours; note that, unlike ours, there is
no theirs merge strategy to confuse this merge option with.
ignore-space-change
ignore-all-space
ignore-space-at-eol
ignore-cr-at-eol
-
Treats lines with the indicated type of whitespace change as
unchanged for the sake of a three-way merge. Whitespace
changes mixed with other changes to a line are not ignored.
See also git-diff[1] -b, -w,
--ignore-space-at-eol, and --ignore-cr-at-eol.
-
If their version only introduces whitespace changes to a line,
our version is used;
-
If our version introduces whitespace changes but their
version includes a substantial change, their version is used;
-
Otherwise, the merge proceeds in the usual way.
renormalize
-
This runs a virtual check-out and check-in of all three stages
of any file which needs a three-way merge. This option is
meant to be used when merging branches with different clean
filters or end-of-line normalization rules. See "Merging
branches with differing checkin/checkout attributes" in
gitattributes[5] for details.
no-renormalize
-
Disables the renormalize option. This overrides the
merge.renormalize configuration variable.
find-renames[=<n>]
-
Turn on rename detection, optionally setting the similarity
threshold. This is the default. This overrides the
merge.renames configuration variable.
See also git-diff[1] --find-renames.
rename-threshold=<n>
-
Deprecated synonym for find-renames=<n>.
no-renames
-
Turn off rename detection. This overrides the merge.renames
configuration variable.
See also git-diff[1] --no-renames.
histogram
-
Deprecated synonym for diff-algorithm=histogram.
patience
-
Deprecated synonym for diff-algorithm=patience.
diff-algorithm=(histogram|minimal|myers|patience)
-
Use a different diff algorithm while merging, which can help
avoid mismerges that occur due to unimportant matching lines
(such as braces from distinct functions). See also
git-diff[1] --diff-algorithm. Note that ort
defaults to diff-algorithm=histogram, while regular diffs
currently default to the diff.algorithm config setting.
subtree[=<path>]
-
This option is a more advanced form of subtree strategy, where
the strategy makes a guess on how two trees must be shifted to
match with each other when merging. Instead, the specified path
is prefixed (or stripped from the beginning) to make the shape of
two trees to match.
recursive
-
This is now a synonym for ort. It was an alternative
implementation until v2.49.0, but was redirected to mean ort
in v2.50.0. The previous recursive strategy was the default
strategy for resolving two heads from Git v0.99.9k until
v2.33.0.
resolve
-
This can only resolve two heads (i.e. the current branch
and another branch you pulled from) using a 3-way merge
algorithm. It tries to carefully detect criss-cross
merge ambiguities. It does not handle renames.
octopus
-
This resolves cases with more than two heads, but refuses to do
a complex merge that needs manual resolution. It is
primarily meant to be used for bundling topic branch
heads together. This is the default merge strategy when
pulling or merging more than one branch.
ours
-
This resolves any number of heads, but the resulting tree of the
merge is always that of the current branch head, effectively
ignoring all changes from all other branches. It is meant to
be used to supersede old development history of side
branches. Note that this is different from the -Xours option to
the ort merge strategy.
subtree
-
This is a modified ort strategy. When merging trees A and
B, if B corresponds to a subtree of A, B is first adjusted to
match the tree structure of A, instead of reading the trees at
the same level. This adjustment is also done to the common
ancestor tree.
With the strategies that use 3-way merge (including the default, ort),
if a change is made on both branches, but later reverted on one of the
branches, that change will be present in the merged result; some people find
this behavior confusing. It occurs because only the heads and the merge base
are considered when performing a merge, not the individual commits. The merge
algorithm therefore considers the reverted change as no change at all, and
substitutes the changed version instead.
DEFAULT BEHAVIOUR
Often people use git pull without giving any parameter.
Traditionally, this has been equivalent to saying git pull
origin. However, when configuration branch.<name>.remote is
present while on branch <name>, that value is used instead of
origin.
In order to determine what URL to use to fetch from, the value
of the configuration remote.<origin>.url is consulted
and if there is not any such variable, the value on the URL: line
in $GIT_DIR/remotes/<origin> is used.
In order to determine what remote branches to fetch (and
optionally store in the remote-tracking branches) when the command is
run without any refspec parameters on the command line, values
of the configuration variable remote.<origin>.fetch are
consulted, and if there aren’t any, $GIT_DIR/remotes/<origin>
is consulted and its Pull: lines are used.
In addition to the refspec formats described in the OPTIONS
section, you can have a globbing refspec that looks like this:
refs/heads/*:refs/remotes/origin/*
A globbing refspec must have a non-empty RHS (i.e. must store
what were fetched in remote-tracking branches), and its LHS and RHS
must end with /*. The above specifies that all remote
branches are tracked using remote-tracking branches in
refs/remotes/origin/ hierarchy under the same name.
The rule to determine which remote branch to merge after
fetching is a bit involved, in order not to break backward
compatibility.
If explicit refspecs were given on the command
line of git pull, they are all merged.
When no refspec was given on the command line, then git pull
uses the refspec from the configuration or
$GIT_DIR/remotes/<origin>. In such cases, the following
rules apply:
-
If branch.<name>.merge configuration for the current
branch <name> exists, that is the name of the branch at the
remote site that is merged.
-
If the refspec is a globbing one, nothing is merged.
-
Otherwise the remote branch of the first refspec is merged.
EXAMPLES
-
Update the remote-tracking branches for the repository
you cloned from, then merge one of them into your
current branch:
$ git pull
$ git pull origin
Normally the branch merged in is the HEAD of the remote repository,
but the choice is determined by the branch.<name>.remote and
branch.<name>.merge options; see git-config[1] for details.
-
Merge into the current branch the remote branch next:
This leaves a copy of next temporarily in FETCH_HEAD, and
updates the remote-tracking branch origin/next.
The same can be done by invoking fetch and merge:
$ git fetch origin
$ git merge origin/next
If you tried a pull which resulted in complex conflicts and
would want to start over, you can recover with git reset.
SECURITY
The fetch and push protocols are not designed to prevent one side from
stealing data from the other repository that was not intended to be
shared. If you have private data that you need to protect from a malicious
peer, your best option is to store it in another repository. This applies
to both clients and servers. In particular, namespaces on a server are not
effective for read access control; you should only grant read access to a
namespace to clients that you would trust with read access to the entire
repository.
The known attack vectors are as follows:
-
The victim sends "have" lines advertising the IDs of objects it has that
are not explicitly intended to be shared but can be used to optimize the
transfer if the peer also has them. The attacker chooses an object ID X
to steal and sends a ref to X, but isn’t required to send the content of
X because the victim already has it. Now the victim believes that the
attacker has X, and it sends the content of X back to the attacker
later. (This attack is most straightforward for a client to perform on a
server, by creating a ref to X in the namespace the client has access
to and then fetching it. The most likely way for a server to perform it
on a client is to "merge" X into a public branch and hope that the user
does additional work on this branch and pushes it back to the server
without noticing the merge.)
-
As in #1, the attacker chooses an object ID X to steal. The victim sends
an object Y that the attacker already has, and the attacker falsely
claims to have X and not Y, so the victim sends Y as a delta against X.
The delta reveals regions of X that are similar to Y to the attacker.
BUGS
Using --recurse-submodules can only fetch new commits in already checked
out submodules right now. When e.g. upstream added a new submodule in the
just fetched commits of the superproject the submodule itself cannot be
fetched, making it impossible to check out that submodule later without
having to do a fetch again. This is expected to be fixed in a future Git
version.
pull
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