/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_git_checkout_h__
#define INCLUDE_git_checkout_h__
#include "common.h"
#include "types.h"
#include "diff.h"
/**
* @file git2/checkout.h
* @brief Git checkout routines
* @defgroup git_checkout Git checkout routines
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/**
* Checkout behavior flags
*
* In libgit2, checkout is used to update the working directory and index
* to match a target tree. Unlike git checkout, it does not move the HEAD
* commit for you - use `git_repository_set_head` or the like to do that.
*
* Checkout looks at (up to) four things: the "target" tree you want to
* check out, the "baseline" tree of what was checked out previously, the
* working directory for actual files, and the index for staged changes.
*
* You give checkout one of four strategies for update:
*
* - `GIT_CHECKOUT_NONE` is a dry-run strategy that checks for conflicts,
* etc., but doesn't make any actual changes.
*
* - `GIT_CHECKOUT_FORCE` is at the opposite extreme, taking any action to
* make the working directory match the target (including potentially
* discarding modified files).
*
* In between those are `GIT_CHECKOUT_SAFE` and `GIT_CHECKOUT_SAFE_CREATE`
* both of which only make modifications that will not lose changes.
*
* | target == baseline | target != baseline |
* ---------------------|-----------------------|----------------------|
* workdir == baseline | no action | create, update, or |
* | | delete file |
* ---------------------|-----------------------|----------------------|
* workdir exists and | no action | conflict (notify |
* is != baseline | notify dirty MODIFIED | and cancel checkout) |
* ---------------------|-----------------------|----------------------|
* workdir missing, | create if SAFE_CREATE | create file |
* baseline present | notify dirty DELETED | |
* ---------------------|-----------------------|----------------------|
*
* The only difference between SAFE and SAFE_CREATE is that SAFE_CREATE
* will cause a file to be checked out if it is missing from the working
* directory even if it is not modified between the target and baseline.
*
*
* To emulate `git checkout`, use `GIT_CHECKOUT_SAFE` with a checkout
* notification callback (see below) that displays information about dirty
* files. The default behavior will cancel checkout on conflicts.
*
* To emulate `git checkout-index`, use `GIT_CHECKOUT_SAFE_CREATE` with a
* notification callback that cancels the operation if a dirty-but-existing
* file is found in the working directory. This core git command isn't
* quite "force" but is sensitive about some types of changes.
*
* To emulate `git checkout -f`, use `GIT_CHECKOUT_FORCE`.
*
* To emulate `git clone` use `GIT_CHECKOUT_SAFE_CREATE` in the options.
*
*
* There are some additional flags to modified the behavior of checkout:
*
* - GIT_CHECKOUT_ALLOW_CONFLICTS makes SAFE mode apply safe file updates
* even if there are conflicts (instead of cancelling the checkout).
*
* - GIT_CHECKOUT_REMOVE_UNTRACKED means remove untracked files (i.e. not
* in target, baseline, or index, and not ignored) from the working dir.
*
* - GIT_CHECKOUT_REMOVE_IGNORED means remove ignored files (that are also
* untracked) from the working directory as well.
*
* - GIT_CHECKOUT_UPDATE_ONLY means to only update the content of files that
* already exist. Files will not be created nor deleted. This just skips
* applying adds, deletes, and typechanges.
*
* - GIT_CHECKOUT_DONT_UPDATE_INDEX prevents checkout from writing the
* updated files' information to the index.
*
* - Normally, checkout will reload the index and git attributes from disk
* before any operations. GIT_CHECKOUT_NO_REFRESH prevents this reload.
*
* - Unmerged index entries are conflicts. GIT_CHECKOUT_SKIP_UNMERGED skips
* files with unmerged index entries instead. GIT_CHECKOUT_USE_OURS and
* GIT_CHECKOUT_USE_THEIRS to proceed with the checkout using either the
* stage 2 ("ours") or stage 3 ("theirs") version of files in the index.
*/
typedef enum {
GIT_CHECKOUT_NONE = 0, /** default is a dry run, no actual updates */
/** Allow safe updates that cannot overwrite uncommitted data */
GIT_CHECKOUT_SAFE = (1u << 0),
/** Allow safe updates plus creation of missing files */
GIT_CHECKOUT_SAFE_CREATE = (1u << 1),
/** Allow all updates to force working directory to look like index */
GIT_CHECKOUT_FORCE = (1u << 2),
/** Allow checkout to make safe updates even if conflicts are found */
GIT_CHECKOUT_ALLOW_CONFLICTS = (1u << 4),
/** Remove untracked files not in index (that are not ignored) */
GIT_CHECKOUT_REMOVE_UNTRACKED = (1u << 5),
/** Remove ignored files not in index */
GIT_CHECKOUT_REMOVE_IGNORED = (1u << 6),
/** Only update existing files, don't create new ones */
GIT_CHECKOUT_UPDATE_ONLY = (1u << 7),
/** Normally checkout updates index entries as it goes; this stops that */
GIT_CHECKOUT_DONT_UPDATE_INDEX = (1u << 8),
/** Don't refresh index/config/etc before doing checkout */
GIT_CHECKOUT_NO_REFRESH = (1u << 9),
/**
* THE FOLLOWING OPTIONS ARE NOT YET IMPLEMENTED
*/
/** Allow checkout to skip unmerged files (NOT IMPLEMENTED) */
GIT_CHECKOUT_SKIP_UNMERGED = (1u << 10),
/** For unmerged files, checkout stage 2 from index (NOT IMPLEMENTED) */
GIT_CHECKOUT_USE_OURS = (1u << 11),
/** For unmerged files, checkout stage 3 from index (NOT IMPLEMENTED) */
GIT_CHECKOUT_USE_THEIRS = (1u << 12),
/** Recursively checkout submodules with same options (NOT IMPLEMENTED) */
GIT_CHECKOUT_UPDATE_SUBMODULES = (1u << 16),
/** Recursively checkout submodules if HEAD moved in super repo (NOT IMPLEMENTED) */
GIT_CHECKOUT_UPDATE_SUBMODULES_IF_CHANGED = (1u << 17),
} git_checkout_strategy_t;
/**
* Checkout notification flags
*
* Checkout will invoke an options notification callback (`notify_cb`) for
* certain cases - you pick which ones via `notify_flags`:
*
* - GIT_CHECKOUT_NOTIFY_CONFLICT invokes checkout on conflicting paths.
*
* - GIT_CHECKOUT_NOTIFY_DIRTY notifies about "dirty" files, i.e. those that
* do not need an update but no longer match the baseline. Core git
* displays these files when checkout runs, but won't stop the checkout.
*
* - GIT_CHECKOUT_NOTIFY_UPDATED sends notification for any file changed.
*
* - GIT_CHECKOUT_NOTIFY_UNTRACKED notifies about untracked files.
*
* - GIT_CHECKOUT_NOTIFY_IGNORED notifies about ignored files.
*
* Returning a non-zero value from this callback will cancel the checkout.
* Notification callbacks are made prior to modifying any files on disk.
*/
typedef enum {
GIT_CHECKOUT_NOTIFY_NONE = 0,
GIT_CHECKOUT_NOTIFY_CONFLICT = (1u << 0),
GIT_CHECKOUT_NOTIFY_DIRTY = (1u << 1),
GIT_CHECKOUT_NOTIFY_UPDATED = (1u << 2),
GIT_CHECKOUT_NOTIFY_UNTRACKED = (1u << 3),
GIT_CHECKOUT_NOTIFY_IGNORED = (1u << 4),
} git_checkout_notify_t;
/** Checkout notification callback function */
typedef int (*git_checkout_notify_cb)(
git_checkout_notify_t why,
const char *path,
const git_diff_file *baseline,
const git_diff_file *target,
const git_diff_file *workdir,
void *payload);
/** Checkout progress notification function */
typedef void (*git_checkout_progress_cb)(
const char *path,
size_t completed_steps,
size_t total_steps,
void *payload);
/**
* Checkout options structure
*
* Zero out for defaults. Initialize with `GIT_CHECKOUT_OPTS_INIT` macro to
* correctly set the `version` field. E.g.
*
* git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
*/
typedef struct git_checkout_opts {
unsigned int version;
unsigned int checkout_strategy; /** default will be a dry run */
int disable_filters; /** don't apply filters like CRLF conversion */
unsigned int dir_mode; /** default is 0755 */
unsigned int file_mode; /** default is 0644 or 0755 as dictated by blob */
int file_open_flags; /** default is O_CREAT | O_TRUNC | O_WRONLY */
unsigned int notify_flags; /** see `git_checkout_notify_t` above */
git_checkout_notify_cb notify_cb;
void *notify_payload;
/* Optional callback to notify the consumer of checkout progress. */
git_checkout_progress_cb progress_cb;
void *progress_payload;
/** When not zeroed out, array of fnmatch patterns specifying which
* paths should be taken into account, otherwise all files.
*/
git_strarray paths;
git_tree *baseline; /** expected content of workdir, defaults to HEAD */
} git_checkout_opts;
#define GIT_CHECKOUT_OPTS_VERSION 1
#define GIT_CHECKOUT_OPTS_INIT {GIT_CHECKOUT_OPTS_VERSION}
/**
* Updates files in the index and the working tree to match the content of
* the commit pointed at by HEAD.
*
* @param repo repository to check out (must be non-bare)
* @param opts specifies checkout options (may be NULL)
* @return 0 on success, GIT_EORPHANEDHEAD when HEAD points to a non existing
* branch, GIT_ERROR otherwise (use giterr_last for information
* about the error)
*/
GIT_EXTERN(int) git_checkout_head(
git_repository *repo,
git_checkout_opts *opts);
/**
* Updates files in the working tree to match the content of the index.
*
* @param repo repository into which to check out (must be non-bare)
* @param index index to be checked out (or NULL to use repository index)
* @param opts specifies checkout options (may be NULL)
* @return 0 on success, GIT_ERROR otherwise (use giterr_last for information
* about the error)
*/
GIT_EXTERN(int) git_checkout_index(
git_repository *repo,
git_index *index,
git_checkout_opts *opts);
/**
* Updates files in the index and working tree to match the content of the
* tree pointed at by the treeish.
*
* @param repo repository to check out (must be non-bare)
* @param treeish a commit, tag or tree which content will be used to update
* the working directory
* @param opts specifies checkout options (may be NULL)
* @return 0 on success, GIT_ERROR otherwise (use giterr_last for information
* about the error)
*/
GIT_EXTERN(int) git_checkout_tree(
git_repository *repo,
const git_object *treeish,
git_checkout_opts *opts);
/** @} */
GIT_END_DECL
#endif
