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pull: implement fetch + merge

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Implement the fetch + merge functionality of git-pull, by first running
git-fetch with the repo and refspecs provided on the command line, then
running git-merge on FETCH_HEAD to merge the fetched refs into the
current branch.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Paul Tan 2015-06-14 16:41:52 +08:00 committed by Junio C Hamano
parent 1e1ea69fa4
commit f2c5baa14e
1 changed files with 61 additions and 1 deletions
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62
builtin/pull.c
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@ -9,8 +9,10 @@
#include "builtin.h"
#include "parse-options.h"
#include "exec_cmd.h"
#include "run-command.h"
static const char * const pull_usage[] = {
N_("git pull [options] [<repository> [<refspec>...]]"),
NULL
};
@ -18,8 +20,61 @@ static struct option pull_options[] = {
OPT_END()
};
/**
* Parses argv into [<repo> [<refspecs>...]], returning their values in `repo`
* as a string and `refspecs` as a null-terminated array of strings. If `repo`
* is not provided in argv, it is set to NULL.
*/
static void parse_repo_refspecs(int argc, const char **argv, const char **repo,
const char ***refspecs)
{
if (argc > 0) {
*repo = *argv++;
argc--;
} else
*repo = NULL;
*refspecs = argv;
}
/**
* Runs git-fetch, returning its exit status. `repo` and `refspecs` are the
* repository and refspecs to fetch, or NULL if they are not provided.
*/
static int run_fetch(const char *repo, const char **refspecs)
{
struct argv_array args = ARGV_ARRAY_INIT;
int ret;
argv_array_pushl(&args, "fetch", "--update-head-ok", NULL);
if (repo) {
argv_array_push(&args, repo);
argv_array_pushv(&args, refspecs);
} else if (*refspecs)
die("BUG: refspecs without repo?");
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
argv_array_clear(&args);
return ret;
}
/**
* Runs git-merge, returning its exit status.
*/
static int run_merge(void)
{
int ret;
struct argv_array args = ARGV_ARRAY_INIT;
argv_array_pushl(&args, "merge", NULL);
argv_array_push(&args, "FETCH_HEAD");
ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
argv_array_clear(&args);
return ret;
}
int cmd_pull(int argc, const char **argv, const char *prefix)
{
const char *repo, **refspecs;
if (!getenv("_GIT_USE_BUILTIN_PULL")) {
const char *path = mkpath("%s/git-pull", git_exec_path());
@ -29,5 +84,10 @@ int cmd_pull(int argc, const char **argv, const char *prefix)
argc = parse_options(argc, argv, prefix, pull_options, pull_usage, 0);
return 0;
parse_repo_refspecs(argc, argv, &repo, &refspecs);
if (run_fetch(repo, refspecs))
return 1;
return run_merge();
}