builtin/pull.c

   1 /*
   2  * Builtin "git pull"
   3  *
   4  * Based on git-pull.sh by Junio C Hamano
   5  *
   6  * Fetch one or more remote refs and merge it/them into the current HEAD.
   7  */
   8 #include "cache.h"
   9 #include "builtin.h"
  10 #include "parse-options.h"
  11 #include "exec_cmd.h"
  12 #include "run-command.h"
  13
  14 static const char * const pull_usage[] = {
  15         N_("git pull [options] [<repository> [<refspec>...]]"),
  16         NULL
  17 };
  18
  19 /* Shared options */
  20 static int opt_verbosity;
  21 static char *opt_progress;
  22
  23 static struct option pull_options[] = {
  24         /* Shared options */
  25         OPT__VERBOSITY(&opt_verbosity),
  26         OPT_PASSTHRU(0, "progress", &opt_progress, NULL,
  27                 N_("force progress reporting"),
  28                 PARSE_OPT_NOARG),
  29
  30         OPT_END()
  31 };
  32
  33 /**
  34  * Pushes "-q" or "-v" switches into arr to match the opt_verbosity level.
  35  */
  36 static void argv_push_verbosity(struct argv_array *arr)
  37 {
  38         int verbosity;
  39
  40         for (verbosity = opt_verbosity; verbosity > 0; verbosity--)
  41                 argv_array_push(arr, "-v");
  42
  43         for (verbosity = opt_verbosity; verbosity < 0; verbosity++)
  44                 argv_array_push(arr, "-q");
  45 }
  46
  47 /**
  48  * Parses argv into [<repo> [<refspecs>...]], returning their values in `repo`
  49  * as a string and `refspecs` as a null-terminated array of strings. If `repo`
  50  * is not provided in argv, it is set to NULL.
  51  */
  52 static void parse_repo_refspecs(int argc, const char **argv, const char **repo,
  53                 const char ***refspecs)
  54 {
  55         if (argc > 0) {
  56                 *repo = *argv++;
  57                 argc--;
  58         } else
  59                 *repo = NULL;
  60         *refspecs = argv;
  61 }
  62
  63 /**
  64  * Runs git-fetch, returning its exit status. `repo` and `refspecs` are the
  65  * repository and refspecs to fetch, or NULL if they are not provided.
  66  */
  67 static int run_fetch(const char *repo, const char **refspecs)
  68 {
  69         struct argv_array args = ARGV_ARRAY_INIT;
  70         int ret;
  71
  72         argv_array_pushl(&args, "fetch", "--update-head-ok", NULL);
  73
  74         /* Shared options */
  75         argv_push_verbosity(&args);
  76         if (opt_progress)
  77                 argv_array_push(&args, opt_progress);
  78
  79         if (repo) {
  80                 argv_array_push(&args, repo);
  81                 argv_array_pushv(&args, refspecs);
  82         } else if (*refspecs)
  83                 die("BUG: refspecs without repo?");
  84         ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
  85         argv_array_clear(&args);
  86         return ret;
  87 }
  88
  89 /**
  90  * Runs git-merge, returning its exit status.
  91  */
  92 static int run_merge(void)
  93 {
  94         int ret;
  95         struct argv_array args = ARGV_ARRAY_INIT;
  96
  97         argv_array_pushl(&args, "merge", NULL);
  98
  99         /* Shared options */
 100         argv_push_verbosity(&args);
 101         if (opt_progress)
 102                 argv_array_push(&args, opt_progress);
 103
 104         argv_array_push(&args, "FETCH_HEAD");
 105         ret = run_command_v_opt(args.argv, RUN_GIT_CMD);
 106         argv_array_clear(&args);
 107         return ret;
 108 }
 109
 110 int cmd_pull(int argc, const char **argv, const char *prefix)
 111 {
 112         const char *repo, **refspecs;
 113
 114         if (!getenv("_GIT_USE_BUILTIN_PULL")) {
 115                 const char *path = mkpath("%s/git-pull", git_exec_path());
 116
 117                 if (sane_execvp(path, (char **)argv) < 0)
 118                         die_errno("could not exec %s", path);
 119         }
 120
 121         argc = parse_options(argc, argv, prefix, pull_options, pull_usage, 0);
 122
 123         parse_repo_refspecs(argc, argv, &repo, &refspecs);
 124
 125         if (run_fetch(repo, refspecs))
 126                 return 1;
 127
 128         return run_merge();
 129 }