fetch: use argv_array instead of hand-building arrays

Fetch invokes itself recursively when recursing into
submodules or handling "fetch --multiple". In both cases, it
builds the child's command line by pushing options onto a
statically-sized array. In both cases, the array is
currently just big enough to handle the largest possible
case. However, this technique is brittle and error-prone, so
let's replace it with a dynamic argv_array.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 1c8cb62445a3dc7a0ff1ff6d2663faec1bced167..d5442e1eb7022dc0bfe89e193d513839e5a51649 100644 (file)
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -14,6 +14,7 @@
 #include "transport.h"
 #include "submodule.h"
 #include "connected.h"
+#include "argv-array.h"
 
 static const char * const builtin_fetch_usage[] = {
        "git fetch [<options>] [<repository> [<refspec>...]]",
@@ -841,38 +842,35 @@ static int add_remote_or_group(const char *name, struct string_list *list)
        return 1;
 }
 
-static void add_options_to_argv(int *argc, const char **argv)
+static void add_options_to_argv(struct argv_array *argv)
 {
        if (dry_run)
-               argv[(*argc)++] = "--dry-run";
+               argv_array_push(argv, "--dry-run");
        if (prune)
-               argv[(*argc)++] = "--prune";
+               argv_array_push(argv, "--prune");
        if (update_head_ok)
-               argv[(*argc)++] = "--update-head-ok";
+               argv_array_push(argv, "--update-head-ok");
        if (force)
-               argv[(*argc)++] = "--force";
+               argv_array_push(argv, "--force");
        if (keep)
-               argv[(*argc)++] = "--keep";
+               argv_array_push(argv, "--keep");
        if (recurse_submodules == RECURSE_SUBMODULES_ON)
-               argv[(*argc)++] = "--recurse-submodules";
+               argv_array_push(argv, "--recurse-submodules");
        else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
-               argv[(*argc)++] = "--recurse-submodules=on-demand";
+               argv_array_push(argv, "--recurse-submodules=on-demand");
        if (verbosity >= 2)
-               argv[(*argc)++] = "-v";
+               argv_array_push(argv, "-v");
        if (verbosity >= 1)
-               argv[(*argc)++] = "-v";
+               argv_array_push(argv, "-v");
        else if (verbosity < 0)
-               argv[(*argc)++] = "-q";
+               argv_array_push(argv, "-q");
 
 }
 
 static int fetch_multiple(struct string_list *list)
 {
        int i, result = 0;
-       const char *argv[12] = { "fetch", "--append" };
-       int argc = 2;
-
-       add_options_to_argv(&argc, argv);
+       struct argv_array argv = ARGV_ARRAY_INIT;
 
        if (!append && !dry_run) {
                int errcode = truncate_fetch_head();
@@ -880,18 +878,22 @@ static int fetch_multiple(struct string_list *list)
                        return errcode;
        }
 
+       argv_array_pushl(&argv, "fetch", "--append", NULL);
+       add_options_to_argv(&argv);
+
        for (i = 0; i < list->nr; i++) {
                const char *name = list->items[i].string;
-               argv[argc] = name;
-               argv[argc + 1] = NULL;
+               argv_array_push(&argv, name);
                if (verbosity >= 0)
                        printf(_("Fetching %s\n"), name);
-               if (run_command_v_opt(argv, RUN_GIT_CMD)) {
+               if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
                        error(_("Could not fetch %s"), name);
                        result = 1;
                }
+               argv_array_pop(&argv);
        }
 
+       argv_array_clear(&argv);
        return result;
 }
 
@@ -1007,13 +1009,14 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
        }
 
        if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
-               const char *options[10];
-               int num_options = 0;
-               add_options_to_argv(&num_options, options);
-               result = fetch_populated_submodules(num_options, options,
+               struct argv_array options = ARGV_ARRAY_INIT;
+
+               add_options_to_argv(&options);
+               result = fetch_populated_submodules(options.argc, options.argv,
                                                    submodule_prefix,
                                                    recurse_submodules,
                                                    verbosity < 0);
+               argv_array_clear(&options);
        }
 
        /* All names were strdup()ed or strndup()ed */