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![Jeff King](/assets/img/avatar_default.png)
Commit a60645f
(setup: remember whether repository was
found, 2010-08-05) introduced the startup_info structure,
which records some parts of the setup_git_directory()
process (notably, whether we actually found a repository or
not).
One of the uses of this data is for functions to behave
appropriately based on whether we are in a repo. But the
startup_info struct is just a pointer to storage provided by
the main program, and the only program that sets it up is
the git.c wrapper. Thus builtins have access to
startup_info, but externally linked programs do not.
Worse, library code which is accessible from both has to be
careful about accessing startup_info. This can be used to
trigger a die("BUG") via get_sha1():
$ git fast-import <<-\EOF
tag foo
from HEAD:./whatever
EOF
fatal: BUG: startup_info struct is not initialized.
Obviously that's fairly nonsensical input to feed to
fast-import, but we should never hit a die("BUG"). And there
may be other ways to trigger it if other non-builtins
resolve sha1s.
So let's point the storage for startup_info to a static
variable in setup.c, making it available to all users of the
library code. We _could_ turn startup_info into a regular
extern struct, but doing so would mean tweaking all of the
existing use sites. So let's leave the pointer indirection
in place. We can, however, drop any checks for NULL, as
they will always be false (and likewise, we can drop the
test covering this case, which was a rather artificial
situation using one of the test-* programs).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
719 lines
20 KiB
C
719 lines
20 KiB
C
#include "builtin.h"
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#include "exec_cmd.h"
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#include "help.h"
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#include "run-command.h"
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const char git_usage_string[] =
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"git [--version] [--help] [-C <path>] [-c name=value]\n"
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" [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
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" [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]\n"
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" [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
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" <command> [<args>]";
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const char git_more_info_string[] =
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N_("'git help -a' and 'git help -g' list available subcommands and some\n"
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"concept guides. See 'git help <command>' or 'git help <concept>'\n"
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"to read about a specific subcommand or concept.");
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static int use_pager = -1;
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static char *orig_cwd;
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static const char *env_names[] = {
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GIT_DIR_ENVIRONMENT,
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GIT_WORK_TREE_ENVIRONMENT,
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GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
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GIT_PREFIX_ENVIRONMENT
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};
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static char *orig_env[4];
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static int save_restore_env_balance;
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static void save_env_before_alias(void)
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{
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int i;
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assert(save_restore_env_balance == 0);
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save_restore_env_balance = 1;
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orig_cwd = xgetcwd();
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for (i = 0; i < ARRAY_SIZE(env_names); i++) {
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orig_env[i] = getenv(env_names[i]);
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if (orig_env[i])
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orig_env[i] = xstrdup(orig_env[i]);
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}
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}
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static void restore_env(int external_alias)
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{
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int i;
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assert(save_restore_env_balance == 1);
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save_restore_env_balance = 0;
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if (!external_alias && orig_cwd && chdir(orig_cwd))
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die_errno("could not move to %s", orig_cwd);
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free(orig_cwd);
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for (i = 0; i < ARRAY_SIZE(env_names); i++) {
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if (external_alias &&
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!strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
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continue;
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if (orig_env[i]) {
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setenv(env_names[i], orig_env[i], 1);
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free(orig_env[i]);
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} else {
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unsetenv(env_names[i]);
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}
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}
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}
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static void commit_pager_choice(void) {
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switch (use_pager) {
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case 0:
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setenv("GIT_PAGER", "cat", 1);
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break;
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case 1:
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setup_pager();
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break;
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default:
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break;
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}
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}
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static int handle_options(const char ***argv, int *argc, int *envchanged)
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{
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const char **orig_argv = *argv;
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while (*argc > 0) {
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const char *cmd = (*argv)[0];
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if (cmd[0] != '-')
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break;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
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break;
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/*
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* Check remaining flags.
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*/
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if (skip_prefix(cmd, "--exec-path", &cmd)) {
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if (*cmd == '=')
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git_set_argv_exec_path(cmd + 1);
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else {
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puts(git_exec_path());
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exit(0);
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}
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} else if (!strcmp(cmd, "--html-path")) {
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puts(system_path(GIT_HTML_PATH));
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exit(0);
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} else if (!strcmp(cmd, "--man-path")) {
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puts(system_path(GIT_MAN_PATH));
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exit(0);
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} else if (!strcmp(cmd, "--info-path")) {
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puts(system_path(GIT_INFO_PATH));
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exit(0);
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} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
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use_pager = 1;
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} else if (!strcmp(cmd, "--no-pager")) {
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use_pager = 0;
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--no-replace-objects")) {
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check_replace_refs = 0;
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setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--git-dir")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for --git-dir.\n" );
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usage(git_usage_string);
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}
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setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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} else if (skip_prefix(cmd, "--git-dir=", &cmd)) {
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setenv(GIT_DIR_ENVIRONMENT, cmd, 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--namespace")) {
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if (*argc < 2) {
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fprintf(stderr, "No namespace given for --namespace.\n" );
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usage(git_usage_string);
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}
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setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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} else if (skip_prefix(cmd, "--namespace=", &cmd)) {
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setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--work-tree")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for --work-tree.\n" );
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usage(git_usage_string);
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}
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setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
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if (envchanged)
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*envchanged = 1;
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(*argv)++;
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(*argc)--;
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} else if (skip_prefix(cmd, "--work-tree=", &cmd)) {
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setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--bare")) {
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char *cwd = xgetcwd();
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is_bare_repository_cfg = 1;
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setenv(GIT_DIR_ENVIRONMENT, cwd, 0);
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free(cwd);
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setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "-c")) {
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if (*argc < 2) {
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fprintf(stderr, "-c expects a configuration string\n" );
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usage(git_usage_string);
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}
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git_config_push_parameter((*argv)[1]);
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(*argv)++;
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(*argc)--;
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} else if (!strcmp(cmd, "--literal-pathspecs")) {
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setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--no-literal-pathspecs")) {
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setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--glob-pathspecs")) {
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setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--noglob-pathspecs")) {
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setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--icase-pathspecs")) {
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setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "--shallow-file")) {
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(*argv)++;
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(*argc)--;
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set_alternate_shallow_file((*argv)[0], 1);
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if (envchanged)
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*envchanged = 1;
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} else if (!strcmp(cmd, "-C")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for -C.\n" );
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usage(git_usage_string);
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}
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if ((*argv)[1][0]) {
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if (chdir((*argv)[1]))
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die_errno("Cannot change to '%s'", (*argv)[1]);
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if (envchanged)
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*envchanged = 1;
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}
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(*argv)++;
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(*argc)--;
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} else {
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fprintf(stderr, "Unknown option: %s\n", cmd);
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usage(git_usage_string);
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}
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(*argv)++;
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(*argc)--;
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}
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return (*argv) - orig_argv;
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}
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static int handle_alias(int *argcp, const char ***argv)
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{
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int envchanged = 0, ret = 0, saved_errno = errno;
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int count, option_count;
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const char **new_argv;
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const char *alias_command;
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char *alias_string;
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int unused_nongit;
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save_env_before_alias();
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setup_git_directory_gently(&unused_nongit);
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alias_command = (*argv)[0];
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alias_string = alias_lookup(alias_command);
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if (alias_string) {
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if (alias_string[0] == '!') {
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struct child_process child = CHILD_PROCESS_INIT;
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commit_pager_choice();
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restore_env(1);
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child.use_shell = 1;
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argv_array_push(&child.args, alias_string + 1);
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argv_array_pushv(&child.args, (*argv) + 1);
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ret = run_command(&child);
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if (ret >= 0) /* normal exit */
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exit(ret);
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die_errno("While expanding alias '%s': '%s'",
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alias_command, alias_string + 1);
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}
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count = split_cmdline(alias_string, &new_argv);
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if (count < 0)
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die("Bad alias.%s string: %s", alias_command,
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split_cmdline_strerror(count));
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option_count = handle_options(&new_argv, &count, &envchanged);
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if (envchanged)
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die("alias '%s' changes environment variables\n"
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"You can use '!git' in the alias to do this.",
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alias_command);
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memmove(new_argv - option_count, new_argv,
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count * sizeof(char *));
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new_argv -= option_count;
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if (count < 1)
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die("empty alias for %s", alias_command);
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if (!strcmp(alias_command, new_argv[0]))
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die("recursive alias: %s", alias_command);
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trace_argv_printf(new_argv,
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"trace: alias expansion: %s =>",
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alias_command);
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REALLOC_ARRAY(new_argv, count + *argcp);
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/* insert after command name */
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memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
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*argv = new_argv;
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*argcp += count - 1;
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ret = 1;
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}
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restore_env(0);
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errno = saved_errno;
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return ret;
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}
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#define RUN_SETUP (1<<0)
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#define RUN_SETUP_GENTLY (1<<1)
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#define USE_PAGER (1<<2)
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/*
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* require working tree to be present -- anything uses this needs
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* RUN_SETUP for reading from the configuration file.
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*/
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#define NEED_WORK_TREE (1<<3)
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struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **, const char *);
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int option;
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};
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static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
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{
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int status, help;
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struct stat st;
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const char *prefix;
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prefix = NULL;
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help = argc == 2 && !strcmp(argv[1], "-h");
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if (!help) {
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if (p->option & RUN_SETUP)
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prefix = setup_git_directory();
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else if (p->option & RUN_SETUP_GENTLY) {
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int nongit_ok;
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prefix = setup_git_directory_gently(&nongit_ok);
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}
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if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
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use_pager = check_pager_config(p->cmd);
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if (use_pager == -1 && p->option & USE_PAGER)
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use_pager = 1;
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if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
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startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
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trace_repo_setup(prefix);
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}
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commit_pager_choice();
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if (!help && p->option & NEED_WORK_TREE)
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setup_work_tree();
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trace_argv_printf(argv, "trace: built-in: git");
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status = p->fn(argc, argv, prefix);
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if (status)
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return status;
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/* Somebody closed stdout? */
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if (fstat(fileno(stdout), &st))
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return 0;
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/* Ignore write errors for pipes and sockets.. */
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if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
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return 0;
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/* Check for ENOSPC and EIO errors.. */
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if (fflush(stdout))
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die_errno("write failure on standard output");
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if (ferror(stdout))
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die("unknown write failure on standard output");
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if (fclose(stdout))
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die_errno("close failed on standard output");
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return 0;
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}
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static struct cmd_struct commands[] = {
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{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
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{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
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{ "annotate", cmd_annotate, RUN_SETUP },
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{ "apply", cmd_apply, RUN_SETUP_GENTLY },
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{ "archive", cmd_archive },
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{ "bisect--helper", cmd_bisect__helper, RUN_SETUP },
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{ "blame", cmd_blame, RUN_SETUP },
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{ "branch", cmd_branch, RUN_SETUP },
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{ "bundle", cmd_bundle, RUN_SETUP_GENTLY },
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{ "cat-file", cmd_cat_file, RUN_SETUP },
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{ "check-attr", cmd_check_attr, RUN_SETUP },
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{ "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE },
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{ "check-mailmap", cmd_check_mailmap, RUN_SETUP },
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{ "check-ref-format", cmd_check_ref_format },
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{ "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
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{ "checkout-index", cmd_checkout_index,
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RUN_SETUP | NEED_WORK_TREE},
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{ "cherry", cmd_cherry, RUN_SETUP },
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{ "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
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{ "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
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{ "clone", cmd_clone },
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{ "column", cmd_column, RUN_SETUP_GENTLY },
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{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
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{ "commit-tree", cmd_commit_tree, RUN_SETUP },
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{ "config", cmd_config, RUN_SETUP_GENTLY },
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{ "count-objects", cmd_count_objects, RUN_SETUP },
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{ "credential", cmd_credential, RUN_SETUP_GENTLY },
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{ "describe", cmd_describe, RUN_SETUP },
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{ "diff", cmd_diff },
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{ "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
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{ "diff-index", cmd_diff_index, RUN_SETUP },
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{ "diff-tree", cmd_diff_tree, RUN_SETUP },
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{ "fast-export", cmd_fast_export, RUN_SETUP },
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{ "fetch", cmd_fetch, RUN_SETUP },
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{ "fetch-pack", cmd_fetch_pack, RUN_SETUP },
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{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
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{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
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{ "format-patch", cmd_format_patch, RUN_SETUP },
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{ "fsck", cmd_fsck, RUN_SETUP },
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{ "fsck-objects", cmd_fsck, RUN_SETUP },
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{ "gc", cmd_gc, RUN_SETUP },
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{ "get-tar-commit-id", cmd_get_tar_commit_id },
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{ "grep", cmd_grep, RUN_SETUP_GENTLY },
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{ "hash-object", cmd_hash_object },
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{ "help", cmd_help },
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|
{ "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
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{ "init", cmd_init_db },
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{ "init-db", cmd_init_db },
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{ "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
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{ "log", cmd_log, RUN_SETUP },
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{ "ls-files", cmd_ls_files, RUN_SETUP },
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|
{ "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
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{ "ls-tree", cmd_ls_tree, RUN_SETUP },
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|
{ "mailinfo", cmd_mailinfo },
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|
{ "mailsplit", cmd_mailsplit },
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|
{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "merge-base", cmd_merge_base, RUN_SETUP },
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|
{ "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
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|
{ "merge-index", cmd_merge_index, RUN_SETUP },
|
|
{ "merge-ours", cmd_merge_ours, RUN_SETUP },
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|
{ "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
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|
{ "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "merge-tree", cmd_merge_tree, RUN_SETUP },
|
|
{ "mktag", cmd_mktag, RUN_SETUP },
|
|
{ "mktree", cmd_mktree, RUN_SETUP },
|
|
{ "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "name-rev", cmd_name_rev, RUN_SETUP },
|
|
{ "notes", cmd_notes, RUN_SETUP },
|
|
{ "pack-objects", cmd_pack_objects, RUN_SETUP },
|
|
{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },
|
|
{ "pack-refs", cmd_pack_refs, RUN_SETUP },
|
|
{ "patch-id", cmd_patch_id },
|
|
{ "pickaxe", cmd_blame, RUN_SETUP },
|
|
{ "prune", cmd_prune, RUN_SETUP },
|
|
{ "prune-packed", cmd_prune_packed, RUN_SETUP },
|
|
{ "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "push", cmd_push, RUN_SETUP },
|
|
{ "read-tree", cmd_read_tree, RUN_SETUP },
|
|
{ "receive-pack", cmd_receive_pack },
|
|
{ "reflog", cmd_reflog, RUN_SETUP },
|
|
{ "remote", cmd_remote, RUN_SETUP },
|
|
{ "remote-ext", cmd_remote_ext },
|
|
{ "remote-fd", cmd_remote_fd },
|
|
{ "repack", cmd_repack, RUN_SETUP },
|
|
{ "replace", cmd_replace, RUN_SETUP },
|
|
{ "rerere", cmd_rerere, RUN_SETUP },
|
|
{ "reset", cmd_reset, RUN_SETUP },
|
|
{ "rev-list", cmd_rev_list, RUN_SETUP },
|
|
{ "rev-parse", cmd_rev_parse },
|
|
{ "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "rm", cmd_rm, RUN_SETUP },
|
|
{ "send-pack", cmd_send_pack, RUN_SETUP },
|
|
{ "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
|
|
{ "show", cmd_show, RUN_SETUP },
|
|
{ "show-branch", cmd_show_branch, RUN_SETUP },
|
|
{ "show-ref", cmd_show_ref, RUN_SETUP },
|
|
{ "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
|
|
{ "stripspace", cmd_stripspace },
|
|
{ "submodule--helper", cmd_submodule__helper, RUN_SETUP },
|
|
{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
|
|
{ "tag", cmd_tag, RUN_SETUP },
|
|
{ "unpack-file", cmd_unpack_file, RUN_SETUP },
|
|
{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
|
|
{ "update-index", cmd_update_index, RUN_SETUP },
|
|
{ "update-ref", cmd_update_ref, RUN_SETUP },
|
|
{ "update-server-info", cmd_update_server_info, RUN_SETUP },
|
|
{ "upload-archive", cmd_upload_archive },
|
|
{ "upload-archive--writer", cmd_upload_archive_writer },
|
|
{ "var", cmd_var, RUN_SETUP_GENTLY },
|
|
{ "verify-commit", cmd_verify_commit, RUN_SETUP },
|
|
{ "verify-pack", cmd_verify_pack },
|
|
{ "verify-tag", cmd_verify_tag, RUN_SETUP },
|
|
{ "version", cmd_version },
|
|
{ "whatchanged", cmd_whatchanged, RUN_SETUP },
|
|
{ "worktree", cmd_worktree, RUN_SETUP },
|
|
{ "write-tree", cmd_write_tree, RUN_SETUP },
|
|
};
|
|
|
|
static struct cmd_struct *get_builtin(const char *s)
|
|
{
|
|
int i;
|
|
for (i = 0; i < ARRAY_SIZE(commands); i++) {
|
|
struct cmd_struct *p = commands + i;
|
|
if (!strcmp(s, p->cmd))
|
|
return p;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int is_builtin(const char *s)
|
|
{
|
|
return !!get_builtin(s);
|
|
}
|
|
|
|
#ifdef STRIP_EXTENSION
|
|
static void strip_extension(const char **argv)
|
|
{
|
|
size_t len;
|
|
|
|
if (strip_suffix(argv[0], STRIP_EXTENSION, &len))
|
|
argv[0] = xmemdupz(argv[0], len);
|
|
}
|
|
#else
|
|
#define strip_extension(cmd)
|
|
#endif
|
|
|
|
static void handle_builtin(int argc, const char **argv)
|
|
{
|
|
const char *cmd;
|
|
struct cmd_struct *builtin;
|
|
|
|
strip_extension(argv);
|
|
cmd = argv[0];
|
|
|
|
/* Turn "git cmd --help" into "git help cmd" */
|
|
if (argc > 1 && !strcmp(argv[1], "--help")) {
|
|
argv[1] = argv[0];
|
|
argv[0] = cmd = "help";
|
|
}
|
|
|
|
builtin = get_builtin(cmd);
|
|
if (builtin)
|
|
exit(run_builtin(builtin, argc, argv));
|
|
}
|
|
|
|
static void execv_dashed_external(const char **argv)
|
|
{
|
|
struct strbuf cmd = STRBUF_INIT;
|
|
const char *tmp;
|
|
int status;
|
|
|
|
if (use_pager == -1)
|
|
use_pager = check_pager_config(argv[0]);
|
|
commit_pager_choice();
|
|
|
|
strbuf_addf(&cmd, "git-%s", argv[0]);
|
|
|
|
/*
|
|
* argv[0] must be the git command, but the argv array
|
|
* belongs to the caller, and may be reused in
|
|
* subsequent loop iterations. Save argv[0] and
|
|
* restore it on error.
|
|
*/
|
|
tmp = argv[0];
|
|
argv[0] = cmd.buf;
|
|
|
|
trace_argv_printf(argv, "trace: exec:");
|
|
|
|
/*
|
|
* if we fail because the command is not found, it is
|
|
* OK to return. Otherwise, we just pass along the status code.
|
|
*/
|
|
status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
|
|
if (status >= 0 || errno != ENOENT)
|
|
exit(status);
|
|
|
|
argv[0] = tmp;
|
|
|
|
strbuf_release(&cmd);
|
|
}
|
|
|
|
static int run_argv(int *argcp, const char ***argv)
|
|
{
|
|
int done_alias = 0;
|
|
|
|
while (1) {
|
|
/*
|
|
* If we tried alias and futzed with our environment,
|
|
* it no longer is safe to invoke builtins directly in
|
|
* general. We have to spawn them as dashed externals.
|
|
*
|
|
* NEEDSWORK: if we can figure out cases
|
|
* where it is safe to do, we can avoid spawning a new
|
|
* process.
|
|
*/
|
|
if (!done_alias)
|
|
handle_builtin(*argcp, *argv);
|
|
|
|
/* .. then try the external ones */
|
|
execv_dashed_external(*argv);
|
|
|
|
/* It could be an alias -- this works around the insanity
|
|
* of overriding "git log" with "git show" by having
|
|
* alias.log = show
|
|
*/
|
|
if (done_alias)
|
|
break;
|
|
if (!handle_alias(argcp, argv))
|
|
break;
|
|
done_alias = 1;
|
|
}
|
|
|
|
return done_alias;
|
|
}
|
|
|
|
/*
|
|
* Many parts of Git have subprograms communicate via pipe, expect the
|
|
* upstream of a pipe to die with SIGPIPE when the downstream of a
|
|
* pipe does not need to read all that is written. Some third-party
|
|
* programs that ignore or block SIGPIPE for their own reason forget
|
|
* to restore SIGPIPE handling to the default before spawning Git and
|
|
* break this carefully orchestrated machinery.
|
|
*
|
|
* Restore the way SIGPIPE is handled to default, which is what we
|
|
* expect.
|
|
*/
|
|
static void restore_sigpipe_to_default(void)
|
|
{
|
|
sigset_t unblock;
|
|
|
|
sigemptyset(&unblock);
|
|
sigaddset(&unblock, SIGPIPE);
|
|
sigprocmask(SIG_UNBLOCK, &unblock, NULL);
|
|
signal(SIGPIPE, SIG_DFL);
|
|
}
|
|
|
|
int main(int argc, char **av)
|
|
{
|
|
const char **argv = (const char **) av;
|
|
const char *cmd;
|
|
int done_help = 0;
|
|
|
|
cmd = git_extract_argv0_path(argv[0]);
|
|
if (!cmd)
|
|
cmd = "git-help";
|
|
|
|
/*
|
|
* Always open file descriptors 0/1/2 to avoid clobbering files
|
|
* in die(). It also avoids messing up when the pipes are dup'ed
|
|
* onto stdin/stdout/stderr in the child processes we spawn.
|
|
*/
|
|
sanitize_stdfds();
|
|
|
|
restore_sigpipe_to_default();
|
|
|
|
git_setup_gettext();
|
|
|
|
trace_command_performance(argv);
|
|
|
|
/*
|
|
* "git-xxxx" is the same as "git xxxx", but we obviously:
|
|
*
|
|
* - cannot take flags in between the "git" and the "xxxx".
|
|
* - cannot execute it externally (since it would just do
|
|
* the same thing over again)
|
|
*
|
|
* So we just directly call the builtin handler, and die if
|
|
* that one cannot handle it.
|
|
*/
|
|
if (skip_prefix(cmd, "git-", &cmd)) {
|
|
argv[0] = cmd;
|
|
handle_builtin(argc, argv);
|
|
die("cannot handle %s as a builtin", cmd);
|
|
}
|
|
|
|
/* Look for flags.. */
|
|
argv++;
|
|
argc--;
|
|
handle_options(&argv, &argc, NULL);
|
|
if (argc > 0) {
|
|
/* translate --help and --version into commands */
|
|
skip_prefix(argv[0], "--", &argv[0]);
|
|
} else {
|
|
/* The user didn't specify a command; give them help */
|
|
commit_pager_choice();
|
|
printf("usage: %s\n\n", git_usage_string);
|
|
list_common_cmds_help();
|
|
printf("\n%s\n", _(git_more_info_string));
|
|
exit(1);
|
|
}
|
|
cmd = argv[0];
|
|
|
|
/*
|
|
* We use PATH to find git commands, but we prepend some higher
|
|
* precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
|
|
* environment, and the $(gitexecdir) from the Makefile at build
|
|
* time.
|
|
*/
|
|
setup_path();
|
|
|
|
while (1) {
|
|
int was_alias = run_argv(&argc, &argv);
|
|
if (errno != ENOENT)
|
|
break;
|
|
if (was_alias) {
|
|
fprintf(stderr, "Expansion of alias '%s' failed; "
|
|
"'%s' is not a git command\n",
|
|
cmd, argv[0]);
|
|
exit(1);
|
|
}
|
|
if (!done_help) {
|
|
cmd = argv[0] = help_unknown_cmd(cmd);
|
|
done_help = 1;
|
|
} else
|
|
break;
|
|
}
|
|
|
|
fprintf(stderr, "Failed to run command '%s': %s\n",
|
|
cmd, strerror(errno));
|
|
|
|
return 1;
|
|
}
|