diff options
Diffstat (limited to 'git.c')
| -rw-r--r-- | git.c | 103 |
1 files changed, 39 insertions, 64 deletions
@@ -15,7 +15,6 @@ const char git_more_info_string[] = "concept guides. See 'git help <command>' or 'git help <concept>'\n" "to read about a specific subcommand or concept."); -static struct startup_info git_startup_info; static int use_pager = -1; static char *orig_cwd; static const char *env_names[] = { @@ -25,14 +24,14 @@ static const char *env_names[] = { GIT_PREFIX_ENVIRONMENT }; static char *orig_env[4]; -static int saved_environment; +static int save_restore_env_balance; -static void save_env(void) +static void save_env_before_alias(void) { int i; - if (saved_environment) - return; - saved_environment = 1; + + assert(save_restore_env_balance == 0); + save_restore_env_balance = 1; orig_cwd = xgetcwd(); for (i = 0; i < ARRAY_SIZE(env_names); i++) { orig_env[i] = getenv(env_names[i]); @@ -41,17 +40,25 @@ static void save_env(void) } } -static void restore_env(void) +static void restore_env(int external_alias) { int i; - if (orig_cwd && chdir(orig_cwd)) + + assert(save_restore_env_balance == 1); + save_restore_env_balance = 0; + if (!external_alias && orig_cwd && chdir(orig_cwd)) die_errno("could not move to %s", orig_cwd); free(orig_cwd); for (i = 0; i < ARRAY_SIZE(env_names); i++) { - if (orig_env[i]) + if (external_alias && + !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT)) + continue; + if (orig_env[i]) { setenv(env_names[i], orig_env[i], 1); - else + free(orig_env[i]); + } else { unsetenv(env_names[i]); + } } } @@ -226,14 +233,14 @@ static int handle_options(const char ***argv, int *argc, int *envchanged) static int handle_alias(int *argcp, const char ***argv) { int envchanged = 0, ret = 0, saved_errno = errno; - const char *subdir; int count, option_count; const char **new_argv; const char *alias_command; char *alias_string; int unused_nongit; - subdir = setup_git_directory_gently(&unused_nongit); + save_env_before_alias(); + setup_git_directory_gently(&unused_nongit); alias_command = (*argv)[0]; alias_string = alias_lookup(alias_command); @@ -242,6 +249,7 @@ static int handle_alias(int *argcp, const char ***argv) struct child_process child = CHILD_PROCESS_INIT; commit_pager_choice(); + restore_env(1); child.use_shell = 1; argv_array_push(&child.args, alias_string + 1); @@ -287,8 +295,7 @@ static int handle_alias(int *argcp, const char ***argv) ret = 1; } - if (subdir && chdir(subdir)) - die_errno("Cannot change to '%s'", subdir); + restore_env(0); errno = saved_errno; @@ -303,7 +310,6 @@ static int handle_alias(int *argcp, const char ***argv) * RUN_SETUP for reading from the configuration file. */ #define NEED_WORK_TREE (1<<3) -#define NO_SETUP (1<<4) struct cmd_struct { const char *cmd; @@ -385,7 +391,7 @@ static struct cmd_struct commands[] = { { "cherry", cmd_cherry, RUN_SETUP }, { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE }, { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE }, - { "clone", cmd_clone, NO_SETUP }, + { "clone", cmd_clone }, { "column", cmd_column, RUN_SETUP_GENTLY }, { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE }, { "commit-tree", cmd_commit_tree, RUN_SETUP }, @@ -411,8 +417,8 @@ static struct cmd_struct commands[] = { { "hash-object", cmd_hash_object }, { "help", cmd_help }, { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY }, - { "init", cmd_init_db, NO_SETUP }, - { "init-db", cmd_init_db, NO_SETUP }, + { "init", cmd_init_db }, + { "init-db", cmd_init_db }, { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY }, { "log", cmd_log, RUN_SETUP }, { "ls-files", cmd_ls_files, RUN_SETUP }, @@ -529,12 +535,8 @@ static void handle_builtin(int argc, const char **argv) } builtin = get_builtin(cmd); - if (builtin) { - if (saved_environment && (builtin->option & NO_SETUP)) - restore_env(); - else - exit(run_builtin(builtin, argc, argv)); - } + if (builtin) + exit(run_builtin(builtin, argc, argv)); } static void execv_dashed_external(const char **argv) @@ -578,8 +580,17 @@ static int run_argv(int *argcp, const char ***argv) int done_alias = 0; while (1) { - /* See if it's a builtin */ - handle_builtin(*argcp, *argv); + /* + * 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); @@ -590,7 +601,6 @@ static int run_argv(int *argcp, const char ***argv) */ if (done_alias) break; - save_env(); if (!handle_alias(argcp, argv)) break; done_alias = 1; @@ -599,50 +609,15 @@ static int run_argv(int *argcp, const char ***argv) 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) +int cmd_main(int argc, const char **argv) { - 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; - startup_info = &git_startup_info; - - cmd = git_extract_argv0_path(argv[0]); + cmd = 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); /* |