vcs-svn: use error_errno()

diff --git a/git.c b/git.c
index c19d6bf47bdc2831c8d5c98e4921910ae1ff4db5..6cc0c077f9761f9b56e5fb7e666722b437c4fae4 100644 (file)
--- a/git.c
+++ b/git.c
@@ -25,14 +25,14 @@ 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 +41,25 @@ 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 +234,14 @@ 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 +250,7 @@ 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 +296,7 @@ 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 +311,6 @@ 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 +392,7 @@ 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 +418,8 @@ 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 +536,8 @@ 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 +581,17 @@ 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 +602,6 @@ static int run_argv(int *argcp, const char ***argv)
                 */
                if (done_alias)
                        break;
-               save_env();
                if (!handle_alias(argcp, argv))
                        break;
                done_alias = 1;