From 4394efecfa9f94ad14fe49bc9f499c5806aa83af Mon Sep 17 00:00:00 2001 From: Matthias Lederhofer Date: Fri, 8 Jun 2007 22:57:55 +0200 Subject: [PATCH] make git barf when an alias changes environment variables Aliases changing environment variables (GIT_DIR or GIT_WORK_TREE) can cause problems: git has to use GIT_DIR to read the aliases from the config. After running handle_options for the alias the options of the alias may have changed environment variables. Depending on the implementation of setenv the memory location obtained through getenv earlier may contain the old value or the new value (or even be used for something else?). To avoid these problems git errors out if an alias uses any option which changes environment variables. Signed-off-by: Matthias Lederhofer Signed-off-by: Junio C Hamano --- git.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/git.c b/git.c index cd3910afe..33edd6277 100644 --- a/git.c +++ b/git.c @@ -28,7 +28,7 @@ static void prepend_to_path(const char *dir, int len) free(path); } -static int handle_options(const char*** argv, int* argc) +static int handle_options(const char*** argv, int* argc, int* envchanged) { int handled = 0; @@ -64,24 +64,34 @@ static int handle_options(const char*** argv, int* argc) usage(git_usage_string); } setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; (*argv)++; (*argc)--; handled++; } else if (!prefixcmp(cmd, "--git-dir=")) { setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1); + if (envchanged) + *envchanged = 1; } else if (!strcmp(cmd, "--work-tree")) { if (*argc < 2) { fprintf(stderr, "No directory given for --work-tree.\n" ); usage(git_usage_string); } setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; (*argv)++; (*argc)--; } else if (!prefixcmp(cmd, "--work-tree=")) { setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1); + if (envchanged) + *envchanged = 1; } else if (!strcmp(cmd, "--bare")) { static char git_dir[PATH_MAX+1]; setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1); + if (envchanged) + *envchanged = 1; } else { fprintf(stderr, "Unknown option: %s\n", cmd); usage(git_usage_string); @@ -160,7 +170,7 @@ static int split_cmdline(char *cmdline, const char ***argv) static int handle_alias(int *argcp, const char ***argv) { - int nongit = 0, ret = 0, saved_errno = errno; + int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno; const char *subdir; int count, option_count; const char** new_argv; @@ -181,7 +191,11 @@ static int handle_alias(int *argcp, const char ***argv) alias_string + 1, alias_command); } count = split_cmdline(alias_string, &new_argv); - option_count = handle_options(&new_argv, &count); + option_count = handle_options(&new_argv, &count, &envchanged); + if (envchanged) + die("alias '%s' changes environment variables\n" + "You can use '!git' in the alias to do this.", + alias_command); memmove(new_argv - option_count, new_argv, count * sizeof(char *)); new_argv -= option_count; @@ -375,7 +389,7 @@ int main(int argc, const char **argv, char **envp) /* Look for flags.. */ argv++; argc--; - handle_options(&argv, &argc); + handle_options(&argv, &argc, NULL); if (argc > 0) { if (!prefixcmp(argv[0], "--")) argv[0] += 2; -- 2.26.2