| #include "cache.h" |
| #include "exec_cmd.h" |
| #include "quote.h" |
| #define MAX_ARGS 32 |
| |
| static const char *argv_exec_path; |
| static const char *argv0_path; |
| |
| const char *system_path(const char *path) |
| { |
| #ifdef RUNTIME_PREFIX |
| static const char *prefix; |
| #else |
| static const char *prefix = PREFIX; |
| #endif |
| struct strbuf d = STRBUF_INIT; |
| |
| if (is_absolute_path(path)) |
| return path; |
| |
| #ifdef RUNTIME_PREFIX |
| assert(argv0_path); |
| assert(is_absolute_path(argv0_path)); |
| |
| if (!prefix && |
| !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) && |
| !(prefix = strip_path_suffix(argv0_path, BINDIR)) && |
| !(prefix = strip_path_suffix(argv0_path, "git"))) { |
| prefix = PREFIX; |
| trace_printf("RUNTIME_PREFIX requested, " |
| "but prefix computation failed. " |
| "Using static fallback '%s'.\n", prefix); |
| } |
| #endif |
| |
| strbuf_addf(&d, "%s/%s", prefix, path); |
| path = strbuf_detach(&d, NULL); |
| return path; |
| } |
| |
| const char *git_extract_argv0_path(const char *argv0) |
| { |
| const char *slash; |
| |
| if (!argv0 || !*argv0) |
| return NULL; |
| slash = argv0 + strlen(argv0); |
| |
| while (argv0 <= slash && !is_dir_sep(*slash)) |
| slash--; |
| |
| if (slash >= argv0) { |
| argv0_path = xstrndup(argv0, slash - argv0); |
| return slash + 1; |
| } |
| |
| return argv0; |
| } |
| |
| void git_set_argv_exec_path(const char *exec_path) |
| { |
| argv_exec_path = exec_path; |
| /* |
| * Propagate this setting to external programs. |
| */ |
| setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1); |
| } |
| |
| |
| /* Returns the highest-priority, location to look for git programs. */ |
| const char *git_exec_path(void) |
| { |
| const char *env; |
| |
| if (argv_exec_path) |
| return argv_exec_path; |
| |
| env = getenv(EXEC_PATH_ENVIRONMENT); |
| if (env && *env) { |
| return env; |
| } |
| |
| return system_path(GIT_EXEC_PATH); |
| } |
| |
| static void add_path(struct strbuf *out, const char *path) |
| { |
| if (path && *path) { |
| if (is_absolute_path(path)) |
| strbuf_addstr(out, path); |
| else |
| strbuf_addstr(out, absolute_path(path)); |
| |
| strbuf_addch(out, PATH_SEP); |
| } |
| } |
| |
| void setup_path(void) |
| { |
| const char *old_path = getenv("PATH"); |
| struct strbuf new_path = STRBUF_INIT; |
| |
| add_path(&new_path, git_exec_path()); |
| add_path(&new_path, argv0_path); |
| |
| if (old_path) |
| strbuf_addstr(&new_path, old_path); |
| else |
| strbuf_addstr(&new_path, _PATH_DEFPATH); |
| |
| setenv("PATH", new_path.buf, 1); |
| |
| strbuf_release(&new_path); |
| } |
| |
| const char **prepare_git_cmd(const char **argv) |
| { |
| int argc; |
| const char **nargv; |
| |
| for (argc = 0; argv[argc]; argc++) |
| ; /* just counting */ |
| nargv = xmalloc(sizeof(*nargv) * (argc + 2)); |
| |
| nargv[0] = "git"; |
| for (argc = 0; argv[argc]; argc++) |
| nargv[argc + 1] = argv[argc]; |
| nargv[argc + 1] = NULL; |
| return nargv; |
| } |
| |
| int execv_git_cmd(const char **argv) { |
| const char **nargv = prepare_git_cmd(argv); |
| trace_argv_printf(nargv, "trace: exec:"); |
| |
| /* execvp() can only ever return if it fails */ |
| sane_execvp("git", (char **)nargv); |
| |
| trace_printf("trace: exec failed: %s\n", strerror(errno)); |
| |
| free(nargv); |
| return -1; |
| } |
| |
| |
| int execl_git_cmd(const char *cmd,...) |
| { |
| int argc; |
| const char *argv[MAX_ARGS + 1]; |
| const char *arg; |
| va_list param; |
| |
| va_start(param, cmd); |
| argv[0] = cmd; |
| argc = 1; |
| while (argc < MAX_ARGS) { |
| arg = argv[argc++] = va_arg(param, char *); |
| if (!arg) |
| break; |
| } |
| va_end(param); |
| if (MAX_ARGS <= argc) |
| return error("too many args to run %s", cmd); |
| |
| argv[argc] = NULL; |
| return execv_git_cmd(argv); |
| } |