20574f551b
These functions transform an existing argv into one suitable for exec-ing or spawning via git or a shell. We can use an argv_array in each to avoid dealing with manual counting and allocation. This also makes the memory allocation more clear and fixes some leaks. In prepare_shell_cmd, we would sometimes allocate a new string with "$@" in it and sometimes not, meaning the caller could not correctly free it. On the non-Windows side, we are in a child process which will exec() or exit() immediately, so the leak isn't a big deal. On Windows, though, we use spawn() from the parent process, and leak a string for each shell command we run. On top of that, the Windows code did not free the allocated argv array at all (but does for the prepare_git_cmd case!). By switching both of these functions to write into an argv_array, we can consistently free the result as appropriate. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
156 lines
3.0 KiB
C
156 lines
3.0 KiB
C
#include "cache.h"
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#include "exec_cmd.h"
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#include "quote.h"
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#include "argv-array.h"
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#define MAX_ARGS 32
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static const char *argv_exec_path;
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static const char *argv0_path;
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char *system_path(const char *path)
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{
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#ifdef RUNTIME_PREFIX
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static const char *prefix;
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#else
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static const char *prefix = PREFIX;
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#endif
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struct strbuf d = STRBUF_INIT;
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if (is_absolute_path(path))
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return xstrdup(path);
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#ifdef RUNTIME_PREFIX
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assert(argv0_path);
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assert(is_absolute_path(argv0_path));
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if (!prefix &&
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!(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) &&
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!(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
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!(prefix = strip_path_suffix(argv0_path, "git"))) {
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prefix = PREFIX;
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trace_printf("RUNTIME_PREFIX requested, "
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"but prefix computation failed. "
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"Using static fallback '%s'.\n", prefix);
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}
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#endif
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strbuf_addf(&d, "%s/%s", prefix, path);
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return strbuf_detach(&d, NULL);
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}
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const char *git_extract_argv0_path(const char *argv0)
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{
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const char *slash;
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if (!argv0 || !*argv0)
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return NULL;
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slash = argv0 + strlen(argv0);
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while (argv0 <= slash && !is_dir_sep(*slash))
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slash--;
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if (slash >= argv0) {
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argv0_path = xstrndup(argv0, slash - argv0);
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return slash + 1;
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}
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return argv0;
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}
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void git_set_argv_exec_path(const char *exec_path)
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{
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argv_exec_path = exec_path;
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/*
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* Propagate this setting to external programs.
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*/
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setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
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}
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/* Returns the highest-priority, location to look for git programs. */
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const char *git_exec_path(void)
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{
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const char *env;
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if (argv_exec_path)
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return argv_exec_path;
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env = getenv(EXEC_PATH_ENVIRONMENT);
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if (env && *env) {
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return env;
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}
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return system_path(GIT_EXEC_PATH);
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}
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static void add_path(struct strbuf *out, const char *path)
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{
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if (path && *path) {
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strbuf_add_absolute_path(out, path);
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strbuf_addch(out, PATH_SEP);
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}
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}
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void setup_path(void)
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{
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const char *old_path = getenv("PATH");
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struct strbuf new_path = STRBUF_INIT;
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add_path(&new_path, git_exec_path());
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if (old_path)
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strbuf_addstr(&new_path, old_path);
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else
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strbuf_addstr(&new_path, _PATH_DEFPATH);
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setenv("PATH", new_path.buf, 1);
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strbuf_release(&new_path);
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}
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const char **prepare_git_cmd(struct argv_array *out, const char **argv)
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{
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argv_array_push(out, "git");
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argv_array_pushv(out, argv);
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return out->argv;
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}
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int execv_git_cmd(const char **argv) {
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struct argv_array nargv = ARGV_ARRAY_INIT;
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prepare_git_cmd(&nargv, argv);
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trace_argv_printf(nargv.argv, "trace: exec:");
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/* execvp() can only ever return if it fails */
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sane_execvp("git", (char **)nargv.argv);
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trace_printf("trace: exec failed: %s\n", strerror(errno));
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argv_array_clear(&nargv);
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return -1;
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}
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int execl_git_cmd(const char *cmd,...)
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{
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int argc;
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const char *argv[MAX_ARGS + 1];
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const char *arg;
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va_list param;
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va_start(param, cmd);
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argv[0] = cmd;
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argc = 1;
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while (argc < MAX_ARGS) {
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arg = argv[argc++] = va_arg(param, char *);
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if (!arg)
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break;
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}
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va_end(param);
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if (MAX_ARGS <= argc)
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return error("too many args to run %s", cmd);
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argv[argc] = NULL;
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return execv_git_cmd(argv);
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}
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