mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
d4ebc36c5e
We broke the discipline Linus set up to allow compiler help us avoid typos in environment names in the early days of git over time. This defines a handful preprocessor constants for environment variable names used in relatively core parts of the system. I've left out variable names specific to subsystems such as HTTP and SSL as I do not think they are big problems. Signed-off-by: Junio C Hamano <junkio@cox.net>
136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
#include "cache.h"
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#include "exec_cmd.h"
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#include "quote.h"
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#define MAX_ARGS 32
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extern char **environ;
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static const char *builtin_exec_path = GIT_EXEC_PATH;
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static const char *current_exec_path;
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void git_set_exec_path(const char *exec_path)
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{
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current_exec_path = exec_path;
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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 (current_exec_path)
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return current_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 builtin_exec_path;
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}
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int execv_git_cmd(const char **argv)
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{
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char git_command[PATH_MAX + 1];
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int i;
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const char *paths[] = { current_exec_path,
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getenv(EXEC_PATH_ENVIRONMENT),
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builtin_exec_path };
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for (i = 0; i < ARRAY_SIZE(paths); ++i) {
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size_t len;
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int rc;
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const char *exec_dir = paths[i];
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const char *tmp;
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if (!exec_dir || !*exec_dir) continue;
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if (*exec_dir != '/') {
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if (!getcwd(git_command, sizeof(git_command))) {
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fprintf(stderr, "git: cannot determine "
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"current directory: %s\n",
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strerror(errno));
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break;
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}
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len = strlen(git_command);
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/* Trivial cleanup */
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while (!strncmp(exec_dir, "./", 2)) {
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exec_dir += 2;
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while (*exec_dir == '/')
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exec_dir++;
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}
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rc = snprintf(git_command + len,
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sizeof(git_command) - len, "/%s",
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exec_dir);
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if (rc < 0 || rc >= sizeof(git_command) - len) {
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fprintf(stderr, "git: command name given "
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"is too long.\n");
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break;
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}
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} else {
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if (strlen(exec_dir) + 1 > sizeof(git_command)) {
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fprintf(stderr, "git: command name given "
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"is too long.\n");
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break;
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}
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strcpy(git_command, exec_dir);
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}
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len = strlen(git_command);
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rc = snprintf(git_command + len, sizeof(git_command) - len,
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"/git-%s", argv[0]);
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if (rc < 0 || rc >= sizeof(git_command) - len) {
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fprintf(stderr,
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"git: command name given is too long.\n");
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break;
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}
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/* argv[0] must be the git command, but the argv array
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* belongs to the caller, and my be reused in
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* subsequent loop iterations. Save argv[0] and
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* restore it on error.
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*/
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tmp = argv[0];
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argv[0] = git_command;
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trace_argv_printf(argv, -1, "trace: exec:");
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/* execve() can only ever return if it fails */
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execve(git_command, (char **)argv, environ);
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trace_printf("trace: exec failed: %s\n", strerror(errno));
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argv[0] = tmp;
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}
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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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