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https://github.com/git/git
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![Chris Webb](/assets/img/avatar_default.png)
The default executable path list used by exec_cmd.c is hard-coded to be "/usr/local/bin:/usr/bin:/bin". Use an appropriate value for the system from <paths.h> when available. Add HAVE_PATHS_H make variables and enable it on Linux, FreeBSD, NetBSD, OpenBSD and GNU where it is known to exist for now. Somebody else may want to do an autoconf support later. Signed-off-by: Chris Webb <chris@arachsys.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
169 lines
3.3 KiB
C
169 lines
3.3 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 *argv_exec_path;
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static const char *argv0_path;
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const 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 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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fprintf(stderr, "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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path = strbuf_detach(&d, NULL);
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return path;
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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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if (is_absolute_path(path))
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strbuf_addstr(out, path);
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else
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strbuf_addstr(out, make_nonrelative_path(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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add_path(&new_path, argv0_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(const char **argv)
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{
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int argc;
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const char **nargv;
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for (argc = 0; argv[argc]; argc++)
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; /* just counting */
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nargv = xmalloc(sizeof(*nargv) * (argc + 2));
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nargv[0] = "git";
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for (argc = 0; argv[argc]; argc++)
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nargv[argc + 1] = argv[argc];
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nargv[argc + 1] = NULL;
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return nargv;
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}
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int execv_git_cmd(const char **argv) {
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const char **nargv = prepare_git_cmd(argv);
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trace_argv_printf(nargv, "trace: exec:");
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/* execvp() can only ever return if it fails */
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execvp("git", (char **)nargv);
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trace_printf("trace: exec failed: %s\n", strerror(errno));
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free(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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