6ce4e61f1b
If GIT_TRACE is set to an absolute path (starting with a '/' character), we interpret this as a file path and we trace into it. Also if GIT_TRACE is set to an integer value greater than 1 and lower than 10, we interpret this as an open fd value and we trace into it. Note that this behavior is not compatible with the previous one. We also trace whole messages using one write(2) call to make sure messages from processes do net get mixed up in the middle. This patch makes it possible to get trace information when running "make test". Signed-off-by: Christian Couder <chriscool@tuxfamily.org> 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("GIT_EXEC_PATH");
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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("GIT_EXEC_PATH"),
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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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