Andrew's git / gitweb.git /
f8f416b6460d7d2d4f5415258dadc7367412ba5a
   1#include "cache.h"
   2#include "exec_cmd.h"
   3#include "quote.h"
   4#define MAX_ARGS        32
   5
   6extern char **environ;
   7static const char *argv_exec_path;
   8static const char *argv0_path;
   9
  10const char *system_path(const char *path)
  11{
  12        static const char *prefix = PREFIX;
  13        struct strbuf d = STRBUF_INIT;
  14
  15        if (is_absolute_path(path))
  16                return path;
  17
  18        strbuf_addf(&d, "%s/%s", prefix, path);
  19        path = strbuf_detach(&d, NULL);
  20        return path;
  21}
  22
  23const char *git_extract_argv0_path(const char *argv0)
  24{
  25        const char *slash;
  26
  27        if (!argv0 || !*argv0)
  28                return NULL;
  29        slash = argv0 + strlen(argv0);
  30
  31        while (argv0 <= slash && !is_dir_sep(*slash))
  32                slash--;
  33
  34        if (slash >= argv0) {
  35                argv0_path = xstrndup(argv0, slash - argv0);
  36                return slash + 1;
  37        }
  38
  39        return argv0;
  40}
  41
  42void git_set_argv_exec_path(const char *exec_path)
  43{
  44        argv_exec_path = exec_path;
  45}
  46
  47
  48/* Returns the highest-priority, location to look for git programs. */
  49const char *git_exec_path(void)
  50{
  51        const char *env;
  52
  53        if (argv_exec_path)
  54                return argv_exec_path;
  55
  56        env = getenv(EXEC_PATH_ENVIRONMENT);
  57        if (env && *env) {
  58                return env;
  59        }
  60
  61        return system_path(GIT_EXEC_PATH);
  62}
  63
  64static void add_path(struct strbuf *out, const char *path)
  65{
  66        if (path && *path) {
  67                if (is_absolute_path(path))
  68                        strbuf_addstr(out, path);
  69                else
  70                        strbuf_addstr(out, make_nonrelative_path(path));
  71
  72                strbuf_addch(out, PATH_SEP);
  73        }
  74}
  75
  76void setup_path(void)
  77{
  78        const char *old_path = getenv("PATH");
  79        struct strbuf new_path = STRBUF_INIT;
  80
  81        add_path(&new_path, argv_exec_path);
  82        add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
  83        add_path(&new_path, system_path(GIT_EXEC_PATH));
  84        add_path(&new_path, argv0_path);
  85
  86        if (old_path)
  87                strbuf_addstr(&new_path, old_path);
  88        else
  89                strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
  90
  91        setenv("PATH", new_path.buf, 1);
  92
  93        strbuf_release(&new_path);
  94}
  95
  96const char **prepare_git_cmd(const char **argv)
  97{
  98        int argc;
  99        const char **nargv;
 100
 101        for (argc = 0; argv[argc]; argc++)
 102                ; /* just counting */
 103        nargv = xmalloc(sizeof(*nargv) * (argc + 2));
 104
 105        nargv[0] = "git";
 106        for (argc = 0; argv[argc]; argc++)
 107                nargv[argc + 1] = argv[argc];
 108        nargv[argc + 1] = NULL;
 109        return nargv;
 110}
 111
 112int execv_git_cmd(const char **argv) {
 113        const char **nargv = prepare_git_cmd(argv);
 114        trace_argv_printf(nargv, "trace: exec:");
 115
 116        /* execvp() can only ever return if it fails */
 117        execvp("git", (char **)nargv);
 118
 119        trace_printf("trace: exec failed: %s\n", strerror(errno));
 120
 121        free(nargv);
 122        return -1;
 123}
 124
 125
 126int execl_git_cmd(const char *cmd,...)
 127{
 128        int argc;
 129        const char *argv[MAX_ARGS + 1];
 130        const char *arg;
 131        va_list param;
 132
 133        va_start(param, cmd);
 134        argv[0] = cmd;
 135        argc = 1;
 136        while (argc < MAX_ARGS) {
 137                arg = argv[argc++] = va_arg(param, char *);
 138                if (!arg)
 139                        break;
 140        }
 141        va_end(param);
 142        if (MAX_ARGS <= argc)
 143                return error("too many args to run %s", cmd);
 144
 145        argv[argc] = NULL;
 146        return execv_git_cmd(argv);
 147}