prompt.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "run-command.h"
   4 #include "strbuf.h"
   5 #include "prompt.h"
   6 #include "compat/terminal.h"
   7
   8 static char *do_askpass(const char *cmd, const char *prompt)
   9 {
  10         struct child_process pass = CHILD_PROCESS_INIT;
  11         const char *args[3];
  12         static struct strbuf buffer = STRBUF_INIT;
  13         int err = 0;
  14
  15         args[0] = cmd;
  16         args[1] = prompt;
  17         args[2] = NULL;
  18
  19         pass.argv = args;
  20         pass.out = -1;
  21
  22         if (start_command(&pass))
  23                 return NULL;
  24
  25         strbuf_reset(&buffer);
  26         if (strbuf_read(&buffer, pass.out, 20) < 0)
  27                 err = 1;
  28
  29         close(pass.out);
  30
  31         if (finish_command(&pass))
  32                 err = 1;
  33
  34         if (err) {
  35                 error("unable to read askpass response from '%s'", cmd);
  36                 strbuf_release(&buffer);
  37                 return NULL;
  38         }
  39
  40         strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
  41
  42         return buffer.buf;
  43 }
  44
  45 char *git_prompt(const char *prompt, int flags)
  46 {
  47         char *r = NULL;
  48
  49         if (flags & PROMPT_ASKPASS) {
  50                 const char *askpass;
  51
  52                 askpass = getenv("GIT_ASKPASS");
  53                 if (!askpass)
  54                         askpass = askpass_program;
  55                 if (!askpass)
  56                         askpass = getenv("SSH_ASKPASS");
  57                 if (askpass && *askpass)
  58                         r = do_askpass(askpass, prompt);
  59         }
  60
  61         if (!r) {
  62                 const char *err;
  63
  64                 if (git_env_bool("GIT_TERMINAL_PROMPT", 1)) {
  65                         r = git_terminal_prompt(prompt, flags & PROMPT_ECHO);
  66                         err = strerror(errno);
  67                 } else {
  68                         err = "terminal prompts disabled";
  69                 }
  70                 if (!r) {
  71                         /* prompts already contain ": " at the end */
  72                         die("could not read %s%s", prompt, err);
  73                 }
  74         }
  75         return r;
  76 }