prompt.c

   1 #include "cache.h"
   2 #include "run-command.h"
   3 #include "strbuf.h"
   4 #include "prompt.h"
   5 #include "compat/terminal.h"
   6
   7 static char *do_askpass(const char *cmd, const char *prompt)
   8 {
   9         struct child_process pass = CHILD_PROCESS_INIT;
  10         const char *args[3];
  11         static struct strbuf buffer = STRBUF_INIT;
  12         int err = 0;
  13
  14         args[0] = cmd;
  15         args[1] = prompt;
  16         args[2] = NULL;
  17
  18         pass.argv = args;
  19         pass.out = -1;
  20
  21         if (start_command(&pass))
  22                 return NULL;
  23
  24         strbuf_reset(&buffer);
  25         if (strbuf_read(&buffer, pass.out, 20) < 0)
  26                 err = 1;
  27
  28         close(pass.out);
  29
  30         if (finish_command(&pass))
  31                 err = 1;
  32
  33         if (err) {
  34                 error("unable to read askpass response from '%s'", cmd);
  35                 strbuf_release(&buffer);
  36                 return NULL;
  37         }
  38
  39         strbuf_setlen(&buffer, strcspn(buffer.buf, "\r\n"));
  40
  41         return buffer.buf;
  42 }
  43
  44 char *git_prompt(const char *prompt, int flags)
  45 {
  46         char *r = NULL;
  47
  48         if (flags & PROMPT_ASKPASS) {
  49                 const char *askpass;
  50
  51                 askpass = getenv("GIT_ASKPASS");
  52                 if (!askpass)
  53                         askpass = askpass_program;
  54                 if (!askpass)
  55                         askpass = getenv("SSH_ASKPASS");
  56                 if (askpass && *askpass)
  57                         r = do_askpass(askpass, prompt);
  58         }
  59
  60         if (!r) {
  61                 const char *err;
  62
  63                 if (git_env_bool("GIT_TERMINAL_PROMPT", 1)) {
  64                         r = git_terminal_prompt(prompt, flags & PROMPT_ECHO);
  65                         err = strerror(errno);
  66                 } else {
  67                         err = "terminal prompts disabled";
  68                 }
  69                 if (!r) {
  70                         /* prompts already contain ": " at the end */
  71                         die("could not read %s%s", prompt, err);
  72                 }
  73         }
  74         return r;
  75 }
  76
  77 char *git_getpass(const char *prompt)
  78 {
  79         return git_prompt(prompt, PROMPT_ASKPASS);
  80 }