built-in add -i: re-implement `revert` in C
[git] / 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 }