1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
use std::process::{Command, Stdio};
use bstr::{BString, ByteSlice, ByteVec};
use crate::{helper, Program};
/// The kind of helper program to use.
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum Kind {
/// The built-in `git credential` helper program, part of any `git` distribution.
Builtin,
/// A custom credentials helper, as identified just by the name with optional arguments
ExternalName {
/// The name like `foo` along with optional args, like `foo --arg --bar="a b"`, with arguments using `sh` shell quoting rules.
/// The program executed will be `git-credential-foo [args]` if `name_and_args` starts with `foo [args]`.
/// Note that a shell is only used if it's needed.
name_and_args: BString,
},
/// A custom credentials helper, as identified just by the absolute path to the program and optional arguments. The program is executed through a shell.
ExternalPath {
/// The absolute path to the executable, like `/path/to/exe` along with optional args, like `/path/to/exe --arg --bar="a b"`, with arguments using `sh`
/// shell quoting rules.
path_and_args: BString,
},
/// A script to execute with `sh`.
ExternalShellScript(BString),
}
/// Initialization
impl Program {
/// Create a new program of the given `kind`.
pub fn from_kind(kind: Kind) -> Self {
Program {
kind,
child: None,
stderr: true,
}
}
/// Parse the given input as per the custom helper definition, supporting `!<script>`, `name` and `/absolute/name`, the latter two
/// also support arguments which are ignored here.
pub fn from_custom_definition(input: impl Into<BString>) -> Self {
fn from_custom_definition_inner(mut input: BString) -> Program {
let kind = if input.starts_with(b"!") {
input.remove(0);
Kind::ExternalShellScript(input)
} else {
let path = gix_path::from_bstr(
input
.find_byte(b' ')
.map_or(input.as_slice(), |pos| &input[..pos])
.as_bstr(),
);
if gix_path::is_absolute(path) {
Kind::ExternalPath { path_and_args: input }
} else {
Kind::ExternalName { name_and_args: input }
}
};
Program {
kind,
child: None,
stderr: true,
}
}
from_custom_definition_inner(input.into())
}
/// Convert the program into the respective command, suitable to invoke `action`.
pub fn to_command(&self, action: &helper::Action) -> std::process::Command {
let git_program = gix_path::env::exe_invocation();
let mut cmd = match &self.kind {
Kind::Builtin => {
let mut cmd = Command::from(gix_command::prepare(git_program));
cmd.arg("credential").arg(action.as_arg(false));
cmd
}
Kind::ExternalName { name_and_args } => {
let mut args = name_and_args.clone();
args.insert_str(0, "credential-");
args.insert_str(0, " ");
args.insert_str(0, git_program.to_string_lossy().as_ref());
gix_command::prepare(gix_path::from_bstr(args.as_bstr()).into_owned())
.arg(action.as_arg(true))
.command_may_be_shell_script_allow_manual_argument_splitting()
.into()
}
Kind::ExternalShellScript(for_shell)
| Kind::ExternalPath {
path_and_args: for_shell,
} => gix_command::prepare(gix_path::from_bstr(for_shell.as_bstr()).as_ref())
.command_may_be_shell_script()
.arg(action.as_arg(true))
.into(),
};
cmd.stdin(Stdio::piped())
.stdout(if action.expects_output() {
Stdio::piped()
} else {
Stdio::null()
})
.stderr(if self.stderr { Stdio::inherit() } else { Stdio::null() });
cmd
}
}
/// Builder
impl Program {
/// By default `stderr` of programs is inherited and typically displayed in the terminal.
pub fn suppress_stderr(mut self) -> Self {
self.stderr = false;
self
}
}
impl Program {
pub(crate) fn start(
&mut self,
action: &helper::Action,
) -> std::io::Result<(std::process::ChildStdin, Option<std::process::ChildStdout>)> {
assert!(self.child.is_none(), "BUG: must not call `start()` twice");
let mut cmd = self.to_command(action);
gix_trace::debug!(cmd = ?cmd, "launching credential helper");
let mut child = cmd.spawn()?;
let stdin = child.stdin.take().expect("stdin to be configured");
let stdout = child.stdout.take();
self.child = child.into();
Ok((stdin, stdout))
}
pub(crate) fn finish(&mut self) -> std::io::Result<()> {
let mut child = self.child.take().expect("Call `start()` before calling finish()");
let status = child.wait()?;
if status.success() {
Ok(())
} else {
Err(std::io::Error::other(format!(
"Credentials helper program failed with status code {:?}",
status.code()
)))
}
}
}
///
pub mod main;
pub use main::function::main;