1use std::path::Path;
2
3use anyhow::{Context as _, Result};
4use collections::HashMap;
5
6use crate::shell::ShellKind;
7
8pub fn print_env() {
9 let env_vars: HashMap<String, String> = std::env::vars().collect();
10 let json = serde_json::to_string_pretty(&env_vars).unwrap_or_else(|err| {
11 eprintln!("Error serializing environment variables: {}", err);
12 std::process::exit(1);
13 });
14 println!("{}", json);
15}
16
17/// Capture all environment variables from the login shell in the given directory.
18pub async fn capture(
19 shell_path: impl AsRef<Path>,
20 args: &[String],
21 directory: impl AsRef<Path>,
22) -> Result<collections::HashMap<String, String>> {
23 #[cfg(windows)]
24 return capture_windows(shell_path.as_ref(), args, directory.as_ref()).await;
25 #[cfg(unix)]
26 return capture_unix(shell_path.as_ref(), args, directory.as_ref()).await;
27}
28
29#[cfg(unix)]
30async fn capture_unix(
31 shell_path: &Path,
32 args: &[String],
33 directory: &Path,
34) -> Result<collections::HashMap<String, String>> {
35 use std::os::unix::process::CommandExt;
36
37 use crate::command::new_std_command;
38
39 let shell_kind = ShellKind::new(shell_path, false);
40 let zed_path = super::get_shell_safe_zed_path(shell_kind)?;
41
42 let mut command_string = String::new();
43 let mut command = new_std_command(shell_path);
44 command.args(args);
45 // In some shells, file descriptors greater than 2 cannot be used in interactive mode,
46 // so file descriptor 0 (stdin) is used instead. This impacts zsh, old bash; perhaps others.
47 // See: https://github.com/zed-industries/zed/pull/32136#issuecomment-2999645482
48 const FD_STDIN: std::os::fd::RawFd = 0;
49 const FD_STDOUT: std::os::fd::RawFd = 1;
50 const FD_STDERR: std::os::fd::RawFd = 2;
51
52 let (fd_num, redir) = match shell_kind {
53 ShellKind::Rc => (FD_STDIN, format!(">[1={}]", FD_STDIN)), // `[1=0]`
54 ShellKind::Nushell | ShellKind::Tcsh => (FD_STDOUT, "".to_string()),
55 // xonsh doesn't support redirecting to stdin, and control sequences are printed to
56 // stdout on startup
57 ShellKind::Xonsh => (FD_STDERR, "o>e".to_string()),
58 _ => (FD_STDIN, format!(">&{}", FD_STDIN)), // `>&0`
59 };
60
61 match shell_kind {
62 ShellKind::Csh | ShellKind::Tcsh => {
63 // For csh/tcsh, login shell requires passing `-` as 0th argument (instead of `-l`)
64 command.arg0("-");
65 }
66 ShellKind::Fish => {
67 // in fish, asdf, direnv attach to the `fish_prompt` event
68 command_string.push_str("emit fish_prompt;");
69 command.arg("-l");
70 }
71 _ => {
72 command.arg("-l");
73 }
74 }
75 // cd into the directory, triggering directory specific side-effects (asdf, direnv, etc)
76 command_string.push_str(&format!("cd '{}';", directory.display()));
77 if let Some(prefix) = shell_kind.command_prefix() {
78 command_string.push(prefix);
79 }
80 command_string.push_str(&format!("{} --printenv {}", zed_path, redir));
81 command.args(["-i", "-c", &command_string]);
82
83 super::set_pre_exec_to_start_new_session(&mut command);
84
85 let (env_output, process_output) = spawn_and_read_fd(command, fd_num).await?;
86 let env_output = String::from_utf8_lossy(&env_output);
87
88 anyhow::ensure!(
89 process_output.status.success(),
90 "login shell exited with {}. stdout: {:?}, stderr: {:?}",
91 process_output.status,
92 String::from_utf8_lossy(&process_output.stdout),
93 String::from_utf8_lossy(&process_output.stderr),
94 );
95
96 // Parse the JSON output from zed --printenv
97 let env_map: collections::HashMap<String, String> = serde_json::from_str(&env_output)
98 .with_context(|| {
99 format!("Failed to deserialize environment variables from json: {env_output}")
100 })?;
101 Ok(env_map)
102}
103
104#[cfg(unix)]
105async fn spawn_and_read_fd(
106 mut command: std::process::Command,
107 child_fd: std::os::fd::RawFd,
108) -> anyhow::Result<(Vec<u8>, std::process::Output)> {
109 use command_fds::{CommandFdExt, FdMapping};
110 use std::{io::Read, process::Stdio};
111
112 let (mut reader, writer) = std::io::pipe()?;
113
114 command.fd_mappings(vec![FdMapping {
115 parent_fd: writer.into(),
116 child_fd,
117 }])?;
118
119 let process = smol::process::Command::from(command)
120 .stdin(Stdio::null())
121 .stdout(Stdio::piped())
122 .stderr(Stdio::piped())
123 .spawn()?;
124
125 let mut buffer = Vec::new();
126 reader.read_to_end(&mut buffer)?;
127
128 Ok((buffer, process.output().await?))
129}
130
131#[cfg(windows)]
132async fn capture_windows(
133 shell_path: &Path,
134 _args: &[String],
135 directory: &Path,
136) -> Result<collections::HashMap<String, String>> {
137 use std::process::Stdio;
138
139 let zed_path =
140 std::env::current_exe().context("Failed to determine current zed executable path.")?;
141
142 let shell_kind = ShellKind::new(shell_path, true);
143 if let ShellKind::Csh | ShellKind::Tcsh | ShellKind::Rc | ShellKind::Fish | ShellKind::Xonsh =
144 shell_kind
145 {
146 return Err(anyhow::anyhow!("unsupported shell kind"));
147 }
148 let mut cmd = crate::command::new_smol_command(shell_path);
149 let cmd = match shell_kind {
150 ShellKind::Csh | ShellKind::Tcsh | ShellKind::Rc | ShellKind::Fish | ShellKind::Xonsh => {
151 unreachable!()
152 }
153 ShellKind::Posix => cmd.args([
154 "-c",
155 &format!(
156 "cd '{}'; '{}' --printenv",
157 directory.display(),
158 zed_path.display()
159 ),
160 ]),
161 ShellKind::PowerShell => cmd.args([
162 "-NonInteractive",
163 "-NoProfile",
164 "-Command",
165 &format!(
166 "Set-Location '{}'; & '{}' --printenv",
167 directory.display(),
168 zed_path.display()
169 ),
170 ]),
171 ShellKind::Elvish => cmd.args([
172 "-c",
173 &format!(
174 "cd '{}'; '{}' --printenv",
175 directory.display(),
176 zed_path.display()
177 ),
178 ]),
179 ShellKind::Nushell => cmd.args([
180 "-c",
181 &format!(
182 "cd '{}'; {}'{}' --printenv",
183 directory.display(),
184 shell_kind
185 .command_prefix()
186 .map(|prefix| prefix.to_string())
187 .unwrap_or_default(),
188 zed_path.display()
189 ),
190 ]),
191 ShellKind::Cmd => cmd.args([
192 "/c",
193 "cd",
194 &directory.display().to_string(),
195 "&&",
196 &zed_path.display().to_string(),
197 "--printenv",
198 ]),
199 }
200 .stdin(Stdio::null())
201 .stdout(Stdio::piped())
202 .stderr(Stdio::piped());
203 let output = cmd
204 .output()
205 .await
206 .with_context(|| format!("command {cmd:?}"))?;
207 anyhow::ensure!(
208 output.status.success(),
209 "Command {cmd:?} failed with {}. stdout: {:?}, stderr: {:?}",
210 output.status,
211 String::from_utf8_lossy(&output.stdout),
212 String::from_utf8_lossy(&output.stderr),
213 );
214 let env_output = String::from_utf8_lossy(&output.stdout);
215
216 // Parse the JSON output from zed --printenv
217 serde_json::from_str(&env_output).with_context(|| {
218 format!("Failed to deserialize environment variables from json: {env_output}")
219 })
220}