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termio/exec: use bash instead of zsh for shell launching

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This commit is contained in:
Mitchell Hashimoto
2023-12-29 15:41:11 -08:00
parent 992888d4bd
commit a69ec2127e
1 changed files with 15 additions and 3 deletions
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18
src/termio/Exec.zig
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@ -878,10 +878,15 @@ const Subprocess = struct {
// "-q" flag to login(1).
//
// So to get all the behaviors we want, we specify "-l" but
// execute "zsh" (which is built-in to macOS). We then use
// the zsh builtin "exec" to replace the process with a login
// execute "bash" (which is built-in to macOS). We then use
// the bash builtin "exec" to replace the process with a login
// shell ("-l" on exec) with the command we really want.
//
// We use "bash" instead of other shells that ship with macOS
// because as of macOS Sonoma, we found with a microbenchmark
// that bash can `exec` into the desired command ~2x faster
// than zsh.
//
// To figure out a lot of this logic I read the login.c
// source code in the OSS distribution Apple provides for
// macOS.
@ -890,8 +895,15 @@ const Subprocess = struct {
try args.append("/usr/bin/login");
if (hush) try args.append("-q");
try args.append("-flp");
// We execute bash with "--noprofile --norc" so that it doesn't
// load startup files so that (1) our shell integration doesn't
// break and (2) user configuration doesn't mess this process
// up.
try args.append(username);
try args.append("/bin/sh");
try args.append("/bin/bash");
try args.append("--noprofile");
try args.append("--norc");
try args.append("-c");
try args.append(cmd);
break :args try args.toOwnedSlice();