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Improve xrepo env to add session id#7135

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waruqi merged 3 commits intodevfrom
session
Dec 15, 2025
Merged

Improve xrepo env to add session id#7135
waruqi merged 3 commits intodevfrom
session

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@waruqi waruqi commented Dec 15, 2025

@waruqi waruqi added this to the v3.0.6 milestone Dec 15, 2025
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Summary of Changes

Hello @waruqi, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the xrepo env command by introducing a robust mechanism for generating unique session identifiers for terminal sessions. This identifier is then used to make the temporary working directory for xrepo env session-specific, effectively preventing potential conflicts and improving the stability of the command when multiple instances are run simultaneously in different terminal windows.

Highlights

  • New tty.session_id() Function: Introduced a new cross-platform function to retrieve a unique identifier for the current terminal session, implemented in C and exposed to Lua.
  • Session-Specific xrepo env Working Directory: The temporary working directory created by the xrepo env command now incorporates the unique session ID, ensuring isolation and preventing conflicts between concurrent instances.
  • Lua API for Session ID: A new Lua function tty.session_id() is provided, which caches and returns a hashed 32-bit integer representing the current terminal session ID.
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Code Review

This pull request introduces a session ID to create unique temporary working directories for xrepo env, which effectively resolves potential conflicts between concurrent sessions. The implementation is well-structured, with a new C function to get a platform-specific session identifier, which is then exposed to and used in Lua scripts. My review includes one suggestion to improve thread safety in the C implementation.

Comment on lines +55 to +59
tb_char_t const* name = ttyname(STDIN_FILENO);
if (name) {
lua_pushstring(lua, name);
return 1;
}
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medium

The ttyname() function is not thread-safe on many platforms as it may return a pointer to a static buffer. Since xmake can utilize multiple threads, it is safer to use the reentrant version, ttyname_r(), to prevent potential race conditions.

Suggested change
tb_char_t const* name = ttyname(STDIN_FILENO);
if (name) {
lua_pushstring(lua, name);
return 1;
}
tb_char_t name_buf[256];
if (ttyname_r(STDIN_FILENO, name_buf, sizeof(name_buf)) == 0) {
lua_pushstring(lua, name_buf);
return 1;
}

@waruqi waruqi merged commit bab1a61 into dev Dec 15, 2025
67 checks passed
@waruqi waruqi deleted the session branch December 15, 2025 08:49
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