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Fix UNIX crash on startup when HOME isn't set

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Regression in [0] which re-introduced #2931.

Accessing environment variables must always null check the result.

Resolve by checking the result as well as replacing $HOME
access with a function that falls back to `passwd::pw_dir`.

Also add code-comments to to clarify the current behavior.

[0]: b308b360ebc7f6639b9f75a6c4cb469115fe2f3e
This commit is contained in:
Campbell Barton 2025-01-02 12:23:10 +11:00
parent 6d7b0c56c9
commit 1b0cef86fa
3 changed files with 20 additions and 2 deletions
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8
intern/ghost/intern/GHOST_SystemPathsUnix.cc
View File

@ -42,6 +42,9 @@ const char *GHOST_SystemPathsUnix::getSystemDir(int /*version*/, const char *ver
return nullptr;
}
/**
* See doc-string & code-comments for #BLI_dir_home which matches this functionality.
*/
static const char *home_dir_get()
{
const char *home_dir = getenv("HOME");
@ -128,7 +131,10 @@ const char *GHOST_SystemPathsUnix::getUserSpecialDir(GHOST_TUserSpecialDirTypes
}
/* If `XDG_CACHE_HOME` is not set, then `$HOME/.cache is used`. */
const char *home_dir = getenv("HOME");
const char *home_dir = home_dir_get();
if (home_dir == nullptr) {
return nullptr;
}
path = string(home_dir) + "/.cache";
return path.c_str();
}

8
source/blender/blenlib/BLI_fileops.h
View File

@ -230,8 +230,14 @@ char *BLI_current_working_dir(char *dir, size_t maxncpy) ATTR_WARN_UNUSED_RESULT
/**
* Get the user's home directory, i.e.
* - Unix: `$HOME`
* - Unix: `$HOME` or #passwd::pw_dir.
* - Windows: `%userprofile%`
*
* \return The home directory or null when it cannot be accessed.
*
* \note By convention, failure to access home means any derived directories fail as well
* instead of attempting to create a fallback such as `/`, `/tmp`, `C:\` ... etc.
* Although there may be rare cases where a fallback is appropriate.
*/
const char *BLI_dir_home(void);

6
source/blender/blenlib/intern/storage.cc
View File

@ -114,6 +114,12 @@ const char *BLI_dir_home()
#ifdef WIN32
home_dir = BLI_getenv("userprofile");
#else
/* Return the users home directory with a fallback when the environment variable isn't set.
* Failure to access `$HOME` is rare but possible, see: #2931.
*
* Any errors accessing home is likely caused by a broken/unsupported configuration,
* nevertheless, failing to null check would crash which makes the error difficult
* for users troubleshoot. */
home_dir = BLI_getenv("HOME");
if (home_dir == nullptr) {
if (const passwd *pwuser = getpwuid(getuid())) {