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fix: Treat empty TMPDIR as unset

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Fixes an instance of

    nix: src/libutil/util.cc:139: nix::Path nix::canonPath(PathView, bool): Assertion `path != ""' failed.

... which I've been getting in one of my shells for some reason.
I have yet to find out why TMPDIR was empty, but it's no reason for
Nix to break.
This commit is contained in:
Robert Hensing 2024-03-22 22:41:50 +01:00
parent a223280664
commit c3fb2aa1f9
4 changed files with 12 additions and 4 deletions
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2
src/libstore/globals.cc
View file

@ -415,7 +415,7 @@ void initLibStore() {
sshd). This breaks build users because they don't have access
to the TMPDIR, in particular in ‘nix-store --serve’. */
#if __APPLE__
if (hasPrefix(getEnv("TMPDIR").value_or("/tmp"), "/var/folders/"))
if (hasPrefix(defaultTempDir(), "/var/folders/"))
unsetenv("TMPDIR");
#endif

8
src/libutil/file-system.cc
View file

@ -494,10 +494,14 @@ void AutoDelete::reset(const Path & p, bool recursive) {
//////////////////////////////////////////////////////////////////////
std::string defaultTempDir() {
return getEnvNonEmpty("TMPDIR").value_or("/tmp");
}
static Path tempName(Path tmpRoot, const Path & prefix, bool includePid,
std::atomic<unsigned int> & counter)
{
tmpRoot = canonPath(tmpRoot.empty() ? getEnv("TMPDIR").value_or("/tmp") : tmpRoot, true);
tmpRoot = canonPath(tmpRoot.empty() ? defaultTempDir() : tmpRoot, true);
if (includePid)
return fmt("%1%/%2%-%3%-%4%", tmpRoot, prefix, getpid(), counter++);
else
@ -537,7 +541,7 @@ Path createTempDir(const Path & tmpRoot, const Path & prefix,
std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix)
{
Path tmpl(getEnv("TMPDIR").value_or("/tmp") + "/" + prefix + ".XXXXXX");
Path tmpl(defaultTempDir() + "/" + prefix + ".XXXXXX");
// Strictly speaking, this is UB, but who cares...
// FIXME: use O_TMPFILE.
AutoCloseFD fd(mkstemp((char *) tmpl.c_str()));

4
src/libutil/file-system.hh
View file

@ -234,6 +234,10 @@ Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",
*/
std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix = "nix");
/**
* Return `TMPDIR`, or the default temporary directory if unset or empty.
*/
Path defaultTempDir();
/**
* Used in various places.

2
src/nix-build/nix-build.cc
View file

@ -476,7 +476,7 @@ static void main_nix_build(int argc, char * * argv)
auto env = getEnv();
auto tmp = getEnv("TMPDIR");
if (!tmp) tmp = getEnv("XDG_RUNTIME_DIR").value_or("/tmp");
if (!tmp || tmp->empty()) tmp = getEnv("XDG_RUNTIME_DIR").value_or("/tmp");
if (pure) {
decltype(env) newEnv;