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-rw-r--r--nix/libstore/build.cc26
1 files changed, 23 insertions, 3 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index 88f8d11103..ccec513d8d 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -1946,6 +1946,15 @@ void DerivationGoal::startBuilder()
}
+/* Return true if the operating system kernel part of SYSTEM1 and SYSTEM2 (the
+ bit that comes after the hyphen in system types such as "i686-linux") is
+ the same. */
+static bool sameOperatingSystemKernel(const std::string& system1, const std::string& system2)
+{
+ auto os1 = system1.substr(system1.find("-"));
+ auto os2 = system2.substr(system2.find("-"));
+ return os1 == os2;
+}
void DerivationGoal::runChild()
{
@@ -2208,9 +2217,20 @@ void DerivationGoal::runChild()
foreach (Strings::iterator, i, drv.args)
args.push_back(rewriteHashes(*i, rewritesToTmp));
- execve(drv.builder.c_str(), stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
-
- int error = errno;
+ /* If DRV targets the same operating system kernel, try to execute it:
+ there might be binfmt_misc set up for user-land emulation of other
+ architectures. However, if it targets a different operating
+ system--e.g., "i586-gnu" vs. "x86_64-linux"--do not try executing
+ it: the ELF file for that OS is likely indistinguishable from a
+ native ELF binary and it would just crash at run time. */
+ int error;
+ if (sameOperatingSystemKernel(drv.platform, settings.thisSystem)) {
+ execve(drv.builder.c_str(), stringsToCharPtrs(args).data(),
+ stringsToCharPtrs(envStrs).data());
+ error = errno;
+ } else {
+ error = ENOEXEC;
+ }
/* Right platform? Check this after we've tried 'execve' to allow for
transparent emulation of different platforms with binfmt_misc