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Hopefully fix EPERM on macOS

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This commit is contained in:
Eelco Dolstra 2020-09-23 21:29:10 +02:00
parent 9a24ece122
commit 4ce8a3ed45
1 changed files with 40 additions and 32 deletions
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72
src/libstore/build.cc
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@ -1675,6 +1675,33 @@ void DerivationGoal::tryLocalBuild() {
} }
static void chmod_(const Path & path, mode_t mode)
{
if (chmod(path.c_str(), mode) == -1)
throw SysError("setting permissions on '%s'", path);
}
/* Move/rename path 'src' to 'dst'. Temporarily make 'src' writable if
it's a directory and we're not root (to be able to update the
directory's parent link ".."). */
static void movePath(const Path & src, const Path & dst)
{
auto st = lstat(src);
bool changePerm = (geteuid() && S_ISDIR(st.st_mode) && !(st.st_mode & S_IWUSR));
if (changePerm)
chmod_(src, st.st_mode | S_IWUSR);
if (rename(src.c_str(), dst.c_str()))
throw SysError("renaming '%1%' to '%2%'", src, dst);
if (changePerm)
chmod_(dst, st.st_mode);
}
void replaceValidPath(const Path & storePath, const Path & tmpPath) void replaceValidPath(const Path & storePath, const Path & tmpPath)
{ {
/* We can't atomically replace storePath (the original) with /* We can't atomically replace storePath (the original) with
@ -1683,12 +1710,20 @@ void replaceValidPath(const Path & storePath, const Path & tmpPath)
we're repairing (say) Glibc, we end up with a broken system. */ we're repairing (say) Glibc, we end up with a broken system. */
Path oldPath = (format("%1%.old-%2%-%3%") % storePath % getpid() % random()).str(); Path oldPath = (format("%1%.old-%2%-%3%") % storePath % getpid() % random()).str();
if (pathExists(storePath)) if (pathExists(storePath))
rename(storePath.c_str(), oldPath.c_str()); movePath(storePath, oldPath);
if (rename(tmpPath.c_str(), storePath.c_str()) == -1) {
auto ex = SysError("moving '%s' to '%s'", tmpPath, storePath); try {
rename(oldPath.c_str(), storePath.c_str()); // attempt to recover movePath(tmpPath, storePath);
throw ex; } catch (...) {
try {
// attempt to recover
movePath(oldPath, storePath);
} catch (...) {
ignoreException();
} }
throw;
}
deletePath(oldPath); deletePath(oldPath);
} }
@ -2006,13 +2041,6 @@ HookReply DerivationGoal::tryBuildHook()
} }
static void chmod_(const Path & path, mode_t mode)
{
if (chmod(path.c_str(), mode) == -1)
throw SysError("setting permissions on '%s'", path);
}
int childEntry(void * arg) int childEntry(void * arg)
{ {
((DerivationGoal *) arg)->runChild(); ((DerivationGoal *) arg)->runChild();
@ -3731,26 +3759,6 @@ void DerivationGoal::runChild()
} }
/* Move/rename path 'src' to 'dst'. Temporarily make 'src' writable if
it's a directory and we're not root (to be able to update the
directory's parent link ".."). */
static void movePath(const Path & src, const Path & dst)
{
auto st = lstat(src);
bool changePerm = (geteuid() && S_ISDIR(st.st_mode) && !(st.st_mode & S_IWUSR));
if (changePerm)
chmod_(src, st.st_mode | S_IWUSR);
if (rename(src.c_str(), dst.c_str()))
throw SysError("renaming '%1%' to '%2%'", src, dst);
if (changePerm)
chmod_(dst, st.st_mode);
}
void DerivationGoal::registerOutputs() void DerivationGoal::registerOutputs()
{ {
/* When using a build hook, the build hook can register the output /* When using a build hook, the build hook can register the output