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#include "mount.hh"
#include "error.hh"
#include "file-system.hh"
#include "logging.hh"
#if __linux__
#include <sys/mount.h>
namespace nix {
void bindPath(const Path & source, const Path & target, bool optional) {
debug("bind mounting '%1%' to '%2%'", source, target);
auto bindMount = [&]() {
if (mount(source.c_str(), target.c_str(), "", MS_BIND | MS_REC, 0) == -1)
throw SysError("bind mount from '%1%' to '%2%' failed", source, target);
};
auto maybeSt = maybeLstat(source);
if (!maybeSt) {
if (optional)
return;
else
throw SysError("getting attributes of path '%1%'", source);
}
auto st = *maybeSt;
if (S_ISDIR(st.st_mode)) {
createDirs(target);
bindMount();
} else if (S_ISLNK(st.st_mode)) {
// Symlinks can (apparently) not be bind-mounted, so just copy it
createDirs(dirOf(target));
copyFile(source, target, {});
} else {
createDirs(dirOf(target));
writeFile(target, "");
bindMount();
}
}
}
#endif
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