In the chroot, make all mounted filesystems private

This is required on systemd, which mounts filesystems as "shared"
subtrees.  Changes to shared trees in a private mount namespace are
propagated to the outside world, which is bad.

2 files changed, 3 insertions, 3 deletions

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 9d8e4afed3..fe4fedfa59 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -224,12 +224,12 @@ string readFile(int fd)
 }
 
 
-string readFile(const Path & path)
+string readFile(const Path & path, bool drain)
 {
     AutoCloseFD fd = open(path.c_str(), O_RDONLY);
     if (fd == -1)
         throw SysError(format("opening file `%1%'") % path);
-    return readFile(fd);
+    return drain ? drainFD(fd) : readFile(fd);
 }
 
 
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index dc38a53ca2..22992bbafe 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -63,7 +63,7 @@ Strings readDirectory(const Path & path);
 
 /* Read the contents of a file into a string. */
 string readFile(int fd);
-string readFile(const Path & path);
+string readFile(const Path & path, bool drain = false);
 
 /* Write a string to a file. */
 void writeFile(const Path & path, const string & s);