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-rw-r--r--doc/guix.texi13
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 906ebff555..a36b9691fb 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -5230,6 +5230,10 @@ following execution engines are supported:
Try user namespaces and fall back to PRoot if user namespaces are not
supported (see below).
+@item performance
+Try user namespaces and fall back to Fakechroot if user namespaces are
+not supported (see below).
+
@item userns
Run the program through user namespaces and abort if they are not
supported.
@@ -5241,6 +5245,15 @@ support for file system virtualization. It achieves that by using the
@code{ptrace} system call on the running program. This approach has the
advantage to work without requiring special kernel support, but it incurs
run-time overhead every time a system call is made.
+
+@item fakechroot
+Run through Fakechroot. @uref{https://github.com/dex4er/fakechroot/,
+Fakechroot} virtualizes file system accesses by intercepting calls to C
+library functions such as @code{open}, @code{stat}, @code{exec}, and so
+on. Unlike PRoot, it incurs very little overhead. However, it does not
+always work: for example, some file system accesses made from within the
+C library are not intercepted, and file system accesses made @i{via}
+direct syscalls are not intercepted either, leading to erratic behavior.
@end table
@vindex GUIX_EXECUTION_ENGINE