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Diffstat (limited to 'doc/guix.texi')
| -rw-r--r-- | doc/guix.texi | 13 |
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 |