Add a hostname override

Based on issue #82, we now provide `-B` to override the hostname. In
particular:

- `mkrc -B foo` will enable `-o` but with the hostname set up `foo`.
- `lsrc -B foo` will work like normal `lsrc` except it treats `host-foo`
as the host-specific directory.
- `rcup -B foo` will run a normal `rcup` except `host-foo` is the
host-specific directory.
- `rcdn -B foo` is just like normal `rcdn`, but with `host-foo` as the
  host-specific directory.

The `HOSTNAME` can also be set in the rcrc(5), and this is overridden by
the aforementioned `-B`.

While making this change: The `test/Makefile.am` used a mix of tabs and
spaces. Since it's a Makefile, replace it all with tabs.

1 files changed, 7 insertions, 0 deletions

diff --git a/man/rcrc.5 b/man/rcrc.5
index 3872795..bc72329 100644
--- a/man/rcrc.5
+++ b/man/rcrc.5
@@ -44,6 +44,12 @@ explained in detail in
 under the section
 .Sx EXCLUDE PATTERN .
 .
+.It Va HOSTNAME
+the hostname for this computer. This is normally computed using the
+.Xr hostname 1
+command, but this command is non-standard and can prove unreliable. The
+.Va HOSTNAME
+variable forces a known hostname.
 .It Va TAGS
 the default tags.
 .
@@ -62,6 +68,7 @@ under the section
 .Dl COPY_ALWAYS="*"
 .Dl DOTFILES_DIRS="/home/mike/.dotfiles /usr/share/dotfiles"
 .Dl EXCLUDES="irbrc *:*emacs* dotfiles:python*"
+.Dl HOSTNAME="eggplant"
 .Dl TAGS="freebsd development email git laptop gmail notmuch"
 .Dl SYMLINK_DIRS="zprezto"
 .Sh SEE ALSO