editorial revision

[rrq/fusefile.git] / fusefile.8

diff --git a/fusefile.8 b/fusefile.8
index 183a362bce8c42bff4b27764ba01a4930625b37e..f9ca25db611e0a89d1ef3ef2d4d4cf07abd1d316 100644 (file)
--- a/fusefile.8
+++ b/fusefile.8
@@ -15,12 +15,12 @@ as a single, contiguous file. It accepts over-writing on the fused
 file which gets distributed accordingly to the fragments, but cannot
 change size.
 
-An optional overlay file is declared with the "-overlay:filename"
-argument between the mount point and the fragments. This file is then
-set up as an overlay for capturing writes to the fused file. The
-overlay file will contain the written fused file regions, followed by
-meta data to distinguish between written content and "holes" (where
-content comes from the fused fragments).
+An optional overlay file is declared with an
+\fB-overlay:\fIfilename\fR argument between the mount point and the
+fragments. This file is then set up as an overlay for capturing writes
+to the fused file. The overlay file will contain the written fused
+file regions, followed by meta data to distinguish between written
+content and "holes" (where content comes from the fused fragments).
 
 The fragment arguments include the filename of a source file, and
 optionally start and end byte positions. All in all there five
@@ -73,11 +73,31 @@ position 2442:
 \fB$ fusefile y x/2442: x/:2442\fR
 .RE
 
+Replace a partition in an image file with a different file
+.RS
+# Check the partition table
+.br
+\fB$ partx -oNR,START,SECTORS disk.raw\fR
+    NR   START  SECTORS
+     1    2048  2097152
+     2 2099200   409600
+     3 2508800 14268383
+.br
+# Replace partition 2 of 409600 sectors from 2099200 with
+.br
+# the file "insert.fat" clipped to 409600 sectors.
+.br
+\fB$ fusefile -ononempty disk.raw \\
+         disk.raw/0:$(( 2099200*512 )) \\
+         insert.fat/0:$(( 409600*512 )) \\
+         disk.raw/$(( (2099200+409600)*512 )):\fR
+.RE
+
 Protect raw disk image file with an overlay:
 .RS
-\fB# fusefile -ononempty disk.raw -overlay:today disk.raw
+\fB$ fusefile -ononempty disk.raw -overlay:today disk.raw\fR
 .RE
-By this set up, the overlay file, "today", will protect the disk image
+By that set up, the overlay file, "today", will protect the disk image
 file, "disk.raw" from changes, and also override the pathname
 "disk.raw" to be the fused file.
 
@@ -90,14 +110,17 @@ descriptors remain open, but the source fragments are not recomputed.
 If a source file changes the fused file will present the new content.
 If a source is reduced in size, access will be inconsistent.
 
-If the mountpoint file doesn't exist, then \fBfusefile\fR creates it,
-and removes it when unmounted.
+If the mountpoint file doesn't exist, then \fBfusefile\fR creates it.
+
+Unmounting is done with "\fBfusermount -u\fR \fImountpoint\fR" as
+usual.
 
 Using an overlay file makes the fused file writable regardless of the
-fused fragemnts with the overlay file containing any changes to the
+fused fragments with the overlay file containing any changes to the
 original. The overlay file is reusable for subsequent fusing of the
-same fragments for reconstructing a prior session.
+same fragments for reconstructing a prior session with changes.
 
 .SH AUTHOR
 
-Ralph Rönnquist <ralph.ronnquist@gmail.com>
+Ralph Rönnquist <ralph.ronnquist@gmail.com>.
+