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.
 
 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
 
 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
 
 \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
 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
 .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.
 
 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 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
 
 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
 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
 
 
 .SH AUTHOR
 

-Ralph Rönnquist <ralph.ronnquist@gmail.com>
+Ralph Rönnquist <ralph.ronnquist@gmail.com>.
+