Xaizek: /* Sources */ Fix issue number

2017-09-09T18:16:45Z

Sources: Fix issue number

Xaizek: Initial version of the page

2017-09-09T18:13:55Z

Initial version of the page

New page

==== Performance of FUSE mounts ====

Since FUSE file systems can be used with vifm to browse archives and one of the most common task with an archive is extraction of files it contains, it's natural to use copy operation to do that in vifm. Unfortunately there are some issues with performance, which make this significantly slower than it should be. This doesn't seem to be an artifact of FUSE architecture, but rather unoptimized implementation of FUSE mounters. Copying is an I/O intensive operation and vifm sends many requests and because FUSE mounters don't seem to cache even path resolution each request ends up taking a lot of time (relative to time necessary to transfer data itself).

As a workaround this page presents a script, which can be invoked from vifm to extract files from an archive by using 7z and without use of FUSE.

==== Warning ====

The script wasn't thoroughly tested, so check that it works correctly before relying on it.

==== Script ====

<source lang="bash">
#!/usr/bin/bash

if [ -z "$VIFM_FUSE_FILE" ]; then
echo "error: this command is meant to be run inside vifm FUSE mount"
exit 1
fi

archive="$VIFM_FUSE_FILE"
filename="${archive##*/}"

#Because 7z can't extract these files in one call:
doubleExtraction=0
if [[ $filename =~ ^.*(tar\.gz|tar\.bz2)$ ]] ;
then
doubleExtraction=1
fi

fusehome="$1"
shift
destination="$1"
shift

tempDest=`mktemp -d`

files=
for f; do
# obtain relative path inside archive
f="${f#$fusehome}"
f="${f#/}"
f="${f#*/}"

files=( ${files[@]} "$f" )
done

firstFile=${files[@]:0:1}
IFS='/' read -ra ADDR <<< $firstFile
unset ADDR[${#ADDR[@]}-1]

movePath=$tempDest/
for i in "${ADDR[@]}"; do
movePath=$movePath$i/
done
movePath=$movePath*

if [[ $doubleExtraction = 1 ]]; then
exec 7z x -so "$archive" | 7z x -si -ttar -o$tempDest "${files[@]}" > /dev/null 2>&1 && mv -i $movePath $destination && rm -r $tempDest
else
exec 7z x -o$tempDest "$archive" "${files[@]}" > /dev/null 2>&1 && mv -i $movePath $destination && rm -r $tempDest
fi
</source>

==== vifmrc part ====

Assuming that the script is called <code>extract-files</code> and is somewhere in <code>$PATH</code>, the command to add to <code>vifmrc</code> is:

<source lang="vim">
command! extractfiles :execute '!%%n extract-files' &fusehome expand('%%D') expand('%%f:p')
</source>

==== How to use ====

When inside FUSE mounted archive, select files you want to extract into current directory of the inactive pane and run <code>:extractfiles</code> command.

==== Sources ====

[https://github.com/vifm/vifm/issues/92 Issue #71 on GitHub]

[[Category:HOWTO]]

@@ Line 77: / Line 77: @@
 ==== Sources ====
-[https://github.com/vifm/vifm/issues/92 Issue #71 on GitHub]
+[https://github.com/vifm/vifm/issues/92 Issue #92 on GitHub]
 [[Category:HOWTO]]

How to extract files from archives efficiently - Revision history

Xaizek: /* Sources */ Fix issue number

Xaizek: Initial version of the page