<!ELEMENT unpack (digest?, reference*, archive, destination)>
This element occurs in : Element : <alfs> | Element: <stage>
See also : Element : <archive> | Element: <destination> | Element: <digest> | Element: <reference>
The element unpack is one of the top-level operation elements. It is used to unpack an archive into a destination directory
The sub-element reference gives the URL of the archive; it is only used if the archive file is not available locally.
The sub-element digest gives the digest of the archive, as computed by openssl, using the digest type specified in the attribute type.
The sub-element archive gives the name of the archive, and the sub-element destination gives the name of the directory in which the archive is unpacked.
<unpack> <digest>cbe9f79450aeecfb06d5e856af16c2cf</digest> <reference>ftp://ftp.gnu.org/gnu/gzip/gzip.1.2.4a.tar.gz</reference> <archive>/usr/src/lfs-packages/gzip.1.2.4a.tar.gz</archive> <destination>/usr/src</destination> </unpack>
The equivalent bash script is :
echo Unpacking /usr/src/lfs-packages/gzip.1.2.4a.tar.gz into /usr/src [[ ! -f /usr/src/lfs-packages/gzip.1.2.4a.tar.gz ]] && echo Retrieving ftp://ftp.gnu.org/gnu/gzip/gzip.1.2.4a.tar.gz [[ ! -f /usr/src/lfs-packages/gzip.1.2.4a.tar.gz ]] && wget -O /usr/src/lfs-packages/gzip.1.2.4a.tar.gz ftp://ftp.gnu.org/gnu/gzip/gzip.1.2.4a.tar.gz [[ ! -f /usr/src/lfs-packages/gzip.1.2.4a.tar.gz ]] && echo Archive does not exist && exit 3 cd /usr/src tar xzvf /usr/src/lfs-packages/gzip.1.2.4a.tar.gz