Difference between revisions of "Get Appliance Info"
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== Linux file extraction from tar.gz archive == | == Linux file extraction from tar.gz archive == | ||
− | The following will serve as a tutorial on linux '''tar''' file creation and selective extraction and concatenation. | + | The following will serve as a tutorial on linux '''tar''' file creation and selective extraction and concatenation. If we were to use real templates which are big, they would take a long time to extract and concatenate and hence this dummy file set example. |
+ | |||
+ | === Create some files === | ||
+ | First we create a folder and place two files in it with different content: | ||
+ | <source lang="bash"> | ||
+ | mkdir files | ||
+ | cat << EOF > files/file1.txt | ||
+ | This is file 1 in archive 1 | ||
+ | This is line 2 of file 1 in archive 1 | ||
+ | |||
+ | EOF | ||
+ | |||
+ | sed -e 's/file 1/file 2/g' files/file1.txt > files/file2.txt | ||
+ | </source> | ||
+ | |||
+ | === Archive the files === | ||
+ | We now archive this folder with both it's files: | ||
+ | <source lang="bash"> | ||
+ | tar -czf archive1.tar.gz files | ||
+ | </source> | ||
+ | |||
+ | === Create a second archive with different files === | ||
+ | <source lang="bash"> | ||
+ | sed -e 's/archive 1/archive 2/g' -i files/file1.txt | ||
+ | sed -e 's/archive 1/archive 2/g' -i files/file2.txt | ||
+ | tar -czf archive2.tar.gz files | ||
+ | |||
+ | rm -rf files | ||
+ | </source> | ||
+ | |||
+ | === Single file extraction === |
Revision as of 10:01, 3 November 2014
Introduction
All OpenVZ appliance templates created with Debian Appliance Builder will have the dab.conf file embedded in them as ./etc/appliance.info - the leading ./ is important as that is the way it has been archived.
A concatenation of all such appliance.info files separated by atleast 1 newline each along with Location and md5sum lines and removal of the Architecture, Installed-Size and Source lines is what essentially makes up the content of the /var/lib/pve-manager/apl-info/apl-available file (in PVE v1.x, the apl-info folder is not present and hence removed from the path listed here).
Linux file extraction from tar.gz archive
The following will serve as a tutorial on linux tar file creation and selective extraction and concatenation. If we were to use real templates which are big, they would take a long time to extract and concatenate and hence this dummy file set example.
Create some files
First we create a folder and place two files in it with different content:
mkdir files
cat << EOF > files/file1.txt
This is file 1 in archive 1
This is line 2 of file 1 in archive 1
EOF
sed -e 's/file 1/file 2/g' files/file1.txt > files/file2.txt
Archive the files
We now archive this folder with both it's files:
tar -czf archive1.tar.gz files
Create a second archive with different files
sed -e 's/archive 1/archive 2/g' -i files/file1.txt
sed -e 's/archive 1/archive 2/g' -i files/file2.txt
tar -czf archive2.tar.gz files
rm -rf files