Database should not be exposed to external. We should use repository most of
time.

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

This command allow to display/edit the MOTD for a local repository

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

The command 'upgrade_db' create a dummy repository (to the current version) and
add each images/payloads from the repository to upgrade. Symlinks are used to
avoid copy. Old database is still available in repository as db.bak.

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Old repository are still usable.
Database changes:
Add is_min_version and image_format in image table.
Add repository table which contain database uuid, version and motd.

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Image version now accept a string of digit separated by dots and extra char as
a qualifier (~ or +).

Example:
1.2.3.4~dev < 1.2.3.4 < 1.2.3.4+dev

Old repositories are still compatible thanks to sqlite type affinity
(https://www.sqlite.org/faq.html#q3

).

We use a package version comparison algorithm for image version comparison
inspired by Debian.

Seblu: Fix typos

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

New pattern is: [repository/][image][:version] (image is now optional).
Allow to select images in repository without globbing: 'is list repository/'
now work as 'is list repository/*'.
Same for version, for example: 'is list :*dev' work as 'is list */*:*dev'.

Seblu: Fix few explicit comparaison

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

ISException is an Installsystems exception which can handle an exception and
his information (type, value, traceback).

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

With the permission of Romain Degez, CTO of Smartjog and Sébastien Luttringer.

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

If we have to format (aka interpolatation) we need to be sure this have to be
done in unicode and not in ascii. This avoid unicode error with ascii string
encoded in utf-8.

Example of failure between a string and an object

b = Exception(u"é")
Exception("error: %s" % b)
 => Exception("error: %s" % str(b)
 => UnicodeEncodeError: 'ascii' codec can't encode character u'\xe9' in position 0: ordinal not in range(128)

Before this, timeout only apply to repository caching.

Now timeout is used by all transfert functions.
A new parameter repo_timeout is available to set a custom timeout on repository

min and max is no more handled by select_images

All command now use select_image in repoman to select which image should be
select for use

search is now added to repoman and not by command

best option was dropped for all command

changelog command take now more than one image
diff command is no more limited to 2 args. Can be one with globbing
list -a is dropped, use *:* instead (this can be used in all command)

is command allow smart image selection like this:

- ftp/* => list all image in repo ftp
- ftp/*:4 => list all image in version 4 in repo ftp
- *:4 => list all images at version 4 in search path
- */*:4 => list all images at version in all repo
- debian => list all images nammed debian in search path
- debian* => list all images starting by debian in search path

execute clean command without asking confirmation

this commit also make cachify more exception safe

repo command can now purge cache of database