RFE: allow repoRequires to fetch from a different git repo

[jbastian]

The repoRequires field in the metadata file allows a task to fetch other tasks as dependencies from the same git repo. Please extend this to allow fetching dependencies from other git repos. Some examples:

repoRequires=git://git.example.com/users/jbastian/kernel-include.git#include
repoRequires=https://github.com/jbastian/jbastian-test-include/archive/master.zip#include

The second example is a test case which can be used for this RFE. The main task and the include dependency:

https://github.com/jbastian/jbastian-test/blob/master/misc/external-include/metadata

https://github.com/jbastian/jbastian-test-include/blob/master/include/include.sh

restraint-0.2.3 reports this error in harness.log when trying to run the task:

** Installing dependencies
** ERROR: Nothing was extracted from archive

If using the first style git:// URL, the harness.log reports this error instead:

** Installing dependencies
** ERROR: archive_read_open failed: Error from remote service: fatal: Not a valid object name

[danrodrig]

In case of implementing this, I would suggest to make the dependency task available in a way that avoids the need of absolute imports like this one,

. /mnt/tests/git.engineering.redhat.com/users/jbastian/kernel-include.git/include/include.sh

There was some work done do move task location away from /mnt/tests, and overall, we don't want tasks to relay on any specific location.

Either the task is placed in a way that can be imported through a relative import,

. ../include/include.sh

Or the task location is exposed through an environment variable,

. ${TASK_LOCATION}/git.engineering.redhat.com/users/jbastian/kernel-include.git/include/include.sh

[tcler]

We really need this feature, many of our user-space test cases dependent one or more kernel/Library/lib case.
If the original beaker-task rpm repo is disabled and Restraint->repoRequires does not support fetch test-case from different repos { these test cases will all run fail }

[tcler]

Hello folks. JFYI: Just implemented this feature in the Restraint plugin, if there are formats like:
library(pkg/libname), test(/task/name), kernel-kernel-* or just /task/name after Makefile->RthsRequires:
or
/task/name after metadata->orepoRequires=
the plugin will get the url of these tasks and extract to /mnt/tests/ and will add symlink to current task's repo dir if they are in same repo.

source code of 27_task_require