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Improve and optimise pacman package installation

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Previously, packages were installed one at a time in a loop. This caused
a couple of problems.

First, it was a performance issue - pacman would have to perform all of
its checks once per package. This is unnecessarily costly, especially
when you're trying to install several related packages at the same time.

Second, if a package you're trying to install depends on a virtual
package that is provided by several different packages (such as the
"libgl" package on Arch) and you aren't also installing something that
provides that virtual package at the same time, pacman will produce an
interactive prompt to allow the user to select a relevant package. This
is obviously incompatible with how ansible operates. Yes, this problem
could be avoided by installing packages in a different order, but the
order of installation shouldn't matter, and there may be situations
where it is not possible to control the order of installation.

With this refactoring, all of the above problems are avoided. The code
will now work out all of the packages that need to be installed from any
configured repositories and any packages that need to be installed from
local files, and then install all the repository packages in one go and
then all of the local file packages in one go.
This commit is contained in:
Matthew Gamble 2016-12-19 17:05:17 +11:00 committed by Brian Coca
parent 93cfe73a76
commit f24ab68f04
1 changed files with 16 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
lib/ansible/modules/packaging/os/pacman.py
View file

@ -243,6 +243,8 @@ def install_packages(module, pacman_path, state, packages, package_files):
package_err = []
message = ""
to_install_repos = []
to_install_files = []
for i, package in enumerate(packages):
# if the package is installed and state == present or state == latest and is up-to-date then skip
installed, updated, latestError = query_package(module, pacman_path, package)
@ -253,17 +255,26 @@ def install_packages(module, pacman_path, state, packages, package_files):
continue
if package_files[i]:
params = '-U %s' % package_files[i]
to_install_files.append(package_files[i])
else:
params = '-S %s' % package
to_install_repos.append(package)
cmd = "%s %s --noconfirm --needed" % (pacman_path, params)
if to_install_repos:
cmd = "%s -S %s --noconfirm --needed" % (pacman_path, " ".join(to_install_repos))
rc, stdout, stderr = module.run_command(cmd, check_rc=False)
if rc != 0:
module.fail_json(msg="failed to install %s" % (package))
module.fail_json(msg="failed to install %s: %s" % (" ".join(to_install_repos), stderr))
install_c += 1
install_c += len(to_install_repos)
if to_install_files:
cmd = "%s -U %s --noconfirm --needed" % (pacman_path, " ".join(to_install_files))
rc, stdout, stderr = module.run_command(cmd, check_rc=False)
if rc != 0:
module.fail_json(msg="failed to install %s: %s" % (" ".join(to_install_files), stderr))
install_c += len(to_install_files)
if state == 'latest' and len(package_err) > 0:
message = "But could not ensure 'latest' state for %s package(s) as remote version could not be fetched." % (package_err)