diskimage-builder/diskimage_builder/elements/cache-url/README.rst

=========
cache-url
=========

A helper script to download images into a local cache.

**NOTE** : on RedHat platforms, ensure the curl binary is available.
Due to conflicting differences in platform usage of ```curl-minimal``
and ```curl``, the usual package dependency methods do not work for
this package.
Create docs site containing element READMEs We currently do not have the ability to create a docs site which outlines all the elements. Change-Id: I77ccf61e0c4b1509b3e7ce9b8f15ea5ccfd50d9b 2015-02-07 10:30:02 +00:00			`=========`
			`cache-url`
			`=========`
cache-url: Give up on curl install for Redhat platforms The RedHat platforms vary if they come pre-installed with curl or curl-minimal. For example, Fedora 37 container images have curl, and centos 9-stream and Rocky images have curl-minimal. If you try and install curl when curl-minimal is installed, you get an error, and vice-versa. Unfortunately package-installs can't really sort this out; we're just passing a package list to the system package manager. We don't have a way to say "the curl OR curl-minimal package is fine". As this breaks builds and is such a common dependency that it's already there, let's just add a note that curl is required and blank out the package-map. Change-Id: I9ccebe2dbf3a8682dab60c2070c5f78849e01446 2023-01-20 05:04:27 +00:00
Re-use cache_url() in fedora element. The fedora element downloads images too, so we should re-use the caching code from the ubuntu element. There doesn't seem to be other examples of code shared between root.d scripts. In the fedora and dpkg elements we copy install-packages into the chroot, but that model doesn't apply when we're running scripts outside of the chroot. Seems sane to just run it directly from the bin/ dir in the temporary hooks directory. Change-Id: Iaa6aca660042fea323cab4271633a4bdbbc271b8 2013-06-17 15:26:02 +00:00			`A helper script to download images into a local cache.`
cache-url: Give up on curl install for Redhat platforms The RedHat platforms vary if they come pre-installed with curl or curl-minimal. For example, Fedora 37 container images have curl, and centos 9-stream and Rocky images have curl-minimal. If you try and install curl when curl-minimal is installed, you get an error, and vice-versa. Unfortunately package-installs can't really sort this out; we're just passing a package list to the system package manager. We don't have a way to say "the curl OR curl-minimal package is fine". As this breaks builds and is such a common dependency that it's already there, let's just add a note that curl is required and blank out the package-map. Change-Id: I9ccebe2dbf3a8682dab60c2070c5f78849e01446 2023-01-20 05:04:27 +00:00
			`NOTE : on RedHat platforms, ensure the curl binary is available.`
			Due to conflicting differences in platform usage of ```curl-minimal``
			and ```curl``, the usual package dependency methods do not work for
			`this package.`