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In order to cache sources offline, makepkg creates *two* copies of every
git repo. This is a useful tradeoff for network time, but comes at the
cost of increased disk space.
Normally, git can smooth this over automagically. Whenever possible, git
objects are hardlinked to save space, but this does not work when
SRCDEST and BUILDDIR are on separate filesystems.
When the repo in question is both very large (linux.git for example is
2.2 GB) and crosses filesystem boundaries, this results in a lot of
extra disk space being used; the most likely scenario is where BUILDDIR
is a tmpfs for bonus ouch.
git(1) has a builtin feature which serves this case handily: the
--shared flag will create the info/alternates file instructing git to
not copy or hardlink or create objects/packs at all, but merely look for
them in an external location (that being the source of the clone).
The downside of using shared clones, is that if you modify and drop
commits from the original repo, or simply delete the whole repo
altogether, you break the copy. But we don't care about that here,
because
1) the BUILDDIR copy is meant to be a temporary copy strictly derived
via PKGBUILD syntax from the SRCDEST, and must be able to be
recreated at any time,
2) if the SRCDEST disappears, makepkg will redownload it, thus restoring
the objects needed by the BUILDDIR clone,
3) if the user does non-default things like hacking on the BUILDDIR copy
then deleting and re-cloning the SRCDEST may result in momentary
breakage, but ultimately should be fine -- the unique objects they
created will be stored in the BUILDDIR copy.
While it's theoretically possible that upstream will force-push to
overwrite the base tree from which makepkg is building (which they
should not do), *and* the user deleted their SRCDEST which they should
not do, *and* they saved work in makepkg's working directory which they
should not do either...
... this is an unlikely chain of events for which we should not care.
Using --shared is therefore helpful in immediately useful ways and IMHO
has no actual downsides; we should use it.
An alternative implementation would be to use worktrees. I've rejected
this since it is essentially the same as shared clones, except adding
additional restrictions on the branch namespace, and could potentially
break existing use cases such as manually handling the SRCDEST in order
to share repositories with normal working copies.
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>
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Lookup the existence of matching functions for each protocol, and
fallback on the generic file handler. New source protocols can then be
added via thirdparty libmakepkg drop-ins without requiring modifications
to source.sh
Fixes FS#49076
Signed-off-by: Allan McRae <allan@archlinux.org>
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make update-copyright OLD=2017 NEW=201
Signed-off-by: Allan McRae <allan@archlinux.org>
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As per https://lists.archlinux.org/pipermail/arch-general/2017-July/043876.html
git doesn't check that the tag name matches what an annotated tag object
*thinks* it should be called. This is a bit of a theoretical attack and
some would argue that we should always use commits since upstream can
legitimately change a tag, but nevertheless this can result in a
downgrade attack if the git download transport was manipulated or the
upstream repository hacked.
So, check the tag blob to make sure the tag actually matches the name we
used for `git checkout`.
This really should be fixed in git itself, rather than forcing all
downstream users of git verify-tag to implement their own checks, but
the git developers disagree, see the discussion surrounding
https://public-inbox.org/git/xmqqk2hzldx8.fsf@gitster.mtv.corp.google.com/
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>
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A git repository is marked as signed if it contains the query "signed"
as defined by https://tools.ietf.org/html/rfc3986
Adds two utility functions in util/source.sh.in to extract fragments and
queries, and modifies source/git.sh.in to use them.
Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>
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Signed-off-by: Allan McRae <allan@archlinux.org>
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make update-copyright OLD=2015 NEW=2016
Signed-off-by: Allan McRae <allan@archlinux.org>
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Signed-off-by: Allan McRae <allan@archlinux.org>
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