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Allow for locks to be inherited. Inheriting the lock is something that
mkarchroot could do previously, but has since lost the ability to do. This
allows for the programs to be more compos-able.
Do this by instead of unconditionally opening $file on $fd, first check if
$file is already open on $fd; and go ahead use it if it is.
The naive way of doing this would be to `$(readlink /dev/fd/$fd)` and
compare that to `$file`. However, if `$file` is itself a symlink; or there
is a symlink somewhere in the path to `$file`, then this could easily fail.
Instead, check `[[ "/dev/fd/$fd" -ef "$file" ]]`. Even though the Bash
documentation (`help test`) says that `-ef` checks for if the two files are
hard links to eachother, because it uses stat(3) (which resolves symlinks)
to do this check, it also works with the /dev/fd/ soft links.
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`lock_close FD` is easier to remember than 'exec FD>&-`; and is especially
easier if FD is a variable (though that isn't actually taken advantage of
here).
This uses Bash 4.1+ `exec {var}>&-`, rather than the clunkier
`eval exec "$var>&-"` that was necessary in older versions of Bash.
Thanks to Dave Reisner for pointing this new bit of syntax out to me
the last time I submitted this (back in 2014, 4.1 had just come out).
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The systemd package creates a subvolume at /var/lib/machines (through
tmpfiles), if it can. We need to delete this subvolume before we can
delete the parent subvolume.
Look through the root for inodes with the number 256. These identify
subvolume roots.
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Move the function and save the orig_argv right along it.
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makepkg --asroot was removed with pacman 4.2. Allow to specify a
separate makepkg user from the command line instead.
Fixes FS#43432
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The way in which makechrootpkg reads variables from makepkg.conf(5) is
different from makepkg, in that it reads a subset of defined
variables, and only if the were not set in the environment before.
Mention this in the usage text.
Fixes FS#44827
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This removes the preservation of HOME being /build just for the pacman
sudo call. Former leads to unbuildable packages when an to be installed
dependency writes something into the HOME dir (f.e. .config). The
resulting directories won't be writable by the builduser as they are
owned by root:root and ultimately will fail to build anything that
requires so.
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This is essentially merging the "archlinux" (upstream) branch. The
"lukeshu/ng" branch is all of the changes on the "lukeshu/libretools"
branch rebased on to "archlinux".
I did this instead of a simple merge so that I wouldn't have to worry
about the "big picture" when resolving conflicts; with rebasing I could
look at each atomic change.
Notable conflicts:
- "makechrootpkg: _chrootprepare: Clean srcdest and startdir."
I totally dropped this commit.
The surrounding code was removed in upsteam commit ca819a235791
("makechrootpkg: Simplify chroot preparation (v2)").
The change originated in libretools commit 564a4cfa06a8, but my
commit message doesn't give any insight as to why I made that change.
I've also scanned the issue tracker, and found no hints.
So dropping this is a little scary; I don't know why I thought it was
important in the first place.
- "makechrootpkg, arch-nspawn: Force-enable local '/repo/' repository."
I moved the code that force-updates `/var/lib/pacman/sync/repo.db
from _chrootprepare() into prepare_chroot().
Other than that, conflicts were mostly just the context changing.
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The 'lukeshu/libretools' branch is is all of the .patch files (and
some edit scripts) from libretools.git being applied. The
'lukeshu/libretools-to-upstream' branch is all of these changes broken
apart into atomic commits (i.e., suitable to be sent upstream).
That is; they are two different patch-sets to get to the same tree.
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This means wrapping variable initialization in init_variables(), and the
main program routine in main().
I did NOT put `shopt -s nullglob` in to a function.
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Even though main() doesn't call `set -u`; this way the functions will
continue to work if copied into an environment with `set -u`, or so
that we are ready if we ever want to start using `set -u`.
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The change in arch-nspawn is subtle:
This was the source of "infamous" "it fails every other time" bug that
took me over a year to solve. <https://labs.parabola.nu/issues/435>
By having a repository of local packages (rather than simply running
`pacman -U`), we are inviting pacman to cache them in
`/var/cache/pacman/pkg`. Besides being needless disk writes, this
actually causes a real issue. If the package gets rebuilt, pacman
will balk, as the file no longer matches the cached signature.
So, how do we prevent pacman from caching these local packages?
Simple: include the directory they are already in in the
pacman.conf:CacheDir list. This will prevent pacman from copying
the files to one of the other cache directories.
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Rather than them simply being named blocks of code with braces around
them.
That is: have them take things via arguments rather than global
variables.
Specific notes:
- download_sources:
Observation: if $SUDO_USER is set, then src_owner=$SUDO_USER.
So (for clarity), rather than checking if $SUDO_USER is set, check
if $src_owner is different than $USER.
This reduces how much we have to worry about global state.
- install_packages:
1. Receive the list of packages as arguments, rather than a global
variable.
2. Make the caller responsible for looking at PKGBUILD. From the
name and arguments, one would never expect it to look at PKGBUILD.
- create_chroot->sync_chroot:
I pulled the `if [[ ! -d $copydir ]] || $clean_first;` check out; it is
now the caller's responsibility to use that check when deciding if to
call sync_chroot.
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A previous iteration of this change (libretools commit d7dcce53396d)
simply inserted `env -i` to clear the environment.
However, that lead to it ignoring proxy settings, which some users had
problems with:
https://labs.parabola.nu/issues/487:
> To fix other bugs, the pacstrap environment is blank, which also
> means that the proxy settings are blank.
So (in libretools commit d17d1d82349f), I changed it to use `declare
-x` to inspect the environment, and create a version of it only
consisting of variables ending with "_proxy" (case-insensitive).
I honestly don't remember what "other bugs" prompted me to clear the
environment in the first place.
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This allows us to run an ARM chroot on an x86 box; as the binfmt
runner will set the architecture for us, and the x86
`/usr/bin/setarch` program won't know about the ARM architecture
string.
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This allows us to copy in files like `qemu-arm-static`, which is
necessary for running an ARM chroot on an x86 box.
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This is similar to common C #ifdef guards.
I was tempted to wrap the entire thing in the if/fi (rather than use
'return' to bail early. However, that means it won't execute anything
until after it reaches 'fi'. And if `shopt -s extglob` isn't executed
before parsing, then it will syntax-error on the extended globs. One
solution would have been to move `shopt -s extglob` up above the
include-guard. But the committed solution is all-around simpler.
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for now)
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In order to have an UTF-8 locale in the build root. This is something
normally set on real machines but is not set from our chroots. Meson,
for example, loudly complains when the locale charset is not UTF-8.
I'd like to have C.UTF-8, as most other distributions do. Unfortunately,
it's not part of vanilla glibc; en_US.UTF-8 will have to do.
mkarchroot already creates roots with both en_US.UTF-8 and de_DE.UTF-8,
the latter because builds of gcc (perhaps used to) require it.
Bump the CHROOT_VERSION due to the setting change.
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Motivation:
tmpfiles.d(5) has directives to create btrfs subvolumes. This means
that systemd-tmpfiles (which may be called by an ALPM hook) might
create subvolumes. For instance, systemd's systemd-nspawn.conf
creates a subvolume at `/var/lib/machines/`.
This causes a problem when we go to delete the chroot. The command
`btrfs subvolume delete` won't recursively delete subvolumes; if a
child subvolume was created, it will fail with the fairly unhelpful
error message "directory not empty".
Solution:
Because the subvolume that gets mounted isn't necessarily the
toplevel subvolume, and `btrfs subvolume list` gives us paths
relative to the toplevel; we need to figure out how our path relates
to the toplevel. Figure out the mountpoint (which turns out to be
slightly tricky; see below), and call `btrfs subvolume list -a` on
it to get the list of subvolumes that are visible to us (and quite
possibly some that aren't; the logic for determining which ones it
shows is... absurd). This gives us a list of subvolumes with
numeric IDs, and paths relative to the toplevel (actually it gives
us more than that, and we use a hopefully-correct `sed` expression
to trim it down) So then we look at that list of pairs and find the
one that matches the ID of the subvolume we're trying to delete
(which is easy to get with `btrfs subvolume show`); once we've found
the path of our subvolume, we can use that to filter and trim the
complete list of paths. From there the remainder of the solution is
obvious.
Now, back to "figure out the mountpoint"; the normal `stat -c %m`
doesn't work. It gives the mounted path of the subvolume closest to
the path we give it, not the actual mountpoint. Now, it turns out
that `df` can figure out the correct mountpoint (though I haven't
investigated how it knows when stat doesn't; but I suspect it parses
`/proc/mounts`). So we are reduced to parsing `df`'s output.
Now, back to "hopefully-correct `sed` expression"; the output of
`btrfs subvolume list -a` is a space-separated sequence of
"key value key value...". Unfortunately both keys and values can
contain space, and there's no escaping or indication of when this
happens. With how we choose to parse it, a path containing a space
is truncated at the first space. This means that at least the
prefix is correct; if a path gets mangled, it just means that the
deletion fails. As "path" is (currently) the last key, it seems
tempting to allow it to simply run until the end of the line.
However, this creates the possibility of a path containing " path ",
which would cause the *prefix* to be trimmed, which means our
failure case is now unpredictable, and potentially harmful. While
we pretty much trust the user, that's still scary.
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embedding.
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It was displaing the value of the `makepkg_args` variable, which may
have already been changed by the argument parsing by the time it gets
to `-h`. Now there is a separate `default_makepkg_args` variable.
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This involves extending the signature of lib/common.sh's `stat_busy()`,
`lock()`, and `slock()`. The `mesg=$1; shift` in stat_busy even suggests
that this is what was originally intended from it.
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It was confusing Emacs and screwing up the syntax highlighting and
auto-indentation for the rest of the file.
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