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Build fails as:
$ make
CXX src/libmain/stack.o
src/libmain/stack.cc: In function 'void nix::sigsegvHandler(int, siginfo_t*, void*)':
src/libmain/stack.cc:21:21: error: 'ucontext' was not declared in this scope
sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
^~~~~~~~
src/libmain/stack.cc:21:21: note: suggested alternative: 'ucontext_t'
sp = (char *) ((ucontext *) ctx)->uc_mcontext.gregs[REG_RSP];
^~~~~~~~
ucontext_t
It's caused by upstream rename:
https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=251287734e89a52da3db682a8241eb6bccc050c9
which basically changes
typedef struct ucontext {} ucontext_t;
to
typedef struct ucontext_t {} ucontext_t;
The change uses ucontext_t.
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
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Without this, substitute info is fetched sequentially, which is
superslow. In the old UI (e.g. nix-build), we call printMissing(),
which calls queryMissing(), thereby preheating the binary cache
cache. But the new UI doesn't do that.
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In particular, drop the "build-" and "gc-" prefixes which are
pointless. So now you can say
nix build --no-sandbox
instead of
nix build --no-build-use-sandbox
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https://hydra.nixos.org/build/59649086
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https://hydra.nixos.org/build/59649086
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This is useful for testing commands in isolation.
For example,
$ nix run nixpkgs.geeqie -i -k DISPLAY -k XAUTHORITY -c geeqie
runs geeqie in an empty environment, except for $DISPLAY and
$XAUTHORITY.
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E.g.
nix run nixpkgs.hello -c hello --greeting Hallo
Note that unlike "nix-shell --command", no quoting of arguments is
necessary.
"-c" (short for "--command") cannot be combined with "--" because they
both consume all remaining arguments. But since installables shouldn't
start with a dash, this is unlikely to cause problems.
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Running "nix run" with a diverted store, e.g.
$ nix run --store local?root=/tmp/nix nixpkgs.hello
stopped working when Nix became multithreaded, because
unshare(CLONE_NEWUSER) doesn't work in multithreaded processes. The
obvious solution is to terminate all other threads first, but 1) there
is no way to terminate Boehm GC marker threads; and 2) it appears that
the kernel has a race where unshare(CLONE_NEWUSER) will still fail for
some indeterminate amount of time after joining other threads.
So instead, "nix run" will now exec() a single-threaded helper ("nix
__run_in_chroot") that performs the actual unshare()/chroot()/exec().
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These are assumed to be internal.
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Symlinks like /proc/self/exe report a stat() size of 0, so use a
buffer of at least PATH_MAX instead.
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And print them (separately from the progress bar) given sufficient -v
flags.
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This makes the progress bar work for non-root users.
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Now that we use threads in lots of places, it's possible for
TunnelLogger::log() to be called asynchronously from other threads
than the main loop. So we need to ensure that STDERR_NEXT messages
don't clobber other messages.
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So the progress bar can show
[1/0/1 built, 0.0 MiB DL] building hello-2.10 (configuring): checking whether pread is declared without a macro... yes
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In particular, this allows more relevant activities ("substituting X")
to supersede inferior ones ("downloading X").
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https://hydra.nixos.org/build/59390148
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This allows the progress bar to display "building perl-5.22.3" instead
of "building /nix/store/<hash>-perl-5.22.3.drv".
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Actually, currently they can only create download activities. Thus,
downloads by builtins.fetchurl show up in the progress bar.
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Besides being unused, this function has a bug that it will incorrectly
decode the path component Ubuntu\04016.04.2\040LTS\040amd64 as
"Ubuntu.04.2 LTS amd64" instead of "Ubuntu 16.04.2 LTS amd64".
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This replaces "nix-store --optimise". Main difference is that it has a
progress indicator.
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They're the same thing after all.
Example:
$ nix build --store local?root=/tmp/nix nixpkgs.firefox-unwrapped
[0/1 built, 49/98 copied, 16.3/92.8 MiB DL, 55.8/309.2 MiB copied] downloading 'https://cache.nixos.org/nar/0pl9li1jigcj2dany47hpmn0r3r48wc4nz48v5mqhh426lgz3bz6.nar.xz'
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E.g.
$ nix build --store local?root=/tmp/nix nixpkgs.firefox-unwrapped
[0/1 built, 1/97/98 fetched, 65.8/92.8 MiB DL, 203.2/309.2 MiB copied] downloading 'https://cache.nixos.org/nar/1czm9fk0svacy4h6a3fzkpafi4f7a9gml36kk8cq1igaghbspg3k.nar.xz'
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It now shows the amount of data copied:
[8/1038 copied, 160.4/1590.9 MiB copied] copying path '...'
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The function 'builtins.split' takes a POSIX extended regular expression
and an arbitrary string. It returns a list of non-matching substring
interleaved by lists of matched groups of the regular expression.
```nix
with builtins;
assert split "(a)b" "abc" == [ "" [ "a" ] "c" ];
assert split "([ac])" "abc" == [ "" [ "a" ] "b" [ "c" ] "" ];
assert split "(a)|(c)" "abc" == [ "" [ "a" null ] "b" [ null "c" ] "" ];
assert split "([[:upper:]]+)" " FOO "
== [ " " [ "FOO" ] " " ];
```
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Issue #1506.
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