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Looking for .rsync-filter files that apply to a file source, a failing
find counted as finding none, and only happened with rsync 3.5.0 and
later. Like in the shell implementation, find runs before each
transfer with filter files, and its failure stops populate with find's
message, e.g. for a source that's missing, or contains a directory find
can't read, which would also have switched off the check of
insecureLinks. A signal during find takes effect right after it.
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The program delivers derivation, file, git, pass, passage, pipe, and
symlink sources, makes backups, and prunes, as the shell implementation
does, with the same messages. Commands on the target are fixed shell
snippets in src/sh.rs, which get values as positional parameters, run
directly for local targets and over ssh, sharing one master connection,
for remote ones. rsync's transfers and its check for .rsync-filter files
it can't read are in src/rsync.rs. Given flake or flake-input sources, or
sources drawing inputs from others, the program fails before changing
anything, saying that these aren't implemented yet.
SIGHUP, SIGINT, and SIGTERM make populate stop once the command it waits
for ends, stop the ssh master, remove its temporary directory, and exit
with 128 plus the signal's number.
The spec's target gets local, which rust.nix sets during evaluation, like
the other functions of krops decide, and which the program decides when
it runs if it's null. The spec comes on file descriptor 3, so the
commands populate runs keep standard input, and the tools populate runs
come first in PATH.
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