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populate is a program of its own, with a Nix library, in pkgs/populate,
which krops uses, and which doesn't use krops:
- default.nix builds the program, with nix-build there or callPackage,
as pkgs.populate-unwrapped.
- lib is populate's Nix library: the types of sources and the POSIX
types they use, evalSource, flakeFollows, hasGeneratedFlake, and
derivesFlake, taking nixpkgs' lib. krops' lib takes them from there,
so it provides them as before, and so does lib/types.
pkgs.populate, the function from populate's arguments to a script
running the program, is krops' own, in pkgs/krops/populate.nix, with
checks.nix next to it. It takes the program as populate-unwrapped,
which callPackage passes from the overlay; the flake, whose nixpkgs
lacks it, passes its own.
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Names and paths with characters that mean something to shells, to find,
or in URLs get handled as what they are, or refused:
- Pruning, and removing state that sources don't need anymore, list
entries with find instead of a loop reading names, which strips blanks
at the ends of names and splits names at newlines. So an entry named
"trail " gets pruned instead of reported as pruned and left.
- Pruning doesn't make entries writable before removing them, which
would change the mode of files elsewhere that are hard links to files
therein.
- Source names are portable file names: letters, digits, and ._-, not
starting with -. nixpkgs' writers accept nothing else in the names of
the scripts populating the sources, which contain the source names, and
fail with an assertion that doesn't mention the source.
- Paths get percent-encoded where they go into URLs for Nix, which
refuses blanks there and takes ? and # for delimiters.
- rsync gets the target path protected from the target's shell
(--protect-args), which expands wildcards in it otherwise: a file source
delivered to /var/src/a?c ends up in /var/src/abc if that exists.
A safety scenario deploys every kind of state to a target path with a
blank, wildcards, #, and %. An edge case prunes entries with blanks at
the ends of their names, with a newline, and with wildcards, and the
scenario pruning links also prunes hard links to a read-only file
outside, and lists what's left in the C locale, where ls sorts .populate
first. The scenario with unusual source names also draws inputs from a
source named self.
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Sources drawing inputs from other sources get the lock file of their
flake rewritten with nix flake lock --override-input, so the flake in
the source itself uses the other sources, and needs no generated flake
to be found. file and git sources get their lock file rewritten in
place. flake and flake-input sources get delivered as a copy with the
rewritten lock file, which gets added to the store with nix-store
--add-fixed, and the target path links to that. With rewriteLock set
to false, and for symlink sources, the source stays as it is and gets
a generated flake in .populate/flakes/<name>, which writeDeploy's flake
parameter uses.
flake and flake-input sources get two more options:
- patches: patches on the deploying machine, which get uploaded to
.populate/patches/<name> and applied in order with patch -p1 on the
target, in the directory the target path shows.
- materialize: the target path becomes a writable copy instead of a
link into the store.
Sources that get patched, rewritten, or materialized get delivered to
.populate/derived/<name>/original, which also roots the delivered store
path, and the flakes step derives the target path from there. Copies
get made again only if what they derive from changes, which a key in
.populate/derived/<name> records.
The matrices of the file, flake, flake-input, and git tests cover both
ways of drawing inputs, those of flake and flake-input materialize, the
deploy test a source with a rewritten lock file, and features and
edge cases run the scenarios drawing inputs both ways. New features
cover patches, a patch that doesn't apply, patches in a subdirectory,
reusing copies, and materializing.
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flakeFollows lists the inputs a source draws from other sources, with the
paths of nested inputs flattened.
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Shell code that enables flakes for the Nix commands following it, and fails
with an error message naming the host and the Nix version found, unless Nix
supports flakes.
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This is the expected behavior.
The SSH config is also implicitly used for other SSH-related settings.
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This fixes an issue when trying to deploy using sudo from systems that
don't provide means to determine the real host name.
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Let ssh use the user configured in its configuration files when the
target user is set to the empty string.
Closes https://github.com/krebs/krops/issues/2
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This allows deployment of remote hosts without having ssh access to the
root user. Passwordless sudo is recommended since krops will use
multiple ssh sessions and the password will not be remembered.
Closes https://github.com/krebs/krops/issues/3
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https://cgit.krebsco.de/stockholm 877b4104370c1ea9698a449e376e2842d7c372fd
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