Eelco Dolstra 0abb3ad537 Allow content-addressable paths to have references ... This adds a command 'nix make-content-addressable' that rewrites the specified store paths into content-addressable paths. The advantage of such paths is that 1) they can be imported without signatures; 2) they can enable deduplication in cases where derivation changes do not cause output changes (apart from store path hashes). For example, $ nix make-content-addressable -r nixpkgs.cowsay rewrote '/nix/store/g1g31ah55xdia1jdqabv1imf6mcw0nb1-glibc-2.25-49' to '/nix/store/48jfj7bg78a8n4f2nhg269rgw1936vj4-glibc-2.25-49' ... rewrote '/nix/store/qbi6rzpk0bxjw8lw6azn2mc7ynnn455q-cowsay-3.03+dfsg1-16' to '/nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16' We can then copy the resulting closure to another store without signatures: $ nix copy --trusted-public-keys '' ---to ~/my-nix /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 In order to support self-references in content-addressable paths, these paths are hashed "modulo" self-references, meaning that self-references are zeroed out during hashing. Somewhat annoyingly, this means that the NAR hash stored in the Nix database is no longer necessarily equal to the output of "nix hash-path"; for content-addressable paths, you need to pass the --modulo flag: $ nix path-info --json /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 | jq -r .[].narHash sha256:0ri611gdilz2c9rsibqhsipbfs9vwcqvs811a52i2bnkhv7w9mgw $ nix hash-path --type sha256 --base32 /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 1ggznh07khq0hz6id09pqws3a8q9pn03ya3c03nwck1kwq8rclzs $ nix hash-path --type sha256 --base32 /nix/store/iq6g2x4q62xp7y7493bibx0qn5w7xz67-cowsay-3.03+dfsg1-16 --modulo iq6g2x4q62xp7y7493bibx0qn5w7xz67 0ri611gdilz2c9rsibqhsipbfs9vwcqvs811a52i2bnkhv7w9mgw		2019-10-21 17:47:24 +02:00
..
build-remote	canBuildLocally: check for features	2019-03-06 05:03:25 +00:00
cpptoml	bump cpptoml to v0.1.1	2019-05-29 17:01:39 +08:00
libexpr	Fix Bison 2.4 warning	2019-10-09 22:57:37 +02:00
libmain	Disable OpenSSL lock callback on OpenSSL >= 1.1.1	2019-09-04 21:45:01 +02:00
libstore	Allow content-addressable paths to have references	2019-10-21 17:47:24 +02:00
libutil	Allow content-addressable paths to have references	2019-10-21 17:47:24 +02:00
nix	Allow content-addressable paths to have references	2019-10-21 17:47:24 +02:00
nix-build	nix-build: Fix compilation	2019-10-09 14:46:44 +02:00
nix-channel	nix-env: Create ~/.nix-profile automatically	2019-10-09 23:35:01 +02:00
nix-collect-garbage	Merge all nix-* binaries into nix	2018-10-26 12:54:00 +02:00
nix-copy-closure	Merge all nix-* binaries into nix	2018-10-26 12:54:00 +02:00
nix-daemon	Remove world-writability from per-user directories	2019-10-09 23:34:48 +02:00
nix-env	nix-env: Ignore failures creating ~/.nix-profile and ~/.nix-defexpr	2019-10-10 09:14:05 +02:00
nix-instantiate	Merge all nix-* binaries into nix	2018-10-26 12:54:00 +02:00
nix-prefetch-url	nix-prefetch-url: Stop progress bar before printing results	2018-11-09 10:34:12 +01:00
nix-store	OCD performance fix: {find,count}+insert => insert	2019-10-09 16:06:29 +02:00
nlohmann	nlohmann-json: 3.4.0 -> 3.5.0	2018-12-21 22:38:06 -06:00
resolve-system-dependencies	OCD performance fix: {find,count}+insert => insert	2019-10-09 16:06:29 +02:00