Merge branch 'master' into nix-repl-flakes

17 files changed, 499 insertions, 99 deletions

diff --git a/doc/manual/anchors.jq b/doc/manual/anchors.jq
new file mode 100755
index 000000000..72309779c
--- /dev/null
+++ b/doc/manual/anchors.jq
@@ -0,0 +1,31 @@
+"\\[\\]\\{#(?<anchor>[^\\}]+?)\\}" as $empty_anchor_regex |
+"\\[(?<text>[^\\]]+?)\\]\\{#(?<anchor>[^\\}]+?)\\}" as $anchor_regex |
+
+
+def transform_anchors_html:
+    . | gsub($empty_anchor_regex; "<a name=\"" + .anchor + "\"></a>")
+      | gsub($anchor_regex; "<a href=\"#" + .anchor + "\" id=\"" + .anchor + "\">" + .text + "</a>");
+
+
+def transform_anchors_strip:
+    . | gsub($empty_anchor_regex; "")
+      | gsub($anchor_regex; .text);
+
+
+def map_contents_recursively(transformer):
+    . + {
+        Chapter: (.Chapter + {
+            content: .Chapter.content | transformer,
+            sub_items: .Chapter.sub_items | map(map_contents_recursively(transformer)),
+        }),
+    };
+
+
+def process_command:
+    .[0] as $context |
+    .[1] as $body |
+    $body + {
+        sections: $body.sections | map(map_contents_recursively(if $context.renderer == "html" then transform_anchors_html else transform_anchors_strip end)),
+    };
+
+process_command
diff --git a/doc/manual/book.toml b/doc/manual/book.toml
index fee41dfb3..5f78a7614 100644
--- a/doc/manual/book.toml
+++ b/doc/manual/book.toml
@@ -1,2 +1,7 @@
 [output.html]
 additional-css = ["custom.css"]
+additional-js = ["redirects.js"]
+
+[preprocessor.anchors]
+renderers = ["html"]
+command = "jq --from-file doc/manual/anchors.jq"
diff --git a/doc/manual/local.mk b/doc/manual/local.mk
index c1ce8aaeb..371ed6f21 100644
--- a/doc/manual/local.mk
+++ b/doc/manual/local.mk
@@ -97,7 +97,7 @@ doc/manual/generated/man1/nix3-manpages: $(d)/src/command-ref/new-cli
 	done
 	@touch $@
 
-$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/command-ref/new-cli $(d)/src/command-ref/conf-file.md $(d)/src/expressions/builtins.md $(call rwildcard, $(d)/src, *.md)
+$(docdir)/manual/index.html: $(MANUAL_SRCS) $(d)/book.toml $(d)/anchors.jq $(d)/custom.css $(d)/src/SUMMARY.md $(d)/src/command-ref/new-cli $(d)/src/command-ref/conf-file.md $(d)/src/expressions/builtins.md $(call rwildcard, $(d)/src, *.md)
 	$(trace-gen) RUST_LOG=warn mdbook build doc/manual -d $(DESTDIR)$(docdir)/manual
 
 endif
diff --git a/doc/manual/redirects.js b/doc/manual/redirects.js
new file mode 100644
index 000000000..19f928c7e
--- /dev/null
+++ b/doc/manual/redirects.js
@@ -0,0 +1,337 @@
+// Redirects from old DocBook manual.
+var redirects = {
+  "#part-advanced-topics": "advanced-topics/advanced-topics.html",
+  "#chap-tuning-cores-and-jobs": "advanced-topics/cores-vs-jobs.html",
+  "#chap-diff-hook": "advanced-topics/diff-hook.html",
+  "#check-dirs-are-unregistered": "advanced-topics/diff-hook.html#check-dirs-are-unregistered",
+  "#chap-distributed-builds": "advanced-topics/distributed-builds.html",
+  "#chap-post-build-hook": "advanced-topics/post-build-hook.html",
+  "#chap-post-build-hook-caveats": "advanced-topics/post-build-hook.html#implementation-caveats",
+  "#part-command-ref": "command-ref/command-ref.html",
+  "#conf-allow-import-from-derivation": "command-ref/conf-file.html#conf-allow-import-from-derivation",
+  "#conf-allow-new-privileges": "command-ref/conf-file.html#conf-allow-new-privileges",
+  "#conf-allowed-uris": "command-ref/conf-file.html#conf-allowed-uris",
+  "#conf-allowed-users": "command-ref/conf-file.html#conf-allowed-users",
+  "#conf-auto-optimise-store": "command-ref/conf-file.html#conf-auto-optimise-store",
+  "#conf-binary-cache-public-keys": "command-ref/conf-file.html#conf-binary-cache-public-keys",
+  "#conf-binary-caches": "command-ref/conf-file.html#conf-binary-caches",
+  "#conf-build-compress-log": "command-ref/conf-file.html#conf-build-compress-log",
+  "#conf-build-cores": "command-ref/conf-file.html#conf-build-cores",
+  "#conf-build-extra-chroot-dirs": "command-ref/conf-file.html#conf-build-extra-chroot-dirs",
+  "#conf-build-extra-sandbox-paths": "command-ref/conf-file.html#conf-build-extra-sandbox-paths",
+  "#conf-build-fallback": "command-ref/conf-file.html#conf-build-fallback",
+  "#conf-build-max-jobs": "command-ref/conf-file.html#conf-build-max-jobs",
+  "#conf-build-max-log-size": "command-ref/conf-file.html#conf-build-max-log-size",
+  "#conf-build-max-silent-time": "command-ref/conf-file.html#conf-build-max-silent-time",
+  "#conf-build-repeat": "command-ref/conf-file.html#conf-build-repeat",
+  "#conf-build-timeout": "command-ref/conf-file.html#conf-build-timeout",
+  "#conf-build-use-chroot": "command-ref/conf-file.html#conf-build-use-chroot",
+  "#conf-build-use-sandbox": "command-ref/conf-file.html#conf-build-use-sandbox",
+  "#conf-build-use-substitutes": "command-ref/conf-file.html#conf-build-use-substitutes",
+  "#conf-build-users-group": "command-ref/conf-file.html#conf-build-users-group",
+  "#conf-builders": "command-ref/conf-file.html#conf-builders",
+  "#conf-builders-use-substitutes": "command-ref/conf-file.html#conf-builders-use-substitutes",
+  "#conf-compress-build-log": "command-ref/conf-file.html#conf-compress-build-log",
+  "#conf-connect-timeout": "command-ref/conf-file.html#conf-connect-timeout",
+  "#conf-cores": "command-ref/conf-file.html#conf-cores",
+  "#conf-diff-hook": "command-ref/conf-file.html#conf-diff-hook",
+  "#conf-enforce-determinism": "command-ref/conf-file.html#conf-enforce-determinism",
+  "#conf-env-keep-derivations": "command-ref/conf-file.html#conf-env-keep-derivations",
+  "#conf-extra-binary-caches": "command-ref/conf-file.html#conf-extra-binary-caches",
+  "#conf-extra-platforms": "command-ref/conf-file.html#conf-extra-platforms",
+  "#conf-extra-sandbox-paths": "command-ref/conf-file.html#conf-extra-sandbox-paths",
+  "#conf-extra-substituters": "command-ref/conf-file.html#conf-extra-substituters",
+  "#conf-fallback": "command-ref/conf-file.html#conf-fallback",
+  "#conf-fsync-metadata": "command-ref/conf-file.html#conf-fsync-metadata",
+  "#conf-gc-keep-derivations": "command-ref/conf-file.html#conf-gc-keep-derivations",
+  "#conf-gc-keep-outputs": "command-ref/conf-file.html#conf-gc-keep-outputs",
+  "#conf-hashed-mirrors": "command-ref/conf-file.html#conf-hashed-mirrors",
+  "#conf-http-connections": "command-ref/conf-file.html#conf-http-connections",
+  "#conf-keep-build-log": "command-ref/conf-file.html#conf-keep-build-log",
+  "#conf-keep-derivations": "command-ref/conf-file.html#conf-keep-derivations",
+  "#conf-keep-env-derivations": "command-ref/conf-file.html#conf-keep-env-derivations",
+  "#conf-keep-outputs": "command-ref/conf-file.html#conf-keep-outputs",
+  "#conf-max-build-log-size": "command-ref/conf-file.html#conf-max-build-log-size",
+  "#conf-max-free": "command-ref/conf-file.html#conf-max-free",
+  "#conf-max-jobs": "command-ref/conf-file.html#conf-max-jobs",
+  "#conf-max-silent-time": "command-ref/conf-file.html#conf-max-silent-time",
+  "#conf-min-free": "command-ref/conf-file.html#conf-min-free",
+  "#conf-narinfo-cache-negative-ttl": "command-ref/conf-file.html#conf-narinfo-cache-negative-ttl",
+  "#conf-narinfo-cache-positive-ttl": "command-ref/conf-file.html#conf-narinfo-cache-positive-ttl",
+  "#conf-netrc-file": "command-ref/conf-file.html#conf-netrc-file",
+  "#conf-plugin-files": "command-ref/conf-file.html#conf-plugin-files",
+  "#conf-post-build-hook": "command-ref/conf-file.html#conf-post-build-hook",
+  "#conf-pre-build-hook": "command-ref/conf-file.html#conf-pre-build-hook",
+  "#conf-repeat": "command-ref/conf-file.html#conf-repeat",
+  "#conf-require-sigs": "command-ref/conf-file.html#conf-require-sigs",
+  "#conf-restrict-eval": "command-ref/conf-file.html#conf-restrict-eval",
+  "#conf-run-diff-hook": "command-ref/conf-file.html#conf-run-diff-hook",
+  "#conf-sandbox": "command-ref/conf-file.html#conf-sandbox",
+  "#conf-sandbox-dev-shm-size": "command-ref/conf-file.html#conf-sandbox-dev-shm-size",
+  "#conf-sandbox-paths": "command-ref/conf-file.html#conf-sandbox-paths",
+  "#conf-secret-key-files": "command-ref/conf-file.html#conf-secret-key-files",
+  "#conf-show-trace": "command-ref/conf-file.html#conf-show-trace",
+  "#conf-stalled-download-timeout": "command-ref/conf-file.html#conf-stalled-download-timeout",
+  "#conf-substitute": "command-ref/conf-file.html#conf-substitute",
+  "#conf-substituters": "command-ref/conf-file.html#conf-substituters",
+  "#conf-system": "command-ref/conf-file.html#conf-system",
+  "#conf-system-features": "command-ref/conf-file.html#conf-system-features",
+  "#conf-tarball-ttl": "command-ref/conf-file.html#conf-tarball-ttl",
+  "#conf-timeout": "command-ref/conf-file.html#conf-timeout",
+  "#conf-trace-function-calls": "command-ref/conf-file.html#conf-trace-function-calls",
+  "#conf-trusted-binary-caches": "command-ref/conf-file.html#conf-trusted-binary-caches",
+  "#conf-trusted-public-keys": "command-ref/conf-file.html#conf-trusted-public-keys",
+  "#conf-trusted-substituters": "command-ref/conf-file.html#conf-trusted-substituters",
+  "#conf-trusted-users": "command-ref/conf-file.html#conf-trusted-users",
+  "#extra-sandbox-paths": "command-ref/conf-file.html#extra-sandbox-paths",
+  "#sec-conf-file": "command-ref/conf-file.html",
+  "#env-NIX_PATH": "command-ref/env-common.html#env-NIX_PATH",
+  "#env-common": "command-ref/env-common.html",
+  "#envar-remote": "command-ref/env-common.html#env-NIX_REMOTE",
+  "#sec-common-env": "command-ref/env-common.html",
+  "#ch-files": "command-ref/files.html",
+  "#ch-main-commands": "command-ref/main-commands.html",
+  "#opt-out-link": "command-ref/nix-build.html#opt-out-link",
+  "#sec-nix-build": "command-ref/nix-build.html",
+  "#sec-nix-channel": "command-ref/nix-channel.html",
+  "#sec-nix-collect-garbage": "command-ref/nix-collect-garbage.html",
+  "#sec-nix-copy-closure": "command-ref/nix-copy-closure.html",
+  "#sec-nix-daemon": "command-ref/nix-daemon.html",
+  "#refsec-nix-env-install-examples": "command-ref/nix-env.html#examples",
+  "#rsec-nix-env-install": "command-ref/nix-env.html#operation---install",
+  "#rsec-nix-env-set": "command-ref/nix-env.html#operation---set",
+  "#rsec-nix-env-set-flag": "command-ref/nix-env.html#operation---set-flag",
+  "#rsec-nix-env-upgrade": "command-ref/nix-env.html#operation---upgrade",
+  "#sec-nix-env": "command-ref/nix-env.html",
+  "#ssec-version-comparisons": "command-ref/nix-env.html#versions",
+  "#sec-nix-hash": "command-ref/nix-hash.html",
+  "#sec-nix-instantiate": "command-ref/nix-instantiate.html",
+  "#sec-nix-prefetch-url": "command-ref/nix-prefetch-url.html",
+  "#sec-nix-shell": "command-ref/nix-shell.html",
+  "#ssec-nix-shell-shebang": "command-ref/nix-shell.html#use-as-a--interpreter",
+  "#nixref-queries": "command-ref/nix-store.html#queries",
+  "#opt-add-root": "command-ref/nix-store.html#opt-add-root",
+  "#refsec-nix-store-dump": "command-ref/nix-store.html#operation---dump",
+  "#refsec-nix-store-export": "command-ref/nix-store.html#operation---export",
+  "#refsec-nix-store-import": "command-ref/nix-store.html#operation---import",
+  "#refsec-nix-store-query": "command-ref/nix-store.html#operation---query",
+  "#refsec-nix-store-verify": "command-ref/nix-store.html#operation---verify",
+  "#rsec-nix-store-gc": "command-ref/nix-store.html#operation---gc",
+  "#rsec-nix-store-generate-binary-cache-key": "command-ref/nix-store.html#operation---generate-binary-cache-key",
+  "#rsec-nix-store-realise": "command-ref/nix-store.html#operation---realise",
+  "#rsec-nix-store-serve": "command-ref/nix-store.html#operation---serve",
+  "#sec-nix-store": "command-ref/nix-store.html",
+  "#opt-I": "command-ref/opt-common.html#opt-I",
+  "#opt-attr": "command-ref/opt-common.html#opt-attr",
+  "#opt-common": "command-ref/opt-common.html",
+  "#opt-cores": "command-ref/opt-common.html#opt-cores",
+  "#opt-log-format": "command-ref/opt-common.html#opt-log-format",
+  "#opt-max-jobs": "command-ref/opt-common.html#opt-max-jobs",
+  "#opt-max-silent-time": "command-ref/opt-common.html#opt-max-silent-time",
+  "#opt-timeout": "command-ref/opt-common.html#opt-timeout",
+  "#sec-common-options": "command-ref/opt-common.html",
+  "#ch-utilities": "command-ref/utilities.html",
+  "#chap-hacking": "contributing/hacking.html",
+  "#adv-attr-allowSubstitutes": "expressions/advanced-attributes.html#adv-attr-allowSubstitutes",
+  "#adv-attr-allowedReferences": "expressions/advanced-attributes.html#adv-attr-allowedReferences",
+  "#adv-attr-allowedRequisites": "expressions/advanced-attributes.html#adv-attr-allowedRequisites",
+  "#adv-attr-disallowedReferences": "expressions/advanced-attributes.html#adv-attr-disallowedReferences",
+  "#adv-attr-disallowedRequisites": "expressions/advanced-attributes.html#adv-attr-disallowedRequisites",
+  "#adv-attr-exportReferencesGraph": "expressions/advanced-attributes.html#adv-attr-exportReferencesGraph",
+  "#adv-attr-impureEnvVars": "expressions/advanced-attributes.html#adv-attr-impureEnvVars",
+  "#adv-attr-outputHash": "expressions/advanced-attributes.html#adv-attr-outputHash",
+  "#adv-attr-outputHashAlgo": "expressions/advanced-attributes.html#adv-attr-outputHashAlgo",
+  "#adv-attr-outputHashMode": "expressions/advanced-attributes.html#adv-attr-outputHashMode",
+  "#adv-attr-passAsFile": "expressions/advanced-attributes.html#adv-attr-passAsFile",
+  "#adv-attr-preferLocalBuild": "expressions/advanced-attributes.html#adv-attr-preferLocalBuild",
+  "#fixed-output-drvs": "expressions/advanced-attributes.html#adv-attr-outputHash",
+  "#sec-advanced-attributes": "expressions/advanced-attributes.html",
+  "#sec-arguments": "expressions/arguments-variables.html",
+  "#sec-build-script": "expressions/build-script.html",
+  "#builtin-abort": "expressions/builtins.html#builtins-abort",
+  "#builtin-add": "expressions/builtins.html#builtins-add",
+  "#builtin-all": "expressions/builtins.html#builtins-all",
+  "#builtin-any": "expressions/builtins.html#builtins-any",
+  "#builtin-attrNames": "expressions/builtins.html#builtins-attrNames",
+  "#builtin-attrValues": "expressions/builtins.html#builtins-attrValues",
+  "#builtin-baseNameOf": "expressions/builtins.html#builtins-baseNameOf",
+  "#builtin-bitAnd": "expressions/builtins.html#builtins-bitAnd",
+  "#builtin-bitOr": "expressions/builtins.html#builtins-bitOr",
+  "#builtin-bitXor": "expressions/builtins.html#builtins-bitXor",
+  "#builtin-builtins": "expressions/builtins.html#builtins-builtins",
+  "#builtin-compareVersions": "expressions/builtins.html#builtins-compareVersions",
+  "#builtin-concatLists": "expressions/builtins.html#builtins-concatLists",
+  "#builtin-concatStringsSep": "expressions/builtins.html#builtins-concatStringsSep",
+  "#builtin-currentSystem": "expressions/builtins.html#builtins-currentSystem",
+  "#builtin-deepSeq": "expressions/builtins.html#builtins-deepSeq",
+  "#builtin-derivation": "expressions/builtins.html#builtins-derivation",
+  "#builtin-dirOf": "expressions/builtins.html#builtins-dirOf",
+  "#builtin-div": "expressions/builtins.html#builtins-div",
+  "#builtin-elem": "expressions/builtins.html#builtins-elem",
+  "#builtin-elemAt": "expressions/builtins.html#builtins-elemAt",
+  "#builtin-fetchGit": "expressions/builtins.html#builtins-fetchGit",
+  "#builtin-fetchTarball": "expressions/builtins.html#builtins-fetchTarball",
+  "#builtin-fetchurl": "expressions/builtins.html#builtins-fetchurl",
+  "#builtin-filterSource": "expressions/builtins.html#builtins-filterSource",
+  "#builtin-foldl-prime": "expressions/builtins.html#builtins-foldl-prime",
+  "#builtin-fromJSON": "expressions/builtins.html#builtins-fromJSON",
+  "#builtin-functionArgs": "expressions/builtins.html#builtins-functionArgs",
+  "#builtin-genList": "expressions/builtins.html#builtins-genList",
+  "#builtin-getAttr": "expressions/builtins.html#builtins-getAttr",
+  "#builtin-getEnv": "expressions/builtins.html#builtins-getEnv",
+  "#builtin-hasAttr": "expressions/builtins.html#builtins-hasAttr",
+  "#builtin-hashFile": "expressions/builtins.html#builtins-hashFile",
+  "#builtin-hashString": "expressions/builtins.html#builtins-hashString",
+  "#builtin-head": "expressions/builtins.html#builtins-head",
+  "#builtin-import": "expressions/builtins.html#builtins-import",
+  "#builtin-intersectAttrs": "expressions/builtins.html#builtins-intersectAttrs",
+  "#builtin-isAttrs": "expressions/builtins.html#builtins-isAttrs",
+  "#builtin-isBool": "expressions/builtins.html#builtins-isBool",
+  "#builtin-isFloat": "expressions/builtins.html#builtins-isFloat",
+  "#builtin-isFunction": "expressions/builtins.html#builtins-isFunction",
+  "#builtin-isInt": "expressions/builtins.html#builtins-isInt",
+  "#builtin-isList": "expressions/builtins.html#builtins-isList",
+  "#builtin-isNull": "expressions/builtins.html#builtins-isNull",
+  "#builtin-isString": "expressions/builtins.html#builtins-isString",
+  "#builtin-length": "expressions/builtins.html#builtins-length",
+  "#builtin-lessThan": "expressions/builtins.html#builtins-lessThan",
+  "#builtin-listToAttrs": "expressions/builtins.html#builtins-listToAttrs",
+  "#builtin-map": "expressions/builtins.html#builtins-map",
+  "#builtin-match": "expressions/builtins.html#builtins-match",
+  "#builtin-mul": "expressions/builtins.html#builtins-mul",
+  "#builtin-parseDrvName": "expressions/builtins.html#builtins-parseDrvName",
+  "#builtin-path": "expressions/builtins.html#builtins-path",
+  "#builtin-pathExists": "expressions/builtins.html#builtins-pathExists",
+  "#builtin-placeholder": "expressions/builtins.html#builtins-placeholder",
+  "#builtin-readDir": "expressions/builtins.html#builtins-readDir",
+  "#builtin-readFile": "expressions/builtins.html#builtins-readFile",
+  "#builtin-removeAttrs": "expressions/builtins.html#builtins-removeAttrs",
+  "#builtin-replaceStrings": "expressions/builtins.html#builtins-replaceStrings",
+  "#builtin-seq": "expressions/builtins.html#builtins-seq",
+  "#builtin-sort": "expressions/builtins.html#builtins-sort",
+  "#builtin-split": "expressions/builtins.html#builtins-split",
+  "#builtin-splitVersion": "expressions/builtins.html#builtins-splitVersion",
+  "#builtin-stringLength": "expressions/builtins.html#builtins-stringLength",
+  "#builtin-sub": "expressions/builtins.html#builtins-sub",
+  "#builtin-substring": "expressions/builtins.html#builtins-substring",
+  "#builtin-tail": "expressions/builtins.html#builtins-tail",
+  "#builtin-throw": "expressions/builtins.html#builtins-throw",
+  "#builtin-toFile": "expressions/builtins.html#builtins-toFile",
+  "#builtin-toJSON": "expressions/builtins.html#builtins-toJSON",
+  "#builtin-toPath": "expressions/builtins.html#builtins-toPath",
+  "#builtin-toString": "expressions/builtins.html#builtins-toString",
+  "#builtin-toXML": "expressions/builtins.html#builtins-toXML",
+  "#builtin-trace": "expressions/builtins.html#builtins-trace",
+  "#builtin-tryEval": "expressions/builtins.html#builtins-tryEval",
+  "#builtin-typeOf": "expressions/builtins.html#builtins-typeOf",
+  "#ssec-builtins": "expressions/builtins.html",
+  "#attr-system": "expressions/derivations.html#attr-system",
+  "#ssec-derivation": "expressions/derivations.html",
+  "#ch-expression-language": "expressions/expression-language.html",
+  "#sec-expression-syntax": "expressions/expression-syntax.html",
+  "#sec-generic-builder": "expressions/generic-builder.html",
+  "#sec-constructs": "expressions/language-constructs.html",
+  "#sect-let-expressions": "expressions/language-constructs.html#let-expressions",
+  "#ss-functions": "expressions/language-constructs.html#functions",
+  "#sec-language-operators": "expressions/language-operators.html",
+  "#table-operators": "expressions/language-operators.html",
+  "#ssec-values": "expressions/language-values.html",
+  "#sec-building-simple": "expressions/simple-building-testing.html",
+  "#ch-simple-expression": "expressions/simple-expression.html",
+  "#chap-writing-nix-expressions": "expressions/writing-nix-expressions.html",
+  "#gloss-closure": "glossary.html#gloss-closure",
+  "#gloss-derivation": "glossary.html#gloss-derivation",
+  "#gloss-deriver": "glossary.html#gloss-deriver",
+  "#gloss-nar": "glossary.html#gloss-nar",
+  "#gloss-output-path": "glossary.html#gloss-output-path",
+  "#gloss-profile": "glossary.html#gloss-profile",
+  "#gloss-reachable": "glossary.html#gloss-reachable",
+  "#gloss-reference": "glossary.html#gloss-reference",
+  "#gloss-substitute": "glossary.html#gloss-substitute",
+  "#gloss-user-env": "glossary.html#gloss-user-env",
+  "#gloss-validity": "glossary.html#gloss-validity",
+  "#part-glossary": "glossary.html",
+  "#sec-building-source": "installation/building-source.html",
+  "#ch-env-variables": "installation/env-variables.html",
+  "#sec-installer-proxy-settings": "installation/env-variables.html#proxy-environment-variables",
+  "#sec-nix-ssl-cert-file": "installation/env-variables.html#nix_ssl_cert_file",
+  "#sec-nix-ssl-cert-file-with-nix-daemon-and-macos": "installation/env-variables.html#nix_ssl_cert_file-with-macos-and-the-nix-daemon",
+  "#chap-installation": "installation/installation.html",
+  "#ch-installing-binary": "installation/installing-binary.html",
+  "#sect-macos-installation": "installation/installing-binary.html#macos-installation",
+  "#sect-macos-installation-change-store-prefix": "installation/installing-binary.html#macos-installation",
+  "#sect-macos-installation-encrypted-volume": "installation/installing-binary.html#macos-installation",
+  "#sect-macos-installation-recommended-notes": "installation/installing-binary.html#macos-installation",
+  "#sect-macos-installation-symlink": "installation/installing-binary.html#macos-installation",
+  "#sect-multi-user-installation": "installation/installing-binary.html#multi-user-installation",
+  "#sect-nix-install-binary-tarball": "installation/installing-binary.html#installing-from-a-binary-tarball",
+  "#sect-nix-install-pinned-version-url": "installation/installing-binary.html#installing-a-pinned-nix-version-from-a-url",
+  "#sect-single-user-installation": "installation/installing-binary.html#single-user-installation",
+  "#ch-installing-source": "installation/installing-source.html",
+  "#ssec-multi-user": "installation/multi-user.html",
+  "#ch-nix-security": "installation/nix-security.html",
+  "#sec-obtaining-source": "installation/obtaining-source.html",
+  "#sec-prerequisites-source": "installation/prerequisites-source.html",
+  "#sec-single-user": "installation/single-user.html",
+  "#ch-supported-platforms": "installation/supported-platforms.html",
+  "#ch-upgrading-nix": "installation/upgrading.html",
+  "#ch-about-nix": "introduction.html",
+  "#chap-introduction": "introduction.html",
+  "#ch-basic-package-mgmt": "package-management/basic-package-mgmt.html",
+  "#ssec-binary-cache-substituter": "package-management/binary-cache-substituter.html",
+  "#sec-channels": "package-management/channels.html",
+  "#ssec-copy-closure": "package-management/copy-closure.html",
+  "#sec-garbage-collection": "package-management/garbage-collection.html",
+  "#ssec-gc-roots": "package-management/garbage-collector-roots.html",
+  "#chap-package-management": "package-management/package-management.html",
+  "#sec-profiles": "package-management/profiles.html",
+  "#ssec-s3-substituter": "package-management/s3-substituter.html",
+  "#ssec-s3-substituter-anonymous-reads": "package-management/s3-substituter.html#anonymous-reads-to-your-s3-compatible-binary-cache",
+  "#ssec-s3-substituter-authenticated-reads": "package-management/s3-substituter.html#authenticated-reads-to-your-s3-binary-cache",
+  "#ssec-s3-substituter-authenticated-writes": "package-management/s3-substituter.html#authenticated-writes-to-your-s3-compatible-binary-cache",
+  "#sec-sharing-packages": "package-management/sharing-packages.html",
+  "#ssec-ssh-substituter": "package-management/ssh-substituter.html",
+  "#chap-quick-start": "quick-start.html",
+  "#sec-relnotes": "release-notes/release-notes.html",
+  "#ch-relnotes-0.10.1": "release-notes/rl-0.10.1.html",
+  "#ch-relnotes-0.10": "release-notes/rl-0.10.html",
+  "#ssec-relnotes-0.11": "release-notes/rl-0.11.html",
+  "#ssec-relnotes-0.12": "release-notes/rl-0.12.html",
+  "#ssec-relnotes-0.13": "release-notes/rl-0.13.html",
+  "#ssec-relnotes-0.14": "release-notes/rl-0.14.html",
+  "#ssec-relnotes-0.15": "release-notes/rl-0.15.html",
+  "#ssec-relnotes-0.16": "release-notes/rl-0.16.html",
+  "#ch-relnotes-0.5": "release-notes/rl-0.5.html",
+  "#ch-relnotes-0.6": "release-notes/rl-0.6.html",
+  "#ch-relnotes-0.7": "release-notes/rl-0.7.html",
+  "#ch-relnotes-0.8.1": "release-notes/rl-0.8.1.html",
+  "#ch-relnotes-0.8": "release-notes/rl-0.8.html",
+  "#ch-relnotes-0.9.1": "release-notes/rl-0.9.1.html",
+  "#ch-relnotes-0.9.2": "release-notes/rl-0.9.2.html",
+  "#ch-relnotes-0.9": "release-notes/rl-0.9.html",
+  "#ssec-relnotes-1.0": "release-notes/rl-1.0.html",
+  "#ssec-relnotes-1.1": "release-notes/rl-1.1.html",
+  "#ssec-relnotes-1.10": "release-notes/rl-1.10.html",
+  "#ssec-relnotes-1.11.10": "release-notes/rl-1.11.10.html",
+  "#ssec-relnotes-1.11": "release-notes/rl-1.11.html",
+  "#ssec-relnotes-1.2": "release-notes/rl-1.2.html",
+  "#ssec-relnotes-1.3": "release-notes/rl-1.3.html",
+  "#ssec-relnotes-1.4": "release-notes/rl-1.4.html",
+  "#ssec-relnotes-1.5.1": "release-notes/rl-1.5.1.html",
+  "#ssec-relnotes-1.5.2": "release-notes/rl-1.5.2.html",
+  "#ssec-relnotes-1.5": "release-notes/rl-1.5.html",
+  "#ssec-relnotes-1.6.1": "release-notes/rl-1.6.1.html",
+  "#ssec-relnotes-1.6.0": "release-notes/rl-1.6.html",
+  "#ssec-relnotes-1.7": "release-notes/rl-1.7.html",
+  "#ssec-relnotes-1.8": "release-notes/rl-1.8.html",
+  "#ssec-relnotes-1.9": "release-notes/rl-1.9.html",
+  "#ssec-relnotes-2.0": "release-notes/rl-2.0.html",
+  "#ssec-relnotes-2.1": "release-notes/rl-2.1.html",
+  "#ssec-relnotes-2.2": "release-notes/rl-2.2.html",
+  "#ssec-relnotes-2.3": "release-notes/rl-2.3.html"
+};
+
+var isRoot = (document.location.pathname.endsWith('/') || document.location.pathname.endsWith('/index.html')) && path_to_root === '';
+if (isRoot && redirects[document.location.hash]) {
+  document.location.href = path_to_root + redirects[document.location.hash];
+}
diff --git a/doc/manual/src/SUMMARY.md.in b/doc/manual/src/SUMMARY.md.in
index 860222337..825a8b4c0 100644
--- a/doc/manual/src/SUMMARY.md.in
+++ b/doc/manual/src/SUMMARY.md.in
@@ -72,6 +72,7 @@
   - [CLI guideline](contributing/cli-guideline.md)
 - [Release Notes](release-notes/release-notes.md)
   - [Release X.Y (202?-??-??)](release-notes/rl-next.md)
+  - [Release 2.9 (2022-05-30)](release-notes/rl-2.9.md)
   - [Release 2.8 (2022-04-19)](release-notes/rl-2.8.md)
   - [Release 2.7 (2022-03-07)](release-notes/rl-2.7.md)
   - [Release 2.6 (2022-01-24)](release-notes/rl-2.6.md)
diff --git a/doc/manual/src/advanced-topics/diff-hook.md b/doc/manual/src/advanced-topics/diff-hook.md
index 7a2622b3d..161e64b2a 100644
--- a/doc/manual/src/advanced-topics/diff-hook.md
+++ b/doc/manual/src/advanced-topics/diff-hook.md
@@ -101,7 +101,7 @@ In particular, notice the
 `/nix/store/krpqk0l9ib0ibi1d2w52z293zw455cap-unstable.check` output. Nix
 has copied the build results to that directory where you can examine it.
 
-> **Note**
+> []{#check-dirs-are-unregistered} **Note**
 > 
 > Check paths are not protected against garbage collection, and this
 > path will be deleted on the next garbage collection.
diff --git a/doc/manual/src/command-ref/env-common.md b/doc/manual/src/command-ref/env-common.md
index 6e2403461..3f3eb6915 100644
--- a/doc/manual/src/command-ref/env-common.md
+++ b/doc/manual/src/command-ref/env-common.md
@@ -2,11 +2,11 @@
 
 Most Nix commands interpret the following environment variables:
 
-  - `IN_NIX_SHELL`\
+  - [`IN_NIX_SHELL`]{#env-IN_NIX_SHELL}\
     Indicator that tells if the current environment was set up by
-    `nix-shell`. Since Nix 2.0 the values are `"pure"` and `"impure"`
+    `nix-shell`. It can have the values `pure` or `impure`.
 
-  - `NIX_PATH`\
+  - [`NIX_PATH`]{#env-NIX_PATH}\
     A colon-separated list of directories used to look up Nix
     expressions enclosed in angle brackets (i.e., `<path>`). For
     instance, the value
@@ -44,7 +44,7 @@ Most Nix commands interpret the following environment variables:
     The Nix search path can also be extended using the `-I` option to
     many Nix commands, which takes precedence over `NIX_PATH`.
 
-  - `NIX_IGNORE_SYMLINK_STORE`\
+  - [`NIX_IGNORE_SYMLINK_STORE`]{#env-NIX_IGNORE_SYMLINK_STORE}\
     Normally, the Nix store directory (typically `/nix/store`) is not
     allowed to contain any symlink components. This is to prevent
     “impure” builds. Builders sometimes “canonicalise” paths by
@@ -66,41 +66,41 @@ Most Nix commands interpret the following environment variables:
 
     Consult the mount 8 manual page for details.
 
-  - `NIX_STORE_DIR`\
+  - [`NIX_STORE_DIR`]{#env-NIX_STORE_DIR}\
     Overrides the location of the Nix store (default `prefix/store`).
 
-  - `NIX_DATA_DIR`\
+  - [`NIX_DATA_DIR`]{#env-NIX_DATA_DIR}\
     Overrides the location of the Nix static data directory (default
     `prefix/share`).
 
-  - `NIX_LOG_DIR`\
+  - [`NIX_LOG_DIR`]{#env-NIX_LOG_DIR}\
     Overrides the location of the Nix log directory (default
     `prefix/var/log/nix`).
 
-  - `NIX_STATE_DIR`\
+  - [`NIX_STATE_DIR`]{#env-NIX_STATE_DIR}\
     Overrides the location of the Nix state directory (default
     `prefix/var/nix`).
 
-  - `NIX_CONF_DIR`\
+  - [`NIX_CONF_DIR`]{#env-NIX_CONF_DIR}\
     Overrides the location of the system Nix configuration directory
     (default `prefix/etc/nix`).
 
-  - `NIX_CONFIG`\
+  - [`NIX_CONFIG`]{#env-NIX_CONFIG}\
     Applies settings from Nix configuration from the environment.
     The content is treated as if it was read from a Nix configuration file.
     Settings are separated by the newline character.
 
-  - `NIX_USER_CONF_FILES`\
+  - [`NIX_USER_CONF_FILES`]{#env-NIX_USER_CONF_FILES}\
     Overrides the location of the user Nix configuration files to load
     from (defaults to the XDG spec locations). The variable is treated
     as a list separated by the `:` token.
 
-  - `TMPDIR`\
+  - [`TMPDIR`]{#env-TMPDIR}\
     Use the specified directory to store temporary files. In particular,
     this includes temporary build directories; these can take up
     substantial amounts of disk space. The default is `/tmp`.
 
-  - `NIX_REMOTE`\
+  - [`NIX_REMOTE`]{#env-NIX_REMOTE}\
     This variable should be set to `daemon` if you want to use the Nix
     daemon to execute Nix operations. This is necessary in [multi-user
     Nix installations](../installation/multi-user.md). If the Nix
@@ -108,16 +108,16 @@ Most Nix commands interpret the following environment variables:
     should be set to `unix://path/to/socket`. Otherwise, it should be
     left unset.
 
-  - `NIX_SHOW_STATS`\
+  - [`NIX_SHOW_STATS`]{#env-NIX_SHOW_STATS}\
     If set to `1`, Nix will print some evaluation statistics, such as
     the number of values allocated.
 
-  - `NIX_COUNT_CALLS`\
+  - [`NIX_COUNT_CALLS`]{#env-NIX_COUNT_CALLS}\
     If set to `1`, Nix will print how often functions were called during
     Nix expression evaluation. This is useful for profiling your Nix
     expressions.
 
-  - `GC_INITIAL_HEAP_SIZE`\
+  - [`GC_INITIAL_HEAP_SIZE`]{#env-GC_INITIAL_HEAP_SIZE}\
     If Nix has been configured to use the Boehm garbage collector, this
     variable sets the initial size of the heap in bytes. It defaults to
     384 MiB. Setting it to a low value reduces memory consumption, but
diff --git a/doc/manual/src/command-ref/nix-build.md b/doc/manual/src/command-ref/nix-build.md
index 43de7a6e6..aacb32a25 100644
--- a/doc/manual/src/command-ref/nix-build.md
+++ b/doc/manual/src/command-ref/nix-build.md
@@ -47,16 +47,16 @@ All options not listed here are passed to `nix-store
 --realise`, except for `--arg` and `--attr` / `-A` which are passed to
 `nix-instantiate`.
 
-  - `--no-out-link`\
+  - [`--no-out-link`]{#opt-no-out-link}\
     Do not create a symlink to the output path. Note that as a result
     the output does not become a root of the garbage collector, and so
     might be deleted by `nix-store
                     --gc`.
 
-  - `--dry-run`\
+  - [`--dry-run`]{#opt-dry-run}\
     Show what store paths would be built or downloaded.
 
-  - `--out-link` / `-o` *outlink*\
+  - [`--out-link`]{#opt-out-link} / `-o` *outlink*\
     Change the name of the symlink to the output path created from
     `result` to *outlink*.
 
diff --git a/doc/manual/src/command-ref/nix-store.md b/doc/manual/src/command-ref/nix-store.md
index 7db9f0c1c..dc8faba68 100644
--- a/doc/manual/src/command-ref/nix-store.md
+++ b/doc/manual/src/command-ref/nix-store.md
@@ -22,7 +22,7 @@ This section lists the options that are common to all operations. These
 options are allowed for every subcommand, though they may not always
 have an effect.
 
-  - `--add-root` *path*\
+  - [`--add-root`]{#opt-add-root} *path*\
     Causes the result of a realisation (`--realise` and
     `--force-realise`) to be registered as a root of the garbage
     collector. *path* will be created as a symlink to the resulting
diff --git a/doc/manual/src/command-ref/opt-common.md b/doc/manual/src/command-ref/opt-common.md
index 7ee1a26bc..51d7de18a 100644
--- a/doc/manual/src/command-ref/opt-common.md
+++ b/doc/manual/src/command-ref/opt-common.md
@@ -2,13 +2,13 @@
 
 Most Nix commands accept the following command-line options:
 
-  - `--help`\
+  - [`--help`]{#opt-help}\
     Prints out a summary of the command syntax and exits.
 
-  - `--version`\
+  - [`--version`]{#opt-version}\
     Prints out the Nix version number on standard output and exits.
 
-  - `--verbose` / `-v`\
+  - [`--verbose`]{#opt-verbose} / `-v`\
     Increases the level of verbosity of diagnostic messages printed on
     standard error. For each Nix operation, the information printed on
     standard output is well-defined; any diagnostic information is
@@ -37,14 +37,14 @@ Most Nix commands accept the following command-line options:
       - 5\
         “Vomit”: print vast amounts of debug information.
 
-  - `--quiet`\
+  - [`--quiet`]{#opt-quiet}\
     Decreases the level of verbosity of diagnostic messages printed on
     standard error. This is the inverse option to `-v` / `--verbose`.
 
     This option may be specified repeatedly. See the previous verbosity
     levels list.
 
-  - `--log-format` *format*\
+  - [`--log-format`]{#opt-log-format} *format*\
     This option can be used to change the output of the log format, with
     *format* being one of:
 
@@ -66,14 +66,14 @@ Most Nix commands accept the following command-line options:
       - bar-with-logs\
         Display the raw logs, with the progress bar at the bottom.
 
-  - `--no-build-output` / `-Q`\
+  - [`--no-build-output`]{#opt-no-build-output} / `-Q`\
     By default, output written by builders to standard output and
     standard error is echoed to the Nix command's standard error. This
     option suppresses this behaviour. Note that the builder's standard
     output and error are always written to a log file in
     `prefix/nix/var/log/nix`.
 
-  - `--max-jobs` / `-j` *number*\
+  - [`--max-jobs`]{#opt-max-jobs} / `-j` *number*\
     Sets the maximum number of build jobs that Nix will perform in
     parallel to the specified number. Specify `auto` to use the number
     of CPUs in the system. The default is specified by the `max-jobs`
@@ -83,7 +83,7 @@ Most Nix commands accept the following command-line options:
     Setting it to `0` disallows building on the local machine, which is
     useful when you want builds to happen only on remote builders.
 
-  - `--cores`\
+  - [`--cores`]{#opt-cores}\
     Sets the value of the `NIX_BUILD_CORES` environment variable in
     the invocation of builders. Builders can use this variable at
     their discretion to control the maximum amount of parallelism. For
@@ -94,18 +94,18 @@ Most Nix commands accept the following command-line options:
     means that the builder should use all available CPU cores in the
     system.
 
-  - `--max-silent-time`\
+  - [`--max-silent-time`]{#opt-max-silent-time}\
     Sets the maximum number of seconds that a builder can go without
     producing any data on standard output or standard error. The
     default is specified by the `max-silent-time` configuration
     setting. `0` means no time-out.
 
-  - `--timeout`\
+  - [`--timeout`]{#opt-timeout}\
     Sets the maximum number of seconds that a builder can run. The
     default is specified by the `timeout` configuration setting. `0`
     means no timeout.
 
-  - `--keep-going` / `-k`\
+  - [`--keep-going`]{#opt-keep-going} / `-k`\
     Keep going in case of failed builds, to the greatest extent
     possible. That is, if building an input of some derivation fails,
     Nix will still build the other inputs, but not the derivation
@@ -113,13 +113,13 @@ Most Nix commands accept the following command-line options:
     for builds of substitutes), possibly killing builds in progress (in
     case of parallel or distributed builds).
 
-  - `--keep-failed` / `-K`\
+  - [`--keep-failed`]{#opt-keep-failed} / `-K`\
     Specifies that in case of a build failure, the temporary directory
     (usually in `/tmp`) in which the build takes place should not be
     deleted. The path of the build directory is printed as an
     informational message.
 
-  - `--fallback`\
+  - [`--fallback`]{#opt-fallback}\
     Whenever Nix attempts to build a derivation for which substitutes
     are known for each output path, but realising the output paths
     through the substitutes fails, fall back on building the derivation.
@@ -134,12 +134,12 @@ Most Nix commands accept the following command-line options:
     failure in obtaining the substitutes to lead to a full build from
     source (with the related consumption of resources).
 
-  - `--readonly-mode`\
+  - [`--readonly-mode`]{#opt-readonly-mode}\
     When this option is used, no attempt is made to open the Nix
     database. Most Nix operations do need database access, so those
     operations will fail.
 
-  - `--arg` *name* *value*\
+  - [`--arg`]{#opt-arg} *name* *value*\
     This option is accepted by `nix-env`, `nix-instantiate`,
     `nix-shell` and `nix-build`. When evaluating Nix expressions, the
     expression evaluator will automatically try to call functions that
@@ -170,13 +170,13 @@ Most Nix commands accept the following command-line options:
     since the argument is a Nix string literal, you have to escape the
     quotes.)
 
-  - `--argstr` *name* *value*\
+  - [`--argstr`]{#opt-argstr} *name* *value*\
     This option is like `--arg`, only the value is not a Nix
     expression but a string. So instead of `--arg system
     \"i686-linux\"` (the outer quotes are to keep the shell happy) you
     can say `--argstr system i686-linux`.
 
-  - `--attr` / `-A` *attrPath*\
+  - [`--attr`]{#opt-attr} / `-A` *attrPath*\
     Select an attribute from the top-level Nix expression being
     evaluated. (`nix-env`, `nix-instantiate`, `nix-build` and
     `nix-shell` only.) The *attribute path* *attrPath* is a sequence
@@ -191,7 +191,7 @@ Most Nix commands accept the following command-line options:
     attribute of the fourth element of the array in the `foo` attribute
     of the top-level expression.
 
-  - `--expr` / `-E`\
+  - [`--expr`]{#opt-expr} / `-E`\
     Interpret the command line arguments as a list of Nix expressions to
     be parsed and evaluated, rather than as a list of file names of Nix
     expressions. (`nix-instantiate`, `nix-build` and `nix-shell` only.)
@@ -202,17 +202,17 @@ Most Nix commands accept the following command-line options:
     use, give your expression to the `nix-shell -p` convenience flag
     instead.
 
-  - `-I` *path*\
+  - [`-I`]{#opt-I} *path*\
     Add a path to the Nix expression search path. This option may be
     given multiple times. See the `NIX_PATH` environment variable for
     information on the semantics of the Nix search path. Paths added
     through `-I` take precedence over `NIX_PATH`.
 
-  - `--option` *name* *value*\
+  - [`--option`]{#opt-option} *name* *value*\
     Set the Nix configuration option *name* to *value*. This overrides
     settings in the Nix configuration file (see nix.conf5).
 
-  - `--repair`\
+  - [`--repair`]{#opt-repair}\
     Fix corrupted or missing store paths by redownloading or rebuilding
     them. Note that this is slow because it requires computing a
     cryptographic hash of the contents of every path in the closure of
diff --git a/doc/manual/src/expressions/advanced-attributes.md b/doc/manual/src/expressions/advanced-attributes.md
index 000595815..2e7e80ed0 100644
--- a/doc/manual/src/expressions/advanced-attributes.md
+++ b/doc/manual/src/expressions/advanced-attributes.md
@@ -2,7 +2,7 @@
 
 Derivations can declare some infrequently used optional attributes.
 
-  - `allowedReferences`\
+  - [`allowedReferences`]{#adv-attr-allowedReferences}\
     The optional attribute `allowedReferences` specifies a list of legal
     references (dependencies) of the output of the builder. For example,
 
@@ -17,7 +17,7 @@ Derivations can declare some infrequently used optional attributes.
     booting Linux don’t have accidental dependencies on other paths in
     the Nix store.
 
-  - `allowedRequisites`\
+  - [`allowedRequisites`]{#adv-attr-allowedRequisites}\
     This attribute is similar to `allowedReferences`, but it specifies
     the legal requisites of the whole closure, so all the dependencies
     recursively. For example,
@@ -30,7 +30,7 @@ Derivations can declare some infrequently used optional attributes.
     runtime dependency than `foobar`, and in addition it enforces that
     `foobar` itself doesn't introduce any other dependency itself.
 
-  - `disallowedReferences`\
+  - [`disallowedReferences`]{#adv-attr-disallowedReferences}\
     The optional attribute `disallowedReferences` specifies a list of
     illegal references (dependencies) of the output of the builder. For
     example,
@@ -42,7 +42,7 @@ Derivations can declare some infrequently used optional attributes.
     enforces that the output of a derivation cannot have a direct
     runtime dependencies on the derivation `foo`.
 
-  - `disallowedRequisites`\
+  - [`disallowedRequisites`]{#adv-attr-disallowedRequisites}\
     This attribute is similar to `disallowedReferences`, but it
     specifies illegal requisites for the whole closure, so all the
     dependencies recursively. For example,
@@ -55,7 +55,7 @@ Derivations can declare some infrequently used optional attributes.
     dependency on `foobar` or any other derivation depending recursively
     on `foobar`.
 
-  - `exportReferencesGraph`\
+  - [`exportReferencesGraph`]{#adv-attr-exportReferencesGraph}\
     This attribute allows builders access to the references graph of
     their inputs. The attribute is a list of inputs in the Nix store
     whose references graph the builder needs to know. The value of
@@ -84,7 +84,7 @@ Derivations can declare some infrequently used optional attributes.
     with a Nix store containing the closure of a bootable NixOS
     configuration).
 
-  - `impureEnvVars`\
+  - [`impureEnvVars`]{#adv-attr-impureEnvVars}\
     This attribute allows you to specify a list of environment variables
     that should be passed from the environment of the calling user to
     the builder. Usually, the environment is cleared completely when the
@@ -112,7 +112,7 @@ Derivations can declare some infrequently used optional attributes.
     > environmental variables come from the environment of the
     > `nix-build`.
 
-  - `outputHash`; `outputHashAlgo`; `outputHashMode`\
+  - [`outputHash`]{#adv-attr-outputHash}; [`outputHashAlgo`]{#adv-attr-outputHashAlgo}; [`outputHashMode`]{#adv-attr-outputHashMode}\
     These attributes declare that the derivation is a so-called
     *fixed-output derivation*, which means that a cryptographic hash of
     the output is already known in advance. When the build of a
@@ -208,7 +208,7 @@ Derivations can declare some infrequently used optional attributes.
     [`nix-hash` command](../command-ref/nix-hash.md) for information
     about converting to and from base-32 notation.)
     
-  - `__contentAddressed`
+  - [`__contentAddressed`]{#adv-attr-__contentAddressed}
     If this **experimental** attribute is set to true, then the derivation
     outputs will be stored in a content-addressed location rather than the
     traditional input-addressed one.
@@ -216,7 +216,7 @@ Derivations can declare some infrequently used optional attributes.
     
     Setting this attribute also requires setting `outputHashMode` and `outputHashAlgo` like for *fixed-output derivations* (see above).
 
-  - `passAsFile`\
+  - [`passAsFile`]{#adv-attr-passAsFile}\
     A list of names of attributes that should be passed via files rather
     than environment variables. For example, if you have
 
@@ -234,7 +234,7 @@ Derivations can declare some infrequently used optional attributes.
     builder, since most operating systems impose a limit on the size
     of the environment (typically, a few hundred kilobyte).
 
-  - `preferLocalBuild`\
+  - [`preferLocalBuild`]{#adv-attr-preferLocalBuild}\
     If this attribute is set to `true` and [distributed building is
     enabled](../advanced-topics/distributed-builds.md), then, if
     possible, the derivation will be built locally instead of forwarded
@@ -242,7 +242,7 @@ Derivations can declare some infrequently used optional attributes.
     where the cost of doing a download or remote build would exceed
     the cost of building locally.
 
-  - `allowSubstitutes`\
+  - [`allowSubstitutes`]{#adv-attr-allowSubstitutes}\
     If this attribute is set to `false`, then Nix will always build this
     derivation; it will not try to substitute its outputs. This is
     useful for very trivial derivations (such as `writeText` in Nixpkgs)
diff --git a/doc/manual/src/expressions/builtin-constants.md b/doc/manual/src/expressions/builtin-constants.md
index 1404289e5..78d066a82 100644
--- a/doc/manual/src/expressions/builtin-constants.md
+++ b/doc/manual/src/expressions/builtin-constants.md
@@ -14,7 +14,7 @@ Here are the constants built into the Nix expression evaluator:
     This allows a Nix expression to fall back gracefully on older Nix
     installations that don’t have the desired built-in function.
 
-  - `builtins.currentSystem`\
+  - [`builtins.currentSystem`]{#builtins-currentSystem}\
     The built-in value `currentSystem` evaluates to the Nix platform
     identifier for the Nix installation on which the expression is being
     evaluated, such as `"i686-linux"` or `"x86_64-darwin"`.
diff --git a/doc/manual/src/expressions/derivations.md b/doc/manual/src/expressions/derivations.md
index d26a33b7f..3391ec0d8 100644
--- a/doc/manual/src/expressions/derivations.md
+++ b/doc/manual/src/expressions/derivations.md
@@ -4,7 +4,7 @@ The most important built-in function is `derivation`, which is used to
 describe a single derivation (a build action). It takes as input a set,
 the attributes of which specify the inputs of the build.
 
-  - There must be an attribute named `system` whose value must be a
+  - There must be an attribute named [`system`]{#attr-system} whose value must be a
     string specifying a Nix system type, such as `"i686-linux"` or
     `"x86_64-darwin"`. (To figure out your system type, run `nix -vv
     --version`.) The build can only be performed on a machine and
diff --git a/doc/manual/src/glossary.md b/doc/manual/src/glossary.md
index 71ff13275..3448b971b 100644
--- a/doc/manual/src/glossary.md
+++ b/doc/manual/src/glossary.md
@@ -1,48 +1,48 @@
 # Glossary
 
-  - derivation\
+  - [derivation]{#gloss-derivation}\
     A description of a build action. The result of a derivation is a
     store object. Derivations are typically specified in Nix expressions
     using the [`derivation` primitive](expressions/derivations.md). These are
     translated into low-level *store derivations* (implicitly by
     `nix-env` and `nix-build`, or explicitly by `nix-instantiate`).
 
-  - store\
+  - [store]{#gloss-store}\
     The location in the file system where store objects live. Typically
     `/nix/store`.
 
-  - store path\
+  - [store path]{#gloss-store-path}\
     The location in the file system of a store object, i.e., an
     immediate child of the Nix store directory.
 
-  - store object\
+  - [store object]{#gloss-store-object}\
     A file that is an immediate child of the Nix store directory. These
     can be regular files, but also entire directory trees. Store objects
     can be sources (objects copied from outside of the store),
     derivation outputs (objects produced by running a build action), or
     derivations (files describing a build action).
 
-  - substitute\
+  - [substitute]{#gloss-substitute}\
     A substitute is a command invocation stored in the Nix database that
     describes how to build a store object, bypassing the normal build
     mechanism (i.e., derivations). Typically, the substitute builds the
     store object by downloading a pre-built version of the store object
     from some server.
 
-  - purity\
+  - [purity]{#gloss-purity}\
     The assumption that equal Nix derivations when run always produce
     the same output. This cannot be guaranteed in general (e.g., a
     builder can rely on external inputs such as the network or the
     system time) but the Nix model assumes it.
 
-  - Nix expression\
+  - [Nix expression]{#gloss-nix-expression}\
     A high-level description of software packages and compositions
     thereof. Deploying software using Nix entails writing Nix
     expressions for your packages. Nix expressions are translated to
     derivations that are stored in the Nix store. These derivations can
     then be built.
 
-  - reference\
+  - [reference]{#gloss-reference}\
     A store path `P` is said to have a reference to a store path `Q` if
     the store object at `P` contains the path `Q` somewhere. The
     *references* of a store path are the set of store paths to which it
@@ -52,11 +52,11 @@
     output paths), whereas an output path only references other output
     paths.
 
-  - reachable\
+  - [reachable]{#gloss-reachable}\
     A store path `Q` is reachable from another store path `P` if `Q`
     is in the *closure* of the *references* relation.
 
-  - closure\
+  - [closure]{#gloss-closure}\
     The closure of a store path is the set of store paths that are
     directly or indirectly “reachable” from that store path; that is,
     it’s the closure of the path under the *references* relation. For
@@ -71,34 +71,34 @@
     to path `Q`, then `Q` is in the closure of `P`. Further, if `Q`
     references `R` then `R` is also in the closure of `P`.
 
-  - output path\
+  - [output path]{#gloss-output-path}\
     A store path produced by a derivation.
 
-  - deriver\
+  - [deriver]{#gloss-deriver}\
     The deriver of an *output path* is the store
     derivation that built it.
 
-  - validity\
+  - [validity]{#gloss-validity}\
     A store path is considered *valid* if it exists in the file system,
     is listed in the Nix database as being valid, and if all paths in
     its closure are also valid.
 
-  - user environment\
+  - [user environment]{#gloss-user-env}\
     An automatically generated store object that consists of a set of
     symlinks to “active” applications, i.e., other store paths. These
     are generated automatically by
     [`nix-env`](command-ref/nix-env.md). See *profiles*.
 
-  - profile\
+  - [profile]{#gloss-profile}\
     A symlink to the current *user environment* of a user, e.g.,
     `/nix/var/nix/profiles/default`.
 
-  - NAR\
+  - [NAR]{#gloss-nar}\
     A *N*ix *AR*chive. This is a serialisation of a path in the Nix
     store. It can contain regular files, directories and symbolic
     links.  NARs are generated and unpacked using `nix-store --dump`
     and `nix-store --restore`.
-  - `∅` \
+  - [`∅`]{#gloss-emtpy-set}\
     The empty set symbol. In the context of profile history, this denotes a package is not present in a particular version of the profile.
-  - `ε` \
+  - [`ε`]{#gloss-epsilon}\
     The epsilon symbol. In the context of a package, this means the version is empty. More precisely, the derivation does not have a version attribute.
diff --git a/doc/manual/src/installation/installing-binary.md b/doc/manual/src/installation/installing-binary.md
index e5fb50088..9fb9c80c3 100644
--- a/doc/manual/src/installation/installing-binary.md
+++ b/doc/manual/src/installation/installing-binary.md
@@ -186,7 +186,8 @@ and `/etc/zshrc` which you may remove.
 > read-only root will prevent you from manually deleting the empty `/nix`
 > mountpoint.
 
-# macOS Installation <a name="sect-macos-installation-change-store-prefix"></a><a name="sect-macos-installation-encrypted-volume"></a><a name="sect-macos-installation-symlink"></a><a name="sect-macos-installation-recommended-notes"></a>
+# macOS Installation
+[]{#sect-macos-installation-change-store-prefix}[]{#sect-macos-installation-encrypted-volume}[]{#sect-macos-installation-symlink}[]{#sect-macos-installation-recommended-notes}
 <!-- Note: anchors above to catch permalinks to old explanations -->
 
 We believe we have ironed out how to cleanly support the read-only root
diff --git a/doc/manual/src/release-notes/rl-2.9.md b/doc/manual/src/release-notes/rl-2.9.md
new file mode 100644
index 000000000..98cc4235d
--- /dev/null
+++ b/doc/manual/src/release-notes/rl-2.9.md
@@ -0,0 +1,47 @@
+# Release 2.9 (2022-05-30)
+
+* Running Nix with the new `--debugger` flag will cause it to start a
+  repl session if an exception is thrown during evaluation, or if
+  `builtins.break` is called.  From there you can inspect the values
+  of variables and evaluate Nix expressions.  In debug mode, the
+  following new repl commands are available:
+
+  ```
+  :env          Show env stack
+  :bt           Show trace stack
+  :st           Show current trace
+  :st <idx>     Change to another trace in the stack
+  :c            Go until end of program, exception, or builtins.break().
+  :s            Go one step
+  ```
+
+  Read more about the debugger
+  [here](https://www.zknotes.com/note/5970).
+
+* Nix now provides better integration with zsh's `run-help`
+  feature. It is now included in the Nix installation in the form of
+  an autoloadable shell function, `run-help-nix`. It picks up Nix
+  subcommands from the currently typed in command and directs the user
+  to the associated man pages.
+
+* `nix repl` has a new build-and-link (`:bl`) command that builds a
+  derivation while creating GC root symlinks.
+
+* The path produced by `builtins.toFile` is now allowed to be imported
+  or read even with restricted evaluation. Note that this will not
+  work with a read-only store.
+
+* `nix build` has a new `--print-out-paths` flag to print the
+  resulting output paths.  This matches the default behaviour of
+  `nix-build`.
+
+* You can now specify which outputs of a derivation `nix` should
+  operate on using the syntax `installable^outputs`,
+  e.g. `nixpkgs#glibc^dev,static` or `nixpkgs#glibc^*`. By default,
+  `nix` will use the outputs specified by the derivation's
+  `meta.outputsToInstall` attribute if it exists, or all outputs
+  otherwise.
+
+* `builtins.fetchTree` (and flake inputs) can now be used to fetch
+  plain files over the `http(s)` and `file` protocols in addition to
+  directory tarballs.
diff --git a/doc/manual/src/release-notes/rl-next.md b/doc/manual/src/release-notes/rl-next.md
index 6dbf6adae..5749f3924 100644
--- a/doc/manual/src/release-notes/rl-next.md
+++ b/doc/manual/src/release-notes/rl-next.md
@@ -1,29 +1,7 @@
 # Release X.Y (202?-??-??)
 
-* Nix now provides better integration with zsh's run-help feature. It is now
-  included in the Nix installation in the form of an autoloadable shell
-  function, run-help-nix. It picks up Nix subcommands from the currently typed
-  in command and directs the user to the associated man pages.
-
-* `nix repl` has a new build-'n-link (`:bl`) command that builds a derivation
-  while creating GC root symlinks.
-
-* The path produced by `builtins.toFile` is now allowed to be imported or read
-  even with restricted evaluation. Note that this will not work with a
-  read-only store.
-
-* `nix build` has a new `--print-out-paths` flag to print the resulting output paths.
-  This matches the default behaviour of `nix-build`.
-
-* You can now specify which outputs of a derivation `nix` should
-  operate on using the syntax `installable^outputs`,
-  e.g. `nixpkgs#glibc^dev,static` or `nixpkgs#glibc^*`. By default,
-  `nix` will use the outputs specified by the derivation's
-  `meta.outputsToInstall` attribute if it exists, or all outputs
-  otherwise.
-
-  Selecting derivation outputs using the attribute selection syntax
-  (e.g. `nixpkgs#glibc.dev`) no longer works.
+* Nix can now be built with LTO by passing `--enable-lto` to `configure`.
+  LTO is currently only supported when building with GCC.
 
 * `nix repl` now takes installables on the command line, unifying the usage
   with other commands that use `--file` and `--expr`. Primary breaking change