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following symbols:\n`:`, `_`, `.` and `-`.\n\nThe default is {option}`system.nixos.tags` separated by\n\"-\" + \"-\" + {env}`NIXOS_LABEL_VERSION` environment\nvariable (defaults to the value of\n{option}`system.nixos.version`).\n\nCan be overriden by setting {env}`NIXOS_LABEL`.\n\nUseful for not loosing track of configurations built from different\nnixos branches/revisions, e.g.:\n\n```\n#!/bin/sh\ntoday=`date +%Y%m%d`\nbranch=`(cd nixpkgs ; git branch 2>/dev/null | sed -n '/^\\* / { s|^\\* ||; p; }')`\nrevision=`(cd nixpkgs ; git rev-parse HEAD)`\nexport NIXOS_LABEL_VERSION=\"$today.$branch-", span: Span { start: Position { line: 16, column: 1, }, end: Position { line: 40, column: 52, }, }, }, ), Raw( PartRaw { content: "$", span: Span { start: Position { line: 16, column: 1, }, end: Position { line: 40, column: 55, }, }, }, ), Raw( PartRaw { content: "{revision:0:7}\"\nnixos-rebuild switch\n```\n", span: Span { start: Position { line: 16, column: 1, }, end: Position { line: 43, 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