mongodb-memory-server
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Published
20 hours ago •
nodkz
nodkz
Add Support for NixOS
Versions
- Wanted System: NixOS
- Architecture: x86_64
Detection
$ cat /etc/upstream-release/lsb-release
cat: /etc/upstream-release/lsb-release: No such file or directory
$ cat /etc/os-release
BUG_REPORT_URL="https://github.com/NixOS/nixpkgs/issues"
BUILD_ID="23.11pre504832.8acef304efe"
DOCUMENTATION_URL="https://nixos.org/learn.html"
HOME_URL="https://nixos.org/"
ID=nixos
LOGO="nix-snowflake"
NAME=NixOS
PRETTY_NAME="NixOS 23.11 (Tapir)"
SUPPORT_URL="https://nixos.org/community.html"
VERSION="23.11 (Tapir)"
VERSION_CODENAME=tapir
VERSION_ID="23.11"
$ cat /usr/lib/os-release
cat: /usr/lib/os-release: No such file or directory
$ cat /etc/lsb-release
DISTRIB_CODENAME=tapir
DISTRIB_DESCRIPTION="NixOS 23.11 (Tapir)"
DISTRIB_ID=nixos
DISTRIB_RELEASE="23.11"
LSB_VERSION="23.11 (Tapir)"
Current Error
Unknown/unsupported linux "nixos(undefined)". Falling back to legacy MongoDB build!
Extra
could you try some versions from the following link and report back which versions work? (like ubuntu / debian or rhel versions) https://www.mongodb.com/download-center/community/releases/archive
Hey @hasezoey, sorry for the late reply, this one worked for me:
MONGOMS_DOWNLOAD_URL=https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2204-6.0.9.tgz
Hey @hasezoey, sorry for the late reply, this one worked for me:
thanks for the reply, i am a little unsure if ubuntu package compatability is with just this version, or multiple versions (across major mongodb versions), so for now i think i will only add at most a documentation entry noting that ubuntu packages may work (linking to this thread)
@danielpza are you still using the same nixos version? if not, could you post a updated detection output?
PS: for anyone coming across this issue in the future, since 8.15.0 a DISTRO config option was added, with this you can overwrite the distro detected
These ones I've tested so far:
| Distro | 7.0.0 | 6.0.9 | 5.0.20 |
|---|---|---|---|
| debian10 | - | x | x |
| debian11 | x | x | x |
| ubuntu1804 | - | ✔ | x |
| ubuntu2004 | x | ✔ | x |
| ubuntu2204 | x | ✔ | x |
- for mongodb version 5.0.20 on ubuntu I got the error
Instance failed to start because a library is missing or cannot be opened: "libcrypto.so.1.1" - for mongodb version 5.0.20 on debian I got the error
Instance closed unexpectedly with code "null" and signal "SIGSEGV" - for mongodb version 7.0.0 on ubuntu I got the error
Instance closed unexpectedly with code "100" and signal "null" - for mongodb version 7.0.0 on debian I got the error
Instance failed to start because a library is missing or cannot be opened: "libcrypto.so.1.1"
@danielpza are you still using the same nixos version? if not, could you post a updated detection output?
Yeah, I'm stilling using the same version (23.11)
detection output
$ cat /etc/upstream-release/lsb-release
'/etc/upstream-release/lsb-release': No such file or directory (os error 2)
$ cat /etc/os-release
BUG_REPORT_URL="https://github.com/NixOS/nixpkgs/issues"
BUILD_ID="23.11pre527133.5ba549eafcf3"
DOCUMENTATION_URL="https://nixos.org/learn.html"
HOME_URL="https://nixos.org/"
ID=nixos
LOGO="nix-snowflake"
NAME=NixOS
PRETTY_NAME="NixOS 23.11 (Tapir)"
SUPPORT_URL="https://nixos.org/community.html"
VERSION="23.11 (Tapir)"
VERSION_CODENAME=tapir
VERSION_ID="23.11"
$ cat /usr/lib/os-release
'/usr/lib/os-release': No such file or directory (os error 2)
$ cat /etc/lsb-release
DISTRIB_CODENAME=tapir
DISTRIB_DESCRIPTION="NixOS 23.11 (Tapir)"
DISTRIB_ID=nixos
DISTRIB_RELEASE="23.11"
LSB_VERSION="23.11 (Tapir)"
These ones I've tested so far:
just to confirm - means "not tested", x means "tested, but does not work", and ✔ means "tested and works"?
and the distro you have set via the DISTRO option, or are you using that distro / somehow emulating it (or something else)?
for mongodb version 7.0.0 on ubuntu I got the error Instance closed unexpectedly with code "100" and signal "null"
if i remember correctly, exit code 100 means that it couldnt find the database directory (ie it is "working" but couldnt find a user-defined directory), would need more of the log to investigate
just to confirm - means "not tested", x means "tested, but does not work", and ✔ means "tested and works"?
yup, exactly. I couldn't find the builds for debian10 and ubuntu 18.04 for mongodb 7, I think they are not supported
and the distro you have set via the DISTRO option, or are you using that distro / somehow emulating it (or something else)?
I'm using the MONGOMS_DOWNLOAD_URL env variable
if i remember correctly, exit code 100 means that it couldnt find the database directory (ie it is "working" but couldnt find a user-defined directory), would need more of the log to investigate
More logs with MONGOMS_DEBUG=1 for ubuntu 20.04, mongodb 7.0.0:
...
MongoMS:MongoInstance Mongo[37743]: stderrHandler: ""/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0: /run/current-system/sw/share/nix-ld/lib/libcurl.so.4: no version information available (required by /home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0)"" +0ms
...
MongoMS:MongoMemoryServer Mongo[unknown]: _startUpInstance threw a Error: StdoutInstanceError: Instance Failed to start with "DBException in initAndListen". Original Error:
Location18656: Cannot start server with an unknown storage engine: ephemeralForTest
...
full logs
MONGOMS_DEBUG=1 MONGOMS_DOWNLOAD_URL=https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-7.0.0.tgz yarn test
Determining test suites to run... MongoMS:ResolveConfig Debug Mode Enabled, through Environment Variable +0ms
MongoMS:ResolveConfig findPackageJson: Found package.json at "/home/daniel/project/package.json" +1ms
MongoMS:MongoMemoryServer Mongo[unknown]: start: Called .start() method +0ms
MongoMS:MongoMemoryServer Mongo[unknown]: _startUpInstance: Called MongoMemoryServer._startUpInstance() method +0ms
MongoMS:MongoMemoryServer Mongo[unknown]: getStartOptions: forceSamePort: false +1ms
MongoMS:MongoMemoryServer Mongo[unknown]: _startUpInstance: Creating new MongoDB instance with options: {
instance: {
port: 37743,
dbName: '',
ip: '127.0.0.1',
storageEngine: 'ephemeralForTest',
replSet: undefined,
dbPath: '/tmp/mongo-mem-EzuW1b',
tmpDir: '/tmp/mongo-mem-EzuW1b',
keyfileLocation: undefined,
launchTimeout: undefined,
args: undefined,
auth: false
},
binary: undefined,
spawn: undefined
} +2ms
MongoMS:MongoInstance create: Called .create() method +0ms
MongoMS:MongoInstance Mongo[37743]: start +1ms
MongoMS:MongoBinary getPath +0ms
MongoMS:DryMongoBinary generateOptions +0ms
MongoMS:utils tryReleaseFile: "/etc/upstream-release/lsb-release" does not exist +0ms
MongoMS:getos getLinuxInformation: Using etcOsRelease +0ms
MongoMS:DryMongoBinary generateDownloadPath: Generating Download Path, preferGlobal: "true" +1ms
MongoMS:DryMongoBinary generatePaths {
version: '5.0.18',
downloadDir: '',
os: {
os: 'linux',
dist: 'nixos',
codename: 'tapir',
release: '23.11',
id_like: undefined
},
platform: 'linux',
arch: 'x64',
systemBinary: ''
} +1ms
MongoMS:DryMongoBinary getBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary generateDownloadPath: Paths: {
legacyHomeCache: '/home/daniel/.cache/mongodb-binaries/mongod-x64-nixos-5.0.18',
modulesCache: '/home/daniel/project/node_modules/.cache/mongodb-memory-server/mongod-x64-nixos-5.0.18',
relative: '/home/daniel/project/mongodb-binaries/mongod-x64-nixos-5.0.18',
resolveConfig: ''
} +0ms
MongoMS:DryMongoBinary generateDownloadPath: no existing binary for version "5.0.18" was found +1ms
MongoMS:DryMongoBinary generateDownloadPath: using global (preferGlobal) "/home/daniel/.cache/mongodb-binaries/mongod-x64-nixos-5.0.18" +0ms
MongoMS:DryMongoBinary generateOptions: ARCHIVE_NAME or DOWNLOAD_URL defined, generating options based on that (input: "https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-7.0.0.tgz") +0ms
MongoMS:DryMongoBinary parseArchiveNameRegex (input: "https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-7.0.0.tgz") +0ms
MongoMS:MongoBinary getPath: MongoBinary options: {
"version": "7.0.0",
"downloadDir": "/home/daniel/.cache/mongodb-binaries",
"os": {
"os": "linux",
"dist": "ubuntu",
"release": ""
},
"platform": "linux",
"arch": "x86_64",
"systemBinary": "",
"checkMD5": false
} +3ms
MongoMS:DryMongoBinary locateBinary: Trying to locate Binary for version "7.0.0" +0ms
MongoMS:DryMongoBinary generateOptions +0ms
MongoMS:DryMongoBinary generateDownloadPath: Generating Download Path, preferGlobal: "true" +1ms
MongoMS:DryMongoBinary generatePaths {
version: '7.0.0',
downloadDir: '/home/daniel/.cache/mongodb-binaries',
os: { os: 'linux', dist: 'ubuntu', release: '' },
platform: 'linux',
arch: 'x86_64',
systemBinary: ''
} +0ms
MongoMS:DryMongoBinary getBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary generatePaths: resolveConfigValue is not empty +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary generateDownloadPath: Paths: {
legacyHomeCache: '/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0',
modulesCache: '/home/daniel/project/node_modules/.cache/mongodb-memory-server/mongod-x86_64-ubuntu-7.0.0',
relative: '/home/daniel/project/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0',
resolveConfig: '/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0'
} +0ms
MongoMS:DryMongoBinary generateDownloadPath: Found binary in resolveConfig (DOWNLOAD_DIR): "/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0" +0ms
MongoMS:DryMongoBinary generateOptions: ARCHIVE_NAME or DOWNLOAD_URL defined, generating options based on that (input: "https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-7.0.0.tgz") +0ms
MongoMS:DryMongoBinary parseArchiveNameRegex (input: "https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-ubuntu2004-7.0.0.tgz") +0ms
MongoMS:DryMongoBinary locateBinary: running generateDownloadPath +0ms
MongoMS:DryMongoBinary generateDownloadPath: Generating Download Path, preferGlobal: "true" +0ms
MongoMS:DryMongoBinary generatePaths {
version: '7.0.0',
downloadDir: '/home/daniel/.cache/mongodb-binaries',
os: { os: 'linux', dist: 'ubuntu', release: '' },
platform: 'linux',
arch: 'x86_64',
systemBinary: ''
} +0ms
MongoMS:DryMongoBinary getBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary generatePaths: resolveConfigValue is not empty +0ms
MongoMS:DryMongoBinary combineBinaryName +1ms
MongoMS:DryMongoBinary combineBinaryName +0ms
MongoMS:DryMongoBinary generateDownloadPath: Paths: {
legacyHomeCache: '/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0',
modulesCache: '/home/daniel/project/node_modules/.cache/mongodb-memory-server/mongod-x86_64-ubuntu-7.0.0',
relative: '/home/daniel/project/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0',
resolveConfig: '/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0'
} +0ms
MongoMS:DryMongoBinary generateDownloadPath: Found binary in resolveConfig (DOWNLOAD_DIR): "/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0" +0ms
MongoMS:DryMongoBinary locateBinary: found binary at "/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0" +0ms
MongoMS:MongoBinary getPath: Mongod binary path: "/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0" +2ms
MongoMS:MongoInstance Mongo[37743]: start: Starting Processes +5ms
MongoMS:MongoInstance Mongo[37743]: _launchMongod: Launching Mongod Process +0ms
MongoMS:MongoInstance Mongo[37743]: prepareCommandArgs +0ms
MongoMS:MongoInstance Mongo[37743]: prepareCommandArgs: final argument array:["--port","37743","--dbpath","/tmp/mongo-mem-EzuW1b","--storageEngine","ephemeralForTest","--bind_ip","127.0.0.1","--noauth"] +0ms
MongoMS:MongoInstance Mongo[37743]: _launchKiller: Launching Killer Process (parent: 419051, child: 419071) +18ms
MongoMS:MongoInstance Mongo[37743]: stdoutHandler: ""{"t":{"$date":"2023-09-25T16:32:35.961-04:00"},"s":"I", "c":"NETWORK", "id":4915701, "ctx":"main","msg":"Initialized wire specification","attr":{"spec":{"incomingExternalClient":{"minWireVersion":0,"maxWireVersion":21},"incomingInternalClient":{"minWireVersion":0,"maxWireVersion":21},"outgoing":{"minWireVersion":6,"maxWireVersion":21},"isInternalClient":true}}}
MongoMS:MongoInstance {"t":{"$date":"2023-09-25T16:32:35.962-04:00"},"s":"I", "c":"CONTROL", "id":23285, "ctx":"main","msg":"Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'"}"" +18ms
MongoMS:MongoInstance Mongo[37743]: stderrHandler: ""/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0: /run/current-system/sw/share/nix-ld/lib/libcurl.so.4: no version information available (required by /home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0)"" +0ms
MongoMS:MongoInstance Mongo[37743]: stdoutHandler: ""{"t":{"$date":"2023-09-25T16:32:35.963-04:00"},"s":"I", "c":"NETWORK", "id":4648601, "ctx":"main","msg":"Implicit TCP FastOpen unavailable. If TCP FastOpen is required, set tcpFastOpenServer, tcpFastOpenClient, and tcpFastOpenQueueSize."}
MongoMS:MongoInstance {"t":{"$date":"2023-09-25T16:32:35.963-04:00"},"s":"I", "c":"REPL", "id":5123008, "ctx":"main","msg":"Successfully registered PrimaryOnlyService","attr":{"service":"TenantMigrationDonorService","namespace":"config.tenantMigrationDonors"}}
MongoMS:MongoInstance {"t":{"$date":"2023-09-25T16:32:35.963-04:00"},"s":"I", "c":"REPL", "id":5123008, "ctx":"main","msg":"Successfully registered PrimaryOnlyService","attr":{"service":"TenantMigrationRecipientService","namespace":"config.tenantMigrationRecipients"}}"" +0ms
MongoMS:MongoInstance Mongo[37743]: stdoutHandler: ""{"t":{"$date":"2023-09-25T16:32:35.963-04:00"},"s":"I", "c":"CONTROL", "id":5945603, "ctx":"main","msg":"Multi threading initialized"}
MongoMS:MongoInstance {"t":{"$date":"2023-09-25T16:32:35.964-04:00"},"s":"I", "c":"TENANT_M", "id":7091600, "ctx":"main","msg":"Starting TenantMigrationAccessBlockerRegistry"}"" +1ms
MongoMS:MongoInstance Mongo[37743]: stdoutHandler: ""{"t":{"$date":"2023-09-25T16:32:35.964-04:00"},"s":"I", "c":"CONTROL", "id":4615611, "ctx":"initandlisten","msg":"MongoDB starting","attr":{"pid":419071,"port":37743,"dbPath":"/tmp/mongo-mem-EzuW1b","architecture":"64-bit","host":"nixos"}}"" +0ms
MongoMS:MongoInstance Mongo[37743]: stdoutHandler: ""{"t":{"$date":"2023-09-25T16:32:35.964-04:00"},"s":"I", "c":"CONTROL", "id":23403, "ctx":"initandlisten","msg":"Build Info","attr":{"buildInfo":{"version":"7.0.0","gitVersion":"37d84072b5c5b9fd723db5fa133fb202ad2317f1","openSSLVersion":"OpenSSL 3.0.10 1 Aug 2023","modules":[],"allocator":"tcmalloc","environment":{"distmod":"ubuntu2204","distarch":"x86_64","target_arch":"x86_64"}}}}
MongoMS:MongoInstance {"t":{"$date":"2023-09-25T16:32:35.964-04:00"},"s":"I", "c":"CONTROL", "id":51765, "ctx":"initandlisten","msg":"Operating System","attr":{"os":{"name":"nixos","version":"\"23.11\""}}}
MongoMS:MongoInstance {"t":{"$date":"2023-09-25T16:32:35.964-04:00"},"s":"I", "c":"CONTROL", "id":21951, "ctx":"initandlisten","msg":"Options set by command line","attr":{"options":{"net":{"bindIp":"127.0.0.1","port":37743},"security":{"authorization":"disabled"},"storage":{"dbPath":"/tmp/mongo-mem-EzuW1b","engine":"ephemeralForTest"}}}}"" +0ms
MongoMS:MongoInstance Mongo[37743]: stdoutHandler: ""{"t":{"$date":"2023-09-25T16:32:35.964-04:00"},"s":"E", "c":"CONTROL", "id":20557, "ctx":"initandlisten","msg":"DBException in initAndListen, terminating","attr":{"error":"Location18656: Cannot start server with an unknown storage engine: ephemeralForTest"}}"" +0ms
MongoMS:MongoInstance Mongo[37743]: constructor: Instance has thrown an Error: Error: Instance Failed to start with "DBException in initAndListen". Original Error:
MongoMS:MongoInstance Location18656: Cannot start server with an unknown storage engine: ephemeralForTest +0ms
MongoMS:MongoInstance Mongo[37743]: stop +1ms
MongoMS:utils Mongo[37743] killProcess: mongodProcess: sending "SIGINT" +43ms
MongoMS:MongoMemoryServer Mongo[unknown]: _startUpInstance threw a Error: StdoutInstanceError: Instance Failed to start with "DBException in initAndListen". Original Error:
Location18656: Cannot start server with an unknown storage engine: ephemeralForTest
at MongoInstance.checkErrorInLine (/home/daniel/project/node_modules/mongodb-memory-server-core/src/util/MongoInstance.ts:640:11)
at MongoInstance.stdoutHandler (/home/daniel/project/node_modules/mongodb-memory-server-core/src/util/MongoInstance.ts:585:10)
at Socket.emit (node:events:513:28)
at Socket.emit (node:domain:489:12)
at addChunk (node:internal/streams/readable:324:12)
at readableAddChunk (node:internal/streams/readable:297:9)
at Socket.Readable.push (node:internal/streams/readable:234:10)
at Pipe.onStreamRead (node:internal/stream_base_commons:190:23) +44ms
MongoMS:MongoMemoryServer Mongo[unknown]: stop: Called .stop() method +4ms
MongoMS:MongoMemoryServer Mongo[unknown]: stop: "instanceInfo" is not defined (never ran?) +0ms
Error: Instance Failed to start with "DBException in initAndListen". Original Error:
Location18656: Cannot start server with an unknown storage engine: ephemeralForTest
at MongoInstance.checkErrorInLine (/home/daniel/project/node_modules/mongodb-memory-server-core/src/util/MongoInstance.ts:640:11)
at MongoInstance.stdoutHandler (/home/daniel/project/node_modules/mongodb-memory-server-core/src/util/MongoInstance.ts:585:10)
at Socket.emit (node:events:513:28)
at Socket.emit (node:domain:489:12)
at addChunk (node:internal/streams/readable:324:12)
at readableAddChunk (node:internal/streams/readable:297:9)
at Socket.Readable.push (node:internal/streams/readable:234:10)
at Pipe.onStreamRead (node:internal/stream_base_commons:190:23)
More logs with MONGOMS_DEBUG=1 for ubuntu 20.04, mongodb 7.0.0:
MongoMS:MongoInstance Mongo[37743]: stderrHandler: ""/home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0: /run/current-system/sw/share/nix-ld/lib/libcurl.so.4: no version information available (required by /home/daniel/.cache/mongodb-binaries/mongod-x86_64-ubuntu-7.0.0)"" +0ms
well, i have not run this is message yet, though it seems like it is non-fatal?
Location18656: Cannot start server with an unknown storage engine: ephemeralForTest
your issue is that by default mms (8.x and below) is using storage engine ephermeralForTest, but it got removed in mongodb 7.0, MMS 9.0 fixes this issue (currently released is 9.0.0-beta.2)
@hasezoey after manually installing libcrypto.so.1.1 I got it to work in both debian and ubuntu
For reference, this is an extract of my home manager config:
programs.bash.bashrcExtra = ''
export PATH="$VOLTA_HOME/bin:$PATH"
export LD_LIBRARY_PATH="${
lib.makeLibraryPath (with pkgs; [
stdenv.cc.cc
openssl
openssl_1_1 # https://discourse.nixos.org/t/how-to-fix-library-is-missing-or-cannot-be-opened-libcrypto-so-1-1/30730, https://github.com/nodkz/mongodb-memory-server/issues/782
lzlib # related https://github.com/NixOS/nix/issues/1550
libGL
libuuid
curlFull
])
}:$LD_LIBRARY_PATH"
export MONGOMS_DISTRO="ubuntu2204"
'';
nixpkgs.config.permittedInsecurePackages = [ "openssl-1.1.1w" ];
@danielpza could you maybe re-test mongodb 7.0.0 with either storageEngine: "wiredTiger" or use mms version 9.0.0-beta.2?
@hasezoey I haven't been able to try it again with your suggestion. Just passing by to leave a configuration that works for me:
{
inputs = {
nixpkgs = { url = "github:NixOS/nixpkgs/nixpkgs-unstable"; };
flake-utils = { url = "github:numtide/flake-utils"; };
};
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachDefaultSystem (system:
let
pkgs = import nixpkgs {
inherit system;
config.permittedInsecurePackages = [ "openssl-1.1.1w" ];
};
lib = nixpkgs.lib;
in {
devShell = pkgs.mkShell {
MONGOMS_DISTRO = "ubuntu-22.04";
NIX_LD_LIBRARY_PATH = lib.makeLibraryPath
(with pkgs; [ stdenv.cc.cc openssl_1_1 curlFull ]);
NIX_LD =
builtins.readFile "${pkgs.stdenv.cc}/nix-support/dynamic-linker";
};
});
}