Weird nix develop error

[suimong]

Describe the bug

On the latest master, nix develop fails with the following error:

       error: Cannot find Git revision 'a99d905216cc0aac5de0c3050f4afc54e21c6bc5' in ref 'refs/heads/master' of repository 'https://git.savannah.gnu.org/git/bash.git'! Please make sure that the rev exists on the ref you've specified or add allRefs = true; to fetchGit.

I tried on NixOS as well as Ubuntu with nix installed, the errors are the same.

Here is the full trace:

nix develop --show-trace

error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:9:12:
            8|
            9|   strict = derivationStrict drvAttrs;
             |            ^
           10|

       … while evaluating derivation 'nix-shell'
         whose name attribute is located at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'buildInputs' of derivation 'nix-shell'
         at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/stdenv/generic/make-derivation.nix:395:7:
          394|       depsHostHost                = elemAt (elemAt dependencies 1) 0;
          395|       buildInputs                 = elemAt (elemAt dependencies 1) 1;
             |       ^
          396|       depsTargetTarget            = elemAt (elemAt dependencies 2) 0;

       … while evaluating derivation 'topiary-0.3.0'
         whose name attribute is located at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'cargoArtifacts' of derivation 'topiary-0.3.0'
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/mkCargoDerivation.nix:44:10:
           43| chosenStdenv.mkDerivation (cleanedArgs // {
           44|   inherit cargoArtifacts;
             |          ^
           45|

       … while evaluating derivation 'topiary-deps-0.3.0'
         whose name attribute is located at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'cargoVendorDir' of derivation 'topiary-deps-0.3.0'
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/mkCargoDerivation.nix:54:3:
           53|   # access. Directory structure should basically follow the output of `cargo vendor`.
           54|   cargoVendorDir = args.cargoVendorDir or (vendorCargoDeps args);
             |   ^
           55|

       … while evaluating derivation 'vendor-cargo-deps'
         whose name attribute is located at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'buildCommand' of derivation 'vendor-cargo-deps'
         at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/build-support/trivial-builders/default.nix:87:14:
           86|       enableParallelBuilding = true;
           87|       inherit buildCommand name;
             |              ^
           88|       passAsFile = [ "buildCommand" ]

       … from call site
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/vendorMultipleCargoDeps.nix:77:5:
           76|   ${linkSources vendoredRegistries.sources}
           77|   ${linkSources vendoredGit.sources}
             |     ^
           78| ''

       … while calling 'linkSources'
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/vendorMultipleCargoDeps.nix:63:17:
           62|
           63|   linkSources = sources: concatMapStrings
             |                 ^
           64|     (name: ''

       … from call site
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/vendorMultipleCargoDeps.nix:63:26:
           62|
           63|   linkSources = sources: concatMapStrings
             |                          ^
           64|     (name: ''

       … while calling 'concatMapStrings'
         at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/lib/strings.nix:60:25:
           59|   */
           60|   concatMapStrings = f: list: concatStrings (map f list);
             |                         ^
           61|

       … while calling anonymous lambda
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/vendorMultipleCargoDeps.nix:64:6:
           63|   linkSources = sources: concatMapStrings
           64|     (name: ''
             |      ^
           65|       ln -s ${escapeShellArg sources.${name}} $out/${escapeShellArg name}

       … from call site
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/vendorMultipleCargoDeps.nix:65:15:
           64|     (name: ''
           65|       ln -s ${escapeShellArg sources.${name}} $out/${escapeShellArg name}
             |               ^
           66|     '')

       … while calling 'escapeShellArg'
         at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/lib/strings.nix:443:20:
          442|   */
          443|   escapeShellArg = arg: "'${replaceStrings ["'"] ["'\\''"] (toString arg)}'";
             |                    ^
          444|

       … while evaluating derivation 'linkLockedDeps'
         whose name attribute is located at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'buildCommand' of derivation 'linkLockedDeps'
         at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/build-support/trivial-builders/default.nix:87:14:
           86|       enableParallelBuilding = true;
           87|       inherit buildCommand name;
             |              ^
           88|       passAsFile = [ "buildCommand" ]

       … while calling anonymous lambda
         at /nix/store/q6y6d512iwxs8qplsgsn14jkbwdawg96-source/lib/vendorGitDeps.nix:101:12:
          100|         linkPsInLock = concatStringsSep "\n" (map
          101|           (p:
             |            ^
          102|             let

       … while evaluating derivation 'cargo-git'
         whose name attribute is located at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/stdenv/generic/make-derivation.nix:348:7

       … while evaluating attribute 'buildCommand' of derivation 'cargo-git'
         at /nix/store/hw0mp7awqma06m6s2h9yckyccxb63nqx-source/pkgs/build-support/trivial-builders/default.nix:87:14:
           86|       enableParallelBuilding = true;
           87|       inherit buildCommand name;
             |              ^
           88|       passAsFile = [ "buildCommand" ]

       error: Cannot find Git revision 'a99d905216cc0aac5de0c3050f4afc54e21c6bc5' in ref 'refs/heads/master' of repository 'https://git.savannah.gnu.org/git/bash.git'! Please make sure that the rev exists on the ref you've specified or add allRefs = true; to fetchGit.

To Reproduce

git clone https://githubcom/tweag/nickel.git
cd nickel
nix develop

Expected behavior
Enter the development shell.

[yannham]

We're seeing that when trying to update to latest Nixpkgs as well: #1733. We've had that before and I believe it's related to Topiary, which pulls a bash grammar in. However it should work with the current lockfile, as this is what we use on the CI. Did you update the lockfile, by any chance?

[suimong]

I tried the stock lockfile AND an updated lockfile but the issue is the same. I just tried cloning fresh from tweag/nickel and nix develop, same issue.

[yannham]

Ah. Thanks for the report. Looking into this with Topiary people. In the meantime, pinning the Nixpkgs input to latest stable instead of unstable might be worth trying (but also might not work, I haven't tried)

[suimong]

It's very weird, I tried with the 1.5.0-release branch, but still got the same issue...