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SSHStore / LegacySSHStore: Show a better error message if the remote is "nologin"

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Instead of

  error: serialised integer 7161674624452356180 is too large for type 'j'

we now get

  error: 'nix-store --serve' protocol mismatch from 'sshtest@localhost', got 'This account is currently not available.'

Fixes https://github.com/NixOS/nixpkgs/issues/37287.
This commit is contained in:
Eelco Dolstra 2021-09-23 17:48:52 +02:00
parent 60642aa5e2
commit 994348e9e0
2 changed files with 22 additions and 5 deletions
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15
src/libstore/legacy-ssh-store.cc
View file

@ -82,9 +82,18 @@ struct LegacySSHStore : public virtual LegacySSHStoreConfig, public virtual Stor
conn->to << SERVE_MAGIC_1 << SERVE_PROTOCOL_VERSION;
conn->to.flush();
unsigned int magic = readInt(conn->from);
if (magic != SERVE_MAGIC_2)
throw Error("protocol mismatch with 'nix-store --serve' on '%s'", host);
StringSink saved;
try {
TeeSource tee(conn->from, saved);
unsigned int magic = readInt(tee);
if (magic != SERVE_MAGIC_2)
throw Error("'nix-store --serve' protocol mismatch from '%s'", host);
} catch (SerialisationError & e) {
conn->sshConn->in.close();
auto msg = conn->from.drain();
throw Error("'nix-store --serve' protocol mismatch from '%s', got '%s'",
host, chomp(*saved.s + msg));
}
conn->remoteVersion = readInt(conn->from);
if (GET_PROTOCOL_MAJOR(conn->remoteVersion) != 0x200)
throw Error("unsupported 'nix-store --serve' protocol version on '%s'", host);