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Add a db migration script

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This commit is contained in:
regnat 2021-05-19 12:30:12 +02:00
parent 63ebfc73c5
commit cb46d70794
1 changed files with 33 additions and 1 deletions
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34
src/libstore/local-store.cc
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@ -78,7 +78,7 @@ int getSchema(Path schemaPath)
void migrateCASchema(SQLite& db, Path schemaPath, AutoCloseFD& lockFd)
{
const int nixCASchemaVersion = 1;
const int nixCASchemaVersion = 2;
int curCASchema = getSchema(schemaPath);
if (curCASchema != nixCASchemaVersion) {
if (curCASchema > nixCASchemaVersion) {
@ -96,7 +96,39 @@ void migrateCASchema(SQLite& db, Path schemaPath, AutoCloseFD& lockFd)
#include "ca-specific-schema.sql.gen.hh"
;
db.exec(schema);
curCASchema = nixCASchemaVersion;
}
if (curCASchema < 2) {
SQLiteTxn txn(db);
// Ugly little sql dance to add a new `id` column and make it the primary key
db.exec(R"(
create table Realisations2 (
id integer primary key autoincrement not null,
drvPath text not null,
outputName text not null, -- symbolic output id, usually "out"
outputPath integer not null,
signatures text, -- space-separated list
foreign key (outputPath) references ValidPaths(id) on delete cascade
);
insert into Realisations2 (drvPath, outputName, outputPath, signatures)
select drvPath, outputName, outputPath, signatures from Realisations;
drop table Realisations;
alter table Realisations2 rename to Realisations;
)");
db.exec(R"(
create index if not exists IndexRealisations on Realisations(drvPath, outputName);
create table if not exists RealisationsRefs (
referrer integer not null,
realisationReference integer,
foreign key (referrer) references Realisations(id) on delete cascade,
foreign key (realisationReference) references Realisations(id) on delete restrict
);
)");
txn.commit();
}
writeFile(schemaPath, fmt("%d", nixCASchemaVersion));
lockFile(lockFd.get(), ltRead, true);
}