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Postgres migration script.
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#!/usr/bin/env sh | |
set -eu | |
if [ $# -ne 0 ]; then | |
cat <<-USAGE | |
psql-migrate | |
Takes a sorted list of filenames from stdin and writes psql migrations sql | |
to stdout. | |
usage: | |
ls -1v migrations/* | psql-migrate | psql ... | |
safety: | |
* A migration table called 'schema_migrations' will be created. | |
* Paths passed to stdin must be relative to the script or absolute. | |
* Only migration file basenames are persisted in schema_migrations. | |
USAGE | |
exit 0 | |
fi | |
migrations="" | |
while read -r migration; do | |
if [ ! -r "$migration" ]; then | |
echo "error: '$migration' not readable." | |
[ "$migration" = "$(basename "$migration")" ] && echo "Did you forget to include the path?" | |
exit -1 | |
fi | |
migrations="${migrations} $migration" | |
done < /dev/stdin | |
cat <<-SQL | |
\set ON_ERROR_STOP ON | |
create table if not exists schema_migrations ( | |
migration text not null primary key, | |
completed timestamp with time zone not null default now() | |
); | |
SQL | |
for migration in $migrations; do | |
filename=$(basename "$migration") | |
cat <<-SQL | |
-- begin migration $filename | |
do \$$ | |
begin | |
perform 1 from schema_migrations where migration = '$filename'; | |
if not found then | |
raise notice 'migration "%", begin', '$filename'; | |
-- begin sql | |
$(cat "$migration") | |
-- end sql | |
insert into schema_migrations values ('$filename'); | |
raise notice 'migration "%", end', '$filename'; | |
else | |
raise notice 'migration "%" already run, skipping', '$filename'; | |
end if; | |
end | |
\$$; | |
-- end migration $filename | |
SQL | |
done |
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