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Never leave updatedb.conf with two definitions of the same setting

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updatedb refuses to run at all on a config that defines a variable twice
("variable `PRUNEPATHS' was already defined"), so any rewrite that misses
an existing line and appends a second one takes the locate index down
rather than fixing it. Two shapes updatedb accepts got missed: a trailing
comment after the value, and a setting indented by whitespace.

Read the existing paths out of the quoted value and write the whole
setting back canonically instead of splicing into a line of unknown
shape. Quotes are not optional to updatedb ("value in quotes expected
after `='"), so a bare value is already a broken config: rewriting it
quoted repairs the file as a side effect.

The tests now hand every rewritten file to the real parser through
`updatedb --config-file`, which is what caught this.

Read the Snapper config as root when the running user cannot read it.
snapper create-config leaves the config root-only, and a config the user
cannot read was passing for one that wants its timeline snapshots kept.

Report the snapshots the drain could not delete. omarchy-migrate writes
the completion marker whether or not the batches succeeded, so there is
no later run to pick up the remainder, whatever the comment claimed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
David Heinemeier Hansson
2026-07-26 19:19:33 -07:00
co-authored by Claude Opus 5
parent f22e8cd353
commit 9b9d4b39eb
4 changed files with 97 additions and 22 deletions
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test/shell.d/locate-test.sh
+38 -3
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@@ -18,6 +18,19 @@ PRUNEPATHS = "/afs /media /mnt /net /sfs /tmp /udev /var/cache /var/lib/pacman/l
CONF
}
# updatedb dies on a config that defines a variable twice, so hand every
# rewritten file to the real parser rather than trusting the greps below.
empty_tree="$test_tmp/empty-tree"
mkdir -p "$empty_tree"
assert_conf_parses() {
command -v updatedb >/dev/null || return 0
local errors
errors=$(updatedb --config-file "$1" -U "$empty_tree" -o "$test_tmp/plocate.db" 2>&1 >/dev/null | grep -F "$1:" || true)
[[ -z $errors ]] || fail "updatedb accepts the rewritten config" "$errors"
}
conf="$test_tmp/updatedb.conf"
stock_conf "$conf"
@@ -25,11 +38,13 @@ OMARCHY_UPDATEDB_CONF_PATH="$conf" bash -euo pipefail "$config_script" >/dev/nul
grep -qFx 'PRUNE_BIND_MOUNTS = "no"' "$conf" || fail "locate config indexes Btrfs subvolume mounts like /home"
grep -qF 'PRUNEPATHS = "/.snapshots /afs' "$conf" || fail "locate config prunes /.snapshots"
assert_conf_parses "$conf"
pass "locate config skips Btrfs snapshots and indexes Btrfs subvolumes"
OMARCHY_UPDATEDB_CONF_PATH="$conf" bash -euo pipefail "$config_script" >/dev/null
[[ $(grep -o '/\.snapshots' "$conf" | wc -l) -eq 1 ]] || fail "locate config is idempotent"
assert_conf_parses "$conf"
pass "locate config leaves an already-configured file alone"
OMARCHY_UPDATEDB_CONF_PATH="$test_tmp/missing.conf" bash -euo pipefail "$config_script" >/dev/null
@@ -44,6 +59,7 @@ OMARCHY_UPDATEDB_CONF_PATH="$conf" bash -euo pipefail "$config_script" >/dev/nul
grep -qFx 'PRUNE_BIND_MOUNTS = "no"' "$conf" || fail "locate config adds a missing PRUNE_BIND_MOUNTS"
grep -qFx 'PRUNEPATHS = "/.snapshots"' "$conf" || fail "locate config adds a missing PRUNEPATHS"
assert_conf_parses "$conf"
pass "locate config adds settings a hand-edited updatedb.conf is missing"
conf="$test_tmp/unspaced-updatedb.conf"
@@ -53,16 +69,34 @@ OMARCHY_UPDATEDB_CONF_PATH="$conf" bash -euo pipefail "$config_script" >/dev/nul
grep -qFx 'PRUNE_BIND_MOUNTS = "no"' "$conf" || fail "locate config rewrites an unspaced PRUNE_BIND_MOUNTS"
grep -qFx 'PRUNEPATHS = "/.snapshots /tmp /var/tmp"' "$conf" || fail "locate config prunes /.snapshots in an unspaced PRUNEPATHS"
[[ $(grep -c '^PRUNEPATHS' "$conf") -eq 1 ]] || fail "locate config keeps a single PRUNEPATHS setting"
[[ $(grep -c 'PRUNEPATHS' "$conf") -eq 1 ]] || fail "locate config keeps a single PRUNEPATHS setting"
assert_conf_parses "$conf"
pass "locate config handles updatedb.conf written without spaces around ="
# updatedb allows a comment after a value and indented settings, and defining
# either setting twice makes it refuse to run at all.
conf="$test_tmp/commented-updatedb.conf"
printf '%s\n' ' PRUNE_BIND_MOUNTS = "yes" # subvolumes look like bind mounts' \
'PRUNEPATHS = "/tmp" # scratch' >"$conf"
OMARCHY_UPDATEDB_CONF_PATH="$conf" bash -euo pipefail "$config_script" >/dev/null
grep -qFx 'PRUNE_BIND_MOUNTS = "no"' "$conf" || fail "locate config rewrites an indented PRUNE_BIND_MOUNTS"
grep -qFx 'PRUNEPATHS = "/.snapshots /tmp"' "$conf" || fail "locate config keeps the paths a commented PRUNEPATHS already prunes"
[[ $(grep -c 'PRUNEPATHS' "$conf") -eq 1 ]] || fail "locate config replaces a commented PRUNEPATHS instead of adding a second one"
assert_conf_parses "$conf"
pass "locate config handles indented settings and trailing comments"
# A hand-edited file may have dropped the quotes updatedb requires, which
# leaves it unparseable until something writes the setting out properly.
conf="$test_tmp/unquoted-updatedb.conf"
printf '%s\n' 'PRUNEPATHS = /tmp' >"$conf"
OMARCHY_UPDATEDB_CONF_PATH="$conf" bash -euo pipefail "$config_script" >/dev/null
grep -qFx 'PRUNEPATHS = "/.snapshots /tmp"' "$conf" || fail "locate config keeps the paths an unquoted PRUNEPATHS already prunes"
[[ $(grep -c '^PRUNEPATHS' "$conf") -eq 1 ]] || fail "locate config replaces an unquoted PRUNEPATHS instead of adding a second one"
grep -qFx 'PRUNEPATHS = "/.snapshots"' "$conf" || fail "locate config repairs an unquoted PRUNEPATHS"
[[ $(grep -c 'PRUNEPATHS' "$conf") -eq 1 ]] || fail "locate config replaces an unquoted PRUNEPATHS instead of adding a second one"
assert_conf_parses "$conf"
pass "locate config handles updatedb.conf written without quotes"
# A path that merely ends in /.snapshots is not the root snapshot directory.
@@ -72,6 +106,7 @@ printf '%s\n' 'PRUNEPATHS = "/var/lib/machines/.snapshots"' >"$conf"
OMARCHY_UPDATEDB_CONF_PATH="$conf" bash -euo pipefail "$config_script" >/dev/null
grep -qFx 'PRUNEPATHS = "/.snapshots /var/lib/machines/.snapshots"' "$conf" || fail "locate config prunes /.snapshots alongside a path that ends in it"
assert_conf_parses "$conf"
pass "locate config tells /.snapshots apart from a path that ends in it"
locate_migration=$(grep -rl 'Configure locate to skip Btrfs snapshots' "$ROOT/migrations" | head -n 1 || true)