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container/initoverlay: configure via fsconfig
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This works around the page size limit at the cost of negligible performance regressions.

Closes #34.

Signed-off-by: Ophestra <cat@gensokyo.uk>
This commit is contained in:
Ophestra
2026-05-04 02:07:52 +09:00
parent 024489e800
commit da11b26ec1
11 changed files with 124 additions and 91 deletions
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36
internal/pkg/testdata/main.go vendored
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@@ -14,7 +14,6 @@ import (
"strconv"
"strings"
"hakurei.app/check"
"hakurei.app/fhs"
"hakurei.app/vfs"
)
@@ -159,43 +158,24 @@ func main() {
m.Source != "overlay" || m.FsType != "overlay" {
log.Fatal("unexpected root mount entry")
}
var lowerdir string
var lowerdir []string
for _, o := range strings.Split(m.FsOptstr, ",") {
const lowerdirKey = "lowerdir="
const lowerdirKey = "lowerdir+="
if strings.HasPrefix(o, lowerdirKey) {
lowerdir = o[len(lowerdirKey):]
lowerdir = append(lowerdir, o[len(lowerdirKey):])
}
}
if !layers {
if filepath.Base(lowerdir) != checksumEmptyDir {
if len(lowerdir) != 1 || filepath.Base(lowerdir[0]) != checksumEmptyDir {
log.Fatal("unexpected artifact checksum")
}
} else {
ident = "p1t_drXr34i-jZNuxDMLaMOdL6tZvQqhavNafGynGqxOZoXAUTSn7kqNh3Ovv3DT"
lowerdirsEscaped := strings.Split(lowerdir, ":")
lowerdirs := lowerdirsEscaped[:0]
// ignore the option separator since it does not appear in ident
for i, e := range lowerdirsEscaped {
if len(e) > 0 &&
e[len(e)-1] == check.SpecialOverlayEscape[0] &&
(len(e) == 1 || e[len(e)-2] != check.SpecialOverlayEscape[0]) {
// ignore escaped pathname separator since it does not
// appear in ident
e = e[:len(e)-1]
if len(lowerdirsEscaped) != i {
lowerdirsEscaped[i+1] = e + lowerdirsEscaped[i+1]
continue
}
}
lowerdirs = append(lowerdirs, e)
}
if len(lowerdirs) != 2 ||
filepath.Base(lowerdirs[0]) != "MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU" ||
filepath.Base(lowerdirs[1]) != "nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK" {
log.Fatalf("unexpected lowerdirs %s", strings.Join(lowerdirs, ", "))
if len(lowerdir) != 2 ||
filepath.Base(lowerdir[0]) != "MGWmEfjut2QE2xPJwTsmUzpff4BN_FEnQ7T0j7gvUCCiugJQNwqt9m151fm9D1yU" ||
filepath.Base(lowerdir[1]) != "nY_CUdiaUM1OL4cPr5TS92FCJ3rCRV7Hm5oVTzAvMXwC03_QnTRfQ5PPs7mOU9fK" {
log.Fatalf("unexpected lowerdirs %s", strings.Join(lowerdir, ", "))
}
}
} else {