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debos: disable ext4 dir_index on scratch for 32-bit architectures #704

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debos: disable ext4 dir_index on scratch for 32-bit architectures #704

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eef1bf2
HACK: Use fakemachine development branch
obbardc Jun 24, 2026
109ec8a
debos: disable ext4 dir_index on scratch for 32-bit architectures
obbardc Apr 21, 2026
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13 changes: 13 additions & 0 deletions cmd/debos/debos.go
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,14 @@ func doRun(r actions.Recipe, context *debos.Context) bool {
return true
}

func is32BitArch(arch string) bool {
switch arch {
case "armhf", "armel", "i386", "mips", "mipsel", "powerpc", "sh4":
return true
}
return false
}

func warnLocalhost(variable string, value string) {
message := `WARNING: Environment variable %[1]s contains a reference to
localhost. This may not work when running from fakemachine.
Expand Down Expand Up @@ -335,6 +343,11 @@ func main() {
log.Printf("WARNING: Scratch size of %dMB is less than recommended minimum 512MB\n", scratchsizeMB)
}
m.SetScratch(size, "")
if is32BitArch(r.Architecture) {
// dir_index stores d_off as a hash which can exceed INT32_MAX,
// causing readdir() to return EOVERFLOW on 32-bit guests.
m.SetScratchMkfsArgs([]string{"-O", "^dir_index"})

@obbardc obbardc Jun 24, 2026

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Maybe better to create another method in fakemachine, e.g. m.SetScratchFilesystem32BitCompatible(true|false) (false by default).

so debos becomes e.g.:

if is32BitArch(r.Architecture) {
	m.SetScratchFilesystem32BitCompatible(true)
}

}
}

m.SetShowBoot(options.ShowBoot)
Expand Down
8 changes: 4 additions & 4 deletions go.mod
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Original file line number Diff line number Diff line change
@@ -1,12 +1,12 @@
module github.com/go-debos/debos

go 1.24
go 1.24.0

require (
al.essio.dev/pkg/shellescape v1.6.0
github.com/docker/go-units v0.5.0
github.com/freddierice/go-losetup/v2 v2.0.1
github.com/go-debos/fakemachine v0.0.12
github.com/go-debos/fakemachine v0.0.13-0.20260421232847-3fd484f7a37c
github.com/go-task/slim-sprig/v3 v3.0.0
github.com/goccy/go-yaml v1.19.2
github.com/google/uuid v1.6.0
Expand All @@ -18,10 +18,10 @@ require (
require (
github.com/14rcole/gopopulate v0.0.0-20180821133914-b175b219e774 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/klauspost/compress v1.17.9 // indirect
github.com/klauspost/compress v1.18.5 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/surma/gocpio v1.1.0 // indirect
github.com/ulikunitz/xz v0.5.15 // indirect
golang.org/x/sys v0.22.0 // indirect
golang.org/x/sys v0.41.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
)
12 changes: 6 additions & 6 deletions go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,8 @@ github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4
github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
github.com/freddierice/go-losetup/v2 v2.0.1 h1:wPDx/Elu9nDV8y/CvIbEDz5Xi5Zo80y4h7MKbi3XaAI=
github.com/freddierice/go-losetup/v2 v2.0.1/go.mod h1:TEyBrvlOelsPEhfWD5rutNXDmUszBXuFnwT1kIQF4J8=
github.com/go-debos/fakemachine v0.0.12 h1:NbOFyWnc8xamXDgat/WrXym9LQn4P4gJ1/sWzp8GLxY=
github.com/go-debos/fakemachine v0.0.12/go.mod h1:vv6ZYmaY8qofwdZF3BZJW6xvb2fxUuKX59bQdGu6sRI=
github.com/go-debos/fakemachine v0.0.13-0.20260421232847-3fd484f7a37c h1:pX36QTX2OdaxpRNzERVQKCA4fCS0ZOWLgvT8lmPVNnk=
github.com/go-debos/fakemachine v0.0.13-0.20260421232847-3fd484f7a37c/go.mod h1:g2jKP3T5yoB/gU7Vv5Y+zn/QzUGaBVClFEa1J4txOnA=
github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
github.com/goccy/go-yaml v1.19.2 h1:PmFC1S6h8ljIz6gMRBopkjP1TVT7xuwrButHID66PoM=
Expand All @@ -20,8 +20,8 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/jessevdk/go-flags v1.6.1 h1:Cvu5U8UGrLay1rZfv/zP7iLpSHGUZ/Ou68T0iX1bBK4=
github.com/jessevdk/go-flags v1.6.1/go.mod h1:Mk8T1hIAWpOiJiHa9rJASDK2UGWji0EuPGBnNLMooyc=
github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
github.com/klauspost/compress v1.18.5 h1:/h1gH5Ce+VWNLSWqPzOVn6XBO+vJbCNGvjoaGBFW2IE=
github.com/klauspost/compress v1.18.5/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/sjoerdsimons/ostree-go v0.0.0-20201014091107-8fae757256f8 h1:fLxnJNJ++tkunS7BATed+mFqhA8KZYG7kT+WYEarYU4=
Expand All @@ -32,8 +32,8 @@ github.com/surma/gocpio v1.1.0 h1:RUWT+VqJ8GSodSv7Oh5xjIxy7r24CV1YvothHFfPxcQ=
github.com/surma/gocpio v1.1.0/go.mod h1:zaLNaN+EDnfSnNdWPJJf9OZxWF817w5dt8JNzF9LCVI=
github.com/ulikunitz/xz v0.5.15 h1:9DNdB5s+SgV3bQ2ApL10xRc35ck0DuIX/isZvIk+ubY=
github.com/ulikunitz/xz v0.5.15/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
Expand Down