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hst/fs: implement overlay fstype
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Browse Source 
This finally exposes overlay mounts in the high level hakurei API.

Signed-off-by: Ophestra <cat@gensokyo.uk>
This commit is contained in:
Ophestra
2025-08-15 03:30:51 +09:00
parent 4433c993fa
commit 9ed3ba85ea
12 changed files with 253 additions and 3 deletions
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15
hst/fs_test.go
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@@ -35,6 +35,10 @@ func TestFilesystemConfigJSON(t *testing.T) {
hst.FSImplError{Value: stubFS{"ephemeral"}},
"\x00", "\x00"},
{"bad impl overlay", hst.FilesystemConfigJSON{FilesystemConfig: stubFS{"overlay"}},
hst.FSImplError{Value: stubFS{"overlay"}},
"\x00", "\x00"},
{"bind", hst.FilesystemConfigJSON{
FilesystemConfig: &hst.FSBind{
Dst: m("/etc"),
@@ -55,6 +59,17 @@ func TestFilesystemConfigJSON(t *testing.T) {
}, nil,
`{"type":"ephemeral","dst":"/run/user/65534","write":true,"size":1024,"perm":448}`,
`{"fs":{"type":"ephemeral","dst":"/run/user/65534","write":true,"size":1024,"perm":448},"magic":3236757504}`},
{"overlay", hst.FilesystemConfigJSON{
FilesystemConfig: &hst.FSOverlay{
Dst: m("/nix/store"),
Lower: ms("/mnt-root/nix/.ro-store"),
Upper: m("/mnt-root/nix/.rw-store/upper"),
Work: m("/mnt-root/nix/.rw-store/work"),
},
}, nil,
`{"type":"overlay","dst":"/nix/store","lower":["/mnt-root/nix/.ro-store"],"upper":"/mnt-root/nix/.rw-store/upper","work":"/mnt-root/nix/.rw-store/work"}`,
`{"fs":{"type":"overlay","dst":"/nix/store","lower":["/mnt-root/nix/.ro-store"],"upper":"/mnt-root/nix/.rw-store/upper","work":"/mnt-root/nix/.rw-store/work"},"magic":3236757504}`},
}
for _, tc := range testCases {