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Add overlay filesystem support for spark user home directory

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- Create separate overlay directories for /var and /home/spark
- Mount overlay on /home/spark for writable user data
- Update welcome message to show /home/spark is writable
- Ensures user files persist across sessions in tmpfs overlay

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot]
2025-12-29 19:58:25 +00:00
parent f5dceb8aee
commit 927163d8eb
1 changed files with 14 additions and 4 deletions
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18
src/init.c
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@@ -104,17 +104,27 @@ int main(int argc, char *argv[]) {
printf("Setting up overlay filesystem for writable layer...\n"); printf("Setting up overlay filesystem for writable layer...\n");
// Create overlay directories in tmpfs // Create overlay directories in tmpfs
if (system("mkdir -p /tmp/overlay/upper /tmp/overlay/work 2>/dev/null") != 0) { if (system("mkdir -p /tmp/overlay/var-upper /tmp/overlay/var-work 2>/dev/null") != 0) {
fprintf(stderr, "Warning: Failed to create overlay directories\n"); fprintf(stderr, "Warning: Failed to create overlay directories for /var\n");
}
if (system("mkdir -p /tmp/overlay/home-upper /tmp/overlay/home-work 2>/dev/null") != 0) {
fprintf(stderr, "Warning: Failed to create overlay directories for /home/spark\n");
} }
// Mount overlay on /var for logs and runtime data // Mount overlay on /var for logs and runtime data
if (system("mount -t overlay overlay -o lowerdir=/var,upperdir=/tmp/overlay/upper,workdir=/tmp/overlay/work /var 2>/dev/null") != 0) { if (system("mount -t overlay overlay -o lowerdir=/var,upperdir=/tmp/overlay/var-upper,workdir=/tmp/overlay/var-work /var 2>/dev/null") != 0) {
fprintf(stderr, "Warning: Failed to mount overlay on /var - system may be read-only\n"); fprintf(stderr, "Warning: Failed to mount overlay on /var - system may be read-only\n");
} else { } else {
printf("Overlay filesystem mounted on /var (base OS is immutable)\n"); printf("Overlay filesystem mounted on /var (base OS is immutable)\n");
} }
// Mount overlay on /home/spark for user data
if (system("mount -t overlay overlay -o lowerdir=/home/spark,upperdir=/tmp/overlay/home-upper,workdir=/tmp/overlay/home-work /home/spark 2>/dev/null") != 0) {
fprintf(stderr, "Warning: Failed to mount overlay on /home/spark - home directory may be read-only\n");
} else {
printf("Overlay filesystem mounted on /home/spark (writable user home)\n");
}
// Mount tmpfs on /run for runtime data // Mount tmpfs on /run for runtime data
if (system("mkdir -p /run 2>/dev/null") == 0) { if (system("mkdir -p /run 2>/dev/null") == 0) {
if (system("mount -t tmpfs tmpfs /run 2>/dev/null") != 0) { if (system("mount -t tmpfs tmpfs /run 2>/dev/null") != 0) {
@@ -132,7 +142,7 @@ int main(int argc, char *argv[]) {
printf("Welcome to SparkOS!\n"); printf("Welcome to SparkOS!\n");
printf("===================\n"); printf("===================\n");
printf("Base OS: Read-only (immutable)\n"); printf("Base OS: Read-only (immutable)\n");
printf("Writable: /tmp, /var (overlay), /run\n\n"); printf("Writable: /tmp, /var (overlay), /home/spark (overlay), /run\n\n");
// Main loop - keep respawning shell // Main loop - keep respawning shell
while (1) { while (1) {