Add makefile target "user-account"

The target creates a user account and ensures its home directory is on a
btrfs filesystem (creating one if necessary).

Btrfs is necessary for fsmgr; it relies on "cp --reflink"

1 files changed, 32 insertions, 0 deletions

diff --git a/user.mk b/user.mk
new file mode 100644
index 0000000..4292fe8
--- /dev/null
+++ b/user.mk
@@ -0,0 +1,32 @@
+user_username = u
+user_home_path := $(shell getent passwd "$(user_username)" | (IFS=: read _ _ _ _ _ homedir _; echo $$homedir))
+user_home_btrfs = $(user_home_path).btrfs
+user_home_bytes = 10GiB
+user_home_force_replace =
+
+user_exists = getent passwd "$(user_username)" >/dev/null
+
+is_btrfs = df ~$(user_username) -t btrfs >/dev/null
+
+user-account:
+        [ "$(user_username)" ]
+        $(user_exists) || sudo useradd "$(user_username)" -G sudo -m -p '' -s /bin/bash
+        $(is_btrfs) || $(MAKE) mount-user-btrfs-home >/dev/null 2>&1 || $(MAKE) user-btrfs-home
+
+remove_user_home_btrfs = sudo mv -b "$(user_home_btrfs)" "$(user_home_btrfs)"~"$$(date -Is)"
+
+user-btrfs-home:
+        [ "$(user_home_path)" ]
+        [ ! -e "$(user_home_btrfs)" ] || $(if $(user_home_force_replace),$(remove_user_home_btrfs),false)
+        [ ! -e "$(user_home_btrfs)" ]
+        ! mountpoint -q "$(user_home_path)" || sudo umount "$(user_home_path)"
+        [ ! -e "$(user_home_path)" ] || sudo rmdir "$(user_home_path)" || sudo mv -b "$(user_home_path)" "$(user_home_path)"~"$$(date -Is)"
+        [ -e "$(user_home_btrfs)" ] || sudo fallocate -l "$(user_home_bytes)" "$(user_home_btrfs)"
+        sudo mkdir "$(user_home_path)"
+        sudo mkfs.btrfs "$(user_home_btrfs)"
+        sudo mount -t btrfs "$(user_home_btrfs)" "$(user_home_path)"
+        sudo rsync -a /etc/skel/ "$(user_home_path)"/
+        sudo chown -R "$(user_username):" "$(user_home_path)"
+
+mount-user-btrfs-home:
+        mountpoint -q "$(user_home_path)" || sudo mount -t btrfs "$(user_home_btrfs)" "$(user_home_path)"