filesystem: move MAYBE_FIRST_START out of the post-install scripts

The main reason we have the first install warning still is that we
fill $HOME with bash related scripts that will only get executed
on the next login shell.

Simplify things by keeping MAYBE_FIRST_START logic in one file
and make it depend on wether $HOME was missing at the beginning.

filesystem/07-pacman-key.post

@@ -7,8 +7,6 @@ maybe_init_keyring ()
     /usr/bin/pacman-key --populate msys2 || true
     /usr/bin/pacman-key --refresh-keys || true
     /usr/bin/gpgconf --kill all
-    
-    MAYBE_FIRST_START=true
   fi
 }
 

filesystem/PKGBUILD

@@ -69,7 +69,7 @@ sha256sums=('742a7d66b7a5ebd2b8461728c5b44a46b2305fd2116208eecae5f45828938ea0'
             '22c0d481c7717eee7be0b29c69df15f65d39f16e4af50ad21919bd59259896d1'
             '5f7aa3a776dbdaae78a27e608bf004bf50d5aaace2c2b03581d940b771bc8582'
             '91f1f918cf13deab0124082086e990786113b0e710dbda4678d8fc14905ad94d'
-            '62e6c515d98c8bf609c77dcbae4efa940f1397c2e47dbc342fb6fe5139bd11f2'
+            '90d42690cd460a102dacbdfc9b68c3f4c71260f48c9a18b7f8da4eca3d26dbee'
             '6c0ca979c7b146b3750103b1296a399764f4e1b222ee091d3aa072b6da16c1a5'
             'cbec90c9403826bf6d8dd1fed16240b9d8695ec15df5dcdab7e485bb46c016ab'
             '1b5adfbee606fc68c4fbba5d8caded4f463bd5eed9438cf2c560129d42ba4346'
@@ -80,7 +80,7 @@ sha256sums=('742a7d66b7a5ebd2b8461728c5b44a46b2305fd2116208eecae5f45828938ea0'
             'd7b7eb4cd9e1f9bc227b009cdcacf700f5523ccc109fbd3c1c0331726d314c9e'
             '9c126262051a047450ed97397ee89a7148098c03ae00a1cd67c3f3425d8e4b12'
             '549859e17dc0b8d5c0374103c8a1afc6995bc61ce8f1423eeed51dc9e6cc74e0'
-            '574564607e5ea8d877f42d59c164801e3efa4393a0a74c0714d9b9a778dec43f'
+            '19badd8d5d7e0052028c466fc1eb7fcf8f7e1fb50cb832be389922047897ef3e'
             'caf25e3390331c6a22cc91f1c1bc551a9f87c59171dd3ef7b3b6016859a10fb5'
             '28c42ec8a6888e63b2156a802d93e74b544eff211ec688fb6ce8e67e12b81156'
             '26bf8d1acade9431d60c035a7ddfa9cb0775d5b9a457c5aca56f51c5f2f93f98'

filesystem/profile

@@ -65,6 +65,10 @@ esac
 CONFIG_SITE="/etc/config.site"
 
 MAYBE_FIRST_START=false
+if [ ! -d "${HOME}" ]; then
+  MAYBE_FIRST_START=true
+fi
+
 SYSCONFDIR="${SYSCONFDIR:=/etc}"
 
 # TMP and TEMP as defined in the Windows environment must be kept