Enable SSH and no-login access to public repos

gitea-host/install.sh

@@ -289,10 +289,27 @@ create_git_user() {
     fi
 
     # Use what the system really has (matters when the user already existed).
-    local entry
+    local entry configured_default
+    configured_default="$GITEA_HOME"   # the script's own default/--env-var choice, before we overwrite it below
     entry="$(getent passwd "$GITEA_USER")"
     GITEA_HOME="$(cut -d: -f6 <<<"$entry")"
     GITEA_GROUP="$(id -gn "$GITEA_USER")"
+
+    # A pre-existing 'git' account (made by some other package, a bare distro
+    # default, or an earlier partial install) commonly has NO real home
+    # directory: 'useradd --system' without --create-home still records a path
+    # in /etc/passwd but never creates it on disk. Left alone, every path this
+    # script builds from GITEA_HOME (repos, authorized_keys) lands wherever
+    # that missing path's nearest existing ancestor is -- for a bare, never-
+    # created path that resolves to the filesystem root. Fix it in place.
+    if [[ -z "$GITEA_HOME" || "$GITEA_HOME" == "/" || ! -d "$GITEA_HOME" ]]; then
+        warn "User '${GITEA_USER}' has no real home directory (passwd says '${GITEA_HOME:-<empty>}'); creating ${configured_default} and pointing the account at it."
+        mkdir -p -- "$configured_default"
+        chown "${GITEA_USER}:${GITEA_GROUP}" "$configured_default"
+        usermod --home "$configured_default" "$GITEA_USER"
+        GITEA_HOME="$configured_default"
+    fi
+
     case "$(cut -d: -f7 <<<"$entry")" in
         */nologin|*/false|*/git-shell)
             warn "User '${GITEA_USER}' has a non-interactive login shell, so SSH pushes will fail. Fix: usermod -s /bin/bash ${GITEA_USER}"
@@ -420,6 +437,10 @@ START_SSH_SERVER = false
 SSH_DOMAIN = ${GITEA_DOMAIN}
 SSH_PORT = ${GITEA_SSH_PORT}
 SSH_CREATE_AUTHORIZED_KEYS_FILE = true
+; Show the SSH clone URL on a public repo's page to visitors who aren't
+; signed in (an anonymous key still can't push or read a private repo --
+; this only affects whether the URL itself is displayed).
+SSH_EXPOSE_ANONYMOUS = true
 LFS_START_SERVER = true
 LFS_JWT_SECRET = ${lfs_jwt_secret}
 
@@ -444,7 +465,10 @@ JWT_SECRET = ${oauth2_jwt_secret}
 
 [service]
 DISABLE_REGISTRATION = ${GITEA_DISABLE_REGISTRATION}
-REQUIRE_SIGNIN_VIEW = true
+; false (GitHub-style): public repos can be browsed and cloned over HTTP(S)
+; without signing in. Private repos still require auth either way -- this
+; only affects whether the sign-in wall covers public content too.
+REQUIRE_SIGNIN_VIEW = false
 DEFAULT_KEEP_EMAIL_PRIVATE = true
 DEFAULT_ALLOW_CREATE_ORGANIZATION = true
 
@@ -452,6 +476,9 @@ DEFAULT_ALLOW_CREATE_ORGANIZATION = true
 MODE = console
 LEVEL = info
 ROOT_PATH = ${GITEA_WORK_DIR}/log
+; Logs each SSH (git serv) connection -- who connected and which key/repo --
+; the SSH-side counterpart of the HTTP access log.
+ENABLE_SSH_LOG = true
 EOF
 }