clone tool: fail instead of prompting, lowercase host, update only on 1

A missing or private https repo made git ask for a username through SSH_ASKPASS, which on this desktop is pinentry-qt: a login dialog popped up and the tool waited up to its 300 s timeout. SSH_ASKPASS is now unset and GIT_TERMINAL_PROMPT=0, so the clone fails in about 0.2 s with "terminal prompts disabled".

The host is lowercased before the map lookup, so GitHub.com finds GITHUB. update pulls only when it is 1, so a model passing 0 gets the question, not a pull.

test-clone.sh checks all three; the new checks fail on the previous script.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2 files changed, 14 insertions, 1 deletions

diff --git a/examples/tools/clone.sh b/examples/tools/clone.sh
index f08b932..2f9defc 100755
--- a/examples/tools/clone.sh
+++ b/examples/tools/clone.sh
@@ -23,6 +23,10 @@
 # clone instead. Check: test-clone.sh.
 
 set -uo pipefail
+# A missing or private repo must fail, not wait on a login: git falls back to
+# SSH_ASKPASS (a pinentry dialog on this desktop) and then the terminal.
+unset SSH_ASKPASS
+export GIT_TERMINAL_PROMPT=0
 
 url=${1:-}
 to=${2:-}
@@ -54,6 +58,7 @@ case "$url" in
         ;;
 esac
 host=${host%%:*}
+host=${host,,}
 path=${path%/}
 repo=${path##*/}
 repo=${repo%.git}
@@ -106,7 +111,7 @@ target=$root/$folder/$name
 # Never clone over an existing folder, and never under another name: offer an
 # update instead. ff-only so a diverged clone is reported, not merged.
 if [ -e "$target" ]; then
-    if [ -n "$update" ]; then
+    if [ "$update" = 1 ]; then
         out=$(git -C "$target" pull --ff-only 2>&1) && {
             echo "updated $target: $(tail -1 <<< "$out")"
             exit 0
diff --git a/examples/tools/test-clone.sh b/examples/tools/test-clone.sh
index ff45b6d..02879a2 100755
--- a/examples/tools/test-clone.sh
+++ b/examples/tools/test-clone.sh
@@ -32,6 +32,7 @@ mkdir -p "$tmp/bin"
 cat > "$tmp/bin/git" <<'EOF'
 #!/bin/bash
 printf '%s\n' "$*" >> "$GIT_LOG"
+printf 'prompt=%s askpass=%s\n' "${GIT_TERMINAL_PROMPT-}" "${SSH_ASKPASS-unset}" >> "$GIT_LOG"
 [ "$1" = clone ] && mkdir -p "${@: -1}"
 exit 0
 EOF
@@ -51,8 +52,13 @@ out=$("$here/clone.sh" https://github.com/a/b.git)
 check "github clone" "$out" "cloned https://github.com/a/b.git into $CLONE_ROOT/GITHUB/a-b"
 check "seed" "$(cat "$CLONE_MAP")" \
     "$(printf '%s\t%s\n' github.com GITHUB gitlab.com GITLAB forge.slackware.nl FORGE)"
+check "no prompts" "$(count 'prompt=0 askpass=unset')" "1"
 check "clone argv" "$(count "clone -- https://github.com/a/b.git $CLONE_ROOT/GITHUB/a-b")" "1"
 
+# Host case does not matter.
+out=$("$here/clone.sh" https://GitHub.com/a/up)
+check "host case" "$out" "cloned https://GitHub.com/a/up into $CLONE_ROOT/GITHUB/a-up"
+
 # Trailing slash and .git are not part of the repo name.
 out=$("$here/clone.sh" https://gitlab.com/a/c.git/)
 check "gitlab repo" "$out" "cloned https://gitlab.com/a/c.git into $CLONE_ROOT/GITLAB/a-c"
@@ -96,6 +102,8 @@ check "no duplicate map line" "$(mapcount 'codeberg.org')" "1"
 out=$("$here/clone.sh" https://github.com/a/b.git)
 contains "already asks" "$out" "already cloned at $CLONE_ROOT/GITHUB/a-b"
 check "already no reclone" "$(count "clone -- https://github.com/a/b.git")" "1"
+out=$("$here/clone.sh" https://github.com/a/b.git "" 0)
+contains "update=0 asks" "$out" "already cloned"
 out=$("$here/clone.sh" https://github.com/a/b.git "" 1)
 contains "update says" "$out" "updated $CLONE_ROOT/GITHUB/a-b"
 check "update argv" "$(count "-C $CLONE_ROOT/GITHUB/a-b pull --ff-only")" "1"