deploy: fix build-dir git calls, capture SHA, drop dead mkdir

deploy.sh cd'd into the mktemp build dir before calling git, so
`git archive HEAD` failed with 'not a git repository' and the whole
deploy aborted. Resolve REPO from the script location and pass -C to
every git call, and write the archive to an absolute path since -C also
makes --output relative to the repo.

The deploy marker also ran `git rev-parse` from the temp dir; because it
sat inside a command substitution, set -e did not catch it and
last-deploy.txt silently recorded an empty commit. Capture SHA up front.

Also drop `mkdir -p public/cv`, left over from when the CV was copied
into a directory that nothing reads.

1 files changed, 8 insertions, 3 deletions

diff --git a/deploy.sh b/deploy.sh
index 9daf85b..51159fe 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -6,11 +6,17 @@
 # Strict mode: a failed render exits BEFORE rsync --delete can touch the VPS.
 set -euo pipefail
 
+# Resolve the repo root from this script's location and capture the SHA up
+# front: the build runs inside a temp dir with no .git, so every later git
+# call must be pointed at $REPO explicitly.
+REPO="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
+SHA="$(git -C "$REPO" rev-parse --short HEAD)"
+
 # 1. Render into a fresh temp dir so a partial build never gets deployed
 BUILD_DIR="$(mktemp -d /tmp/homepage-local.XXXXXX)"
 trap 'rm -rf "$BUILD_DIR"' EXIT
 cd "$BUILD_DIR"
-git archive --format=tar --output=tree.tar HEAD
+git -C "$REPO" archive --format=tar --output="$BUILD_DIR/tree.tar" HEAD
 tar xf tree.tar
 rm tree.tar
 
@@ -31,7 +37,6 @@ find . -name "*.qmd" -not -path "./.*" -not -path "./public/*" | while read -r f
 done
 
 # 4. Add cv
-mkdir -p public/cv
 cp cv/index.pdf public/cv.pdf
 cp cv/index.txt public/cv.txt
 
@@ -45,7 +50,7 @@ cp -r assets/* public/assets/
 cp assets/public_key public/public_key.txt
 
 # 6. Deploy marker
-printf 'deployed %s commit %s\n' "$(date -u +%Y-%m-%dT%H:%M:%SZ)" "$(git rev-parse --short HEAD)" > public/last-deploy.txt
+printf 'deployed %s commit %s\n' "$(date -u +%Y-%m-%dT%H:%M:%SZ)" "$SHA" > public/last-deploy.txt
 
 echo "Pushing to vps"