## Generally have fun
# Don't do anything on non-topgit branch
-git rev-parse --verify "$(git symbolic-ref HEAD | sed 's/heads/top-bases/')" >/dev/null 2>&1 ||
- exit 0
+if head_=$(git symbolic-ref -q HEAD); then
+ case "$head_" in
+ refs/heads/*)
+ head_="${head_#refs/heads/}"
+ git rev-parse -q --verify "refs/top-bases/$head_" >/dev/null || exit 0;;
+ *)
+ exit 0;;
+ esac
-[ -s "$root_dir/.topdeps" ] ||
- die ".topdeps is missing"
-[ -s "$root_dir/.topmsg" ] ||
- die ".topmsg is missing"
+else
+ exit 0;
+fi
-# TODO: Verify .topdeps for valid branch names and against cycles
+check_topfile()
+{
+ local tree file ls_line type size
+ tree=$1
+ file=$2
+
+ ls_line="$(git ls-tree --long "$tree" "$file")" ||
+ die "Can't ls tree for $file"
+
+ [ -n "$ls_line" ] ||
+ die "$file is missing"
+
+ # check for type and size
+ set -- $ls_line
+ type=$2
+ size=$4
+
+ # check file is of type blob (file)
+ [ "x$type" = "xblob" ] ||
+ die "$file is not a file"
+
+ # check for positive size
+ [ "$size" -gt 0 ] ||
+ die "$file has empty size"
+}
+
+tree=$(git write-tree) ||
+ die "Can't write tree"
+
+check_topfile "$tree" ".topdeps"
+check_topfile "$tree" ".topmsg"
+
+check_cycle_name()
+{
+ [ "$head_" != "$_dep" ] ||
+ die "TopGit dependencies form a cycle: perpetrator is $_name"
+}
+
+# we only need to check newly added deps and for these if a path exists to the
+# current HEAD
+git diff --cached "$root_dir/.topdeps" |
+ awk '
+BEGIN { in_hunk = 0; }
+/^@@ / { in_hunk = 1; }
+/^\+/ { if (in_hunk == 1) printf("%s\n", substr($0, 2)); }
+/^[^@ +-]/ { in_hunk = 0; }
+' |
+ while read newly_added; do
+ ref_exists "$newly_added" ||
+ die "Invalid branch as dependent: $newly_added"
+
+ # check for self as dep
+ [ "$head_" != "$newly_added" ] ||
+ die "Can't have myself as dep"
+
+ # deps can be non-tgish but we can't run recurse_deps() on them
+ ref_exists "refs/top-bases/$newly_added" ||
+ continue
+
+ # recurse_deps uses dfs but takes the .topdeps from the tree,
+ # therefore no endless loop in the cycle-check
+ no_remotes=1 recurse_deps check_cycle_name "$newly_added"
+ done
+
+# check for repetitions of deps
+depdir="$(get_temp tg-depdir -d)" ||
+ die "Can't check for multiple occurrences of deps"
+cat_file "$head_:.topdeps" -i |
+ while read dep; do
+ [ ! -d "$depdir/$dep" ] ||
+ die "Multiple occurrences of the same dep: $dep"
+ mkdir -p "$depdir/$dep" ||
+ die "Can't check for multiple occurrences of deps"
+ done