tg-update.sh: Abort on missing dependencies

[topgit.git] / tg.sh

diff --git a/tg.sh b/tg.sh
index ae3dcda6446709183cf2f1032777f41655149a57..ee14e62860c2a34bda48aecdc7162128bf83fb48 100644 (file)
--- a/tg.sh
+++ b/tg.sh
@@ -21,7 +21,8 @@ die()
 setup_hook()
 {
        hook_call="\"\$(tg --hooks-path)\"/$1 \"\$@\""
-       if fgrep -q "$hook_call" "$git_dir/hooks/$1"; then
+       if [ -f "$git_dir/hooks/$1" ] &&
+          fgrep -q "$hook_call" "$git_dir/hooks/$1"; then
                # Another job well done!
                return
        fi
@@ -35,7 +36,7 @@ setup_hook()
        {
                echo "#!/bin/sh"
                echo "$hook_call"
-               cat "$git_dir/hooks/$1"
+               [ ! -s "$git_dir/hooks/$1" ] || cat "$git_dir/hooks/$1"
        } >"$git_dir/hooks/$1+"
        chmod a+x "$git_dir/hooks/$1+"
        mv "$git_dir/hooks/$1+" "$git_dir/hooks/$1"
@@ -76,7 +77,7 @@ measure_branch()
 # Whether B1 is a superset of B2.
 branch_contains()
 {
-       [ "$(git rev-list ^"$1" "$2" | wc -l)" -eq 0 ]
+       [ -z "$(git rev-list ^"$1" "$2")" ]
 }
 
 # needs_update NAME [BRANCHPATH...]
@@ -84,11 +85,19 @@ branch_contains()
 # to the branch (e.g. B_DIRTY B1 B2 NAME), one path per line,
 # inner paths first. Innermost name can be ':' if the head is
 # not in sync with the base.
+# If needs_update() hits missing dependencies, it will append
+# them to space-separated $missing_deps list and skip them.
 needs_update()
 {
        {
        git cat-file blob "$1:.topdeps" 2>/dev/null |
                while read _dep; do
+                       if !git rev-parse --verify "$_dep" >/dev/null 2>&1; then
+                               # All hope is lost
+                               missing_deps="$missing_deps $_dep"
+                               continue
+                       fi
+
                        _dep_is_tgish=1
                        git rev-parse --verify "refs/top-bases/$_dep" >/dev/null 2>&1 ||
                                _dep_is_tgish=
@@ -112,6 +121,12 @@ needs_update()
        } || : # $1 is not tracked by TopGit anymore
 }
 
+# branch_empty NAME
+branch_empty()
+{
+       [ -z "$(git diff-tree "refs/top-bases/$1" "$1" | fgrep -v "     .top")" ]
+}
+
 # switch_to_base NAME [SEED]
 switch_to_base()
 {
@@ -148,7 +163,7 @@ shift
 
 case "$cmd" in
 help)
-       echo "TopGit - A different patch queue manager"
+       echo "TopGit v0.1 - A different patch queue manager"
        echo "Usage: tg (create|delete|info|patch|summary|update|help) ..."
        exit 1;;
 create|delete|info|patch|summary|update)