depot_tools: Ensure Python is bootstrapped before reading python3_bin_reldir.txt

Bug: 1017812
Change-Id: I7013e5445ff5917fab813a54fed416d9770d2684
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1913269
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>

vpython

@@ -34,13 +34,20 @@ then
 fi
 
 
-MYPATH=$(dirname "${BASH_SOURCE[0]}")
+base_dir=$(dirname "$0")
 
-source "$MYPATH/cipd_bin_setup.sh"
+source "$base_dir/cipd_bin_setup.sh"
 cipd_bin_setup &> /dev/null
 
-base_dir=$(dirname "$0")
-PYTHON_BIN_RELDIR="$(cat $base_dir/python_bin_reldir.txt | xargs echo)"
-PATH="$PYTHON_BIN_RELDIR":"$PYTHON_BIN_RELDIR/Scripts":"$PATH"
+# If Python bootstrapping is not disabled, make sure Python has been
+# bootstrapped and add it to the front of PATH.
+if [[ $MINGW != 0 && $DEPOT_TOOLS_BOOTSTRAP_PYTHON3 != 0 ]]; then
+  if [[ ! -e $base_dir/python_bin_reldir.txt ]]; then
+    source "$base_dir/bootstrap_python3"
+    bootstrap_python3
+  fi
+  PYTHON_BIN_RELDIR="$base_dir/$(cat $base_dir/python_bin_reldir.txt | xargs echo)"
+  PATH="$PYTHON_BIN_RELDIR":"$PYTHON_BIN_RELDIR/Scripts":"$PATH"
+fi
 
-exec "$MYPATH/.cipd_bin/vpython" "$@"
+exec "$base_dir/.cipd_bin/vpython" "$@"

vpython3

@@ -34,13 +34,20 @@ then
 fi
 
 
-MYPATH=$(dirname "${BASH_SOURCE[0]}")
+base_dir=$(dirname "$0")
 
-source "$MYPATH/cipd_bin_setup.sh"
+source "$base_dir/cipd_bin_setup.sh"
 cipd_bin_setup &> /dev/null
 
-base_dir=$(dirname "$0")
-PYTHON3_BIN_RELDIR="$(cat $base_dir/python3_bin_reldir.txt | xargs echo)"
-PATH="$PYTHON3_BIN_RELDIR":"$PYTHON3_BIN_RELDIR/Scripts":"$PATH"
+# If Python bootstrapping is not disabled, make sure Python has been
+# bootstrapped and add it to the front of PATH.
+if [[ $MINGW != 0 && $DEPOT_TOOLS_BOOTSTRAP_PYTHON3 != 0 ]]; then
+  if [[ ! -e $base_dir/python3_bin_reldir.txt ]]; then
+    source "$base_dir/bootstrap_python3"
+    bootstrap_python3
+  fi
+  PYTHON3_BIN_RELDIR="$base_dir/$(cat $base_dir/python3_bin_reldir.txt | xargs echo)"
+  PATH="$PYTHON3_BIN_RELDIR":"$PYTHON3_BIN_RELDIR/Scripts":"$PATH"
+fi
 
-exec "$MYPATH/.cipd_bin/vpython3" "$@"
+exec "$base_dir/.cipd_bin/vpython3" "$@"