Fix spurious failure of the check/all script (quantumlib#6611)

- Avoid passing an empty string argument to `check/format-incremental`
  when invoked from `check/all`

- Improve validation of the git-revision argument in check scripts by
  allowing git tags that resolve to a commit

- Fix invalid use of `?` in egrep pattern

- Make check/mypy pass in the dev.env.txt virtual environment

check/all

@@ -38,20 +38,20 @@ cd "${topdir}" || exit $?
 errors=()
 
 # Parse arguments.
-apply_arg=""
+apply_arg=( )
 only_changed=0
-rev=""
+rev=( )
 for arg in "$@"; do
     if [[ "${arg}" == "--only-changed-files" ]]; then
         only_changed=1
     elif [[ "${arg}" == "--apply-format-changes" ]]; then
-        apply_arg="--apply"
-    elif [ -z "${rev}" ]; then
+        apply_arg=( "--apply" )
+    elif [[ "${#rev[@]}" == 0 ]]; then
         if [ "$(git cat-file -t "${arg}" 2> /dev/null)" != "commit" ]; then
             echo -e "\033[31mNo revision '${arg}'.\033[0m" >&2
             exit 1
         fi
-        rev="${arg}"
+        rev=( "${arg}" )
     else
         echo -e "\033[31mInvalid arguments. Expected [BASE_REVISION] [--only-changed-files] [--apply-format].\033[0m" >&2
         exit 1
@@ -73,15 +73,16 @@ echo "Running mypy"
 check/mypy || errors+=( "check/mypy failed" )
 
 echo "Running incremental format"
-check/format-incremental "${rev}" "${apply_arg}" || errors+=( "check/format-incremental failed" )
+check/format-incremental "${rev[@]}" "${apply_arg[@]}" ||
+    errors+=( "check/format-incremental failed" )
 
 if [ ${only_changed} -ne 0 ]; then
     echo "Running pytest and incremental coverage on changed files"
-    check/pytest-changed-files-and-incremental-coverage "${rev}" ||
+    check/pytest-changed-files-and-incremental-coverage "${rev[@]}" ||
          errors+=( "check/pytest-changed-files-and-incremental-coverage failed" )
 else
     echo "Running pytest and incremental coverage"
-    check/pytest-and-incremental-coverage "${rev}" ||
+    check/pytest-and-incremental-coverage "${rev[@]}" ||
          errors+=( "check/pytest-and-incremental-coverage failed" )
 fi
 

check/build-changed-protos

@@ -32,7 +32,7 @@ cd "${topdir}" || exit $?
 
 # Figure out which revision to compare against.
 if [ -n "$1" ] && [[ $1 != -* ]]; then
-    if [ "$(git cat-file -t "$1" 2> /dev/null)" != "commit" ]; then
+    if ! git rev-parse --verify --quiet --no-revs "$1^{commit}"; then
         echo -e "\033[31mNo revision '$1'.\033[0m" >&2
         exit 1
     fi
@@ -62,7 +62,7 @@ dev_tools/build-protos.sh
 
 # Filenames with spaces will be ugly (each part will be listed separately)
 # but the error logic will still work.
-uncommitted=$(git status --porcelain 2>/dev/null | grep -E "^?? cirq-google" | cut -d " " -f 3)
+uncommitted=$(git status --porcelain 2>/dev/null | grep -E "^[?][?] cirq-google" | cut -d " " -f 3)
 
 if [[ -n "$uncommitted" ]]; then
     echo -e "\033[31mERROR: Uncommitted generated files found! Please generate and commit these files using dev_tools/build-protos.sh:\033[0m"

check/format-incremental

@@ -46,7 +46,7 @@ for arg in "$@"; do
     elif [[ "${arg}" == "--all" ]]; then
         only_changed=0
     elif [ -z "${rev}" ]; then
-        if [ "$(git cat-file -t "${arg}" 2> /dev/null)" != "commit" ]; then
+        if ! git rev-parse --verify --quiet --no-revs "${arg}^{commit}"; then
             echo -e "\033[31mNo revision '${arg}'.\033[0m" >&2
             exit 1
         fi

check/pylint-changed-files

@@ -31,7 +31,7 @@ cd "${topdir}" || exit $?
 
 # Figure out which revision to compare against.
 if [ -n "$1" ] && [[ $1 != -* ]]; then
-    if [ "$(git cat-file -t "$1" 2> /dev/null)" != "commit" ]; then
+    if ! git rev-parse --verify --quiet --no-revs "$1^{commit}"; then
         echo -e "\033[31mNo revision '$1'.\033[0m" >&2
         exit 1
     fi

check/pytest-and-incremental-coverage

@@ -45,7 +45,7 @@ done
 
 # Figure out which revision to compare against.
 if [ -n "${BASEREV}" ]; then
-    if [ "$(git cat-file -t "${BASEREV}" 2> /dev/null)" != "commit" ]; then
+    if ! git rev-parse --verify --quiet --no-revs "${BASEREV}^{commit}"; then
         echo -e "\033[31mNo revision '${BASEREV}'.\033[0m" >&2
         exit 1
     fi

check/pytest-changed-files

@@ -35,7 +35,7 @@ cd "${topdir}" || exit $?
 # Figure out which branch to compare against.
 rest=( "$@" )
 if [ -n "$1" ] && [[ $1 != -* ]]; then
-    if [ "$(git cat-file -t "$1" 2> /dev/null)" != "commit" ]; then
+    if ! git rev-parse --verify --quiet --no-revs "$1^{commit}"; then
         echo -e "\033[31mNo revision '$1'.\033[0m" >&2
         exit 1
     fi

check/pytest-changed-files-and-incremental-coverage

@@ -34,7 +34,7 @@ cd "$(git rev-parse --show-toplevel)" || exit 1
 
 # Figure out which revision to compare against.
 if [ -n "$1" ] && [[ $1 != -* ]]; then
-    if [ "$(git cat-file -t "$1" 2> /dev/null)" != "commit" ]; then
+    if ! git rev-parse --verify --quiet --no-revs "$1^{commit}"; then
         echo -e "\033[31mNo revision '$1'.\033[0m" >&2
         exit 1
     fi

cirq-core/cirq/contrib/svg/svg_test.py

@@ -1,5 +1,5 @@
 # pylint: disable=wrong-or-nonexistent-copyright-notice
-import IPython.display  # type: ignore
+import IPython.display
 import numpy as np
 import pytest
 

dev_tools/conf/mypy.ini

@@ -17,7 +17,7 @@ follow_imports = silent
 ignore_missing_imports = true
 
 # Non-Google
-[mypy-sympy.*,matplotlib.*,proto.*,pandas.*,scipy.*,freezegun.*,mpl_toolkits.*,networkx.*,ply.*,astroid.*,pytest.*,_pytest.*,pylint.*,setuptools.*,qiskit.*,quimb.*,pylatex.*,filelock.*,sortedcontainers.*,tqdm.*,ruamel.*,absl.*,tensorflow_docs.*,ipywidgets.*, cachetools.*]
+[mypy-IPython.*,sympy.*,matplotlib.*,proto.*,pandas.*,scipy.*,freezegun.*,mpl_toolkits.*,networkx.*,ply.*,astroid.*,pytest.*,_pytest.*,pylint.*,setuptools.*,qiskit.*,quimb.*,pylatex.*,filelock.*,sortedcontainers.*,tqdm.*,ruamel.*,absl.*,tensorflow_docs.*,ipywidgets.*,cachetools.*]
 follow_imports = silent
 ignore_missing_imports = true