linter: disable ShellCheck for hg

Summary:
The ShellCheck linter:
- Conflict with hg check-code. ex. on "$()" vs "``".
- Over picky. ex. SC2148 should only run on scripts with `x` bit.

Therefore disable it for scm/hg.

Reviewed By: zertosh

Differential Revision: D6887739

fbshipit-source-id: 9447a4582ab5d2798a382d9dc715eb319d4255c0

tests/helpers-testrepo.sh

@@ -1,4 +1,3 @@
-# shellcheck disable=SC2148
 # In most cases, the mercurial repository can be read by the bundled hg, but
 # that isn't always true because third-party extensions may change the store
 # format, for example. In which case, the system hg installation is used.
@@ -45,7 +44,6 @@ EOF
 
 # Use the system hg command if the bundled hg can't read the repository with
 # no warning nor error.
-# shellcheck disable=SC2006
 if [ -n "`hg id --cwd "$TESTDIR/.." 2>&1 >/dev/null`" ]; then
     alias testrepohg=syshg
     alias testrepohgenv=syshgenv

tests/helpers-usechg.sh

@@ -1,9 +1,7 @@
-# shellcheck disable=SC2148
 # Make the test use chg if possible
 
 if [ -x "$RUNTESTDIR/../contrib/chg/chg" ] && [ -z "$CHGHG" ]; then
   CHGHG="${HG:-hg}"
   export CHGHG
-  # shellcheck disable=SC2139
   alias hg="${CHG:-chg}"
 fi