gitlab-ci: More intelligent detection of locale availability

Previously ci.sh would unconditionally use C.UTF-8. However, this fails
on Centos 7, which appears not to provide this locale. Now we first try
C.UTF-8, then try en_US.UTF-8, then fail.

Works around #18607.

1 files changed, 26 insertions, 3 deletions

diff --git a/.gitlab/ci.sh b/.gitlab/ci.sh
index dcaa41b089..f031c5f03f 100755
--- a/.gitlab/ci.sh
+++ b/.gitlab/ci.sh
@@ -26,9 +26,6 @@ LT_CYAN="1;36"
 WHITE="1;37"
 LT_GRAY="0;37"
 
-export LANG=C.UTF-8
-export LC_ALL=C.UTF-8
-
 # GitLab Pipelines log section delimiters
 # https://gitlab.com/gitlab-org/gitlab-foss/issues/14664
 start_section() {
@@ -60,6 +57,30 @@ function run() {
 
 TOP="$(pwd)"
 
+function setup_locale() {
+  # BSD grep terminates early with -q, consequently locale -a will get a
+  # SIGPIPE and the pipeline will fail with pipefail.
+  shopt -o -u pipefail
+  if locale -a | grep -q C.UTF-8; then
+    # Debian
+    export LANG=C.UTF-8
+  elif locale -a | grep -q C.utf8; then
+    # Fedora calls it this
+    export LANG=C.utf8
+  elif locale -a | grep -q en_US.UTF-8; then
+    # Centos doesn't have C.UTF-8
+    export LANG=en_US.UTF-8
+  else
+    error "Failed to find usable locale"
+    info "Available locales:"
+    locale -a
+    fail "No usable locale, aborting..."
+  fi
+  info "Using locale $LANG..."
+  export LC_ALL=$LANG
+  shopt -o -s pipefail
+}
+
 function mingw_init() {
   case "$MSYSTEM" in
     MINGW32)
@@ -423,6 +444,8 @@ function shell() {
   run $cmd
 }
 
+setup_locale
+
 # Determine Cabal data directory
 case "$(uname)" in
   MSYS_*|MINGW*) exe=".exe"; cabal_dir="$APPDATA/cabal" ;;