Merge #14831: Scripts and tools: Use #!/usr/bin/env bash instead of #!/bin/bash.

688f665a5e526fda0fb797bf617412fe9cbe64fd Scripts and tools & Docs: Used #!/usr/bin/env bash instead of obsolete #!/bin/bash, added linting for .sh files shebang and updated the Developer Notes. (vim88)

Pull request description:

  As it was discussed in [#13510](https://github.com/bitcoin/bitcoin/pull/13510), it is better to use `#!/usr/bin/env bash` instead of `#!/bin/bash`.

Tree-SHA512: 25f71eb9a6a0cdc91568b5c6863205c5fe095f77a69e633503a2ac7805bd9013af8538e538c0c666ce96a28e3f43ce7a8df5f08d4ff007723bb588d85674f2da

5 files changed, 40 insertions, 2 deletions

diff --git a/contrib/qos/tc.sh b/contrib/qos/tc.sh
index 738ea70dbe..5f9b87d9b2 100644
--- a/contrib/qos/tc.sh
+++ b/contrib/qos/tc.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Copyright (c) 2017 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index bb477d4be0..42885ac1d4 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -28,6 +28,8 @@ Developer Notes
     - [Strings and formatting](#strings-and-formatting)
     - [Variable names](#variable-names)
     - [Threads and synchronization](#threads-and-synchronization)
+    - [Scripts](#scripts)
+        - [Shebang](#shebang)
     - [Source code organization](#source-code-organization)
     - [GUI](#gui)
     - [Subtrees](#subtrees)
@@ -602,6 +604,31 @@ TRY_LOCK(cs_vNodes, lockNodes);
 }
 ```
 
+Scripts
+--------------------------
+
+### Shebang
+
+- Use `#!/usr/bin/env bash` instead of obsolete `#!/bin/bash`.
+
+  - [*Rationale*](https://github.com/dylanaraps/pure-bash-bible#shebang):
+
+    `#!/bin/bash` assumes it is always installed to /bin/ which can cause issues;
+
+    `#!/usr/bin/env bash` searches the user's PATH to find the bash binary.
+
+  OK:
+
+```bash
+#!/usr/bin/env bash
+```
+
+  Wrong:
+
+```bash
+#!/bin/bash
+```
+
 Source code organization
 --------------------------
 
diff --git a/src/qt/res/movies/makespinner.sh b/src/qt/res/movies/makespinner.sh
index 76e36e4f31..f47c66e02c 100755
--- a/src/qt/res/movies/makespinner.sh
+++ b/src/qt/res/movies/makespinner.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+#
 # Copyright (c) 2014-2015 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
diff --git a/test/lint/lint-python-dead-code.sh b/test/lint/lint-python-dead-code.sh
index 3341f794f9..4561b0db30 100755
--- a/test/lint/lint-python-dead-code.sh
+++ b/test/lint/lint-python-dead-code.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Copyright (c) 2018 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
diff --git a/test/lint/lint-python-shebang.sh b/test/lint/lint-shebang.sh
index 4ff87f0bf7..fda22592d3 100755
--- a/test/lint/lint-python-shebang.sh
+++ b/test/lint/lint-shebang.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# Shebang must use python3 (not python or python2)
+# Assert expected shebang lines
 
 export LC_ALL=C
 EXIT_CODE=0
@@ -10,4 +10,11 @@ for PYTHON_FILE in $(git ls-files -- "*.py"); do
         EXIT_CODE=1
     fi
 done
+for SHELL_FILE in $(git ls-files -- "*.sh"); do
+    if [[ $(head -n 1 "${SHELL_FILE}") != "#!/usr/bin/env bash" &&
+          $(head -n 1 "${SHELL_FILE}") != "#!/bin/sh" ]]; then
+        echo "Missing expected shebang \"#!/usr/bin/env bash\" or \"#!/bin/sh\" in ${SHELL_FILE}"
+        EXIT_CODE=1
+    fi
+done
 exit ${EXIT_CODE}