Allow specifying shell for running scriptlets

Some distributions insist on using bash specific commands in their
install scripts under the assumption that "sh" is a symlink to bash.
This can causes issues if (e.g.) their users what to change sh to
point at another shell, such as dash, that does not support these
features. Add a configure option to explicitly set the shell being
used to run install scripts.

Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

2 files changed, 10 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index 45e0111a..a88e5514 100644
--- a/configure.ac
+++ b/configure.ac
@@ -89,6 +89,12 @@ AC_ARG_WITH(buildscript,
 	AS_HELP_STRING([--with-buildscript=name], [set the build script name used by makepkg]),
 	[BUILDSCRIPT=$withval], [BUILDSCRIPT=PKGBUILD])
 
+# Help line for changing shell used to run install scriptlets
+AC_ARG_WITH(scriptlet-shell,
+	AS_HELP_STRING([--with-scriptlet-shell=shell],
+		[set the shell used to run install scriptlets]),
+	[SCRIPTLET_SHELL=$withval], [SCRIPTLET_SHELL=sh])
+
 # Help line for using OpenSSL
 AC_ARG_WITH(openssl,
 	AS_HELP_STRING([--with-openssl], [use OpenSSL crypto implementations instead of internal routines]),
@@ -338,6 +344,9 @@ AC_DEFINE_UNQUOTED([SRCEXT], "$SRCEXT", [The file extension used by pacman sourc
 # Set makepkg build script name
 AC_SUBST(BUILDSCRIPT)
 AC_DEFINE_UNQUOTED([BUILDSCRIPT], "$BUILDSCRIPT", [The build script name used by makepkg])
+# Set shell used by install scriptlets
+AC_SUBST(SCRIPTLET_SHELL)
+AC_DEFINE_UNQUOTED([SCRIPTLET_SHELL], "$SCRIPTLET_SHELL", [The shell used to run install scriptlets])
 
 # Configuration files
 AC_CONFIG_FILES([
diff --git a/lib/libalpm/trans.c b/lib/libalpm/trans.c
index 5ceaaa70..dc75f577 100644
--- a/lib/libalpm/trans.c
+++ b/lib/libalpm/trans.c
@@ -277,7 +277,7 @@ int _alpm_runscriptlet(alpm_handle_t *handle, const char *filepath,
 		const char *script, const char *ver, const char *oldver, int is_archive)
 {
 	char cmdline[PATH_MAX];
-	char *argv[] = { "sh", "-c", cmdline, NULL };
+	char *argv[] = { SCRIPTLET_SHELL, "-c", cmdline, NULL };
 	char *tmpdir, *scriptfn = NULL, *scriptpath;
 	int retval = 0;
 	size_t len;