Ignore comments in INSTALL files (FS#51916)

If a comment in an INSTALL file contains the name of a valid
INSTALL file function but the function itself is not present,
pacman tries to execute that function. That leads to an error.

Ignore comments in the grep function in libalpm/trans.c to
avoid such errors.

Signed-off-by: Michael Straube <straubem@gmx.de>
Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/libalpm/trans.c b/lib/libalpm/trans.c
index 60114882..7689079b 100644
--- a/lib/libalpm/trans.c
+++ b/lib/libalpm/trans.c
@@ -305,6 +305,7 @@ void _alpm_trans_free(alpm_trans_t *trans)
 static int grep(const char *fn, const char *needle)
 {
 	FILE *fp;
+	char *ptr;
 
 	if((fp = fopen(fn, "r")) == NULL) {
 		return 0;
@@ -314,6 +315,9 @@ static int grep(const char *fn, const char *needle)
 		if(safe_fgets(line, sizeof(line), fp) == NULL) {
 			continue;
 		}
+		if((ptr = strchr(line, '#')) != NULL) {
+			*ptr = '\0';
+		}
 		/* TODO: this will not work if the search string
 		 * ends up being split across line reads */
 		if(strstr(line, needle)) {