Rework source checking.

David Spencer reported on the ML that the current sbopkg
behavior of checking the MD5 only just after the download
breaks some (bad) applications, like Google Earth, which
don't change the source file name on version upgrades.

This patch puts an additional check for existing sources,
so to workaround this issue (at the expense of extra MD5
checks for all other good applications). Moreover, add an
option to retry the download, which comes handy with the
aforementioned bad applications since otherwise the user had
to start the build twice (the first time he sees a failed
MD5 check and has the option to delete the downloaded file,
and the second time the source gets downloaded again).

Signed-off-by: Mauro Giachero <mauro.giachero@gmail.com>

src/usr/sbin/sbopkg

@@ -2104,6 +2104,74 @@ get_source_names() {
     ls -A $SRCDIR | grep "^${SRCNAME##*/}"
 }
 
+check_source() {
+    # Check the source file for correctness.
+    # Parameters:
+    # - $1 = package name
+    # - $2 = expected MD5
+    # - $3 = source file name
+    # Returns 0 if the source is OK, 1 if the source should be (re)downloaded
+    # (this includes the cases where $3 is empty or refers to a nonexistent
+    # file) and 2 if the user asked to abort the build.
+
+    local PKG=$1
+    local MD5SUM="$2"
+    local SRCNAME="$3"
+    local MD5CHK ANS
+
+    # If there's no known source name, or if it doesn't exist, it has to be
+    # downloaded...
+    [[ -z $SRCNAME || ! -f $SRCDIR/$SRCNAME ]] && return 1
+
+    # Check MD5
+    echo "Checking MD5SUM for \"$SRCNAME\"..."
+    MD5CHK=$(md5sum "$SRCDIR/$SRCNAME" | cut -d' ' -f1)
+    if [[ $MD5CHK == $MD5SUM ]]; then
+        echo "OK"
+    else
+        echo >> $TMPSUMMARYLOG
+        echo "$PKG:" >> $TMPSUMMARYLOG
+        echo "MD5SUM check failed." | tee -a $TMPSUMMARYLOG
+        echo "Expected: $MD5SUM" | tee -a $TMPSUMMARYLOG
+        echo "Found:    $MD5CHK" | tee -a $TMPSUMMARYLOG
+        # Ask the user what to do with the bad source
+        while :; do
+            cat << EOF
+
+Do you want to use the downloaded $PKG source:
+$SRCNAME in $SRCDIR?
+
+You can choose among the following options:
+ - (Y)es, keep the source and continue;
+ - (N)o, delete the source and abort build;
+ - No, (d)ownload another copy and try again.
+Your choice?
+EOF
+            error_read ANS
+            case $ANS in
+                n* | N* )
+                    rm -f "$SRCDIR/$SRCNAME"
+                    echo "Source deleted." | tee -a $TMPSUMMARYLOG
+                    return 2
+                    ;;
+                y* | Y* )
+                    MD5SUM=$(tr / _ <<< "$MD5CHK")
+                    echo "Keeping the source and continuing." |
+                        tee -a $TMPSUMMARYLOG
+                    return 0
+                    ;;
+                d* | D* )
+                    echo "Downloading again." | tee -a $TMPSUMMARYLOG
+                    return 1
+                    ;;
+                * )
+                    echo "Unknown response."
+                    ;;
+            esac
+        done
+    fi
+}
+
 get_source() {
     # Check to see if the source tarball exists in the local cache directory.
     # If it does, make a symlink to the package directory in the local mirror.
@@ -2118,17 +2186,26 @@ get_source() {
     # 2 = failed, stop queue processing
 
     local INFO="$1"
+    local PKG=$(sed 's:\.info.*$::g' <<< $INFO)
     local BUILD_LOCK=$SBOPKGTMP/sbopkg_build.lck
     local DLDIR=$SBOPKGTMP/sbopkg-download
     local PIDLIST=$SBOPKGTMP/sbopkgpidlist
     local TMPSUMMARYLOG=$SBOPKGTMP/sbopkg-tmp-summarylog
-    local SRCNAME DL FAILURE ANS MD5CHK
+    local SRCNAME DL FAILURE ANS MD5CHK SOURCE_STATUS
     # Don't pollute the environment with the .info content...
     local PRGNAM VERSION HOMEPAGE DOWNLOAD MD5SUM MAINTAINER EMAIL APPROVED
 
+    . "$INFO"
     SRCNAME=$(get_source_names "$INFO")
-    if [[ -z $SRCNAME || ! -f $SRCDIR/$SRCNAME ]]; then
+
-        . "$INFO"
+    check_source $PKG $MD5SUM $SRCNAME
+    SOURCE_STATUS=$?
+    while [[ $SOURCE_STATUS != 0 ]] ; do
+        if [[ $SOURCE_STATUS == 2 ]]; then
+            FAILURE=download
+            break
+        fi
+
         mkdir -p $DLDIR
         cd $DLDIR
         wget $WGETFLAGS $DOWNLOAD >> $SBOPKGOUTPUT & echo "$!" >> \
@@ -2149,52 +2226,13 @@ get_source() {
         fi
         cd $SRCDIR
         rm -rf $DLDIR
-        # Check MD5SUM
-        if [[ ! $FAILURE ]]; then
-            echo "Checking MD5SUM for \"$SRCNAME\"..."
-            MD5CHK=$(md5sum "$SRCNAME" | cut -d' ' -f1)
-            if [[ $MD5CHK == $MD5SUM ]]; then
-                echo "OK"
-            else
-                echo >> $TMPSUMMARYLOG
-                echo "$PKG:" >> $TMPSUMMARYLOG
-                echo "MD5SUM check failed." | tee -a $TMPSUMMARYLOG
-                echo "Expected: $MD5SUM" | tee -a $TMPSUMMARYLOG
-                echo "Found:    $MD5CHK" | tee -a $TMPSUMMARYLOG
-                # Ask the user what to do with the bad source
-                while :; do
-                    cat << EOF
 
-Do you want to use the downloaded $PKG source:
+        if [[ $FAILURE ]]; then
-$SRCNAME in $SRCDIR?
+            break
-
-You can choose among the following options:
- - (Y)es, keep the source and continue;
- - (N)o, delete the source and abort build.
-Your choice?
-EOF
-                    error_read ANS
-                    case $ANS in
-                        n* | N* )
-                            rm -f "$SRCDIR/$SRCNAME"
-                            echo "Source deleted."
-                            FAILURE=md5sum
-                            break
-                            ;;
-                        y* | Y* )
-                            MD5SUM=$(tr / _ <<< "$MD5CHK")
-                            echo "Keeping the source and continuing." |
-                                tee -a $TMPSUMMARYLOG
-                            break
-                            ;;
-                        * )
-                            echo "Unknown response."
-                            ;;
-                    esac
-                done
-            fi
         fi
-    fi
+        check_source $PKG $MD5SUM $SRCNAME
+        SOURCE_STATUS=$?
+    done
 
     cd $REPO_DIR/$PKGPATH
     rm -f "$SRCNAME"