sdk-installer: support NTLM proxies

When Pacman needs to be told to use a proxy, it actually needs to use a
helper because Pacman's HTTP support has no clues about authentication:
the proxy might require NTLM (or other) authentication.

So let's ship with cURL, and fall back to using it with the `--anyauth`
option.

This fixes git-for-windows/git#309

Signed-off-by: Johannes Schindelin <[email protected]>

sdk-installer/release.sh

@@ -34,7 +34,7 @@ OPTS7="-m0=lzma -mx=9 -md=64M"
 TMPPACK=/tmp.7z
 SCRIPT_PATH="$(cd "$(dirname "$0")" && pwd)"
 
-mkdir -p "$FAKEROOTDIR" ||
+mkdir -p "$FAKEROOTDIR/usr/bin" "$FAKEROOTDIR/etc" ||
 die "Could not create fake root directory"
 
 sed -e "s|@@ARCH@@|$ARCH|g" \
@@ -44,17 +44,23 @@ sed -e "s|@@ARCH@@|$ARCH|g" \
 <"$SCRIPT_PATH"/setup-git-sdk.bat >"$FAKEROOTDIR"/setup-git-sdk.bat ||
 die "Could not generate setup script"
 
+cp /usr/bin/dash.exe "$FAKEROOTDIR/usr/bin/sh.exe" &&
+sed -e 's/^#\(XferCommand.*curl\).*/\1 --anyauth -C - -s -L -f %u >%o/' \
+	</etc/pacman.conf >"$FAKEROOTDIR/etc/pacman.conf.proxy" ||
+die "Could not copy extra files into fake root"
+
 fileList="$(cd / && echo \
 	etc/pacman.* \
-	usr/bin/gpg.exe \
 	usr/bin/pacman.exe \
-	$(ldd /usr/bin/gpg.exe |
-	  sed -n 's/.* \/\(usr\/bin\/.*\.dll\) .*/\1/p') \
-	usr/bin/msys-crypto-*.dll \
-	usr/bin/msys-ssl-*.dll \
+	usr/bin/curl.exe \
+	usr/bin/gpg.exe \
+	$(ldd /usr/bin/gpg.exe /usr/bin/curl.exe |
+	  sed -n 's/.* \/\(usr\/bin\/.*\.dll\) .*/\1/p' |
+	  sort |
+	  uniq) \
 	usr/ssl/certs/ca-bundle.crt \
 	var/lib/pacman)
-	$FAKEROOTDIR/setup-git-sdk.bat"
+	$FAKEROOTDIR/setup-git-sdk.bat $FAKEROOTDIR/etc $FAKEROOTDIR/usr"
 
 type 7za ||
 pacman -Sy --noconfirm p7zip ||

sdk-installer/setup-git-sdk.bat

@@ -35,6 +35,9 @@
 @IF NOT "%proxy%" == "" @(
 	@SET http_proxy=%proxy%
 	@SET https_proxy=%proxy%
+	@IF %counter% EQU 2 @(
+		@COPY "%cwd%"\etc\pacman.conf.proxy "%cwd%"\etc\pacman.conf
+	)
 )
 
 @REM update the Pacman package indices first, then force-install msys2-runtime