manually add git as a dependency to the .deb

Summary:
For the `.deb`, we try to create the `Depends:` line by running
`dpkg-shlibdeps` on the `hg` executable, but this doesn't catch
the fact that we need to be able to shell out to `git`. This diff updates
the logic in the `Makefile` to add `git` to `Depends:` as a special case.

Reviewed By: DurhamG

Differential Revision: D39162642

fbshipit-source-id: 64c7decf91f241fe9fd81dbfd51a0399becb0237

Author: bolinfest

eden/scm/Makefile

@@ -111,13 +111,20 @@ deb:
 # commands to work with Make inline.
 	./packaging/debian/build_deb.sh
 
+# Values of GIT_DEB_DEP below are based on running the following on "pristine"
+# Docker containers for the various versions of Ubuntu:
+#
+# apt update -y
+# apt install -y git
+# apt list --installed | grep -E '^git/'
+
 deb-ubuntu-20.04:
 	# For Ubuntu 20.04, target Python 3.8.
-	PY_VERSION=38 make deb
+	PY_VERSION=38 GIT_DEB_DEP="git (>= 1:2.25.1)" make deb
 
 deb-ubuntu-22.04:
 	# For Ubuntu 22.04, target Python 3.10.
-	PY_VERSION=310 make deb
+	PY_VERSION=310 GIT_DEB_DEP="git (>= 1:2.34.1)" make deb
 
 rpm:
 	rpmbuild \

eden/scm/packaging/debian/build_deb.sh

@@ -12,6 +12,9 @@ mkdir -p install/debian
 cp packaging/debian/control install/debian
 cd install
 DEB_DEPS=$(dpkg-shlibdeps -O -e usr/local/bin/*)
+# dpkg-shlibdeps does not know about the runtime dependency on Git,
+# so it must be added explicitly.
+DEB_DEPS="${DEB_DEPS}, ${GIT_DEB_DEP}"
 cd ..
 
 # In contrast to dpkg-shlibdeps, dpkg-deb requires the file to be named