@@ -118,6 +118,10 @@ class FetcherBase {
       // we need the actual things, not just the lockfile
       '--no-package-lock-only',
       '--no-dry-run',
+      // override npm_config_global from the parent process: this inner
+      // `npm install` is preparing deps inside a tmp git clone, and it
+      // must reify into that clone's cwd, never the outer global prefix.
+      '--global=false',
     ]
   }
 
 
@@ -48,6 +48,7 @@ Array [
   "--include=optional",
   "--no-package-lock-only",
   "--no-dry-run",
+  "--global=false",
 ]
 `
 
@@ -66,6 +67,7 @@ Array [
   "--include=optional",
   "--no-package-lock-only",
   "--no-dry-run",
+  "--global=false",
 ]
 `
 
 
@@ -770,6 +770,14 @@ t.test('handle it when prepared git deps depend on each other', { skip: isWindow
         noPrepare: [g.resolved],
         cwd: cwdRegex,
       })
+      // the inner `npm install` spawned by pacote to prepare a git clone
+      // must always run with --global=false so it does not honor an
+      // inherited npm_config_global=true and reify into the outer global
+      // prefix.
+      t.ok(
+        log.argv.includes('--global=false'),
+        'inner npm install is invoked with --global=false'
+      )
       // our rudimentary package manager dumps the deps into the pkg root
       // but it doesn't get installed once the loop is detected.
       const base = basename(local)
Original file line number	Diff line number	Diff line change
`@@ -118,6 +118,10 @@ class FetcherBase {`
`118`	`118`	`// we need the actual things, not just the lockfile`
`119`	`119`	`'--no-package-lock-only',`
`120`	`120`	`'--no-dry-run',`
	`121`	`+ // override npm_config_global from the parent process: this inner`
	`122`	+ // `npm install` is preparing deps inside a tmp git clone, and it
	`123`	`+ // must reify into that clone's cwd, never the outer global prefix.`
	`124`	`+ '--global=false',`
`121`	`125`	`]`
`122`	`126`	`}`
`123`	`127`
Original file line number	Diff line number	Diff line change
`@@ -48,6 +48,7 @@ Array [`
`48`	`48`	`"--include=optional",`
`49`	`49`	`"--no-package-lock-only",`
`50`	`50`	`"--no-dry-run",`
	`51`	`+ "--global=false",`
`51`	`52`	`]`
`52`	`53`	`
`53`	`54`
`@@ -66,6 +67,7 @@ Array [`
`66`	`67`	`"--include=optional",`
`67`	`68`	`"--no-package-lock-only",`
`68`	`69`	`"--no-dry-run",`
	`70`	`+ "--global=false",`
`69`	`71`	`]`
`70`	`72`	`
`71`	`73`